JP4476988B2 - Scum pipe - Google Patents

Description

  The present invention relates to a scum pipe that removes scum floating on the water surface of a tank.

Conventionally, as a scum pipe, it is pivotally mounted in the vicinity of the water surface of the treated water at the edge of the tank, and has a slit-like hole portion formed along the longitudinal direction on its peripheral wall, at a constant angle. It is known that the scum is swallowed by rotating and repeating the protrusions and depressions of the hole with respect to the water surface on the flow direction side of the scum (for example, Patent Document 1).
JP 2002-66551 A

  Here, in the above scum pipe, since it can be swallowed only with respect to the water surface on the flow direction side of the scum, the scum on the opposite side cannot be removed. For this reason, the scum is attached to the scum pipe and the appearance is poor, and further, the quality of the treated water in the tank may be affected. In addition, when a mechanism that can be rotated to the opposite side is newly provided, there is a problem that the apparatus becomes complicated.

  The present invention has been made to solve such problems, and provides a scum pipe capable of swallowing scum from both the flow direction side of the scum and the opposite side thereof without complicating the apparatus. For the purpose.

  According to the scum pipe according to the present invention, the pipe supported to be rotatable around the central axis at the level of the water surface of the treated water accommodated in the tank, and the treated water provided in the peripheral wall of the pipe into the pipe. And a guide part for guiding, wherein the guide part extends on the peripheral wall of the pipe along the central axis and faces the first and second edges, and extends in the circumferential direction and faces each other. A hole provided so as to form the third and fourth edges, and an opening that shields a part of the hole and sucks treated water between the upper edge and the first edge. As described above, the scum on the water surface has a shielding plate extending from the second edge toward the inside of the pipe, and a partition wall for closing the space between the shielding plate and the third and fourth edges. In a normal state in which the suction is not performed, the second edge is submerged below the water surface, while the first edge and the shielding plate In the suction state in which the edge is located on the water surface and sucks the scum on the water surface, the first edge and the second edge are obtained by rotating the pipe around the central axis toward the first edge. The upper edge portion and the upper edge portion are both configured to be immersed below the water surface.

  In this scum pipe, the first edge side and the shielding plate side are rotated by rotating the pipe from the normal state where the scum is not sucked into the pipe by the first edge portion, the upper edge portion of the shielding plate and the partition wall. The scum is sucked into the pipe from both sides. Thereby, the scum can be swallowed from both sides of the scum pipe without complicating the apparatus.

  According to the scum pipe according to the present invention, the pipe supported to be rotatable around the central axis at the level of the water surface of the treated water accommodated in the tank, and the treated water provided in the peripheral wall of the pipe into the pipe. And a guide part for guiding, wherein the guide part extends on the peripheral wall of the pipe along the central axis and faces the first and second edges, and extends in the circumferential direction and faces each other. A hole provided so as to form the third and fourth edges, and an opening that shields a part of the hole and sucks treated water between the upper edge and the first edge. As described above, the shielding plate that extends from the second edge toward the inside of the pipe, and the storage that is provided from the second edge toward the outside of the pipe and stores treated water when submerged below the water surface. In a normal state where the scum on the water surface is not sucked, In the suction state in which the first edge and the upper edge of the shielding plate are located on the water surface and suck the scum on the water surface, the pipe is placed around the central axis on the first edge side. By rotating, the first edge portion is submerged below the water surface, and the storage portion is configured to supply the stored treated water into the pipe via the shielding plate.

  In this scum pipe, the pipe is rotated from the normal state where the scum is not sucked into the pipe by the first edge portion and the upper edge portion of the shielding plate, so that the scum is introduced from the first edge side into the pipe. While sucking, it can be set as the suction state which attracts | sucks the scum contained in the treated water also stored from the storage part side. Accordingly, the scum can be swallowed from both sides of the scum pipe without complicating the apparatus, and further, the swallowing amount from the storage portion side can be adjusted by changing the size of the storage portion.

  In the scum pipe according to the present invention, it is preferable that a plurality of guide portions are provided apart from each other in the central axis direction of the pipe. In this way, the strength of the scum pipe can be increased as compared with the case where one large guide portion is formed, and furthermore, the pipe can be prevented from expanding when the hole portion is formed, so that the manufacture is facilitated. In addition, the swallowing amount can be changed by changing the interval between the guide portions.

  According to the scum pipe according to the present invention, the scum can be swallowed from both the flow direction side of the scum and the opposite side without causing complication of the apparatus.

  Hereinafter, preferred embodiments of a scum pipe according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

[First embodiment]
FIG. 1 is a view showing a sludge scraping device provided with a scum pipe according to a first embodiment of the present invention. As shown in FIG. 1, the sludge scraping device 1 is disposed, for example, in a sedimentation basin or the like of a sewage treatment plant, and scrapes the sludge accumulated on the bottom 2b of the tank 2 toward the sludge pit 2a. The scum that floats on the water surface 3 is removed.

  The sludge scraping apparatus 1 includes a scraping base 10 that reciprocates in the longitudinal direction in a tank 2, a guide unit 20 that supports the scraping base 10 and guides the reciprocating motion, and a lower side of the scraping base 10 , A flight 30 that scrapes the sludge accumulated on the bottom 2b of the tank 2, a drive device 40 that reciprocates the cradle 10 in parallel with the bottom 2b of the tank 2, and the water surface 3. It is provided with a scum pipe 50 that removes the scum by rotating at.

  The tank 2 has a substantially rectangular cross section cut vertically along the longitudinal direction. The treated water 4 is supplied from the left side of FIG. 1 and the treated water 4 is supplied toward the longitudinal direction of the tank 2. A sludge pit 2a is provided at the bottom of the tank 2 on the sewage supply side, and the sludge collected at the bottom 2b is collected in the sludge pit 2a. Further, the scum that floats on the water surface 3 flows from the left side to the right side in FIG.

  The structure and operation of the scraper 10, the guide unit 20, the flight 30, and the driving device 40 are almost the same as those described in Japanese Patent Application Laid-Open No. 2003-181209.

  Specifically, the scraping base 10 is mainly connected to the driving direction member 13 via two parallel driving direction members 13 extending in the longitudinal direction and the coupling portion 13a to form the wheels of the scraping base 10. And a roller 11. The main roller 11 is accommodated and supported in the upper main guide rail 21 of the guide unit 20 installed on a pair of side walls parallel to the longitudinal direction of the tank 2, and its travel is guided to constitute a driving device 40. When the motor 41 rotates, the driving force is transmitted to the scraping base 10 via the chain 42, and the scraping base 10 reciprocates.

  When the cradle 10 moves forward, the flight 30 connected to the main roller support shaft of the cradle 10 so as to be able to swing around the axis causes sludge accumulated on the bottom 2b of the tank 2 to be sludge. Crush towards pit 2a. At this time, the auxiliary roller 32 protruding from the flight 30 toward the side wall of the tank 2 is swingably provided on the lower surface of the auxiliary guide rail 22 installed in the lower stage of the guide unit 20 and The lower guide flap 33 protruding so as to form an inclined surface of approximately 30 degrees below is pushed away against the spring force and moved forward. When the sub roller 32 passes under the opening 34, the motor 41 rotates in the reverse direction (counterclockwise in the drawing) and the scraper 10 starts to move backward, and the sub roller 32 follows the inclined surface of the lower guide flap 33. And enters the sub guide rail 22 through the opening 34. At this time, the flight 30 is rotated in the clockwise direction in the drawing to be inclined, and the flight 30 is separated from the bottom portion 2b without scraping the sludge that has been scraped back in the reverse direction (reverse direction). The scraper 10 is moved back. When the sub roller 32 approaches the opening 34 adjacent in the backward movement direction, the upper guide flap 35 is swingably installed on the lower surface of the sub guide rail 22 and extends upward against the spring force to open the opening. Pass over 34. When the sub-roller 32 passes over the opening 34, the motor 41 further rotates in the reverse direction and rotates clockwise in the figure, and the scraper 10 starts to move forward again, and the sub-roller 32 tilts the lower guide flap 33. It descends along the surface and is guided out of the auxiliary guide rail 22. Such a series of operations is repeated, and the sludge accumulated on the bottom 2b is carried to the sludge pit 2a.

  The scum pipe 50 is placed horizontally on the water surface 3 on the downstream side of the tank 2 over the entire width of the tank 2 in the short direction (about 5 m is common). The scum pipe 50 is rotated by a driving device (not shown) provided on the upper portion of the tank 2 to remove the scum on the water surface 3. Hereinafter, a detailed configuration of the scum pipe will be described with reference to FIGS. 2 and 3.

  FIG. 2 is a cross-sectional perspective view of the scum pipe 50 shown in FIG. 3 is a cross-sectional view of the scum pipe 50, where (a) shows a normal state where scum is not sucked and (b) shows a sucking state where scum is sucked. As shown in FIGS. 2 and 3, the scum pipe 50 includes a guide portion 52 that guides the treated water 4 into the pipe 51 on a peripheral wall 51 a of a cylindrical pipe 51 having an internal space, for example, an outer diameter of 318 mm. It is formed by providing a plurality of 51 spaced apart in the central axis direction. Note that more than half of the cross section of the scum pipe 50 is submerged below the water surface 3, and is supported by the side walls on both sides of the tank 2 so as to be rotatable around the central axis.

  The guide portion 52 extends along the central axis on the peripheral wall 51a of the pipe 51, and an edge portion (first edge portion) 53a, an edge portion (second edge portion) 53b, and the edge portion (second edge portion) 53b extend in the circumferential direction. A hole 53 is provided so as to form an opposing edge (third edge) 53c and edge (fourth edge) 53d, and a hole extends from the edge 53b toward the inside of the pipe 51. A shielding plate 54 that blocks a part of the portion 53 is formed, and the both ends of the shielding plate 54 in the longitudinal direction and the edges 53 c and 53 d are respectively closed by the partition walls 55. With such a configuration, an opening 56 for sucking the scum into the pipe 51 is formed between the edge 53 a and the upper edge 54 a of the shielding plate 54.

  As an example of typical dimensions of the scum pipe 50, as shown in FIG. 3A, the edge 53a is 140.5 mm (dimension A in the figure) from the center of the pipe when the scum is not sucked. The edge 53b is arranged at a position downstream of the scum flow at 45 ° (dimension B in the figure) counterclockwise from the center line L of the pipe cross section. Then, the hole 53 is formed. In addition, it is preferable that the dimension of the longitudinal direction of the hole part 53 shall be about 500 mm-1000 mm, and the space | interval of the hole parts 53 shall be about 50 mm.

  Further, the shielding plate 54 is provided so that the upper edge portion 54a is disposed at a position 90.5 mm (dimension C in the drawing) above the center of the pipe on the center line L. At this time, the horizontal width of the opening 56 is set to 75 mm (dimension D in the drawing).

  The scum pipe 50 is immersed in the treated water 4 so that the edge 53a arranged at the position as described above protrudes 60 mm upward from the water surface 3 and the upper edge 54a protrudes 10 mm upward from the water surface 3. At this time, while the edge 53b is submerged below the water surface 3, the edge 53a and the upper edge 54a of the shielding plate 54 are located on the water surface 3, so that the treated water 4 does not enter from the opening 56. The scum above 3 is not sucked.

  Next, when the suction state is set to suck the scum, as shown in FIG. 3B, the scum pipe 50 is rotated counterclockwise until the edge 53a is disposed 30 mm below the water surface 3. With this rotation, the upper edge portion 54a of the shielding plate 54 is disposed 14.8 mm below the water surface 3, and the edge portion 53b remains submerged in the treated water 4. Scum is sucked into the pipe 51 from both sides of the plate 54.

  By repeatedly rotating the scum pipe 50 and repeating the above-described normal state and suction state, the scum floating on the water surface 3 is swallowed and removed.

  As described above, in the first embodiment, the scum can be sucked from both the edge portion 53a side and the shielding plate 54 side by rotating the scum pipe 50 from the normal state. Thereby, the scum can be swallowed from both sides of the scum pipe 50 without complicating the apparatus.

  In addition, since a plurality of guide portions 52 are provided apart from each other in the central axis direction of the pipe 51, the strength of the scum pipe 50 can be increased as compared with the case where one large guide portion 52 is formed. Since the pipe 51 can be prevented from expanding when the hole 53 is formed, the manufacture is facilitated. In addition, the swallowing amount can be changed by changing the interval between the guide portions 52.

[Second Embodiment]
FIG. 4 is a cross-sectional perspective view showing a scum pipe 60 according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view of the scum pipe 60, where (a) shows a normal state where scum is not sucked, and (b) shows a sucking state where scum is sucked. The second embodiment is different from the first embodiment in that the shielding plate 54 extends to the inside of the pipe 51 and at the same time the shielding plate 57 extends to the outside. 57 is surrounded by wall surfaces provided in the vertical direction from the three edge portions except the upper edge portion 54a, whereby the storage portion 58 is formed. In the normal state, the reservoir 58 is submerged below the water surface 3 to store the treated water 4 and the scum. In the suction state, the shielding plates 54 and 57 are inclined to the inside of the pipe 51, and the stored treated water 4 is piped together with the scum. 51 is supplied. In addition, the wall surface which the storage part 58 faces corresponds to the partition 55 in 1st Embodiment.

  According to the second embodiment, the scum pipe 60 is rotated from the normal state in which the scum is not sucked into the pipe 51 by being blocked by the edge 53a and the upper edge 54a of the shielding plate 54, whereby the edge While sucking scum from the 53a side into the pipe 51, the scum can be sucked together with the treated water 4 stored also from the storage unit 58 side. Accordingly, the scum can be swallowed from both sides of the scum pipe 60 without complicating the apparatus, and further, the swallowing amount from the storage portion 58 side can be adjusted by changing the size of the storage portion 58. it can.

  As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment. For example, in the above embodiment, a driving device (not shown) provided on the upper part of the tank 2 is used to rotate the scum pipe, but the scum pipe 10 and the scum pipe are connected by a link mechanism, It is good also as a structure which rotates a scum pipe using the reciprocating motion of the scraping stand 10.

  The dimensions of the edge portion 53a of the scum pipe and the shielding plate 54 are the dimensions shown in the above embodiment as being particularly preferable, but other dimensions may be used.

It is a figure which shows the sludge scraping apparatus provided with the scum pipe which concerns on the 1st Embodiment of this invention. FIG. 2 is a cross-sectional perspective view of the scum pipe shown in FIG. 1. It is sectional drawing of the scum pipe shown by FIG. 1, (a) shows the normal state which does not attract | suck scum, (b) is a figure which shows the suction state which attracts | sucks a scum. It is a cross-sectional perspective view which shows the scum pipe which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the scum pipe shown by FIG. 4, (a) shows the normal state which does not attract | suck scum, (b) is a figure which shows the suction state which attracts | sucks a scum.

Explanation of symbols

  2 ... tank, 3 ... water surface, 4 ... treated water, 50, 60 ... scum pipe, 51 ... pipe, 51a ... peripheral wall, 52 ... guide part, 53 ... hole, 53a ... edge (first edge), 53b ... Edge (second edge), 53c ... Edge (third edge), 53d ... Edge (fourth edge), 54 ... Shielding plate, 54a ... Upper edge, 55 ... Partition 56 ... Opening, 58 ... Storage part.

Claims (3)

A pipe that is rotatably supported around the central axis at the level of the water surface of the treated water stored in the tank, and a guide portion that is provided on a peripheral wall of the pipe and guides the treated water into the pipe. A scum pipe comprising:
The guide part is
First and second edges that extend along the central axis and face each other, and third and fourth edges that extend in the circumferential direction and face each other are formed on the peripheral wall of the pipe. The hole,
The second edge portion faces the inside of the pipe so that a part of the hole portion is shielded and an upper edge portion forms an opening for sucking the treated water between the first edge portion and the upper edge portion. And a shielding plate extending,
A partition wall for closing between the shielding plate and the third and fourth edges,
In a normal state where the scum on the water surface is not sucked, the second edge portion is submerged below the water surface, while the first edge portion and the upper edge portion of the shielding plate are positioned on the water surface. And
In the suction state in which the scum on the water surface is sucked, the first edge, the second edge, and the pipe are rotated around the central axis toward the first edge. A scum pipe characterized in that all of the upper edge portions are configured to sunk under the water surface. A pipe that is rotatably supported around the central axis at the level of the water surface of the treated water stored in the tank, and a guide portion that is provided on a peripheral wall of the pipe and guides the treated water into the pipe. A scum pipe comprising:
The guide part is
First and second edges that extend along the central axis and face each other, and third and fourth edges that extend in the circumferential direction and face each other are formed on the peripheral wall of the pipe. The hole,
The second edge portion faces the inside of the pipe so that a part of the hole portion is shielded and an upper edge portion forms an opening for sucking the treated water between the first edge portion and the upper edge portion. And a shielding plate extending,
A storage portion that is provided from the second edge portion toward the outside of the pipe and stores the treated water when submerged below the water surface;
In a normal state in which the scum on the water surface is not sucked, the reservoir portion is submerged below the water surface, while the first edge portion and the upper edge portion of the shielding plate are located on the water surface,
In the suction state in which the scum on the water surface is sucked, the first edge is submerged below the water surface by rotating the pipe around the central axis toward the first edge, The storage section is configured to supply the stored treated water into the pipe through the shielding plate.   The scum pipe according to claim 1, wherein a plurality of the guide portions are provided apart from each other in the central axis direction of the pipe.

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