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 for suppressing and preventing the generation of scum in a center well installed in a solid-liquid separation device.

Background Art

[0002] Conventionally, there has been a solid-liquid separation device (such as a sedimentation tank or a thickening tank) that rotates a scraping machine installed in a water tank by a rotating shaft to scrape sediment (solid content) that has settled and discharge it outside the system. In this type of solid-liquid separation device, a center well for evenly dispersing the raw water (inflow water) to be treated radially in the tank is installed around the water surface near the rotating shaft at the center of the tank.

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

[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 redeposition of the generated scum, or to frequently perform regular scum removal work manually.

[0005] However, a large amount of water is required for the destruction and redeposition of scum by the above high-pressure washing water, and its effect is not sufficient. Also, the frequent manual scum removal work is very complicated.

[0006] In order to solve the above problems, Patent Document 1 discloses a scum removal device including a fixing 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. The rotating plate-like body (22b) constituting the rotating member (22) rotates and travels between the plate-like bodies (21b) constituting the fixing member (21) to crush the scum staying near the water surface in the center well (1) and disperse it under the water surface.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, the scum removal device described in Patent Document 1 has a structure in which large-scale mechanisms such as a fixed member (21) and a rotating member (22) are installed in the center well (1), so the cost is high, and further simplification of the structure has been demanded. In addition, the agitation of water by the rotating plate-like body (22b) applies a strong force to the water, so there is a risk of inhibiting the growth of flocs that can settle in addition to removing scum.

[0009] Also, when sloshing occurs in the water in the center well due to an earthquake or the like, the plate-like body (21b) and the rotating plate-like body (22b) are subject to a large water resistance and may be damaged. If the plate-like body (21b) etc. is damaged by sloshing and its 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 object must be recovered, so a great deal of labor is required for the recovery work. For this reason, damage to the plate-like body (21b) etc. must be surely prevented.

[0010] The present invention has been made in view of the above points, and its object is to provide a scum prevention device that can simplify the structure, effectively prevent the generation, destruction, and redeposition of scum, and further has no risk of being damaged during sloshing.

Means for Solving the Problems

[0011] The present invention relates to a scum prevention device for preventing scum generated in a center well installed around the periphery of a rotating shaft of a solid-liquid separation device that rotationally drives a scraping machine installed in a water tank near the water surface. The scum prevention device is characterized by having a suspension part installed on the rotating shaft side within the center well, and a traveling body that is swingably suspended below the water surface by the suspension part and rotates and travels near the water surface together with the rotating shaft. According to the present invention, since the traveling body that is swingably suspended from near the water surface in the center well to below the water surface rotates and travels, the traveling body directly contacts the scum that is about to accumulate near the water surface in the center well, and the scum can be destroyed and redeposited by physical stimulation. Also, it can directly contact the raw material (SS component) of the scum that is about to be generated and suppress the generation of the scum by its physical stimulation. By these actions, it is possible to effectively prevent the generation, destroy, and redeposit the scum in the center well. Also, since the traveling body is swingably suspended below the water surface, it does not forcibly stir the water, and thus does not inhibit the growth of floc that can settle. Moreover, since the present invention has a configuration in which the traveling body is swingably suspended from the suspension part, the structure can be simplified. Also, since the traveling body is swingably suspended below the water surface, even if sloshing occurs in the water in the center well due to an earthquake or the like, there is no risk of the traveling body being damaged. Also, since it is swingably suspended below the water surface, the operation of suspending the traveling body to the suspension part can be easily performed, and maintenance such as checking the state and cleaning, especially under the water surface, of the suspension part can also be easily carried out.

[0012] In addition to the above features, the present invention is characterized in that a dropout prevention tool for preventing the traveling body from dropping off the suspension part is provided between the suspension part and the traveling body. If the traveling body drops off the suspension part, it will fall to the bottom of the water tank, making its recovery difficult, and not only that, the operation of the solid-liquid separation device will also have to be stopped. However, according to the present invention, such a risk can be reliably prevented.

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

[0014] In addition to the above features, the present invention is characterized in that the traveling body is a linear object having flexibility. A chain is particularly suitable as the linear object. According to the present invention, since the traveling body itself swings when sloshing occurs, it is possible to more effectively prevent the destruction of the scum prevention device. Moreover, since it has flexibility, the operation of suspending the traveling body from the suspension part below can be easily performed. Further, the suspension position of the traveling body can be changed, and maintenance such as checking the state and cleaning of the suspension part, particularly underwater, can be easily performed, and settings such as adjustment of the suspension length can also be easily performed.

[0015] In addition to the above features, the present invention is characterized in that a plurality of the suspension parts are provided, and the linear traveling body is suspended from the plurality of suspension parts. According to the present invention, it is possible to easily increase the substantial number of traveling bodies suspended underwater by a single linear traveling body.

[0016] In addition to the above features, the present invention is characterized in that it has a cleaning device that injects cleaning water toward the water surface in the center well and toward any position in the movement locus of the rotating part of the scum prevention device. According to the present invention, by injecting cleaning water onto the water surface in the center well, the destruction and re-sedimentation of scum by the traveling body can be reinforced and further promoted. Further, since the cleaning water is applied to any part in the movement locus of the rotating part of the scum prevention device, the cleaning water hitting the scum prevention device during rotation flows down along the traveling body, and the floating matter remaining attached to the traveling body can be removed and re-sedimented, and the scum destruction performance of the traveling body can be maintained.

[0017] In addition to the above features, the present invention is characterized in that a traveling body swinging means is installed at a position where it abuts against and swings on any part of the rotating traveling body. According to the present invention, since the traveling body can be forcibly swung by the traveling body swinging means, the physical stimulation to the floating SS and scum can be made stronger within an appropriate range, increasing the action and effect of the traveling body, and more effectively preventing, destroying, and re-settling the scum generated in the center well. Further, when the traveling body abuts against the traveling body swinging means, the floating matter adhering to the traveling body can be removed and re-settled, and the scum destruction performance of the traveling body can be maintained.

Effects of the Invention

[0018] According to the present invention, with a simple structure, it is possible to effectively prevent, destroy, and re-settle scum. It is also possible to prevent it from being destroyed during sloshing.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

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

[0021] The water tank 10 is a coagulation sedimentation tank formed in a circular shape, provided with a concave sediment collection part 11 at the center of its bottom surface, and provided with a treated water drainage gutter 13 near the water surface on the inner peripheral side surface. The scraping machine 50 is configured such that a scraper blade 53 is attached to a scraper arm 51 and rotates integrally with the rotating shaft 40.

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

[0023] The scum prevention device 100 is attached to the rotating shaft 40. FIG. 3 is an enlarged perspective view of a main part seen obliquely upward of a portion near the scum prevention device 100, FIG. 4 is a schematic side sectional view of a portion near the scum prevention device 100, and FIG. 5 is a schematic bottom view of a main part of the scum prevention device 100 with the traveling body 130 and the shackle 117B2 described below removed, seen from below.

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

[0025] The suspension support member 110 includes a pair of mounting seats 111, 111 whose end sides are fixed to the rotating shaft 40, and a pair of extension members 113, 113 respectively attached to the distal ends of the mounting seats 111, 111.

[0026] The pair of mounting seats 111 are flat plate-shaped and are installed so as to protrude in the radially outward direction perpendicular to the rotating shaft 40 and in directions that are 180 degrees different from each other. Four mounting holes (not shown) are provided in two parallel rows on the surface of the mounting seat 111. In this example, the extension member 113 is an L-shaped angle, and one end thereof is fixed by fixing means 115 composed of bolts and nuts using the mounting holes in one row of the mounting seat 111. The suspension support member 110 is constituted by these mounting seats 111 and the extension member 113. Further, two suspension portions 117 (locking suspension portions 117A) made of J-shaped rod members are fixed by fixing means 115 such as nuts so as to hang downward from the lower surface of the mounting seat 111 using the mounting holes in the other row of the mounting seat 111.

[0027] A plurality (three in the example) of hanging parts 117 (two locking hanging parts 117A and one fixing hanging part 117B) are attached to the extension member 113 at substantially equal intervals. The hanging part 117 is composed of two locking hanging parts 117A made of J-shaped bar members and one fixing hanging part 117B composed of a U-shaped bar member 117B1 and a shackle 117B2 connected to the bar member 117B1, which are attached to the lower surface of the extension member 113 made of an L-shaped angle. The bar members 117B1 of the locking hanging part 117A and the fixing hanging part 117B are fixed to the extension member 113 by welding or other fixing means. The locking hanging part 117A (including those fixed to the mounting seat 111) is a detachable hanging tool for detachably hanging the traveling body 130 described below. The fixing hanging part 117B is a fall prevention tool for fixing the traveling body 130 described below. The shackle 117B2 is detachably connected to the U-shaped bar member 117B1, and the traveling body 130 can be connected and fixed to this shackle 117B2.

[0028] In this embodiment, the traveling body 130 uses a stainless steel chain, and one chain is used for each of the pair of hanging support members 110. One end of the traveling body 130 is fixed to the fixing hanging part 117B (its shackle 117B2) of the hanging support member 110, and while slackening by a predetermined length for each J-shaped locking hanging part 117A toward the rotating shaft 40 side, it is hooked in order. At this time, the slackened traveling body 130 is set to a length that can be submerged by a predetermined length (for example, about 10 cm) from above the water surface to below the water surface.

[0029] The straight line connecting the three hanging parts 117 provided on the extension member 113 and the straight line connecting the two hanging tools 117 provided on the mounting seat 111 are shifted in a substantially parallel manner. For this reason, the direction of the traveling body 130 suspended so as to connect between the hanging part 117 on the mounting seat 111 side and the hanging part 117 on the extension member 113 side is installed so as to be inclined obliquely with respect to the direction of the traveling body 130 suspended on both sides thereof. That is, the directions of the traveling bodies 130 on both end sides are made different from the direction of the traveling body 130 at the central portion. By this, when the traveling body 130 is rotated underwater as described below, the state of water stirring can be complicated, and the action and effect described below by the traveling body 130 can be increased.

[0030] In the solid-liquid separation apparatus 1 configured as described above, for example, when the water to be treated (raw water) added with a flocculant flows into the center well 70 from the inflow pipe 60, the water to be treated is evenly dispersed from the lower part of the center well 70 into the external water tank 10, flocculates, and precipitates on the bottom surface of the water tank 10. The precipitated flocs are collected by the scraping machine 50 rotationally driven by the rotating shaft 40 and discharged to the outside of the system through a drain pipe (not shown).

[0031] On the other hand, in the center well 70, among the SS components such as flocs entering from the inflow pipe 60, those that are relatively likely to float accumulate near the water surface in the center well 70 and tend to form scum and accumulate. However, in the present embodiment, since the traveling body 130 of the scum prevention device 100 rotates from the water surface to a predetermined water depth along with the rotation of the rotating shaft 40, the SS components (raw materials for scum) floating near the water surface are promoted to redeposit by the physical stimulation by the direct contact of the traveling body 130 before growing into scum, thereby suppressing and preventing the generation of scum. Also, with respect to the scum that has already been generated and floated, it is destroyed by the physical stimulation by the direct contact of the traveling body 130, and redeposition is promoted. That is, by these actions, it is possible to effectively prevent, destroy, and redeposit scum in 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 break the scum that is trying to grow not only on the water surface but also below the water surface, and can significantly suppress the generation of scum. As a result, compared with the case of removing the scum on the water surface by spraying a large amount of washing water as in the prior art, it is possible to promote the suppression, destruction, and re-sedimentation of scum down to the water surface. That is, the washing water can be made unnecessary or can be greatly saved, and the scum prevention effect can be greatly increased.

[0033] Since the traveling body 130 is swingably suspended below the water surface, it is possible to physically stimulate the floating SS component and scum without forcibly stirring the water, and break them. At the same time, since the water is not forcibly stirred, the growth of sedimentable flocs is not inhibited.

[0034] In addition, since the traveling body 130 is swingably suspended below the water surface, even if sloshing occurs in the water in the center well 70 due to an earthquake or the like, there is no risk of damage because it swings in accordance with the sloshing. In particular, when the traveling body 130 is composed of a linear object having flexibility itself, such as a chain, since the traveling body 130 itself swings when sloshing occurs, it is possible to more effectively prevent damage to the scum prevention device 100. Further, since the traveling body 130 is swingably suspended below the water surface, the hanging operation of the traveling body 130 to the hanging part 117 can be easily performed, and the maintenance such as the state confirmation and cleaning of the hanging part 117, particularly its state below the water surface, can also be easily performed.

[0035] Also, if the traveling body 130 falls off from the hanging part 117 and drops, it will drop to the bottom of the water tank 10, making its recovery difficult, and not only that, the operation of the solid-liquid separation device 1 will also have to be stopped. However, since the traveling body 130 is fixed by the fixing hanging part 117B which is a falling prevention tool, the risk can be surely prevented.

[0036] Note that the fixing hanging part 117B, which is a detachment prevention tool, may be provided at at least one location for one traveling body. The other locking hanging parts 117A of the traveling body 130 are only hung so that they can be easily detached and attached as in the above embodiment. Thus, when inspecting the traveling body 130, the traveling body 130 can be easily removed from the locking hanging tool 117A, and settings such as easily adjusting the hanging length can be performed by appropriately changing the hanging position. As a result of inspecting the traveling body 130, if replacement is necessary due to rust or the like, the traveling body 130 is removed from all the hanging parts 117 and replaced. When detaching and attaching the traveling body 130, for example, if a hanging jig provided with a hooking part such as a J shape at the tip of a long rod is used, it can be hooked on the flexible traveling body 130 (especially a chain), and the traveling body 130 can be easily removed from the hanging part 117 and pulled up above the water surface.

[0037] If a plurality of locations of the flexible linear traveling body 130, such as the chain constituting the traveling body 130, are hung on a plurality of hanging parts 117, the hanging operation of the traveling body 130 on the plurality of hanging parts 117 can be easily performed, and the substantial number of traveling bodies 130 hung underwater by one linear traveling body 130 can be easily increased.

[0038] FIG. 6 is a schematic side sectional view of a scum prevention device 100-2 according to another embodiment with an increased scum removal effect. In the scum prevention device 100-2 shown in the figure, the same reference numerals are given to the same or corresponding parts as those of the scum prevention device 100 shown in FIGS. 1 to 5. Note that matters other than those described below are the same as those of the scum prevention device 100 shown in FIGS. 1 to 5.

[0039] In the scum prevention device 100-2 shown in Fig. 6, the difference from the scum prevention device 100 is that a cleaning device 150 is installed. The cleaning device 150 is installed at a plurality of locations above the suspension support member 110. In Fig. 6, the cleaning device 150 is installed at two locations, but it may be installed at only one location, or may be installed at three or more locations. The cleaning device 150 is configured by attaching a valve 153 and a nozzle 155 to the tip side of a water supply pipe 151 that supplies cleaning water. The valve 153 manually or automatically opens and closes the cleaning water supplied to the nozzle 155. It is more preferable that the valve 153 can not only open and close but also manually or automatically adjust the opening and closing amount.

[0040] The nozzle 155 is oriented in a direction in which the water supplied from the valve 153 side is sprayed toward the water surface in the center well 70. Further, the nozzle 155 is oriented in a direction where the cleaning water sprayed when the rotating suspension support member 110 passes through a predetermined position hits. Furthermore, the nozzle 155 is oriented toward the water surface in the center well 110 and toward any position in the movement locus of the rotating part of the scum prevention device 100-2.

[0041] The scum prevention device 100-2 with the above configuration, similar to the scum prevention device 100 described in Figs. 1 to 5 above, in the center well 70, among the SS components such as floc coming in from the inflow pipe 60, those that are relatively easy to float up accumulate near the water surface in the center well 70 and tend to become scum and accumulate. However, since the traveling body 130 of the scum prevention device 100-2 rotates from above the water surface to a predetermined water depth along with the rotation of the rotating shaft 40, the floating SS components are promoted to redeposit by the physical stimulation caused by the direct contact of the traveling body 130 before they grow into scum, thereby preventing the generation of scum. Also, for the scum that has already been generated and floated, it is destroyed by the physical stimulation caused by the direct contact of the traveling body 130, and redeposition is promoted.

[0042] Furthermore, in the scum prevention device 100-2, one or a plurality of desired valves 153 are manually or automatically opened to a desired opening degree at appropriate time intervals (or continuously), and washing water is sprayed from the nozzle 155 and sprayed onto the water surface in the center well 70. By doing so, physical stimulation is applied to the SS components and scum that have floated up to break them. That is, by spraying washing water onto the water surface in the center well 70, the action of breaking and re-settling the scum by the traveling body 130 can be further promoted.

[0043] In addition, a part of the washing 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 along the surface of the traveling body 130 from the suspension support member 110. By doing so, the floating substances that have not settled and adhered to the traveling body 130 can be removed and re-settled, and the scum breaking performance of the traveling body 130 can be maintained.

[0044] Note that the washing water sprayed in the scum prevention device 100-2 reinforces the scum removal and suppression action by the traveling body 130, and the amount of water is much less than that in the case of removing scum using only washing water as in the conventional case, and it can be saved.

[0045] In this scum prevention device 100-2, the direction of the washing water sprayed from the nozzle 155 is set to the upper surface of the suspension support member 110. However, depending on the state of the action effect, it may be sprayed toward any position in the movement locus of the rotating part of the scum prevention device 100-2, such as the inclined upper surface of the suspension support member 110, the upper part of the traveling body 130, or the suspension part 117.

[0046] FIG. 7 is a schematic side sectional view of a scum prevention device 100-3 according to still another embodiment with an increased scum removal effect. In the scum prevention device 100-3 shown in this figure, the same reference numerals are given to the same or corresponding parts as those of the scum prevention device 100 shown in FIGS. 1 to 5. Note that matters other than those described below are the same as those of the scum prevention device 100 shown in FIGS. 1 to 5.

[0047] In the scum prevention device 100-3 shown in Fig. 7, the difference from the scum prevention device 100 is that a traveling body swinging means 160 is installed. The traveling body swinging means 160 is a protruding body protruding from the inner peripheral surface of the center well 70, and is installed at a position where it contacts the side surface of the rotating traveling body 130. That is, during one rotation of the traveling body 130, it contacts the traveling body swinging member 160 once and swings greatly.

[0048] The scum prevention device 100-3 with the above configuration, similar to the scum prevention device 100 described in FIGS. 1 to 5 above, in the center well 70, among the SS components such as flocs entering from the inflow pipe 60, those that are relatively easy to float accumulate near the water surface in the center well 70 and tend to become scum and accumulate. However, since the traveling body 130 of the scum prevention device 100-3 rotates with the rotation of the rotating shaft 40 from the water surface to a predetermined water depth, the floating SS components are promoted to redeposit by the physical stimulation caused by the direct contact of the traveling body 130 before they grow into scum, thereby preventing the generation of scum. Also, for the scum that has already been generated and floated, it is destroyed by the physical stimulation caused by the direct contact of the traveling body 130, and redeposition is promoted.

[0049] Furthermore, in the scum prevention device 100-3, as described above, during one rotation of the traveling body 130, it contacts the traveling body swinging member 160 once and swings greatly. This can peel off the SS components and scum adhering to the traveling body 130, and by the large swing of the traveling body 130, the physical stimulation to the floating SS components and scum can be strengthened, and the generation prevention, destruction, and redeposition of scum generated in the center well 70 can be carried out more effectively. That is, the action and effect of the traveling body 130 can be increased.

[0050] In this scum prevention device 100-3, the traveling body swing member 160 is configured as a rod-shaped protrusion, but it may be a plate-like body or other various shapes. Also, the position where it contacts the traveling body 130 can be variously changed. Further, instead of contacting all the hanging parts of the traveling body 130, it may be configured to contact a part of the hanging parts. Also, instead of fixing it to the center well 70, it may be fixed to another stationary side member, for example, the support column 71.

[0051] Although the 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 technical idea described in the claims, the specification, and the drawings. Note that any shape, structure, or material not directly described in the specification and the drawings is within the scope of the technical idea of the present invention as long as it exhibits the functions and effects of the present invention. For example, in the above embodiment, an example using a coagulation sedimentation tank as a solid-liquid separation device is shown, but it can be similarly applied to a sedimentation tank or a thickening tank that performs normal sedimentation. That is, as long as it is a gravity sedimentation separation device with a scraping device, it can be similarly applied to other various solid-liquid separation devices.

[0052] Also, in the above embodiment, a scum scraping machine composed of a schema arm, a schema blade, etc., which scrapes the scum floating on the water surface of the water tank outside the center well, is not installed, but these devices may be installed as needed.

[0053] In the above-described embodiment, the traveling body uses a stainless steel chain. However, as long as the specific gravity is 1 or more, it may be made of other metals or synthetic resins (e.g., FRP or vinyl chloride). Also, as the linear member constituting the traveling body, a chain is preferable as described in the above embodiment, but a flexible rod-shaped member other than a chain (e.g., a hose or a wire rope) may be used, or a configuration in which a rigid plate member or rod member is swingably suspended by a flexible string may also be used. Further, instead of one traveling body, a plurality of traveling bodies may be attached to one suspension support member (one mounting seat and one extension member). However, if there are a plurality of them, there is a risk that they may become entangled with each other or the workability of attachment and detachment may deteriorate, so it is more preferable to have one. Also, a suspension part other than one end of the suspension support member may be used as a fixing suspension part and the traveling body may be fixed thereto, or a plurality of suspension parts may be used as fixing suspension parts and the traveling body may be fixed thereto.

[0054] A J-shaped rod member was used as the locking suspension part, but other various shapes may be used. A U-shaped rod member and a shackle were used as the fixing suspension part (anti-drop tool), but other various structures of anti-drop tools may be used as long as they can lock and fix the traveling body. Further, the anti-drop tool may be provided on the traveling body side. A mounting seat and an extension member were used as the suspension support member for providing the suspension part, but these may be constituted by one member.

[0055] The above-described embodiments shown in the description and the drawings can be combined with each other's description contents as long as there is no contradiction in their purposes and configurations, etc. Also, the description contents in the above description and each drawing, even if they are a part thereof, can each be an independent embodiment, and the embodiments of the present invention are not limited to one embodiment combining the above description and each drawing.

Explanation of Signs

[0056] 1…Solid-liquid separation device, 10…Water tank, 20…Corridor, 30…Drive device, 40…Rotating shaft, 50…Scraper, 60…Inflow pipe, 70…Center well, 100, 100-2, 100-3…Skim prevention device, 110…Suspension support member, 117…Suspended part, 117A…Locking suspended part, 117B…Fixing suspended part (anti-detachment tool), 117B1…Rod member, 117B2…Shackle, 130…Traveling body, 150…Cleaning device, 160…Traveling body swing means.

Claims

1. In a scum prevention device for preventing scum generated in a center well installed around the periphery of a rotating shaft of a solid-liquid separation device that rotationally drives a scraping machine installed in a water tank by a rotating shaft, a suspension part installed on the rotating shaft side within the center well; a traveling body that is swingably suspended below the water surface by the suspension part and rotates and travels near the water surface together with the rotating shaft; A scum prevention device characterized by comprising the above.

2. The scum prevention device according to Claim 1, wherein a dropout prevention tool for preventing the traveling body from dropping off from the suspension part is provided between the suspension part and the traveling body.

3. The scum prevention device according to Claim 1, wherein the traveling body is detachably suspended from the suspension part.

4. The scum prevention device according to Claim 1, wherein the traveling body is a flexible linear object.

5. The scum prevention device according to Claim 4, wherein the suspension part is provided at a plurality of locations, and the linear traveling body is suspended from the plurality of suspension parts.

6. The scum prevention device according to any one of Claims 1 to 5, 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 locus of the rotating part of the scum prevention device.

7. The scum prevention device according to any one of Claims 1 to 5, characterized in that a traveling body swing means is installed at a position where it abuts against and swings any part of the rotating traveling body.

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