JP6282777B1 - Sludge scraper, flight and shoe - Google Patents

Abstract

A flight drop is reliably prevented without complicating the structure, complicating exchange work, and increasing costs. SOLUTION: A flight 4 is attached to a chain 3 disposed so as to be wound endlessly in a sludge sedimentation basin P and swung around the bottom surface of the sludge sedimentation basin P. A sludge scraping body 5 is configured, and both ends of the flight 4 in the longitudinal direction of the flight 4 intersecting the traveling direction of the sludge scraping body 5 penetrate the flight 4 in the traveling direction of the sludge scraping body 5. Concave grooves 4a are formed at both end faces of the flight 4, and a pair of support rails 11 installed in the sludge settling basin P and extending in the traveling direction are inserted into the concave grooves 4a. The flight 4 travels while at least one of a pair of groove wall surfaces of the concave groove 4 a facing each other is in sliding contact with the support rail 11. [Selection] Figure 4

Description

  The present invention relates to a sludge scraping machine that scrapes sludge accumulated on the bottom of a sludge sedimentation basin such as a sewage treatment plant, a flight used in the sludge scraping machine, and a shoe attached to the flight.

  As such a sludge scraper, the inventors of the present invention disclosed in Patent Document 1 that a flight extending in a lateral direction travels in a traveling direction perpendicular to the longitudinal direction from the bottom of the sludge settling basin to the water surface. This is a sludge scraping machine that scrapes the sludge accumulated at the bottom of the pond, and the upper rail is laid along the flight direction on the water surface of the sludge sedimentation pond, and the flight travels around the flight. A chain connecting member to be connected to the chain to be attached is attached, and in the water surface portion, the flight places the upper edge of the flight above the water surface of the sludge settling basin in the water surface portion, and the scum floating on the water surface portion is While traveling on the upper rail while scraping, the water surface is separated from the upper rail by flying up on both sides of the flight in the longitudinal direction. Guide rails to be stopped are located below the water surface of the sludge settling basin in the water surface portion and are laid in the traveling direction, and convex portions projecting in the longitudinal direction are provided at both ends in the longitudinal direction of the flight. As for the water surface portion, it has been proposed that the upper surface portion of the convex portion is opposed to the lower surface of the guide rail.

  In such a sludge scraper, the water surface of the treated water held in the sludge settling basin can be largely prevented by the guide rails from falling off the upper rail of the flight due to so-called sloshing, which occurs during an earthquake. At the same time, the corrosion of the guide rail can be suppressed and the replacement frequency can be reduced. Patent Document 2 also proposes a sludge scraper equipped with a flight and a stopper structure between the rails for preventing the flight from dropping off from the rail for the purpose of preventing the flight from dropping off.

Japanese Patent No. 5613458 JP 2011-005400 A

  However, the sludge scraper described in these Patent Documents 1 and 2 requires a guide rail and a stopper structure in addition to the upper rail and flight shoe, which complicates the structure of the rail and flight and reduces the cost. It is inevitable that this will increase. In addition, since the guide rail and stopper structure are immersed in the treated water, corrosion by hydrogen sulfide gas generated from the treated water can be avoided, but the guide rail and stopper structure must also be replaced according to the rail and flight replacement period. In other words, the replacement work becomes complicated and the cost increases.

  The present invention has been made under such a background, and the sludge scraping that can reliably prevent the flight from dropping off without complicating the structure, complicating the replacement work, and increasing the cost. It is an object to provide a machine, a flight used in the sludge scraper, and a shoe attached to the flight.

  In order to solve the above-mentioned problems and achieve such an object, the sludge scraper of the present invention is arranged so as to be wound endlessly in the sludge settling basin and is made to run around the chain, A flight for scraping sludge accumulated on the bottom surface of the sludge sedimentation basin is attached to form a sludge scraping body, and at both ends of the flight in the longitudinal direction of the flight intersecting the traveling direction of the sludge scraping body In addition, concave grooves that pass through the flight in the traveling direction and open to both end faces of the flight are formed, and these concave grooves are installed in the sludge settling basin and extend in the traveling direction. Support rails are respectively inserted, and the flight travels while at least one of the pair of groove wall surfaces of the concave groove facing each other is in sliding contact with the support rail. Further, the flight of the present invention is a flight used in such a sludge scraper, and concave grooves are formed in both end portions in the longitudinal direction so as to penetrate in the traveling direction and open on both end surfaces. It is characterized by that.

  In the sludge scraper configured in this way, the support rails installed in the settling basin are inserted into the concave grooves formed at both ends of the flight, and these flights support the flight vertically and horizontally. Travel while being supported by (the longitudinal direction of the flight). For this reason, it is possible to prevent the flight from dropping off due to sloshing during an earthquake or shaking of the treated water in the sludge settling basin.

  Unlike the guide rail described in Patent Document 1 and the stopper structure described in Patent Document 2, at least one of the pair of groove wall surfaces facing each other is used as the support rail. Since the flight travels while sliding, there is no need for a guide rail in addition to a support rail or a stopper structure in addition to a concave groove, making the structure complicated and the replacement work complicated This will not increase the cost.

  That is, when the specific gravity of the sludge scraper composed of the chain and the flight is heavier than the specific gravity of the treated water, the upper groove wall surface of the pair of groove walls facing each other of the concave grooves at both ends of the flight is supported. Run while sliding on the rail. In the case of a levitating sludge scraping machine in which the specific gravity of the sludge scraper consisting of the chain and the flight is lighter than the specific gravity of the treated water and the sludge scraping floats in the treated water, The lower groove wall surface of the pair of groove wall surfaces facing each other in the concave groove travels while being in sliding contact with the support rail. Of course, in either case, both of the pair of groove wall surfaces of the recessed groove may be in sliding contact with the support rail.

  Therefore, this support rail is installed on the lower side of the sludge sedimentation basin and the lower rail on which the flight travels when scraping the sludge, and the upper rail installed on the upper side of the sludge sedimentation basin and the flight travels around. By using at least one of them, the flight can be stably performed without requiring the guide rail described in Patent Document 1 or the stopper structure described in Patent Document 2, and the sludge scraper. It does not lead to complication of the structure. Further, it is not necessary to replace the guide rail and the stopper structure in accordance with the replacement of the flight, the lower rail, and the upper rail, so that the replacement work can be easily performed and the cost can be reduced.

  In order to prevent flight wear due to the direct contact of the flight with the support rail, shoes may be attached to both ends of the flight so that the shoe is in sliding contact with the support rail. desirable. That is, the shoe of the present invention is a shoe attached to the flight of the present invention, and is characterized by being capable of sliding contact with the support rail. In this case, the concave groove of the flight is formed so as to penetrate the shoe attached to both ends of the flight, and the groove wall surface that is in sliding contact with the support rail among the pair of groove wall surfaces of the concave groove is attached to the shoe. What is necessary is just to protrude the formed part inside the groove width direction of a ditch | groove rather than the part in which the flight was formed.

  In addition, as in the case of the above floating type sludge scraper, the sludge scraper composed of chains and flights is lighter than the specific gravity of treated water. In the case where the support rail is an upper rail installed on the upper side in the sludge settling basin, the traveling path of the sludge scraping body on the upper side in the sludge settling pond has the above-mentioned in the treated water. When a chain tension region that allows the sludge scraping body to float is provided, above the end of the upper rail on the chain tension region side, in the running direction of the sludge scraping body on the upper side in the sludge sedimentation basin. It is desirable that a flight guide extending upward as it goes.

  By attaching such a flight guide, both ends of the flight that has slipped in the upper travel direction from the end of the upper rail with the treated water introduced into the sludge settling basin are in sliding contact with the lower surface of the flight guide. As it is being guided, it will rise smoothly in the chain tension area. Therefore, since the flight that has escaped from the end of the upper rail does not rise suddenly, the chain connected to the flight is not lifted at a steep angle, and an excessive load is not applied. It is possible to prevent the chain from being vibrated or damaged by a heavy load.

  On the other hand, to arrange the sludge scraper chain so as to be wound endlessly in the sludge sedimentation basin, the sprocket around which the chain is wound can be rotated at the end of the support rail. However, a guide rail extending in an arc shape around the rotation axis of the sprocket is provided at least on the end of the support rail opposite to the traveling direction, and the guide rail is connected to the flight. By inserting into the concave groove, the flight can be guided by the guide rail thus inserted into the concave groove, and the flight concave groove can be surely inserted into the support rail, and the flight can be prevented from dropping off. it can.

  In this case, the distance between the guide rail and the support rail is at least the end opposite to the travel direction, and the support rail is separated from the end opposite to the travel direction. A guide rail is provided in the concave groove of the flight by providing a thin-walled portion in which the thickness in a direction in which the pair of groove wall surfaces of the concave groove face each other is thin, and making the guide rail thinner than the support rail. Can be reliably inserted, and the flight can be smoothly guided. Further, when the support rail includes an upper rail installed on the upper side and a lower rail installed on the lower side in the sludge settling basin, the end portions of the upper rail and the lower rail are By connecting with the guide rail, it is possible to guide the flight to the support rail more reliably without dropping off.

  As described above, according to the present invention, there is no need for a guide rail other than the support rail or a stopper structure other than the concave grooves at both ends of the flight, and the flight of the flight due to the sloshing during the earthquake or the shaking of the treated water is not required. It is possible to prevent dropping off, simplifying the structure of the sludge scraping machine and facilitating the replacement work of the rail and flight, and promoting the stable sludge scraping at low cost.

It is a longitudinal cross-sectional view of the sludge sedimentation basin which shows the 1st Embodiment of this invention. It is AA expanded sectional drawing in FIG. It is BB expanded sectional drawing in FIG. FIG. 4 is an enlarged view of a left lower rail portion and a support rail portion in FIG. 3. It is (a) front view of the flight of embodiment shown in FIG. 1, (b) CC sectional drawing in figure (a), (c) DD sectional drawing in figure (a). In the embodiment shown in FIG. 1, (a) a side view of the flight passing through the upper rail in a state where treated water is not introduced into the sludge settling basin, (b) in a state where treated water is introduced into the sludge settling pond FIG. In the embodiment shown in FIG. 1, (a) a side view of a flight passing through the lower rail in a state where treated water is not introduced into the sludge settling basin, (b) in a state where treated water is introduced into the sludge settling pond. FIG. In the embodiment shown in FIG. 1, (a) a side view of the flight passing through the support rail in a state where treated water is not introduced into the sludge settling basin, (b) in a state where treated water is introduced into the sludge settling pond. (However, the attachment is not shown). FIG. 6A is an enlarged view corresponding to the right end portion in FIG. 5A, showing a first modification of the shoe in the embodiment shown in FIG. 1, and FIG. 5B is a view corresponding to FIG. Attachment is not shown.) FIG. 6A is an enlarged view corresponding to the right end portion in FIG. 5A, showing a second modification of the shoe in the embodiment shown in FIG. 1, and FIG. 5B is a view corresponding to FIG. Attachment is not shown.) (A) An enlarged view corresponding to the right end portion in FIG. 5 (a) showing a third modification of the shoe in the embodiment shown in FIG. 1, (b) a view corresponding to FIG. 5 (b) (however, Attachment is not shown.) (A) An enlarged view corresponding to the right end portion in FIG. 5 (a), and (b) a view corresponding to FIG. 5 (b), showing a modification of the flight and a fourth modification of the shoe in the embodiment shown in FIG. (However, the attachment is not shown). (A) An enlarged view corresponding to the right end portion in FIG. 5 (a), and (b) a view corresponding to FIG. 5 (b), showing a modified example of the flight and a fifth modified example of the shoe in the embodiment shown in FIG. (However, the attachment is not shown). FIG. 1 (a) is an enlarged view corresponding to the right end portion in FIG. 5 (a), and FIG. 5 (b) is a view corresponding to FIG. 5 (b). (However, the attachment is not shown). (A) An enlarged view corresponding to the right end portion in FIG. 5 (a), and (b) a view corresponding to FIG. 5 (b), showing a modified example of the flight and a seventh modified example of the shoe in the embodiment shown in FIG. (However, the attachment is not shown). It is a longitudinal cross-sectional view of the sludge sedimentation basin which shows the 2nd Embodiment of this invention. It is AA expanded sectional drawing in FIG. It is BB expanded sectional drawing in FIG. It is an enlarged view of the lower rail part and support rail part of the left side in FIG. (A) Front view of flight of embodiment shown in FIG. 16, (b) CC sectional drawing in figure (a), (c) DD sectional drawing in figure (a). FIG. 17 is a side view of a flight passing through the upper rail in the embodiment shown in FIG. 16. FIG. 17 is a side view of a flight passing through the lower rail in the embodiment shown in FIG. 16. In embodiment shown in FIG. 16, it is a side view of the flight which passes a support rail (however, an attachment is abbreviate | omitted illustration). FIGS. 1 and 16 show a first modification of the first and second embodiments, (a) an enlarged view around the left sprocket in FIGS. 1 and 16 (however, the support rail is not shown), (B) It is an enlarged view around the sprocket on the right side in FIG. 1 (however, the lower rail is not shown). FIGS. 1 and 16 show a second modification of the first and second embodiments, (a) an enlarged view around the left sprocket in FIGS. 1 and 16 (however, the support rail is not shown), (B) It is an enlarged view around the sprocket on the right side in FIG. 1 (however, the lower rail is not shown). FIG. 7 is an enlarged view of the vicinity of the right sprocket in FIG. 1, showing a third modification of the first embodiment shown in FIG. 1.

  1 to 8 show a first embodiment of the present invention. The sludge sedimentation basin P in which the sludge scraper of this embodiment is installed has a horizontal bottom surface Q that is rectangular in plan view, and rises in a direction perpendicular to the bottom surface Q and extends in the longitudinal direction of the rectangle. A pair of long wall surfaces R that are parallel to each other and a pair of short wall surfaces S that are perpendicular to the long wall surfaces R and the bottom surface Q and are opposed to the longitudinal direction are formed. The side of the wall surface S (the right short wall surface S in FIG. 1) is made deeper, and is defined as a waste mud pit T from which the sludge scraped is discharged. In addition, the inclined surface U which inclines so that it may mutually approach as it goes to the bottom face Q side is formed in the corner part where a pair of long wall surface R cross | intersects the bottom face Q.

  As shown in FIG. 1, the position immediately above the boundary between the bottom surface Q and the mud pit T and the bottom surface Q on the other short wall surface S (the short wall surface S on the left side in FIG. 1) of the pair of short wall surfaces S. As shown in FIG. 2, sprocket support shafts 1 are provided so as to be coaxially projected from both long wall surfaces R at respective positions so as to be rotatable. Is equipped with a sprocket 2. In the present embodiment, the two sprockets 2 on the other short wall surface S side are attached to the sprocket support shaft 1 and cantilevered independently of each other, whereas the two sprockets 2 on the mud pit T side are supported. As shown in FIG. 2, it is connected to one sprocket support shaft 1 so as to be integrally rotatable.

  Here, the pair of sprockets 2 positioned on the respective sides of the pair of long wall surfaces R are positioned on one vertical plane spaced from each long wall surface R, and the pair of sprockets 2 includes The chains 3 are respectively wound so as to be wound endlessly in the same vertical plane. The lengths of these chains 3 are equal to each other, and are longer than the length when the chain is wound around the pair of sprockets 2 without slack. Furthermore, the sprocket 2 and the chain 3 are formed of a resin material such as reinforced polyester resin or polyacetal resin.

  Further, the pair of chains 3 positioned on both long wall surfaces R side in this way are strengthened so as to extend between the two chains 3 perpendicular to the vertical surface on the outside of the ring formed by the wound chain 3. A flight 4 formed in a long plate shape by a resin material such as polyester resin or polyacetal resin is bridged, and both ends thereof are respectively connected to a pair of chains 3 via an attachment 3a made of the same resin material. ing.

  2 and 3, the flight 4 has a length in a direction perpendicular to the vertical plane (longitudinal direction of the flight 4) longer than the interval between the pair of chains 3, and the sloping surface of the sludge settling basin P. The length is slightly smaller than the width of the bottom surface Q between U. By arranging a plurality of such flights 4 along the pair of chains 3 at equal intervals, the sludge scraping body 5 in the present embodiment is configured.

  Further, in a total of four sprockets 2, a drive sprocket 6 is attached to a sprocket support shaft 1 that connects and supports two sprockets 2 arranged on the mud pit T side. Furthermore, the drive sprocket 6 is connected to a rotation shaft of a drive device 7 provided on the sludge sedimentation basin P via a drive chain 8, and the drive sprocket 6 is rotated by rotating the rotation shaft of the drive device 7. The sprocket 2 connected to the 6 through the sprocket support shaft 1 also rotates in a predetermined direction (counterclockwise direction in FIG. 1) around the axis.

  Therefore, in the present embodiment, the driving device 7 is driven in this manner to rotate the two sprockets 2 on the side of the mud pit T integrally in a predetermined direction, thereby winding the sprocket 2 on the side of the mud pit T. The chain 3 that is hung is synchronously rotated in the same traveling direction F as the predetermined direction in the vertical plane while the remaining two sprockets 2 on the other short wall surface S side are driven to rotate. Accordingly, the flight 4 travels in the same traveling direction F.

  Further, the flight 4 in the present embodiment has a cross section perpendicular to the longitudinal direction thereof, as shown in FIGS. 5B and 5C, on the inner peripheral side of the chain 3 (lower in FIGS. 5A to 5C). The portion located on the outer peripheral side of the chain 3 (the upper side in FIGS. 5A to 5C) extends to the side opposite to the running direction F so that the portion located on the side) extends in the running direction F side. Each of the plates is bent, and the central portion between these portions is a plate material having a substantially Z-shaped cross section perpendicular to the traveling direction F.

  Further, the chain 4 extends from the surface of the both ends of the flight 4 facing toward the outer side of the chain 3 from the surface facing the traveling direction F of the center toward the opposite side of the traveling direction F of the center of the both ends. A pair of shoes 9 having a L-shaped cross section made of a resin material such as nylon are attached to the center of the flight 4 by bolting to the surface facing the inner peripheral side of the air conditioner 3. Here, in the present embodiment, the pair of shoes 9 are arranged so that the flights 4 overlap each other at the center of the flight 4 and sandwich the center of the flight 4 with two bolts together. It is attached as follows.

  Furthermore, a plurality of floats 10 made of resin foam such as vinyl chloride resin are spaced apart in the longitudinal direction of the flight 4 on the surface of the flight 4 facing away from the traveling direction F at the center. It is attached. Due to the buoyancy caused by these floats 10, the sludge scraping body 5 composed of the chains 3 and the flights 4 can float in the treated water W introduced into the sludge settling basin P in this embodiment.

  Further, at both ends in the longitudinal direction of the center part of the flight 4, the book 4 penetrates through the shoes 9 attached to both side surfaces of the flight 4 and opens at both end surfaces facing the longitudinal direction of the flight 4. In the embodiment, a U-shaped groove 4a is formed as shown in FIG. 5A when viewed from the direction facing the central portion. Here, the concave groove 4 a is formed so that the portion formed in the shoe 9 is slightly smaller than the portion formed in the flight 4, and the chain 3 of the concave groove 4 a in the portion formed in the flight 4. The groove wall surface facing the inner and outer peripheral side of the chain 3 of the groove 4a in the portion formed in the shoe 9 is projected from the groove wall surface facing the inner and outer peripheral side.

  And on the bottom Q side of the sludge sedimentation basin P, as a support rail in this embodiment, a pair of lower rails 11 respectively inserted into the concave grooves 4a at both ends of these flights 4 are provided between the pair of sprockets 2. A lower portion is provided so as to extend horizontally along the longitudinal direction of the bottom surface Q of the sludge settling basin P with a space from the bottom surface Q. In addition, above these lower rails 11 above the portion on the side of the sludge pit T, sludge on the upper side of the sludge settling basin P from above the sprocket 2 on the side of the sludge pit T in parallel with each lower rail 11 and at equal intervals. A pair of upper rails 12 extending horizontally on the side opposite to the traveling direction F of the scraper 5 are also provided as support rails in the present embodiment. Note that at least end portions of these supporting rails (the lower rail 11 and the upper rail 12) on the side opposite to the traveling direction F are the first and second embodiments shown in FIGS. The thin portions 22 and 23 in the first to third modifications may be provided.

  In the present embodiment, the lower rail 11 and the upper rail 12 are made of a metal material such as stainless steel, and are each in the shape of a pipe having a circular cross section, and are spaced in the traveling direction F as shown in FIG. Further, as shown in FIGS. 2 to 4, the sludge sedimentation basin P is attached to and supported by a plurality of support members 13 provided from the long wall surface R to the inclined surface U. On the other hand, in the region on the opposite side of the sludge pit T where the upper rail 12 is not provided, the sludge scraper 5 consisting of the chain 3 and the flight 4 that can float in the treated water W is shown by a chain line in FIG. As shown, the chain tension region is wound around the sprocket 2 on the side opposite to the sludge pit T, and this region allows the sludge scraper 5 to float in the treated water W in this embodiment. X.

  Further, in this chain tension region X, a pair of support rails 14 that slidably support the flight 4 are provided on the pair of long wall surfaces R side of the sludge settling basin P with a space above the lower rail 11, respectively. It has been. These support rails 14 are also formed of a metal material such as stainless steel, and are supported by the support member 13 so as to extend horizontally downward slightly from the upper rail 12.

  However, this support rail 14 is formed in a long flat plate shape, and is supported with its thickness direction directed up and down. Moreover, as shown in FIG. 1, the end of the upper rail 12 on the sludge sedimentation basin P side on the running direction F side and the end of the support rail 14 on the sludge sedimentation basin P side opposite to the running direction F are as shown in FIG. 1. It extends so as to slightly overlap in the traveling direction F and is supported by the support member 13.

  Further, a flight guide 15 is attached to a support member 13 that supports the end of the overlapping upper rail 12 and the end of the support rail 14. The flight guide 15 is formed in a plate shape with a metal material such as stainless steel like the support rail 14, and the end on the opposite side of the traveling direction F on the sludge sedimentation basin P is slightly above the upper rail 12. In this embodiment, as it goes from the end portion toward the traveling direction F, it extends toward the upper side while curving downward.

  The lower rail 11, the upper rail 12, the support rail 14, and the flight guide 15 are each one vertical position located slightly outside the vertical plane on which the sprocket 2 is located at both ends in the longitudinal direction of the flight 4. Located on the surface, the lower rail 11 and the upper rail 12 can be inserted into the concave groove 4a of the flight 4, and when the lower rail 11 is inserted into the concave groove 4a, as shown in FIG. A slight gap is provided between the lower edge of 4 and the bottom surface Q of the sludge settling basin P. Further, the support rail 14 and the flight guide 15 can be slidably contacted with shoes 9 attached to both ends bent from the center of the flight 4.

  In the sludge scraping machine configured as described above, when the sewage sludge accumulated on the bottom surface Q in the state where the treated water W such as sewage is introduced into the sludge settling basin P, the driving device 7 If the sprocket 2 is rotated in the traveling direction F by rotating the sprocket 2 via the drive chain 8, the drive sprocket 6, and the sprocket support shaft 1, the sludge scraper on the bottom surface Q side of the sludge sedimentation basin P 5, the flight 4 is sequentially delivered so that the lower rail 11 is inserted into the concave grooves 4 a at both ends of the flight 4 from the sprocket 2 on the side opposite to the mud pit T. As described above, a slight gap is provided between the bottom surface Q and the sludge accumulated above the gap portion is scraped and discharged to the drainage pit T.

  In addition, when the sludge scraping body 5 travels on the lower travel route with the treated water W introduced into the sludge sedimentation basin P in this way, buoyancy is given to the flight 4, and therefore the concave groove 4a. In the lower rail 11 inserted into the portion of the groove wall surface of the groove 4a located on the outer peripheral side (lower side in FIG. 7) of the chain 3 as shown in FIG. A portion formed on the shoe 9 that is made slightly smaller than the slidable portion comes into sliding contact.

  Next, the flight 4 that has squeezed and discharged the sludge is wound around the sprocket 2 on the side of the sludge pit T, moves to the traveling path above the sludge scraper 5 in the sludge settling basin P, and enters the groove 4a. The upper rail 12 is fed out so as to be inserted and travels toward the opposite side of the mud pit T. At this time, since the buoyancy is given to the flight 4, the upper rail 12 inserted into the concave groove 4 a has an inner peripheral side (lower side in FIG. 6) of the chain 3 as shown in FIG. Of the groove wall surface of the concave groove 4a located at (4), the portion formed on the shoe 9 that is slightly smaller than the portion formed on the flight 4 comes into sliding contact.

  Further, from the point where the upper rail 12 is interrupted to the point where the sludge scraping body 5 floats in the treated water W in the chain tension region X and is wound around the sprocket 2 on the side opposite to the drainage pit T again. Thus, a predetermined tension is applied to the chain 3. Therefore, a separate device for applying tension to the chain is not required, and the frequency of work for adjusting the tension of the chain can be reduced. At this time, the sludge scraping body 5 extends upward from the upper rail 12 toward the central portion of the chain tension region X as shown by a chain line in FIG. As shown in FIG. 8B, a space is provided between the flight 4 and the support rail 14 so as to extend downward toward the opposite sprocket 2.

  On the other hand, when such a sludge scraper is initially installed in the sludge sedimentation basin P or when the sludge scraper is repaired, in the empty state where the treated water W is not introduced into the sludge sedimentation basin P, the sludge scraper is removed. The collaborator 5 descends by its own weight without buoyancy, and in this embodiment, the flight 4 located in the upper rail 12 portion of the upper travel path is the outer periphery of the chain 3 as shown in FIG. Of the groove wall surface of the concave groove 4 a located on the side (upper side in FIG. 6), the portion formed on the shoe 9 is in sliding contact and suspended from the upper rail 12.

  Further, in this state, the flight 4 located on the lower travel route is, as shown in FIG. 7A, of the groove wall surface of the concave groove 4a located on the inner peripheral side (upper side in FIG. 7) of the chain 3. A portion formed on the shoe 9 is in sliding contact with the lower rail 11. Even at this time, a space is provided between the flight 4 located on the lower travel route and the bottom surface Q of the sludge settling basin P as shown in FIG.

  Further, in a state where the treated water W is not introduced into the sludge settling basin P, the sludge scraper 5 located in the chain tension region X supports the flight 4 in a slidable manner in the chain tension region X. Since the support rail 14 is provided above the lower rail 11 with a gap, in the present embodiment, the chain 3 of the shoe 9 attached to both ends of the flight 4 as shown in FIG. When the shoe 9 located on the inner peripheral side (lower side in FIG. 8) contacts the support rail 14, the flight 4 is slidably supported. At this time, the chain 3 of the sludge scraping body 5 is supported so as to hang down inside the pair of support rails 14 by its own weight.

  Thus, in the sludge scraping machine having the above-described configuration, the lower rail 11 and the upper rail 12 that are support rails can be inserted into the concave grooves 4a formed at both ends of the flight 4, and the sludge sedimentation basin. Whether the treated water W is introduced into the P or the treated water W is not introduced, the flight 4 has at least one of the groove wall surfaces of the recessed groove 4a sliding on the lower rail 11 and the upper rail 12. The other is capable of coming into contact with the lower rail 11 and the upper rail 12 while being in contact with each other, and travels while being sandwiched between the pair of lower rails 11 or the upper rails 12 in the longitudinal direction of the flight 4.

  Therefore, since the flight 4 is supported by the lower rail 11 or the upper rail 12 in the vertical direction and the horizontal direction (longitudinal direction of the flight 4), even when the treated water W is introduced or not introduced, If the sludge scraping body 5 vibrates vigorously due to sloshing or shaking of the treated water W when an earthquake occurs in the area where the sludge sedimentation basin P is provided, the flight 4 falls off from the lower rail 11 and the upper rail 12. Can be prevented. By appropriately setting the groove width of the concave groove 4a and the diameters of the lower rail 11 and the upper rail 12, both the pair of groove wall surfaces of the concave groove 4a are in sliding contact with the lower rail 11 and the upper rail 12. Also good.

  Moreover, in this embodiment, the support rails are installed on the lower side of the sludge settling basin P, and when the sludge is scraped, the lower rail 11 on which the flight 4 travels and the sludge settling basin P Since the upper rail 12 is installed on the upper side and travels around the flight 4, the flight 4 can travel stably without requiring the guide rail described in Patent Document 1 or the stopper structure described in Patent Document 2. It becomes possible to make it. For this reason, the structure of the sludge scraper is not complicated, and it is not necessary to replace the guide rail and the stopper structure in accordance with the replacement of the flight 4, the lower rail 11, and the upper rail 12. This can be easily performed and the cost can be reduced.

  Further, in the present embodiment, the concave grooves 4 a formed at both ends of the flight 4 are formed on the shoe 9 rather than the groove wall surface facing the inner and outer peripheral side of the chain 3 of the concave groove 4 a in the portion formed in the flight 4. Since the groove wall surface facing the inner and outer peripheral sides of the chain 3 of the groove 4a in the formed portion protrudes, the shoe 9 is in sliding contact with the lower rail 11 and the upper rail 12 even in the groove 4a. It becomes the formed part.

  For this reason, it is possible to prevent the flight 4 from being directly worn by sliding contact with the lower rail 11 and the upper rail 12, and to extend the life of the flight 4 and the sludge scraping body 5, and by extension, the sludge scraping machine. it can. In addition, in this embodiment, the shoe 9 is made of a resin material such as nylon and is detachably attached to the flight 4 by bolting or the like. Therefore, when the shoe 9 is worn, the bolt is removed. Only the shoe 9 needs to be replaced, which is efficient and economical.

  In this embodiment, the concave groove 4a is formed in a U shape that opens at both end faces in the longitudinal direction of the flight 4, and the lower rail 11 and the upper rail 12 are formed in a pipe shape having a circular cross section. Such pipe-like lower rail 11 and upper rail 12 are inserted as close to the bottom surface of the U-shaped concave groove 4a as shown in FIG. It may be formed so as to open in a “U” shape at both end faces of the flight 4, and the lower rail 11 and the upper rail 12 may be inserted into the concave groove 4 a as pipes having a square cross section.

  Further, in the present embodiment, as described above, both the lower rail 11 and the upper rail 12 can be inserted into the recessed grooves 4a formed at both ends of the flight as support rails. Any one of the rails, for example, a floating sludge scraper described in Japanese Patent No. 5743527, slides the shoe 9 of the flying flight 4 from the lower side to the lower rail 11 or the upper rail 12. You may make it touch and prevent the sludge scraping body 5 from rising. However, in order to reliably prevent the flight from dropping off in the event of an earthquake, both the lower rail 11 and the upper rail 12 can be inserted into the recessed grooves 4a formed at both ends of the flight 4 as support rails as in this embodiment. Of course, it is desirable.

  Furthermore, the sludge scraping machine of the present embodiment is a floating sludge scraping machine in which the sludge scraping body 5 can float in the treated water W in the sludge settling basin P as described above. The upper rail 12 installed on the upper side in the sedimentation basin P is used as a support rail, and the sludge scraping body in the treated water W is disposed on the traveling path of the sludge scraping body 5 on the upper side in the sludge sedimentation basin P. A chain tension region X that allows the floating of the sludge 5 is provided, and the sludge scraper 5 on the upper side in the sludge settling basin P is above the end of the upper rail 12 on the chain tension region X side. A flight guide 15 extending upward in the direction F is attached.

  For this reason, the flight 4 that has escaped from the above end of the upper rail 12 in the upper traveling direction F with the treated water W introduced into the sludge settling basin P has the shoes 9 facing the outer periphery of the chain 3 at both ends thereof. As a result of being guided while being in sliding contact with the lower surface of the flight guide 15, the air will smoothly float in the chain tension region X. Accordingly, since the flight 4 that has come out from the end of the upper rail 12 does not rise rapidly, the chain 3 connected to the flight 4 is pulled up at a steep angle, and an excessive load does not act. Such an excessive load can prevent the chain 3 from being vibrated or damaged.

  On the other hand, in the present embodiment, the sludge scraper 5 located in the chain tension region X is in flight to the chain tension region X in the state where the treated water W is not introduced into the sludge settling basin P as described above. As shown in FIG. 8 (a), of the shoes 9 attached to both ends of the flight 4, support rails 14 that slidably support 4 are provided above the lower rail 11 with a space therebetween. Further, the shoe 9 located on the inner peripheral side (lower side in FIG. 8) of the chain 3 contacts the support rail 14, so that the flight 4 is slidably supported on the support rail 14.

  Therefore, in the sludge scraping machine having the above-described configuration, even when the treated water W is not introduced into the sludge settling basin P, the sludge scraping body 5 located in the chain tension region X hangs down by its own weight, so that the flight 4 Can be prevented from overlapping and interfering with the sludge scraper 5 located on the lower travel path of the sludge sedimentation basin P or being grounded to the bottom surface Q of the sludge sedimentation basin P. For this reason, since it becomes possible to operate a sludge scraping machine at the beginning of installation or during repairs, it is possible to adjust and check the tension of the chain 3 and the traveling of the sludge scraping body 5 during the initial installation or during repairs. Therefore, it is possible to stably perform the normal operation of the sludge scraper after introducing the treated water W into the sludge settling basin P. Moreover, in this embodiment, the shoes 9 provided at both ends of the flight 4 are slidable on the support rail 14, and the flight 4 does not directly contact the support rail 14. It is possible to prevent the flight 4 from being worn.

  As described above, the length of the chain 3 of the sludge scraper 5 is longer than the length when the chain is wound around the pair of sprockets 2 without slack. The flights 4 are placed on the lower travel path (lower rail 11) on the lower travel path 14 at a distance smaller than the distance between the flights 4 in the travel direction F, and the chain 3 is adjacent to the support rails 14 adjacent to each other. The chain 3 hangs down between the upper flights 4 as described above, and the chain 3 connected to the flight 4 on the support rail 14 in the traveling direction F side is wound around the sprocket 2 on the side opposite to the mud pit T and circulates. Along with this, the sludge scraping body 5 sequentially sends the flight 4 to the lower travel path by tensioning the chain 3.

  Moreover, in this embodiment, the upper rail 12 which suppresses the floating of the sludge scraping body 5 in the treated water W is partly disposed on the sludge pit T side on the traveling path of the sludge scraping body 5 above the lower rail 11. The region where the upper rail 12 is not provided is the chain tension region X. In this embodiment, the support rail 14 is provided below the upper rail 12 in the chain tension region X. Therefore, when the treated water W is introduced into the sludge settling basin P, the sludge is scraped. The body 5 can be lifted in the chain tension region X without interfering with the support rail 14, and the more stable sludge scraper can be operated normally.

  Further, in the present embodiment, the upper rail 12 can be inserted into the recessed grooves 4a formed at both ends of the flight 4 as the support rail, and the treated water W is introduced into the sludge settling basin P. A state in which the groove wall surface of the groove 4a located on the inner peripheral side of the chain 3 is in sliding contact with the upper rail 12 from below to suppress the sludge scraping body 5 from rising and the treated water W is not introduced. Then, since the groove wall surface of the groove 4a located on the outer peripheral side of the chain 3 is in sliding contact with the upper rail 12 from the upper side, it is possible to prevent the flight 4 from being detached from the upper rail 12 and hanging down in any state.

  However, as described above, the upper rail 12 is not inserted into the concave groove 4a, and the shoe 9 of the flying flight 4 is brought into sliding contact with the upper rail 12 from below to suppress the sludge scraping body 5 from rising. In this case, in order to prevent the sludge scraper 5 from hanging down at the position of the upper rail 12 in the state where the treated water W is not introduced, the support rail 14 is extended to above the sprocket 2 on the mud pit T side. The flight 4 may be slidably supported. That is, the support rail 14 is only required to be provided at least in the chain tension region X, and may be provided in the entire traveling path on the upper side of the sludge scraper 5 in the above case.

  Further, in the present embodiment, the lower rail 11, the upper rail 12, and the support rail 14 are also provided on the long wall surface R and the inclined surface U that are the inner walls of the sludge sedimentation basin P and project into the sludge sedimentation basin P. 13 is attached. For this reason, not only when the sludge sedimentation basin P is newly installed, but also when the sludge scraping machine having the above configuration is installed in the existing sludge sedimentation basin P, the construction is easy and can be performed in a short period of time. As in the case where the support member is installed on the bottom surface Q of the pond P and the lower rail 11 and the upper rail 12 are attached, scratching of sludge is not hindered.

  Next, FIGS. 9 to 15 show first to seventh modified examples of the shoe 9 and modified examples of the flight 4 in the embodiment shown in FIG. 1, and are common to the embodiment shown in FIG. The same reference numerals are assigned to the parts to be described to simplify the description. Among these, in the modification shown in FIGS. 9 to 11, the flight 4 itself has a substantially Z-shaped cross section similar to the embodiment shown in FIG. 1, and the placement and attachment of the shoe 9 are the implementation shown in FIG. 1. It is different from the form.

  Among the modified examples shown in FIGS. 9 to 11, the shoe 9 of the first modified example shown in FIG. 9 includes a pair of flat shoes 9 attached to both sides of the center part of the flight by bolting or the like. The shoe 9 attached to the inner peripheral side of the chain 3 (the lower side in FIGS. 9 (a) and 9 (b)) of the portion extending from the central portion to the traveling direction F side, and the side opposite to the traveling direction F from the central portion The shoe 9 attached to the outer peripheral side (the upper side in FIGS. 9A and 9B) of the chain 3 in a portion extending in the direction is formed separately. Among these, the shoes 9 on the inner and outer peripheral sides of the chain 3 are attached to the flight 4 by adhesion or the like, for example.

  Further, in the embodiment shown in FIG. 1, a pair of shoes 9 having an L-shaped cross section are arranged at the center of the flight 4 so as to overlap and overlap each other between the flights 4, and collectively with two bolts. On the other hand, in the shoe 9 of the second modification shown in FIG. 10, the traveling direction F is located on the outer peripheral side of the chain 3 from the portion facing the traveling direction F side in the center of the flight 4. A shoe 9 having an L-shaped cross section extending to the opposite side, and a shoe 9 having an L-shaped cross section extending from the portion facing the opposite side to the traveling direction F at the center to the inner circumferential side of the chain 3 and extending to the traveling direction F side. Are not overlapped at the center of the flight 4 but are spaced by a narrower width than the groove width of the concave groove 4a of the flight 4 and are bolted separately.

  Further, in the shoe 9 of the third modified example shown in FIG. 11, a pair of flat shoes 9 are attached only to the center portion of the flight 4 and are opposite to the traveling direction F on the inner and outer peripheral sides of the chain 3. The shoes 9 are not attached to both ends of the flight 4 extending to the side. In such a third modified example, both ends of the flight 4 are in direct contact with the support rail 14 during the trial operation, but the period of the trial operation is extremely short compared with the normal operation, so that the wear of the flight 4 has a lifetime. Has very little effect.

  On the other hand, in the flight 4 of the modified example shown in FIGS. 12 to 15, in the cross section perpendicular to the longitudinal direction of the flight 4, the central portion is perpendicular to the traveling direction F as in the above embodiment, Both ends of the inner periphery side (the lower side in FIGS. 12 to 15) and the outer periphery side (the upper side in FIGS. 12 to 15) of the chain 3 both extend perpendicularly to the central portion and opposite to the traveling direction F. The flight 4 is formed in a cross-sectional “U” shape, C shape or F shape.

  Furthermore, in the shoe 9 of the fourth modified example shown in FIG. 12, the traveling of both ends from the position slightly projecting inward from the groove wall surface of the groove 4 a on the surface facing the traveling direction F at the center of the flight 4. A shoe 9 having an L-shaped cross section is disposed at a portion extending in the direction opposite to the direction F, and a surface facing the side opposite to the traveling direction F in the center of the flight 4 is slightly from the groove wall surface of the groove 4a. A flat plate-like shoe 9 is arranged between the position projecting inward to both ends, and bolted so that the shoe 9 having a L-shaped cross section and the flat shoe 9 sandwich the central portion of the flight 4. Has been attached.

  Further, in the shoe 9 of the fifth modification shown in FIG. 13, as in the first modification shown in FIG. 9, a pair of flat shoes 9 attached to both surfaces of the center of the flight by bolting or the like. And the shoe 9 attached to the inner peripheral side of the chain 3 (the lower side in FIGS. 13A and 13B) of both ends of the flight 4 extending from the center to the traveling direction F side, The shoe 9 attached to the outer peripheral side (the upper side in FIGS. 13A and 13B) is formed separately, and the shoes 9 on the inner and outer peripheral sides of the chain 3 are attached to the flight 4 by adhesion or the like, for example. .

  Further, in the shoe 9 of the sixth modified example shown in FIG. 14, the traveling direction F of both ends from the position slightly protruding inward from the groove wall surface of the concave groove 4 a on the surface facing the traveling direction F of the center of the flight 4. A shoe 9 having an L-shaped cross section is disposed only in a portion extending on the opposite side of the flight 4 and is attached to the center of the flight 4 by bolting.

  Furthermore, in the shoe 9 of the seventh modified example shown in FIG. 15, only the surface facing the traveling direction F at the center of the flight 4 and the surface facing the opposite side of the traveling direction F are separated from the groove wall surface of the groove 4 a. A flat shoe 9 is attached to the inner and outer peripheral sides of the chain 3 from a position slightly projecting inward so as to sandwich the center portion with bolts, and is attached to both ends of the flight 4 extending in the opposite direction to the traveling direction F. As in the third modification, the shoe 9 is not attached.

  Also in these first to seventh modifications, like the shoe 9 in the above-described embodiment, the concave groove 4a of the flight 4 is more than the groove wall surface facing the inner and outer peripheral sides of the chain 3 in the portion formed in the flight 4. Since the groove wall surface facing the inner and outer peripheral sides of the chain 3 at the portion formed on the shoe 9 is disposed so as to protrude, the shoe 9 is in sliding contact with the lower rail 11 and the upper rail 12 even in the concave groove 4a. It becomes the part formed in. For this reason, it is possible to prevent the flight 4 from being worn by sliding contact with the lower rail 11 and the upper rail 12 as in the above embodiment, and to extend the life of the flight 4 and the sludge scraper. It becomes.

  In the first embodiment, the pair of chains 3 of the sludge scraping body 5 are wound around the pair of long wall surfaces R of the sludge sedimentation basin P and the pair of sprockets 2 on the inclined surface U side, respectively. The entire travel route of the scraper 5 is configured to be disposed in the treated water W. For example, as in the second embodiment of the present invention shown in FIGS. 3 may be wound around three or more sprockets 2 to form a travel route. In the second embodiment, the same reference numerals are assigned to portions common to the first embodiment, and description thereof is omitted.

  That is, in the second embodiment, the lower part of the pair of sprockets 2 in the traveling path of the sludge scraping body 5 is the same as that of the first embodiment, whereas the waste of the pair of sprockets 2 is exhausted. A third sprocket 2A is disposed slightly above the position of the water surface of the treated water W above the sprocket 2 on the mud pit T side (the one short side S side), and the third sprocket 2A. The fourth sprocket 2B is slightly below the position of the water surface of the treated water W at a distance from the third sprocket 2A on the opposite side (the other short wall surface S side) of the waste water pit T. Are arranged so as to be located in each. The drive sprocket 6 is attached to a single sprocket support shaft 1 that connects and supports two third sprockets 2A and is connected to the rotation shaft of the drive device 7.

  Further, in the present embodiment, the upper rail 12 is horizontally disposed at a position where the end of the mud pit T side is above the third sprocket 2A and is substantially equal to the water surface of the treated water W, It extends to above the fourth sprocket 2B on the side opposite to the mud pit T. Further, a gap between the end of the upper rail 12 opposite to the mud pit T and the end of the support rail 14 on the mud pit T side is spaced in the longitudinal direction and the horizontal direction of the sludge settling basin P. In addition, the flight guide 15 is not provided at the end of the upper rail 12 opposite to the mud pit T.

  On the other hand, in the sludge scraping body 5 of the present embodiment, the float 10 is not attached to the flight 4 and the specific gravity is heavier than the specific gravity of the treated water W. As shown in FIG. 16, the sludge scraping body 5 sent out from the opposite end in the traveling direction F draws a curve in which the chain 3 protrudes downward without rising in the treated water W. Ground to the support rail 14. That is, in this embodiment, the chain tension region X is not provided. Further, the shoe 9 is not provided on the flight 4 on the outer peripheral side of the chain 3.

  In the sludge scraping machine of the second embodiment configured as described above, the specific gravity of the sludge scraping body 5 is heavier than the specific gravity of the treated water W, so that the treated water W is introduced into the sludge settling basin P. However, even when the lower rail 11 and the upper rail 12 are not introduced, the concave grooves 4a at both ends of the flight 4 are always provided on the upper groove wall surface of the sludge settling basin P as shown in FIGS. Is in sliding contact with the lower rail 11 and the upper rail 12. However, also in the second embodiment, by inserting the lower rail 11 and the upper rail 12 into the concave groove 4a in this way, the flight 4 is restrained in the vertical direction and the horizontal direction (longitudinal direction of the flight 4). Therefore, like the first embodiment, the lower rail 11 and the upper rail 12 do not fall off due to sloshing or the like during an earthquake.

  In the second embodiment, the chain 3 is also wound around the third and fourth sprockets 2A and 2B located slightly below the position of the water surface of the treated water W. The flight 4 can be run by protruding the outer peripheral side portion (upper part) of the chain 3 of the flight 4 from the water surface of the treated water W between the fourth sprockets 2A and 2B. For this reason, according to the present embodiment, the sludge accumulated on the bottom surface Q of the sludge settling basin P can be scraped up and discharged to the waste mud pit T by the flight 4, as well as these third and fourth sprockets. It is also possible to scrape the scum floating near the water surface by the upper part of the flight 4 protruding from the water surface of the treated water W between 2A and 2B. The scum thus scraped is adjacent to, for example, the fourth sprocket 2B. By providing the scum discharging means on the traveling direction F side, further clarification of the treated water W introduced into the sludge settling basin P can be promoted.

  Also in the present embodiment, since the support rail 14 that slidably supports the flight 4 is provided on the opposite side of the upper rail 12 from the sludge pit T, the sludge settling basin is provided as in the first embodiment. Even when the treated water W is not introduced into P, the sludge scraper can be operated to perform a trial run. In the present embodiment, the sludge scraper 5 is not allowed to float in the treated water W, and the flight guide 15 is provided at the end of the upper rail 12 opposite to the mud pit T. Therefore, in the first embodiment, the shoe 9 is provided on the outer periphery side (upper side) of the chain 3 of the flight 4 in the traveling path on the upper side of the sludge scraper 5 that is in sliding contact with the flight guide 15 as described above. Absent.

  Next, FIGS. 24 to 26 show first to third modified examples of the sludge scraper according to the first and second embodiments, respectively, and are common to these first and second embodiments. The same code | symbol is distribute | arranged to the part to perform. In the first to third modifications, at least the end of the support rail (the lower rail 11 and the upper rail 12) at the end of the sludge scraper 5 opposite to the traveling direction F is the end of the support rail. A guide rail 21 that is arranged in a circular arc around the rotation axis O of the sprocket 2 around which the chain 3 (attachment 3a) of the sludge scraping body 5 is wound is provided. Is characterized by being inserted into the concave groove 4 a of the flight 4.

  Here, in the first modification shown in FIG. 24, the ends of the pair of support rails (the lower rail 11 in FIG. 24A and the upper rail 12 in FIG. 24B) opposite to the traveling direction F. The guide rail 21 having a substantially ¼ arc shape centering on the rotation axis O of the sprocket 2 extends to the side opposite to the traveling direction F, and the chain 3 (attachment 3a) is wound around the sprocket 2 These guide rails 21 are inserted into the concave grooves 4a of the flight 4 of the sludge scraping body 5 that travels. However, in FIG. 24 to FIG. 26, the distance between the flights 4 is shown more densely than in FIG. 1 or FIG.

  Further, in the second modification shown in FIG. 25, the ends of the pair of support rails (also the lower rail 11 in FIG. 24A and the upper rail 12 in FIG. 24B) opposite to the traveling direction F. Accordingly, a guide rail 21 having an approximately 1/8 arc shape centering on the rotation axis O of the sprocket 2 extends in the opposite direction to the traveling direction F and is inserted into the concave groove 4 a of the flight 4. Further, in the third modified example shown in FIG. 26, the ½ arc-shaped guide rail 21 from the end opposite to the traveling direction F of the pair of upper rails 12 extends in the traveling direction F around the rotation axis O. The guide rail 21 is connected to the end of the lower rail 11 on the traveling direction F side.

  Note that at least the end of the support rail opposite to the travel direction F is between the guide rail 21 and the support rail (the lower rail 11 and the upper rail 12) at least the end opposite to the travel direction F. A thin portion 22 is provided in which the thickness in the direction in which the pair of groove wall surfaces of the concave grooves 4a of the flight 4 face each other decreases as the distance from the guide rail 21 increases, so that the guide rail 21 is thinner than the support rail. Has been. In the third modification shown in FIG. 26, the thickness increases between the end of the lower rail 11 on the traveling direction F side and the guide rail 21 from the end of the lower rail 11 toward the traveling direction F. A thin-walled portion 23 is provided to reduce the thickness. In the first to third modifications, these thin portions 22 and 23 extend in a direction in which the end on the side opposite to the traveling direction F of the support rail extends straight.

  When the support rails (the lower rail 11 and the upper rail 12) are formed in the shape of a square pipe as described above, the upper and lower surfaces of the guide rail 21 and the thin portion 22 are supported by the thin portion 22. The guide rails 21 are formed so as to approach each other from the upper and lower surfaces of the rail toward the opposite side of the traveling direction F, and the guide rail 21 is formed in an arc plate shape extending from the end of the thin portion 22 opposite to the traveling direction F. May be. Further, when the support rail is a pipe having a circular cross section as in the first and second embodiments, the thin portion 22 is connected to the end of the support rail so as to be opposite to the traveling direction F. The guide rail 21 is formed in a truncated cone shape that gradually decreases in diameter as it goes, and the guide rail 21 has a diameter larger than that of the support rail that is curved in an arc shape around the rotation axis O from the end opposite to the traveling direction F of the thin portion 22. A small pipe with a circular cross section may be used.

  In the sludge scraper of the first to third modifications, the chain 3 (attachment 3a) is wound around the sprocket 2 and is positioned in the concave groove 4a of the flight 4 positioned in the radial direction with respect to the rotation axis O. The guide rail 21 can be reliably inserted and guided to the support rail, and the concave groove 4a can also be reliably inserted into this support rail. For this reason, sloshing in the event of an earthquake or shaking of the treated water W in the sludge settling basin P occurs, or the chain 3 is initially installed when the sludge scraper is installed in the sludge settling basin P or when the sludge scraper is repaired. Even when the tension is insufficient, the flight 4 can be reliably prevented from falling off. In particular, in the third modification shown in FIG. 26, the guide rail 21 has a 1/2 arc shape and is connected to the ends of the lower rail 11 and the upper rail 12, so that the concave groove 4 a is detached from the guide rail 21. The flight 4 can be guided more reliably.

  Moreover, in these 1st thru | or 3rd modification, between the guide rail 21 and at least the edge part on the opposite side to the said traveling direction F of a support rail, it exists on the opposite side to the traveling direction F of this support rail at least. A thin-walled portion 22 is provided in which the thickness in the direction in which the pair of groove wall surfaces of the concave groove 4a face each other as the distance from the end portion decreases, and the thickness of the guide rail 21 is made thinner than that of the support rail. For this reason, even if there is a gap between the guide rail 21 and the support rail on the side opposite to the traveling direction F as in the first and second modifications, the guide rail 21 is inserted into the concave groove 4a of the flight 4. In addition to being able to insert reliably, the flight 4 can be smoothly guided by the inclination of the thin wall portion 22 and the concave groove 4a can be inserted into the support rail.

  The thin portions 22 and 23 may be formed in an arc shape with the rotation axis O as the center like the guide rail 21, and may be a part of the guide rail 21. Moreover, such a guide rail 21 and the thin part 22 are the rotation axis of the 3rd sprocket 2A in the edge part on the opposite side to the running direction F of the upper rail 12 of 2nd Embodiment shown in FIG. 16, for example. It may be provided in a range as shown in FIG. 24B or FIG.

DESCRIPTION OF SYMBOLS 1 Sprocket support shaft 2, 2A, 2B Sprocket 3 Chain 3a Attachment 4 Flight 4a Groove 5 Sludge scraping body 6 Drive sprocket 7 Drive device 8 Drive chain 9 Shoe 10 Float 11 Lower rail (support rail)
12 Upper rail (support rail)
13 Support member 14 Support rail 15 Flight guide 21 Guide rail 22 Thin wall portion P Sludge sedimentation basin Q Bottom surface of sludge sedimentation basin R Long wall surface of sludge sedimentation basin S Short wall surface of sludge sedimentation basin T Waste mud pit U Sludge sedimentation basin Inclined surface of P W Treated water F Traveling direction of sludge scraper 5 O Rotation axis of sprocket 2

Claims (9)

A chain that is arranged so as to be wound endlessly in the sludge sedimentation basin and travels around is attached to a flight that scrapes the sludge accumulated on the bottom surface of the sludge sedimentation basin to constitute a sludge scraping body,
At both ends of the flight in the longitudinal direction of the flight crossing the traveling direction of the sludge scraper, concave grooves are formed that penetrate the flight in the traveling direction and open on both end surfaces of the flight, respectively. And
A pair of support rails installed in the sludge settling basin and extending in the traveling direction are inserted into these concave grooves, respectively.
The flight travels while at least one of a pair of opposed groove wall surfaces of the concave groove slidingly contacts the support rail.   The said support rail is at least one of the lower rail installed in the lower side in the said sludge sedimentation basin, and the upper rail installed in the upper side in the said sludge sedimentation basin, The Claim 1 characterized by the above-mentioned. Sludge scraping machine.   The sludge scraper according to claim 1 or 2, wherein shoes are attached to both ends of the flight, and the shoes are in sliding contact with the support rail in the flight. The sludge scraping body can be levitated in the treated water in the sludge sedimentation pond,
The support rail is an upper rail installed on the upper side in the sludge sedimentation basin, and the sludge scraping body floats in the treated water in the traveling path of the sludge scraping body on the upper side in the sludge sedimentation pond. A chain tension area is provided to allow
Above the end of the upper rail on the chain tension region side, a flight guide extending upward as it goes in the running direction of the sludge scraper on the upper side in the sludge settling basin is attached. The sludge scraper according to any one of claims 1 to 3. A sprocket around which the chain is wound is rotatably disposed at an end of the support rail,
A guide rail extending in an arc shape centering on the rotation axis of the sprocket is provided at least on the end of the support rail opposite to the traveling direction,
The sludge scraper according to any one of claims 1 to 4, wherein the guide rail is inserted into the concave groove of the flight.   Between the guide rail and at least the end of the support rail opposite to the travel direction, the pair of the concave grooves as the distance from the end of the support rail opposite to the travel direction increases. 6. The sludge according to claim 5, further comprising a thin-walled portion whose thickness is reduced in a direction in which the groove wall surfaces face each other, wherein the guide rail is thinner than the support rail. Scraper.   The support rail includes an upper rail installed on the upper side in the sludge settling basin and a lower rail installed on the lower side, and ends of the upper rail and the lower rail are connected by the guide rail. The sludge scraping machine according to claim 5 or 6, characterized in that. A flight used in the sludge scraper according to any one of claims 1 to 7,
A flight characterized in that concave grooves are formed in both end portions in the longitudinal direction so as to penetrate the traveling direction and open on both end surfaces. A shoe attached to a flight according to claim 8,
A shoe that is slidably contactable with the support rail.

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