Scum prevention device

Abstract

To provide a scum prevention device where structure is simplified, scum formation prevention, breakage and resettling can be effectively performed and the risk of damage at sloshing can be eliminated.SOLUTION: In a scum prevention device 100, scum formation prevention, breakage and resettling caused in a center well 70 are promoted. The scum prevention device 100 has hanging members 117 (117A, 117B) installed at a revolving shaft 40 side in the center well 70 and a travelling body 130 being rotationally hung under a water surface by the hanging members 117 and rotationally travelling around the water surface with the revolving shaft 40. The travelling body 130 is a flexible linear material (chain) and hung at a plurality of the hanging members 117.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a scum prevention device that suppresses and prevents scum generation in a center well installed in a solid-liquid separation device. [Background Art]

[0002] Conventionally, there are solid-liquid separation devices (such as sedimentation tanks and concentration tanks) that rotationally drive a scraper installed in a water tank via a rotating shaft to scrape settled sediment (solid content) and discharge it out of the system. In this type of solid-liquid separation device, a center well for uniformly and radially dispersing raw water to be treated (inflow water) into the tank is installed around the rotating shaft near the water surface at the center of the tank.

[0003] In the above-mentioned center well, there has been a problem that among SS components such as flocs flowing in from the inflow pipe, those that are relatively easy to float accumulate near the water surface, forming scum and accumulating there.

[0004] Therefore, conventionally, it has been necessary to spray high-pressure washing water from above toward the water surface in the center well to promote the destruction and re-sedimentation of generated scum, or to frequently perform regular manual scum removal work.

[0005] However, the destruction and re-sedimentation of scum by the above-mentioned high-pressure washing water requires a large amount of water, and the effect is not sufficient; moreover, frequent manual scum removal work is very cumbersome.

[0006] In order to solve the above problems, Patent Document 1 discloses a scum removal device comprising a fixed member (21) installed near the water surface in a center well (1) and a rotating member (22) installed so as to be able to travel near the water surface, wherein a rotating plate-shaped body (22b) constituting the rotating member (22) rotationally travels between plate-shaped bodies (21b) constituting the fixed member (21), thereby crushing scum staying near the water surface in the center well (1) and dispersing it under the water surface. [Prior Art Documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Utility Model Publication No. 60-17292 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, the scum removal device described in Patent Document 1 above has a structure in which a large mechanism such as a fixed member (21) and a rotating member (22) is installed inside the center well (1), which is costly, and further simplification of the structure was needed. In addition, stirring the water with the rotating plate-like body (22b) exerts a strong force on the water, which may not only remove the scum but also inhibit the growth of sedimentable flocs.

[0009] Furthermore, if sloshing occurs in the water within the center well due to an earthquake or other event, the plate-like bodies (21b) and rotating plate-like bodies (22b) may be subjected to significant water resistance and could be damaged. If the plate-like bodies (21b) or other components are damaged by sloshing and their parts fall to the bottom of the circular sedimentation tank (A), the water in the circular sedimentation tank (A) must be drained and the fallen parts recovered, requiring considerable effort for the restoration work. For this reason, damage to the plate-like bodies (21b) and other components must be reliably prevented.

[0010] This invention has been made in view of the above-mentioned points, and its purpose is to provide a scum prevention device that simplifies the structure, can effectively prevent scum formation, destroy it, and allow it to re-sediment, and is not susceptible to damage during sloshing. [Means for solving the problem]

[0011] The present invention relates to a scum prevention device for preventing scum from forming in a center well installed around the water surface of a rotating shaft of a solid-liquid separation device in which a scraper installed in a water tank is rotated by a rotating shaft, the device comprising a suspension part installed on the rotating shaft side within the center well, and the suspension part below the water surface, so as to sway in accordance with the sloshing that occurs in the water in the center well, It is characterized by having a traveling body that is suspended so as to be able to swing and rotates along the rotating shaft near the water surface. According to the present invention, a mobile body suspended to swing freely below the water surface in the center well rotates, so that the mobile body directly contacts the scum that is about to accumulate near the water surface in the center well, and the physical stimulation can destroy and re-sediment the scum. Furthermore, it can directly contact the raw materials (SS components) of the scum that are about to be formed, and the physical stimulation can suppress the formation of the scum. Through these actions, the formation of scum in the center well can be effectively prevented, destroyed, and re-sedimented. In addition, since the mobile body is suspended below the water surface so that it can swing freely, the water is not forcibly stirred, and this does not hinder the growth of sedimentable flocs. Furthermore, since the present invention has a configuration in which the traveling body is suspended from the suspension part so as to be able to swing, the structure can be simplified. Furthermore, since the vehicle is suspended below the water surface and can swing freely, there is no risk of damage to the vehicle even if sloshing occurs in the water in the center well due to an earthquake or other event. Furthermore, because it is suspended below the water surface and can swing freely, the suspension work on the vehicle can be easily performed, and maintenance such as checking the condition of the suspension part, especially below the water surface, and cleaning can also be easily carried out.

[0012] Furthermore, in addition to the above features, the present invention is characterized in that a fall prevention device is provided between the suspension part and the traveling body to prevent the traveling body from falling off the suspension part. If the vehicle were to detach from the suspension point, it would fall to the bottom of the water tank, making recovery difficult and requiring the solid-liquid separation device to shut down. However, this danger can be reliably prevented according to the present invention.

[0013] Furthermore, in addition to the above features, the present invention is characterized in that the traveling body is detachably suspended from the suspension part. According to the present invention, the traveling body can be easily removed from the suspension part when inspecting the traveling body, etc.

[0014] Furthermore, in addition to the above features, the present invention is characterized in that the traveling body is a flexible linear object. Chains are particularly suitable as linear materials. According to the present invention, since the vehicle itself oscillates when sloshing occurs, the scum prevention device can be prevented from being destroyed more effectively. Furthermore, its flexibility allows for easy suspension of the vehicle to the suspension section, as well as easy changes to the vehicle's suspension position, and maintenance such as checking and cleaning the suspension section, especially the area below the water surface. It also facilitates adjustments to the suspension length and other settings.

[0015] In addition to the above features, the present invention is characterized in that the suspension parts are provided at multiple locations, and the linear traveling body is suspended from the multiple suspension parts. According to the present invention, the number of vehicles suspended below the water surface can be easily increased by a single linear vehicle.

[0016] Furthermore, in addition to the above features, the present invention is characterized by having a cleaning device that sprays cleaning water toward the water surface in the center well and toward any position in the movement trajectory of the rotating part of the scum prevention device. According to the present invention, by spraying cleaning water onto the water surface in the center well, the destruction and re-settling of scum by the moving body can be reinforced and further promoted. Furthermore, since the cleaning water is directed at any part of the movement trajectory of the rotating part of the scum prevention device, the cleaning water that hits the scum prevention device during rotation flows down the moving body, removing any floating matter remaining attached to the moving body and allowing it to re-settle, thereby maintaining the scum-breaking performance of the moving body.

[0017] In addition to the above features, the present invention is further characterized by the installation of a traveling body oscillating means at a position that contacts and oscillates any part of the rotating traveling body. According to the present invention, since the traveling body can be forcibly oscillated by the traveling body oscillating means, physical stimulation to the floated SS content and scum can be enhanced within an appropriate range, and the action and effect of the traveling body can be increased to more effectively prevent the generation, destroy and re-sediment scum generated in the center well. In addition, when the traveling body abuts against the traveling body oscillating means, suspended solids adhering to the traveling body can be removed and re-sedimented, and the scum destruction performance of the traveling body can also be maintained. Effects of the Invention

[0018] According to the present invention, scum generation prevention, destruction and re-sedimentation can be effectively performed with a simple structure. It can also prevent damage during sloshing. Brief Description of the Drawings

[0019] [Figure 1] It is a schematic side sectional view showing an example of a solid-liquid separation device 1 configured using the scum prevention device 100. [Figure 2] It is a schematic plan view of essential parts showing a portion lower than the scum prevention device 100 of the solid-liquid separation device 1. [Figure 3] It is an enlarged perspective view of essential parts, when a vicinity portion of the scum prevention device 100 is viewed from diagonally above. [Figure 4] It is a schematic side sectional view of the scum prevention device 100. [Figure 5] It is a schematic bottom view of essential parts showing a portion of the hanging part 117 (excluding the shackle 117B) viewed from below. [Figure 6] It is a schematic side sectional view of a scum prevention device 100-2. [Figure 7] It is a schematic side sectional view of a scum prevention device 100-3. Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a schematic side cross-sectional view showing an example of a solid-liquid separation apparatus 1 configured using a scum prevention device 100 according to one embodiment of the present invention. Figure 2 is a schematic plan view of the main part of the solid-liquid separation apparatus 1 showing the portion below the scum prevention device 100. As shown in these figures, the solid-liquid separation apparatus 1 is configured to include a water tank (sedimentation tank) 10, a walkway 20 installed so as to straddle the water tank 10, a drive unit 30 installed in the center of the walkway 20, a rotating shaft 40 suspended from the drive unit 30, a scraper 50 attached to the lower part of the rotating shaft 40, a cylindrical center well 70 installed around the rotating shaft near the water surface, a scum prevention device 100 attached near the water surface of the rotating shaft 40, and an inlet pipe 60 that supplies inflowing water from outside the water tank 10 into the center well 70.

[0021] The water tank 10 is a coagulation and sedimentation tank, formed in a circular shape, with a concave sediment collection section 11 in the center of its bottom surface, and a treated water drainage trough 13 near the water surface on its inner circumference. The scraper 50 is configured to have a scraper blade 53 attached to a scraper arm 51 and to rotate integrally with the rotating shaft 40.

[0022] The center well 70 is a cylindrical body with open top and bottom, surrounding the rotating shaft 40, and is installed so that its upper part is near the water surface (slightly above the water surface). The center well 70 is suspended from the walkway 20 by several (four in this example) support columns 71. The inlet pipe 60 is connected to the lower part of the outer circumferential side of the center well 70.

[0023] A scum prevention device 100 is attached to the rotating shaft 40. Figure 3 is an enlarged perspective view of the main part near the scum prevention device 100, seen from an oblique upward direction; Figure 4 is a schematic side cross-sectional view of the part near the scum prevention device 100; and Figure 5 is a schematic bottom view of the main part of the scum prevention device 100, seen from below, with the traveling body 130 and shackle 117B2 removed.

[0024] As shown in these figures, the scum prevention device 100 is configured to include a pair of suspension support members 110 fixed to the rotating shaft 40, and a traveling body 130 suspended from a plurality of suspension parts 117 (117A, 117B) provided on each suspension support member 110.

[0025] The suspension support member 110 comprises a pair of mounting seats 111, 111 whose ends are fixed to the rotating shaft 40, and a pair of extension members 113, 113 which are attached to the tip ends of each mounting seat 111, 111.

[0026] The pair of mounting seats 111 are flat and are installed so as to protrude radially outward from the rotation axis 40, in directions that are 180 degrees apart. Four mounting holes (not shown) are provided on the surface of each mounting seat 111, in pairs in parallel. The extension member 113 in this example is an L-shaped angle, and one end of it is fixed to the mounting holes in one row of the mounting seats 111 by fixing means 115 consisting of bolts and nuts, and these mounting seats 111 and extension member 113 constitute the suspension support member 110. In addition, two suspension parts 117 (locking suspension parts 117A) consisting of J-shaped rod members are fixed to the mounting holes in the other row of the mounting seats 111 so as to hang downward from the lower surface of the mounting seats 111 by fixing means 115 such as nuts.

[0027] Multiple (three in this example) suspension parts 117 (two locking suspension parts 117A and one fixing suspension part 117B) are attached to the extension member 113 at approximately equal intervals. The suspension parts 117 are constructed by attaching two locking suspension parts 117A, which are made of J-shaped rod members, and one fixing suspension part 117B, which consists of a U-shaped rod member 117B1 and a shackle 117B2 connected to the rod member 117B1, to the lower surface of the extension member 113, which is made of an L-shaped angle. The rod members 117B1 of the locking suspension parts 117A and the fixing suspension part 117B are fixed to the extension member 113 by welding or other fixing means. The locking suspension parts 117A (including those fixed to the mounting seat 111) are detachable suspension devices that detachably suspend the traveling body 130 described below. The fixing suspension part 117B is a fall prevention device that secures the traveling body 130 as described below. The shackle 117B2 is detachably connected to the U-shaped rod member 117B1, and the traveling body 130 can be connected to and fixed to this shackle 117B2.

[0028] In this embodiment, the traveling body 130 uses a stainless steel chain, with one chain used for each of the pair of suspension support members 110. The traveling body 130 is fixed at one end to the fixing suspension part 117B (its shackle 117B2) of the suspension support member 110, and is sequentially hooked onto each of the J-shaped locking suspension parts 117A toward the rotation axis 40, with a predetermined length of slack. At this time, the slackened traveling body 130 is set to a length that allows it to be submerged from above the water surface to below the water surface by a predetermined length (for example, about 10 cm).

[0029] The straight line connecting the three suspension parts 117 on the extension member 113 and the straight line connecting the two suspension devices 117 on the mounting base 111 are offset to be approximately parallel. Therefore, the orientation of the traveling body 130 that is suspended to connect the suspension parts 117 on the mounting base 111 side and the suspension parts 117 on the extension member 113 side is set to be tilted at an angle to the orientation of the traveling bodies 130 suspended on both sides. In other words, the orientation of the traveling bodies 130 at both ends is different from the orientation of the traveling body 130 in the central part. As a result, when the traveling body 130 is rotated underwater as described below, the mixing state of the water can be made more complex, and the actions and effects of the traveling body 130 described below can be increased.

[0030] In the solid-liquid separation apparatus 1 configured as described above, when, for example, water to be treated (raw water) to which a coagulant has been added flows into the center well 70 from the inlet pipe 60, the water to be treated is evenly dispersed from the bottom of the center well 70 into the external water tank 10, where it forms flocs and settles on the bottom of the water tank 10. The settled flocs are collected in the sediment collection section 11 by a scraper 50 driven by a rotating shaft 40, and discharged out of the system by a drain pipe (not shown).

[0031] On the other hand, within the center well 70, relatively easily floating suspended solids (SS) such as flocs entering from the inlet pipe 60 tend to accumulate near the water surface in the center well 70, forming scum. However, in this embodiment, the traveling body 130 of the scum prevention device 100 rotates along with the rotation of the rotating shaft 40 from above the water surface to a predetermined water depth. Therefore, the SS (raw material for scum) that has floated to the water surface is stimulated to re-settle by the physical stimulation of direct contact with the traveling body 130 before it can grow into scum, thereby suppressing and preventing scum formation. Furthermore, scum that has already formed and floated is also destroyed by the physical stimulation of direct contact with the traveling body 130, and its re-settlement is promoted. In other words, these actions effectively prevent, destroy, and re-settle scum within the center well 70.

[0032] Since the traveling body 130 is suspended from the water surface to a predetermined depth below the water surface, it can destroy scum that is trying to grow not only above the water surface but also below it, thereby significantly suppressing scum formation. This allows for the suppression, destruction, and re-settling of scum below the water surface, compared to conventional methods of removing scum above the water surface by spraying a large amount of washing water. In other words, washing water can be eliminated or greatly reduced, and the scum prevention effect can be greatly increased.

[0033] Since the traveling body 130 is suspended below the water surface so as to be able to swing freely, it can physically stimulate and destroy the floating suspended solids (SS) and scum without forcibly agitating the water. At the same time, because it does not forcibly agitate the water, it does not inhibit the growth of sinking flocs.

[0034] Furthermore, since the traveling body 130 is suspended below the water surface so as to be able to swing freely, even if sloshing occurs in the water in the center well 70 due to an earthquake or the like, it will swing in accordance with the sloshing and there is no risk of damage. In particular, if the traveling body 130 is made of a linear material that is itself flexible, such as the chain that makes up the traveling body 130, the traveling body 130 itself will swing when sloshing occurs, so damage to the scum prevention device 100 can be prevented more effectively. In addition, since the traveling body 130 is suspended below the water surface so as to be able to swing freely, the operation of suspending the traveling body 130 to the suspension part 117 can be easily performed, and maintenance such as checking the condition of the suspension part 117, especially below the water surface, and cleaning can be easily performed.

[0035] Furthermore, if the traveling body 130 were to detach from the suspension part 117 and fall, it would fall to the bottom of the water tank 10, making recovery difficult and requiring the solid-liquid separation device 1 to shut down. However, since the traveling body 130 is fixed by the fixing suspension part 117B, which is a fall prevention device, this danger can be reliably prevented.

[0036] Furthermore, the fixing suspension part 117B, which is a fall prevention device, only needs to be provided at least once per vehicle, and the other locking suspension parts 117A on the vehicle 130 are simply suspended so that they can be easily attached and detached, as in the embodiment described above. This allows the vehicle 130 to be easily removed from the locking suspension parts 117A when inspecting the vehicle, and the suspension length can be easily adjusted by changing the suspension position as needed. If the inspection of the vehicle 130 reveals that it needs to be replaced due to rust or other reasons, the vehicle 130 can be removed from all the suspension parts 117 and replaced. When attaching or detaching the vehicle 130, for example, by using a hooking jig with a J-shaped hook at the end of a long rod, the flexible vehicle 130 (especially the chain) can be hooked onto it, and the vehicle 130 can be easily removed from the suspension parts 117 and pulled up to the water surface.

[0037] By suspending multiple flexible linear running bodies 130, such as the chain that makes up this running body 130, from multiple suspension points 117, the operation of suspending the running bodies 130 from multiple suspension points 117 can be easily performed, and the effective number of running bodies 130 suspended below the water surface can be easily increased by a single linear running body 130.

[0038] Figure 6 is a schematic side cross-sectional view of a scum prevention device 100-2 according to another embodiment that enhances the scum removal effect. In the scum prevention device 100-2 shown in the figure, the same or equivalent parts as those in the scum prevention device 100 shown in Figures 1 to 5 are denoted by the same reference numerals. Except for matters described below, it is the same as the scum prevention device 100 shown in Figures 1 to 5.

[0039] The scum prevention device 100-2 shown in Figure 6 differs from the scum prevention device 100 in that a cleaning device 150 is installed. The cleaning device 150 is installed at multiple locations on the upper part of the suspension support member 110. In Figure 6, two cleaning devices 150 are installed, but it may be installed at only one location, or at three or more locations. The cleaning device 150 is configured by attaching a valve 153 and a nozzle 155 to the end of a water supply pipe 151 that supplies cleaning water. The valve 153 opens and closes the cleaning water supplied to the nozzle 155 manually or automatically. It is more preferable that the valve 153 not only opens and closes, but also allows for manual or automatic adjustment of the amount of opening and closing.

[0040] The nozzle 155 is oriented so that the water supplied from the valve 153 is sprayed toward the water surface in the center well 70. Furthermore, the nozzle 155 is oriented so that the sprayed cleaning water hits the rotating suspension support member 110 as it passes a predetermined position. More specifically, the nozzle 155 is oriented toward the water surface in the center well 110 and toward one of the positions along the movement trajectory of the rotating part of the scum prevention device 100-2.

[0041] The scum prevention device 100-2, with the above configuration, is similar to the scum prevention device 100 described in Figures 1 to 5 above. In the center well 70, relatively easily floating suspended solids (SS) such as flocs entering from the inlet pipe 60 tend to accumulate near the water surface in the center well 70, forming scum. However, since the traveling body 130 of the scum prevention device 100-2 rotates along with the rotation of the rotating shaft 40 from the water surface to a predetermined water depth, the floating SS are stimulated to re-settle by the physical stimulation of direct contact with the traveling body 130 before they can grow into scum, thereby preventing scum formation. Furthermore, scum that has already been generated and is floating is also destroyed by the physical stimulation of direct contact with the traveling body 130, and its re-settlement is promoted.

[0042] Furthermore, in the scum prevention device 100-2, one or more valves 153 are opened to a desired degree at appropriate time intervals (or continuously), either manually or automatically, and cleaning water is sprayed from the nozzle 155 onto the water surface in the center well 70. This physically stimulates and destroys the floating suspended solids and scum. In other words, by spraying cleaning water onto the water surface in the center well 70, the scum destruction and re-settling action by the traveling body 130 can be further promoted.

[0043] Furthermore, a portion of the cleaning water sprayed from the nozzle 155 is sprayed onto the upper surface of the suspension support member 110 when the suspension support member 110 rotates to a predetermined position, and then flows down from the suspension support member 110 along the surface of the traveling body 130. This removes any floating debris that remains attached to the traveling body 130 without settling, allowing it to re-settle and maintaining the scum-breaking performance of the traveling body 130.

[0044] Furthermore, the cleaning water sprayed by the scum prevention device 100-2 reinforces the scum removal and suppression action of the traveling body 130, and the amount of water required is considerably less compared to the conventional method of removing scum using only cleaning water, thus saving water.

[0045] In this scum prevention device 100-2, the direction of the cleaning water sprayed from the nozzle 155 is directed towards the upper surface of the suspension support member 110. However, depending on the state of the effect, the water may be sprayed towards any position along the movement trajectory of the rotating part of the scum prevention device 100-2, such as the diagonally upper surface of the suspension support member 110, the upper part of the traveling body 130, or the suspension part 117.

[0046] Figure 7 is a schematic side cross-sectional view of a scum prevention device 100-3 according to yet another embodiment that enhances the scum removal effect. In the scum prevention device 100-3 shown in the figure, the same or equivalent parts as those in the scum prevention device 100 shown in Figures 1 to 5 are denoted by the same reference numerals. Except for matters described below, it is the same as the scum prevention device 100 shown in Figures 1 to 5.

[0047] The scum prevention device 100-3 shown in Figure 7 differs from the scum prevention device 100 in that it has a traveling body oscillating mechanism 160. The traveling body oscillating mechanism 160 is a projection that protrudes from the inner circumferential surface of the center well 70 and is positioned to contact the side surface of the rotating traveling body 130. That is, the traveling body 130 contacts this traveling body oscillating mechanism 160 once during one rotation and oscillates widely.

[0048] The scum prevention device 100-3, with the above configuration, is similar to the scum prevention device 100 described in Figures 1 to 5 above. In the center well 70, relatively easily floating suspended solids (SS) such as flocs entering from the inlet pipe 60 tend to accumulate near the water surface in the center well 70, forming scum. However, since the traveling body 130 of the scum prevention device 100-3 rotates along with the rotation of the rotating shaft 40 from the water surface to a predetermined water depth, the floating SS are stimulated to re-settle by the physical stimulation of direct contact with the traveling body 130 before they can grow into scum, thereby preventing scum formation. Furthermore, scum that has already been generated and is floating is also destroyed by the physical stimulation of direct contact with the traveling body 130, and re-settlement is promoted.

[0049] Furthermore, in the scum prevention device 100-3, as described above, the traveling body 130 contacts the traveling body oscillating member 160 once during one rotation and oscillates significantly. This allows for the removal of suspended solids (SS) and scum adhering to the traveling body 130, and the large oscillation of the traveling body 130 increases the physical stimulation to the floating SS and scum, thereby more effectively preventing, destroying, and re-settling the scum that forms in the center well 70. In other words, the action and effectiveness of the traveling body 130 can be increased.

[0050] In this scum prevention device 100-3, the traveling body oscillating member 160 is made of a rod-shaped projection, but it may be a plate-shaped body or any other shape. The position in which it contacts the traveling body 130 can also be changed in various ways. Furthermore, it may be configured to contact only a portion of the sagging portion of the traveling body 130, rather than the entire sagging portion. In addition, instead of fixing it to the center well 70, it may be fixed to another stationary member, such as the support column 71.

[0051] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the claims, specification, and drawings. Furthermore, any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of ​​the present invention as long as it achieves the function and effect of the present invention. For example, the above embodiments show an example using a coagulation-sedimentation tank as a solid-liquid separation device, but it can be similarly applied to sedimentation tanks and concentration tanks that normally perform sedimentation. In other words, it can be similarly applied to other types of solid-liquid separation devices as long as they are gravity-type sedimentation separation devices with a scraping device.

[0052] Furthermore, in the above embodiment, a scum scraper consisting of a schema arm or schema blade, etc., for scraping off scum that floats to the surface of the water tank outside the center well is not installed, but such devices may be installed as needed.

[0053] In the above embodiment, a stainless steel chain was used for the running body, but it may be made of other metals or synthetic resins (e.g., FRP or polyvinyl chloride) as long as its specific gravity is 1 or greater. Furthermore, while a chain is preferred as the linear material constituting the running body as described in the above embodiment, a flexible rod-shaped member other than a chain (e.g., a hose or rope) may also be used, or a rigid plate member or rod member may be suspended by a flexible cord so as to be swingable. In addition, instead of one running body, multiple running bodies may be attached to one suspension support member (one mounting seat and one extension member). However, since using multiple running bodies may cause them to entangle with each other or make attachment and detachment difficult, it is more preferable to use only one. Furthermore, the suspension part other than one end of the suspension support member may be used as a fixing suspension part to which the running body may be fixed, or multiple suspension parts may be used as fixing suspension parts to which the running body may be fixed.

[0054] A J-shaped rod member was used as the locking suspension part, but other shapes may also be used. A U-shaped rod member and a shackle were used as the fixing suspension part (anti-detachment device), but other anti-detachment devices of various structures may be used as long as they can lock and secure the vehicle. Furthermore, the anti-detachment device may also be provided on the vehicle side. A mounting seat and an extension member were used as the suspension support member for which the suspension part is attached, but these may also be made up of a single member.

[0055] The embodiments described above and shown in the figures can be combined as long as there is no contradiction in their purpose and structure. Furthermore, even if only a part of the above description and the figures are shown, each can constitute an independent embodiment, and the embodiments of the present invention are not limited to a single embodiment that combines the above description and the figures. [Explanation of symbols]

[0056] 1... Solid-liquid separation device, 10... Water tank, 20... Walkway, 30... Drive device, 40... Rotating shaft, 50... Scraping machine, 60... Inlet pipe, 70... Center well, 100, 100-2, 100-3... Scum prevention device, 110... Suspension support member, 117... Suspension part, 117A... Locking suspension part, 117B... Fixing suspension part (anti-fall device), 117B1... Rod member, 117B2... Shackle, 130... Traveling body, 150... Washing device, 160... Traveling body swinging means.

Claims

1. In a solid-liquid separation device that rotates a scraper installed in a water tank by a rotating shaft, a scum prevention device is installed around the water surface of the rotating shaft to prevent scum from forming in the center well, A suspension part installed on the rotating shaft side within the center well, A traveling body is suspended below the water surface by the aforementioned suspension part, swinging freely so as to sway in accordance with the sloshing generated in the water in the center well, and rotates and moves near the water surface together with the rotation axis, A scum prevention device characterized by having the following features.

2. A scum prevention device according to claim 1, A scum prevention device characterized in that a fall prevention device is provided between the suspension part and the traveling body to prevent the traveling body from falling off the suspension part.

3. A scum prevention device according to claim 1, The scum prevention device is characterized in that the traveling body is detachably suspended from the suspension part.

4. A scum prevention device according to claim 1, The aforementioned traveling body is a flexible linear object, and is a scum prevention device.

5. A scum prevention device according to claim 4, The aforementioned suspension parts are provided at multiple locations. A scum prevention device characterized in that the linear traveling body is suspended from the plurality of suspension parts.

6. A scum prevention device according to any one of claims 1 to 5, A scum prevention device characterized by having a cleaning device that sprays cleaning water toward the water surface in the center well and toward any position in the movement trajectory of the rotating part of the scum prevention device.

7. A scum prevention device according to any one of claims 1 to 5, A scum prevention device characterized by having a traveling body oscillating means installed at a position that contacts and oscillates any part of the rotating traveling body.

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