Sedimentation promotion device

Abstract

To provide a sedimentation promotion device capable of reliably and inexpensively suppressing damage to components caused by sloshing.SOLUTION: A sedimentation promotion device 2 comprises: an inclined plate holding assembly 3 that holds a plurality of sedimentation inclined plates 5 in parallel with each other; a suspension structure 8 for supporting the inclined plate holding assembly 3; a hanging tool 7 for suspending the inclined plate holding assembly 3 from the suspension structure 8; and a rotation support mechanism 15 disposed between a side wall of a sedimentation basin 1 and the inclined plate holding assembly 3. The rotation support mechanism 15 includes a rotating body 20 that contacts the side wall of the sedimentation basin 1, a rotating shaft 27 provided on the rotating body 20 and extending in a vertical direction, a bearing 21 supporting the rotating shaft 27, and a base 23 to which the bearing 21 is fixed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a settling promotion device for efficiently settling sediment contained in water to be treated in a settling tank, and more particularly to a settling promotion device with measures taken to prevent sloshing. [Background technology]

[0002] Sedimentation promotion devices are used in sedimentation basins to efficiently separate sediments (impurities) from treated water discharged from water treatment facilities such as water purification plants. The sedimentation promotion device includes, for example, a plurality of inclined plates (hereinafter referred to as "settling inclined plates") arranged at an angle to the horizontal, a support frame for arranging the inclined plates in multiple vertical rows and multiple horizontal rows, and a suspender for suspending the support frame above the sedimentation basin.

[0003] Such settling promotion devices generally have a simple support structure in which a support frame is simply suspended from the sedimentation basin structure via a suspending device. Therefore, if sloshing (vibration) of the water being treated occurs in the sedimentation basin due to an earthquake, the settling promotion device may also sway relative to the sedimentation basin. The sloshing of the settling promotion device may cause malfunctions such as damage or deformation of the support frame, settling inclined plate, and suspending device, or the settling inclined plate falling off the support frame. Therefore, numerous countermeasures against sloshing have been proposed, such as those described in Patent Documents 1 to 3.

[0004] In the sloshing suppression structure described in Patent Document 1, a shock absorber such as a coil spring member or a rubber-like elastic member is interposed between the frame that holds the inclined settling plate and the side wall of the settling tank. In the sloshing suppression structure described in Patent Document 2, a damper is interposed between a steel frame placed in the settling tank and the hook bolt that suspends the inclined plate unit. In the inclined plate settling system described in Patent Document 3, a wave breaker placed near the water surface of the settling tank suppresses the growth of waves caused by sloshing of the water to be treated. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-159199 [Patent Document 2] Patent No. 7075071 [Patent Document 3] Patent Publication No. 2021-171741 Summary of the Invention [Problem to be solved by the invention]

[0006] The sloshing suppression structure described in Patent Document 1 is susceptible to loss of its function as a shock absorber due to fatigue failure of the coil spring members and deterioration of the rubber-like elastic members. Furthermore, given that the shock absorber is constantly submerged in the treated water in the sedimentation basin, it is expected to deteriorate at a faster rate than if the shock absorber were installed above ground. Even if the shock absorber can prevent collisions between the side walls of the sedimentation basin and the frame, it cannot fully suppress the displacement of the frame itself, which could transfer loads to the hanging devices, such as the hanging hooks and hanging bolts, that suspend the frame, potentially leading to fatigue failure of the hanging devices. Furthermore, because the shock absorber is connected to the side walls of the sedimentation basin, the settling promotion device cannot be configured to be movable in the longitudinal direction of the basin.

[0007] In the sloshing suppression structure described in Patent Document 2, if the dimensions of the inclined plate unit increase in the width direction of the sedimentation tank, dampers must be interposed between multiple hook bolts, which increases the cost of sloshing prevention measures, making them uneconomical and complicated to install.

[0008] The inclined plate sedimentation system described in Patent Document 3 can suppress sloshing on the water surface of the sedimentation tank, but it cannot prevent displacement of the support frame that holds the inclined plate itself due to earthquakes, and there remains a concern that the support frame may collide with the side wall of the sedimentation tank and be damaged.

[0009] Therefore, an object of the present invention is to provide a settling promotion device that can inexpensively and reliably prevent damage to components due to sloshing. [Means for solving the problem]

[0010] In one aspect, a sedimentation promotion device is provided that is placed in a sedimentation tank and promotes the sedimentation of sediments contained in the water to be treated, and includes an inclined plate holding assembly that holds multiple sedimentation inclined plates parallel to each other, a suspension structure for supporting the inclined plate holding assembly, a hanging device for suspending the inclined plate holding assembly from the suspension structure, and a rotary support mechanism that is placed between the side wall of the sedimentation tank and the inclined plate holding assembly, wherein the rotary support mechanism includes a rotating body that contacts the side wall of the sedimentation tank or faces it with a small gap, a rotating shaft that is attached to the rotating body and extends vertically, a bearing that supports the rotating shaft, and a base to which the bearing is fixed.

[0011] In one embodiment, the rotating body has a cylindrical, columnar, or spherical shape. In one aspect, the settling promotion device further includes a pivot shaft connected to the bearing, and a pivot bearing that supports the pivot shaft so that it can pivot in the vertical direction. In one embodiment, the rotating body is made of resin, and the rotating shaft is made of metal. In one embodiment, the sedimentation promotion device further includes a spacer inserted between the base and the bearing. [Effects of the Invention]

[0012] Even if the inclined plate holder assembly attempts to oscillate in the width direction of the pond due to sloshing of the water being treated, the rotating body of the rotary support mechanism holds the inclined plate holder assembly against the side wall of the sedimentation basin, suppressing the oscillating movement of the inclined plate holder assembly in the width direction of the pond. When sloshing of the water being treated occurs in the sedimentation basin and the inclined plate holder assembly oscillates in the length direction of the pond, the rotating body of the rotary support mechanism rotates in contact with the side wall of the sedimentation basin, smoothly guiding the oscillating movement of the inclined plate holder assembly. Therefore, excessive loads due to sloshing in the length direction and the width direction of the pond are prevented from being applied not only to the stationary structure to which the inclined plate holder assembly is connected, but also to the inclined plate holder assembly itself. As a result, a simple and inexpensive configuration, such as installing a rotary support mechanism between the inclined plate holder assembly and the side wall of the sedimentation basin, can prevent damage to the components of the settling promotion device due to sloshing. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a plan view schematically showing a settling basin in which a settling promotion device according to one embodiment is disposed. [Figure 2] FIG. 2 is a schematic front view of the sedimentation promotion device shown in FIG. 1, viewed from the direction of flow of the water to be treated in the settling tank. [Figure 3] FIG. 3 is a schematic side view of the sedimentation promotion device shown in FIG. 1, as viewed from the side wall of the settling tank along the direction of flow of the water to be treated. [Figure 4] FIG. 4 is a front view of a support frame according to one embodiment. [Figure 5] FIG. 5 is a schematic diagram showing a settling inclined plate according to one embodiment. [Figure 6] FIG. 6 is a front view schematically showing a rotation support mechanism according to one embodiment. [Figure 7] FIG. 7 is a cross-sectional view schematically showing the rotation support mechanism shown in FIG. [Figure 8] FIG. 8(a) is a cross-sectional view that schematically shows a modified example of the rotation support mechanism shown in FIG. 7, and FIG. 8(b) is a front view that schematically shows the spacer shown in FIG. 8(a). [Figure 9]FIG. 9 is a front view schematically showing a rotation support mechanism according to another embodiment. [Figure 10] FIG. 10 is a cross-sectional view schematically showing the rotation support mechanism shown in FIG. [Figure 11] FIG. 11 is a schematic diagram showing an example in which the rotation direction of the rotor is deviated from the horizontal direction. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically illustrating a sedimentation basin in which a settling promotion device according to one embodiment is disposed. FIG. 2 is a schematic front view of the settling promotion device shown in FIG. 1 as viewed from the flow direction of the water to be treated in the settling basin, and FIG. 3 is a schematic side view of the settling promotion device shown in FIG. 1 as viewed from a side wall of the settling basin along the flow direction of the water to be treated. In the embodiments described below, as shown in FIG. 1, a horizontal direction D1 parallel to the flow direction F of the water to be treated may be referred to as the "pond length direction D1." A horizontal direction D2 perpendicular to the pond length direction D1 may be referred to as the "pond width direction D2." The pond length direction D1 is perpendicular to the vertical direction and parallel to the flow direction F of the water to be treated. The pond width direction D2 is perpendicular to the vertical direction and the flow direction F of the water to be treated.

[0015] The settling tank 1 shown in Fig. 1 is a facility for settling sediments (impurities) contained in the water to be treated, and has a generally rectangular shape in plan view. At least one settling promotion device 2 (four in Fig. 1) is disposed in the settling tank 1 to efficiently settle the sediments.

[0016] 2 and 3, the settling promotion device 2 includes a plurality of inclined settling plates 5 for promoting the settling of sediment, a plurality of (three in FIG. 3) support frames 6 for holding the plurality of inclined settling plates 5, a plurality of suspenders 7 for suspending the support frames 6, and a suspension structure 8 for suspending the suspenders 7. Hereinafter, a unit formed by the plurality of support frames 6 and the plurality of inclined settling plates 5 held by these support frames 6 will be referred to as an "inclined plate holding assembly 3."

[0017] As shown in FIG. 1 , the suspension structure 8 spans the sedimentation basin 1 in the width direction D2. The multiple inclined sedimentation plates 5 and support frame 6, i.e., the inclined plate support assembly 3, are supported on the ground or structure where the sedimentation basin 1 is formed via a suspender 7 and the suspension structure 8. Examples of the suspension structure 8 include precast concrete girders and steel girders. Although not shown, the suspension structure 8 may also be composed of a steel girder connected to the suspender 7 and extending in the width direction D2, a pair of rails laid on the ground or structure where the sedimentation basin 1 is formed and extending parallel to the length direction D1, and one or more pairs of wheels attached to the steel girders and capable of running on the pair of rails. In this configuration, the suspension structure 8 can be moved in the length direction D1, and the movement of the suspension structure 8 can move the inclined plate support assembly 3 in the length direction D1.

[0018] In this embodiment, the suspending device 7 is composed of a hook bolt 11 extending from the suspension structure 8 toward the support frame 6, and a connecting hook 12 fixed to the tip of the hook bolt 11. The connecting hook 12 is configured to be able to engage with the upper part of the support frame 6. Note that the configuration of the suspending device 7 is not limited to the configuration of this embodiment as long as the suspending device 7 can suspend the inclined plate holding assembly 3 from the suspension structure 8.

[0019] FIG. 4 is a front view of a support frame according to one embodiment. The support frame 6 shown in FIG. 4 has a substantially rectangular shape and is composed of a frame main body 6a constituting an outer frame and support members 6b and 6c for supporting the inclined submersion plate 5 at an angle. The frame main body 6a may be formed, for example, by welding four plate-like members together, or by fastening the four plate-like members together using bolts or the like. In one embodiment, the frame main body 6a may be formed by bending a single plate-like member. The support members 6b and 6c are, for example, wires stretched in a lattice pattern on the frame main body 6a. The support member 6b extends vertically, and the support member 6c extends horizontally. The support members 6b and 6c are stretched at equal intervals on the frame main body 6a to form a lattice of the same shape. This configuration allows parallel inclined submersion plates 5 to be arranged in multiple rows in the vertical direction.

[0020] As shown in FIG. 3, in this embodiment, the inclined plate holding assembly 3 includes three support frames 6 arranged at equal intervals in the pond length direction D1. In one embodiment, the inclined plate holding assembly 3 may include two support frames 6 arranged at equal intervals in the pond length direction D1, or may include three or more support frames 6. As shown in FIG. 2, the sedimentation inclined plate 5 is inserted obliquely into each lattice formed by the support members 6b and 6c of the support frame 6. When multiple sedimentation inclined plates 5 are inserted into each lattice of the support frame 6, each sedimentation inclined plate 5 is supported obliquely on the diagonal of each lattice formed by the support members 6b and 6c of the support frame 6. With this configuration, the multiple sedimentation inclined plates 5 are arranged parallel to each other. For ease of explanation, the three support frames 6 may be referred to as the first support frame 6A, the second support frame 6B, and the third support frame 6C along the flow direction F of the water to be treated (see FIG. 3).

[0021] Figure 5 is a schematic diagram showing a sedimentation inclined plate according to one embodiment. The sedimentation inclined plate 5 shown in Figure 5 has three notches 5a at its bottom. Each notch 5a is formed in the sedimentation inclined plate 5 so that the intersections of the support members 6b and 6c fit into the notches when the sedimentation inclined plate 5 is inserted into each grid of the support frame 6. By fitting each notch 5a into the support members 6b and 6c, the position of the inclined plate 5 relative to the multiple support frames 6 (i.e., 6A, 6B, and 6C) is determined and the sedimentation inclined plate 5 is prevented from falling off the support frame 6.

[0022] A sedimentation promotion device 2 having such a configuration is placed in a sedimentation tank 1, and the sediment contained in the treated water flowing into the sedimentation tank 1 is promoted to settle due to the increased settling area created by the multiple settling inclined plates 5.

[0023] 2 and 3, the settling promotion device 2 according to this embodiment further includes at least one (eight in FIGS. 2 and 3) rotation support mechanism 15 that functions as a countermeasure against sloshing that occurs in the water to be treated due to an earthquake, etc. Fig. 6 is a front view that schematically shows a rotation support mechanism according to one embodiment, and Fig. 7 is a cross-sectional view that schematically shows the rotation support mechanism shown in Fig. 6.

[0024] The rotation support mechanism 15 shown in FIGS. 6 and 7 includes a rotating body 20, a bearing 21 that rotatably supports the rotating body 20, and a base 23 to which the bearing 21 is fixed. In this embodiment, the rotating body 20 has a cylindrical (or columnar) shape and has a rotating shaft 27 at its center. The bearing 21 is configured to rotatably support the rotating shaft 27 of the rotating body 20. In this embodiment, a center line CL1 of the rotating shaft 27 extends in the vertical direction, and the rotating body 20 is rotatable in the horizontal direction. The rotating shaft 27 is provided on the rotating body 20 so that the center line CL1 of the rotating shaft 27 passes through the center of the rotating body 20. In one embodiment, the rotating body 20 may have a spherical shape. In this case, the rotating body 20 also has the rotating shaft 27 that extends in the vertical direction and is supported by the bearing 21.

[0025] In this embodiment, the base 23 is a substantially rectangular plate and is attached to the inclined plate holding assembly 3 by at least one fastener 24. For example, the inclined plate holding assembly 3 has a plate (not shown) such as a rib fixed to the support frame 6, and the base 23 is fixed to this plate by at least one fastener 24. The fastener 24 is, for example, a combination of a bolt and a nut, and in this case, the base 23 has a through-hole for passing the bolt through. In the example shown in FIGS. 6 and 7, the base 23 is fixed to the inclined plate holding assembly 3 by four fasteners 24 each consisting of a combination of a bolt and a nut.

[0026] 2 and 3, the settling promotion device 2 according to this embodiment has eight rotary support mechanisms 15. Four of the eight rotary support mechanisms 15 are arranged at the four corners of one side of the inclined plate holding assembly 3 facing one side wall (or inner wall) extending in the length direction D1 of the sedimentation basin 1, and the remaining are arranged at the four corners of the other side of the inclined plate holding assembly 3 facing the other side wall extending in the length direction D1 of the sedimentation basin 1. In the illustrated example, the four rotary support mechanisms 15 are attached to the upper and lower parts of two vertically extending side edges of the first support frame 6A, and the remaining rotary support mechanisms 15 are attached to the upper and lower parts of two vertically extending side edges of the third support frame 6C.

[0027] Each of the eight rotary support mechanisms 15 is disposed in the gap between the inclined plate holding assembly 3 and the side wall of the sedimentation tank 1. As shown in Figure 7, the outer periphery of the rotor 20 of each rotary support mechanism 15 is in contact with the side wall of the sedimentation tank 1. In one embodiment, the outer periphery of the rotor 20 of each rotary support mechanism 15 may face the side wall of the sedimentation tank 1 with a small gap therebetween.

[0028] The rotor 20 is made of a hard material and is configured to support the inclined plate holding assembly 3, which is pressed against the side wall of the sedimentation tank 1 when sloshing of the water to be treated occurs in the sedimentation tank 1 and the inclined plate holding assembly 3 oscillates in the tank width direction D2. In this embodiment, the rotor 20 is made of a hard resin. Making the rotor 20 from resin allows for inexpensive replacement of a deteriorated rotor 20. In one embodiment, the rotor 20 may be made of a metal such as stainless steel.

[0029] When sloshing of the water to be treated occurs in the sedimentation basin 1 and the inclined plate holding assembly 3 swings in the basin length direction D1, the inclined plate holding assembly 3 rotates starting from the connecting hook 12. At that time, the rotor 20 of the rotation support mechanism 15 rotates in contact with the side wall of the sedimentation basin, smoothly guiding the swing of the inclined plate holding assembly 3. As a result, excessive load is prevented from being applied not only to the hook bolt 11 and suspension structure 8 but also to the inclined plate holding assembly 3 itself.

[0030] As described above, even if the inclined plate holding assembly 3 attempts to sway in the pond width direction D2 due to sloshing of the water to be treated, the rotating body 20 of the rotary support mechanism 15 holds the inclined plate holding assembly 3 against the side wall of the settling basin, suppressing the swaying of the inclined plate holding assembly 3 in the pond width direction D2. Therefore, excessive loads due to sloshing in the pond length direction D1 and sloshing in the pond width direction D2 are prevented from being applied not only to the stationary structures to which the inclined plate holding assembly 3 is connected (e.g., the connecting bolts 11 and the suspension structure 8), but also to the inclined plate holding assembly 3 itself. In other words, a simple and inexpensive configuration in which the rotary support mechanism 15 is provided between the inclined plate holding assembly 3 and the side wall of the settling basin can prevent damage to the components of the settling promotion device 2 due to sloshing.

[0031] In one embodiment, the rotor 20 may be made of resin, and the rotating shaft 27 that penetrates the rotor 20 may be made of a metal that is harder than the resin. If the rotating shaft 27 is made of metal, the rotating shaft 27 is preferably made of a corrosion-resistant metal such as stainless steel. With this configuration, the rotor 20 wears or deteriorates before the rotating shaft 27, so that only the deteriorated or worn rotor 20 needs to be replaced during maintenance. As a result, the running costs of the sedimentation promotion device 2 can be reduced.

[0032] Fig. 8(a) is a cross-sectional view showing a modified example of the rotary support mechanism shown in Fig. 7, and Fig. 8(b) is a front view showing the spacer shown in Fig. 8(a). The configuration of this embodiment, which is not specifically described, is similar to the embodiment described with reference to Figs. 6 and 7, and therefore, redundant description will be omitted. The rotary support mechanism 15 shown in Fig. 8(a) differs from the above-described embodiment in that it includes a spacer 25 for adjusting the distance between the outer periphery of the rotor 20 and the side wall of the settling basin 1.

[0033] As shown in Fig. 8(a), the rotation support mechanism 15 includes a spacer 25 disposed between the base 23 and the bearing 21, and each fastener 24 is formed by a combination of a bolt and a nut. As shown in Fig. 8(b), the spacer 25 is a plate having substantially the same shape as the base 23. The spacer 25 has a plurality of through holes 25a that allow the bolts of each fastener 24 to pass through, and each through hole 25a of the spacer 25 is formed to correspond to each through hole formed in the base 23.

[0034] By inserting the bolts of each fixing device 24 into the through holes formed in the spacer 25 and the through holes formed in the base 23 and tightening the nuts, the spacer 25 is positioned relative to the base 23 and the distance between the rotor 20 and the side wall of the sedimentation tank 1 is adjusted according to the thickness of the spacer 25.

[0035] Fig. 9 is a front view schematically showing a rotation support mechanism according to another embodiment, and Fig. 10 is a cross-sectional view schematically showing the rotation support mechanism shown in Fig. 9. Configurations of this embodiment that are not particularly described are similar to those of the above-described embodiment, and therefore redundant description will be omitted. The rotation support mechanism 15 shown in Figs. 9 and 10 differs from the above-described embodiment in that it has a swivel bearing that supports the bearing 21 so that it can rotate in the vertical direction.

[0036] 10, a pivot shaft 28 is connected to bearing 21. Specifically, pivot shaft 28 is fixed to the underside of the main body of bearing 21. A center line CL2 of pivot shaft 28 passes through the center of rotating body 20 and intersects with a center line CL1 of rotating shaft 27 at the center of rotating body 20.

[0037] In this embodiment, the pivot shaft 28 is rotatably fitted into a pivot bearing 29 attached to the base 23. The pivot bearing 29 supports the bearing 21 so that it can rotate freely in the vertical direction. The pivoting of the bearing 21 in the vertical direction means that the bearing 21 rotates around a center line CL2 (see FIG. 10) of the pivot bearing 29 that extends horizontally, as indicated by the double-headed arrow R1 in FIG. 9. In this case, the center line CL1 of the bearing 21 rotates within an imaginary plane that extends vertically. Therefore, in the embodiment shown in FIGS. 6 and 7, the center line CL1 of the bearing 21 extends vertically, but in this embodiment, the pivot bearing 29 rotates the bearing 21, so that the center line CL1 can tilt from the vertical direction.

[0038] The slewing bearing 29 allows the rotational direction of the rotor 20 to be shifted from the horizontal. FIG. 11 is a schematic diagram illustrating an example in which the rotational direction of the rotor 20 is shifted from the horizontal. More specifically, FIG. 11 is a schematic diagram illustrating a state in which the center line CL1 of the rotation axis 27 of the rotor 20 is tilted leftward from the vertical. In this way, allowing the rotational direction of the rotor 20 to be freely shifted from the horizontal can more smoothly guide the inclined plate holding assembly 3, which swings from the connecting hook 12 as a starting point. As a result, excessive loads due to sloshing in the pond length direction D1 are more effectively prevented from being applied not only to stationary structures (e.g., the connecting bolt 11 and the suspension structure 8) to which the inclined plate holding assembly 3 is connected, but also to the inclined plate holding assembly 3 itself. In other words, damage to the components of the settling promotion device 2 due to sloshing can be more effectively prevented.

[0039] In this embodiment, as shown in Fig. 10, the settling promotion device 2 may also have the above-mentioned spacer 25. In this case, the spacer 25 has a through-hole that allows the rotation shaft 28 to pass through. The bearing 21 of the spacer 25 is supported by the rotation bearing 29 through a through-hole (see dotted line in Fig. 8(b)) formed in the spacer 25.

[0040] The settling promotion device 2 may have a stopper that prevents excessive rotation of the bearing 21 in the vertical direction. In the embodiment shown in Figures 9 and 10, the bolt head (or nut) of the fixing device 24 that protrudes from the surface of the base 23 also serves as the stopper. Although not shown, a protrusion that functions as a stopper may be provided on the upper surface of the base 23 in addition to the fixing device 24.

[0041] In the example shown in Fig. 10, bearing 21 has arm 21a that can engage with a stopper. As shown in Fig. 11, when bearing 21 rotates due to swivel bearing 29, the side surface of arm 21a abuts against fixture 24 that functions as a stopper, thereby limiting the range of rotation of bearing 21. The stopper prevents center line CL1 of rotation shaft 27 of rotating body 20 from tilting horizontally.

[0042] In the embodiment described so far, the settling promotion device 2 has eight rotary support mechanisms 15. However, the number of rotary support mechanisms 15 is not limited to this example as long as the rotary support mechanisms 15 are able to support the inclined plate holding assembly 3 that is pressed against the side wall of the settling basin. In other words, the number of rotary support mechanisms 15 is not limited to this example. In other words, the settling promotion device 2 only needs to have at least one rotary support mechanism 15.

[0043] The above-described embodiments have been described for the purpose of enabling a person of ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments would be obvious to a person skilled in the art, and the technical concept of the present invention may be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope in accordance with the technical concept defined by the claims. [Explanation of symbols]

[0044] 1. Precipitation area 2. Sedimentation accelerator 3 Inclined Plate Holding Assembly 5 Inclined plate 6 Support Frame 7 Hanging device 8 Suspension structure 11 Connecting bolt 12 Connecting hooks 15 Rotation support mechanism 20 Rotating Body 21 Bearings 23 Base 24 Fixtures 25 spacer 27 Rotation axis 28 Swivel Axis 29 Slewing bearing

Claims

1. A sedimentation promotion device that is placed in a sedimentation tank and promotes the settling of sediments contained in the water to be treated, a tilt plate support assembly for supporting the plurality of settling tilt plates parallel to one another; a suspension structure for supporting the ramp support assembly; a hanger for suspending the ramp support assembly from the suspension structure; a rotation support mechanism disposed between the side wall of the settling basin and the inclined plate holding assembly; The rotation support mechanism includes: a rotor that contacts the side wall of the settling tank or faces the side wall with a small gap; a rotation shaft provided on the rotor and extending in a vertical direction; a bearing for supporting the rotating shaft; a base to which the bearing is fixed.

2. The sedimentation promotion device according to claim 1 , wherein the rotating body has a cylindrical, columnar, or spherical shape.

3. a pivot shaft connected to the bearing; The settling promotion device according to claim 1 , further comprising a swivel bearing that supports the swivel shaft so that it can rotate in the vertical direction.

4. The rotating body is made of resin, The sedimentation promotion device according to claim 1 , wherein the rotating shaft is made of metal.

5. The settling promotion device of claim 1 , further comprising a spacer interposed between the base and the bearing.

Images