Sedimentation Accelerator

Abstract

A settling promotion device capable of inexpensively and reliably suppressing damage to components caused by sloshing is provided. [Solution] The settling promotion device 2 comprises an inclined plate holding assembly 3 that holds a plurality of settling inclined plates 5 parallel to one another, a suspension structure 8 for supporting the inclined plate holding assembly 3, a hanging device 7 for suspending the inclined plate holding assembly 3 from the suspension structure 8, and a rotation support mechanism 15 disposed between the side wall of the settling tank 1 and the inclined plate holding assembly 3. The rotation support mechanism 15 includes a rotor 20 that contacts the side wall of the settling tank 1, a rotation shaft 27 that is provided on the rotor 20 and extends in the vertical direction, a bearing 21 that supports the rotation shaft 27, and a base 23 to which the bearing 21 is fixed.

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 against sloshing. [Background technology]

[0002] A settling promotion device is used in a settling basin to efficiently separate sediment (impurities) from treated water discharged from a water treatment facility such as a water purification plant. The settling promotion device includes, for example, a plurality of inclined plates (hereinafter referred to as "settling inclined plates") arranged at an angle to the horizontal direction, a support frame for arranging the settling inclined plates in a plurality of stages in the vertical direction and in a plurality of rows in the horizontal direction, and a suspending tool for suspending the support frame in the settling basin.

[0003] Such a settling promotion device generally has a simple support structure in which the support frame is simply suspended from the structure of the settling tank via a suspending device. Therefore, when sloshing (rocking) of the water to be treated caused by an earthquake occurs in the settling tank, the settling promotion device may also rock relative to the settling tank. Rocking of the settling promotion device may lead to problems such as damage or deformation of the components of the settling promotion device, such as the support frame, the settling inclined plate, and the suspending device, or the settling inclined plate falling off the support frame. Therefore, many measures 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 stand placed in the settling tank and a hook bolt that suspends the inclined plate unit. In the inclined plate settling system described in Patent Document 3, a breakwater placed near the water surface of the settling tank suppresses the growth of sloshing waves of the water to be treated. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-159199 A [Patent Document 2] Patent No. 7075071 [Patent Document 3] JP 2021-171741 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the sloshing suppression structure described in Patent Document 1, there is a concern that the function as a shock absorber will be lost due to fatigue failure of the coil spring member or deterioration of the rubber-like elastic member. Furthermore, considering that the shock absorber is always submerged in the water to be treated in the sedimentation basin, it is expected that the shock absorber will deteriorate at a faster rate than if it were placed on the ground. Furthermore, even if the shock absorber can prevent the side wall of the sedimentation basin from colliding with the frame, it cannot completely suppress the displacement of the frame itself, and the load will be transmitted to the hanging device such as the hanging hook or hanging bolt that hangs the frame, which may lead to fatigue failure of the hanging device. Furthermore, since the shock absorber is connected to the side wall of the sedimentation basin, it is not possible to configure the settling promotion device to be movable in the basin length direction.

[0007] In the sloshing prevention structure described in Patent Document 2, when the dimensions of the inclined plate unit become large in the width direction of the settling 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 cannot prevent displacement of the support frame itself that holds the inclined plate 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 suppress damage to components caused by sloshing. [Means for solving the problem]

[0010] In one aspect, a settling promotion device is provided that is placed in a sedimentation tank and promotes the settling of sediments contained in the water to be treated, the settling promotion device comprising: an inclined plate holding assembly that holds a plurality of settling 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 rotating support mechanism that is placed between the side wall of the settling tank and the inclined plate holding assembly, the rotating support mechanism including a rotating body that contacts the side wall of the settling tank or faces it with a small gap, a rotating shaft that is provided on 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 rotating shaft connected to the bearing, and a rotating bearing that supports the rotating shaft so that it can rotate in a 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 interposed between the base and the bearing. Effect of the Invention

[0012] Even if the inclined plate holding assembly swings in the width direction of the pond due to sloshing of the water to be treated, the inclined plate holding assembly is held down by the rotor of the rotary support mechanism against the side wall of the sedimentation pond, and the swinging of the inclined plate holding assembly in the width direction of the pond is suppressed. When sloshing of the water to be treated occurs in the sedimentation pond and the inclined plate holding assembly swings in the length direction of the pond, the rotor of the rotary support mechanism rotates in contact with the side wall of the sedimentation pond, smoothly guiding the swinging of the inclined plate holding assembly. Therefore, excessive loads due to sloshing in the length direction of the pond and sloshing in the width direction of the pond are prevented from being applied not only to the stationary structure to which the inclined plate holding assembly is connected, but also to the inclined plate holding assembly itself. As a result, damage to the components of the settling promotion device due to sloshing can be prevented with a simple and inexpensive configuration in which the rotary support mechanism is provided between the inclined plate holding assembly and the side wall of the sedimentation pond. [Brief description of the drawings]

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

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a sedimentation tank in which a sedimentation promotion device according to an embodiment is disposed. FIG. 2 is a schematic front view of the sedimentation promotion device shown in FIG. 1 as viewed from the flow direction of the water to be treated in the sedimentation tank, and FIG. 3 is a schematic side view of the sedimentation promotion device shown in FIG. 1 as viewed from a side wall along the flow direction of the water to be treated in the sedimentation tank. In the embodiment 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 a "pond length direction D1". A horizontal direction D2 perpendicular to the pond length direction D1 may be referred to as a "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 a plan view. At least one settling promotion device 2 (four in Fig. 1) is disposed in the settling tank 1 for efficiently settling the sediments.

[0016] 2 and 3, the settling promotion device 2 includes a plurality of inclined settling plates 5 for promoting the settling of sediments, 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 is suspended in the pond width direction D2 of the sedimentation pond 1, and the multiple settling inclined plates 5 and the support frame 6, i.e., the inclined plate holding assembly 3, are supported on the ground or structure on which the sedimentation pond 1 is formed via the suspension device 7 and the suspension structure 8. Examples of the suspension structure 8 include PC girders and steel girders. Although not shown, the suspension structure 8 may be composed of a steel girder connected to the suspension device 7 and extending in the pond width direction D2, a pair of rails laid on the ground or structure on which the sedimentation pond 1 is formed and extending parallel to the pond length direction D1, and one or more pairs of wheels provided on the steel girders and capable of running on the pair of rails. In this configuration, the suspension structure 8 can be moved in the pond length direction D1, and the inclined plate holding assembly 3 can be moved in the pond length direction D1 by the movement of the suspension structure 8.

[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 that 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 an embodiment. The support frame 6 shown in FIG. 4 has a substantially rectangular shape and is composed of a frame body 6a constituting an outer frame, and support members 6b and 6c for supporting the subsidence inclined plate 5 at an angle. The frame body 6a may be formed, for example, by welding four plate-shaped bodies, or by fastening the four plate-shaped bodies using bolts or the like. In one embodiment, the frame body 6a may be formed by bending one plate-shaped body. The support members 6b and 6c are, for example, wires stretched in a lattice shape on the frame body 6a. The support member 6b extends in the vertical direction, and the support member 6c extends in the horizontal direction. The support members 6b and 6c are stretched at equal intervals on the frame body 6a so as to form a lattice of the same shape. With this configuration, the subsidence inclined plates 5 parallel to each other can be arranged in a plurality of stages 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 line 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 so as to be parallel to each other. Hereinafter, for convenience 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] FIG. 5 is a schematic diagram showing a subsidence inclined plate according to one embodiment. The subsidence inclined plate 5 shown in FIG. 5 has three notches 5a at its lower part. Each notch 5a is formed in the subsidence inclined plate 5 so that the intersections of the support members 6b and 6c fit into the notches 5a when the subsidence inclined plate 5 is inserted into each lattice 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 subsidence inclined plate 5 is prevented from falling off the support frame 6.

[0022] A settling promotion device 2 having such a configuration is placed in a settling tank 1, and the settling of sediments contained in the water to be treated that flows into the settling tank 1 is promoted by the increased settling area provided by the multiple settling inclined plates 5.

[0023] As shown in Figures 2 and 3, the settling promotion device 2 according to this embodiment further includes at least one (eight in Figures 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. Figure 6 is a front view that shows a schematic diagram of a rotation support mechanism according to one embodiment, and Figure 7 is a cross-sectional view that shows a schematic diagram of the rotation support mechanism shown in Figure 6.

[0024] The rotation support mechanism 15 shown in FIG. 6 and FIG. 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 shape (or a 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 body, 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 body (not shown) such as a rib fixed to the support frame 6, and the base 23 is fixed to this plate body 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. 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 rotation support mechanisms 15. Four of the eight rotation support mechanisms 15 are arranged at the four corners of one side surface of the inclined plate holding assembly 3 facing one side wall (or inner wall) extending in the length direction D1 of the settling basin 1, and the remaining are arranged at the four corners of the other side surface of the inclined plate holding assembly 3 facing the other side wall extending in the length direction D1 of the settling basin 1. In the illustrated example, the four rotation 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 rotation 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 rotating support mechanisms 15 is disposed in a gap between the inclined plate holding assembly 3 and the side wall of the sedimentation tank 1. As shown in Fig. 7, the outer periphery of the rotor 20 of each rotating 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 rotating 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 be able to support the inclined plate holding assembly 3 that 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 a 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 settling tank 1 and the inclined plate holding assembly 3 swings in the tank 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 settling tank, 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 the 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 inclined plate holding assembly 3 is held down by the rotor 20 of the rotary support mechanism 15 against the side wall of the settling pond, and the swinging of the inclined plate holding assembly 3 in the pond width direction D2 is suppressed. 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 (e.g., the connecting bolts 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, 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 pond 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 penetrating the rotor 20 may be made of a metal harder than the resin. When 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 such a 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 not specifically described is similar to the embodiment described with reference to Figs. 6 and 7, and therefore the overlapping description will be omitted. The rotary support mechanism 15 shown in Fig. 8(a) differs from the above-mentioned embodiment in that it is provided with a spacer 25 for adjusting the distance between the outer periphery of the rotor 20 and the side wall of the settling tank 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 rotating body 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 showing a rotation support mechanism according to another embodiment, and Fig. 10 is a cross-sectional view showing the rotation support mechanism shown in Fig. 9. The configuration of this embodiment that is not particularly described is similar to that of the above-mentioned embodiment, and therefore the duplicated description will be omitted. The rotation support mechanism 15 shown in Figs. 9 and 10 differs from the above-mentioned embodiment in that it has a swivel bearing that supports the bearing 21 rotatably in the vertical direction.

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

[0037] In this embodiment, the rotating shaft 28 is rotatably fitted into the rotating bearing 29 attached to the base 23. The rotating bearing 29 supports the bearing 21 so that it can rotate in the vertical direction. The vertical rotation of the bearing 21 means that the bearing 21 rotates around the center line CL2 (see FIG. 10) of the rotating bearing 29 extending in the horizontal direction, as shown 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 extending in the vertical direction. Therefore, in this embodiment, the center line CL1 of the bearing 21, which extends in the vertical direction in the embodiment shown in FIG. 6 and FIG. 7, can be tilted from the vertical direction by the rotating bearing 29 rotating the bearing 21.

[0038] The swivel bearing 29 allows the rotation direction of the rotor 20 to be shifted from the horizontal direction. FIG. 11 is a schematic diagram showing an example in which the rotation direction of the rotor 20 is shifted from the horizontal direction. More specifically, FIG. 11 is a schematic diagram showing a state in which the center line CL1 of the rotation shaft 27 of the rotor 20 is tilted leftward from the vertical direction. In this way, if the rotation direction of the rotor 20 can be freely shifted from the horizontal direction, the inclined plate holding assembly 3, which swings from the connecting hook 12 as a starting point, can be guided more smoothly. As a result, it is more effectively prevented that an excessive load due to sloshing in the pond length direction D1 is applied not only to the stationary structure to which the inclined plate holding assembly 3 is connected (for example, the connecting bolt 11 and the suspension structure 8, etc.) but also to the inclined plate holding assembly 3 itself. That is, it is more effectively prevented that the components of the settling promotion device 2 are damaged due to sloshing.

[0039] In this embodiment, the settling promotion device 2 may also have the above-mentioned spacer 25, as shown in Fig. 10. 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 the 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 fastener 24 protruding 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 fastener 24.

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

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

[0043] The above-described embodiments have been described for the purpose of enabling a person having ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments are naturally possible for a person skilled in the art, and the technical idea of ​​the present invention can 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 according to the technical idea defined by the claims. [Explanation of symbols]

[0044] 1 Precipitation area 2. Sedimentation Accelerator 3. Tilt Plate Holding Assembly 5 Inclined plate 6 Support frame 7 Hanging fixture 8 Suspension structure 11 Connecting bolt 12 Connecting hook 15 Rotational support mechanism 20 Rotating Body 21 Bearings 23 Base 24 Fixtures 25 Spacer 27 Rotational Axis 28 Swivel Axis 29 Slewing bearing

Claims

1. A settling promotion device that is disposed in a settling tank and promotes settling of sediments contained in the water to be treated, a tilt plate support assembly for supporting the plurality of submerged tilt plates parallel to each other; a suspension structure for supporting the ramp retention assembly; a hanger for suspending the ramp support assembly from the suspension structure; a rotation support mechanism disposed between a side wall of the settling basin and the inclined plate support assembly; The tilt plate holding assembly includes: A plurality of support frames; The device is made up of a plurality of sinking inclined plates supported by the support frames, 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; and 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 the swivel shaft 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