JP2011005403A - Monitoring device for flocculation mixing tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device for a flocculation mixing tank always displaying the current sludge state on a monitoring window, causing no entangling of residue impairing visibility, and always allowing cleaning of the monitoring window without requiring power separately.SOLUTION: The monitoring device includes a tank body 12, an agitation shaft 18 disposed in the axial direction of the tank body 12, agitation blades 19 rotating around the agitation shaft 18 integrally therewith, the monitoring window 16 forming a part of a wall face of the tank body 12, and a wiper rotating around the agitation shaft 18 integrally therewith and in slide contact with an inner face of the monitoring window 16.

Description

  The present invention relates to a monitoring device for an agglomeration and mixing tank, and relates to a technology of an agglomeration and mixing tank that promotes the formation of agglomeration floc by mixing and stirring sludge and an aggregating agent.

  Conventionally, solid fine particles suspended in sewage are difficult to separate by ordinary physical methods such as precipitation and filtration. It is set as a lump. For example, Patent Document 1 discloses an agglomeration mixing tank in which this aggregation is performed. This is a system in which a stirring shaft is suspended inside the tank and a plurality of stirring blades are provided on the stirring shaft, and sludge and aggregating agent are mixed and stirred by the stirring blade in the tank to form a coagulation floc. .

  The flocculant is selected from an anionic polymer flocculant, a nonionic polymer flocculant, a cationic polymer flocculant, and an amphoteric polymer flocculant according to the properties of the sludge. Factors affecting the cohesiveness include the pH in the tank and the amount of suspended solids in the sludge, and neutralization is performed by the addition of a pH adjuster or a polymer coagulant having positive and negative charges.

  Since the coagulation action in the tank is not necessarily stable, it is necessary to monitor the state in the tank and adjust the addition amount of the coagulant, pH adjuster and the like. Therefore, in the conventional agglomeration and mixing tank, as shown in FIGS. 6 and 7, the monitoring window 2 is provided on the wall surface of the tank body 1, and the wiper device 3 is provided on the monitoring window 2. The wiper device 3 wipes dirt such as sludge and flocculant adhering to the surface. The wiper device 3 is composed of a handle 4 on the outside of the tank rotatably attached to the monitoring window 2 and a wiper 6 on the inside of the tank fixed to the handle rotating shaft 5. The wiper 6 is rotated by rotating the handle 4 and the monitoring window 2 is rotated. Wiping the inner surface of the.

Japanese Utility Model Publication No. 1-137800

  However, since the wiper device 3 described above needs to be provided at a position where the stirring action in the tank is not hindered, the monitoring window 2 is provided so as to protrude outward from the tank inner surface by a predetermined distance. A wiper 6 is arranged in a recess formed between the surfaces.

  When the hollow space becomes a dead space and the rotation speed of the stirring blade is small and the sludge flow rate in the tank is small, the sludge stays in the hollow space on the back side of the monitoring window 2. This staying sludge does not reflect the current state of sludge in the tank, and does not follow the current state of formation of aggregated floc in the tank in real time. For this reason, if the aggregation mixing tank is controlled based on the formation state of the aggregation floc visible through the monitoring window 2, the adjustment operation is not suitable for the actual situation, which may inhibit the formation of the aggregation floc.

  When the monitoring window 2 is cleaned, it is necessary to manually rotate the handle 4, and a residue is entangled with the wiper itself to obstruct visibility. In addition, since the rotary wiper device 3 has a rotating shaft that penetrates the monitoring window 2 on the front and back, it is necessary to provide a sealing function for the rotating shaft, which increases the manufacturing cost.

  The present invention solves the above-mentioned problems, and can always display the current state of sludge on the monitoring window, obstructs the field of view, does not entangle the residue, and constantly monitors without requiring separate power. It is an object of the present invention to provide a monitoring device for an agglomeration mixing tank capable of cleaning a window.

  In order to solve the above-mentioned problems, a monitoring device for an agglomeration and mixing tank according to the present invention comprises a tank body, a stirring shaft disposed inside the tank body, and a stirring blade that rotates about the axis of the stirring shaft integrally with the stirring shaft. In the agglomeration and mixing tank provided with a monitoring window forming a part of the wall surface of the tank body, and a wiper that rotates about the axis of the stirring shaft integrally with the stirring shaft and that is in sliding contact with the inner surface of the monitoring window, To do.

In the coagulation / mixing tank monitoring apparatus of the present invention, the wiper is provided at the tip of the stirring blade.
The agglomeration and mixing tank of the present invention comprises a tank body having a circular cross section, an agitation shaft disposed inside the tank body, an agitation blade that rotates about the axis of the agitation shaft integrally with the agitation shaft, and a wall surface of the tank body. A monitoring window forming a part, and a wiper that rotates integrally with the stirring shaft around the axis of the stirring shaft and that slides on the inner surface of the monitoring window are provided.

  As described above, according to the present invention, since the wiper rotates integrally with the stirring shaft, the wiper does not become a factor that hinders the stirring action in the tank. It is not necessary to protrude to the side and can be arranged as a part of the wall surface of the tank body. For this reason, for example, the monitoring window can be arranged inside the inner wall surface in parallel with the tangential direction of the circular inner wall surface of the tank body, or can be arranged curved along the inner wall surface of the tank body. Therefore, there is no dead space in which sludge stays on the inner side of the monitoring window, and the sludge always flows along the inner surface of the monitoring window, so that the current sludge state can always be represented on the monitoring window. Further, since the wiper rotates integrally with the stirring shaft, there is no fixing member inside the monitoring window, obstructs the field of view and does not cause tangling of the residue, so that a good field of view can always be secured. In addition, since the wiper rotates integrally with the stirring shaft, the monitoring window can always be cleaned without requiring separate power.

Cross-sectional view showing an agglomeration mixing tank in an embodiment of the present invention The perspective view which shows the stirring blade in the embodiment Longitudinal sectional view showing an agglomeration mixing tank in the same embodiment Front view showing an agglomeration mixing tank in the same embodiment Cross-sectional view showing an agglomeration mixing tank according to another embodiment of the present invention Front view showing a conventional flocculation mixing tank Enlarged view of the main part showing the monitoring window of a conventional coagulation mixing tank

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4, the tank body 12 of the agglomeration and mixing tank 11 has a circular cross section, and the axis of the tank body 12 is perpendicular to the installation floor. Connection ports 13 and 14 are provided on the upper side surface and the bottom surface of the tank body 12, and an inspection door 15 is provided on the side surface of the tank body 12 so that it can be opened and closed by a hinge 151 and can be closed watertight. The inspection door 15 is provided with a transparent monitoring window 16, and the monitoring window 16 is positioned inward of the inner wall surface in parallel with the tangential direction of the circular inner wall surface of the tank body 12. The monitoring window 16 is made of glass, resin, etc., and is formed as a flat plate in the present embodiment, but is formed by being curved along the inner wall surface of the tank body 12 and arranged as a part of the inner wall surface of the tank body 12. It is also possible to do.

  A motor 17 serving as a driving means is installed at the upper end of the tank body 12, and an agitation shaft 18 disposed in the axial direction of the tank body is connected to the motor 17 at one end of the tank body 12. It is set up. A plurality of stirring blades 19, here four stirring blades 19, are provided on the stirring shaft 18 radially from the axis of the stirring shaft 18 and perpendicular to the axis of the stirring shaft 18. In the present embodiment, the stirring blades 19 are provided in three stages in the vertical direction, but the number of stages and the shape of the stirring blades 19 are not limited to the present embodiment, and various forms can be adopted.

  A wiper 20 is attached to the tip of the upper stirring blade 19 corresponding to the monitoring window 16 in the axial direction of the stirring shaft 18. In this embodiment, the wiper 20 is provided on the two stirring blades 19. However, as shown in FIG. 5, the wiper 20 can be provided on one stirring blade 19 or provided on all the stirring blades 19. Is also possible.

  In the present embodiment, the wiper 20 has a plate shape and is a flexible elastic body made of a thin plate such as rubber, resin, metal, sponge, etc., but the wiper 20 is not limited to the plate shape, and can have any shape. A brush shape or the like is also possible. The wiper 20 is in sliding contact with the inner wall surface of the tank body 12 and the inner surface of the monitoring window 16, rotates integrally with the stirring shaft 18 around the axis of the stirring shaft 18, and slides on the inner surface of the monitoring window 16. Wiping. In the present embodiment, the wiper 20 is mounted on the stirring blade 19, but it is also possible to provide a support member or the like in the radial direction from the stirring shaft 18 and mount the wiper 20 on the support member.

  In the present invention, the cross-sectional shape of the tank body 12 is not limited to a circular shape, and may be an elliptical shape, a polygonal shape, or the like. It is also possible to provide a plurality of monitoring windows 16 and attach the wiper 20 to the tip of the stirring blade 19 corresponding to each monitoring window 16, and each of the plurality of stirring blades 19 corresponding to one large monitoring window 16. It is also possible to attach the wiper 20 to the tip of the.

  Hereinafter, the operation of the above-described configuration will be described. Sludge and a flocculant are put into the tank body 12 or a sludge containing a flocculant is put into the tank body 12. The agitation shaft 18 and the agitation blade 19 are rotationally driven by the motor 17 to agitate and mix the sludge and the aggregating agent inside the tank body 12 to form an agglomeration floc. In this agitation, the wiper 20 rotates integrally with the agitation shaft 18 so as not to hinder the agitation action in the tank. Therefore, the monitoring window 16 does not need to protrude outward from the wall surface of the tank body 12 as in the prior art, and can be arranged as a part of the wall surface of the tank body 12. That is, the monitoring window 16 can be arranged inside the inner wall surface in parallel with the tangential direction of the circular inner wall surface of the tank body 12, or can be arranged curved along the inner wall surface of the tank body 12. Therefore, there is no dead space where sludge stays on the inner side of the monitoring window 16, and the sludge always flows along the inner surface of the monitoring window 16. Therefore, the current sludge state, that is, the state of the aggregated flocs is always maintained. It can be represented in the monitoring window 16. In addition, since the wiper 20 rotates integrally with the stirring shaft 18, there is no fixing member inside the monitoring window 16, and the visual field is obstructed and no tangling of the residue occurs, so that a good visual field can always be secured. Further, since the wiper 20 rotates integrally with the stirring shaft 18, the monitoring window 16 can always be cleaned without the need for additional power.

DESCRIPTION OF SYMBOLS 11 Coagulation mixing tank 12 Tank body 13, 14 Connection port 15 Inspection door 151 Hinge 16 Monitoring window 17 Motor 18 Stirring shaft 19 Stirring blade 20 Wiper

Claims (3)

  A monitoring window that forms a part of the wall surface of the tank body in the agglomeration mixing tank comprising a tank body, a stirring shaft disposed inside the tank body, and a stirring blade that rotates about the axis of the stirring shaft integrally with the stirring shaft And a coagulant mixing tank monitoring device comprising a wiper that rotates integrally with the stirring shaft about the axis of the stirring shaft and that is in sliding contact with the inner surface of the monitoring window.   The apparatus for monitoring an agglomeration mixing tank according to claim 1, wherein the wiper is provided at the tip of the stirring blade.   A tank body having a circular cross section, an agitation shaft disposed inside the tank body, an agitation blade that rotates around the axis of the agitation shaft integrally with the agitation shaft, and a monitoring window that forms a part of the wall surface of the tank body; An agglomeration mixing tank characterized in that a wiper that rotates integrally with the stirring shaft about the axis of the stirring shaft and that slides on the inner surface of the monitoring window is provided.

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