JP6058509B2 - Sludge scraping machine - Google Patents

Description

  The present invention relates to a sludge scraping machine that scrapes sludge accumulated on a pond bottom.

  Conventionally, a chain flight type sludge scraping machine is known as a sludge scraping machine that scrapes the sludge accumulated on the bottom of a sedimentation basin (tank) in a sewage treatment plant (see, for example, Patent Document 1). The chain flight sludge scraping machine has multiple flights (scraping blades) that scrape sludge against a pair of endless chains that move around the tank facing the width direction of the rectangular sedimentation basin in plan view. Is provided. A 4-axis type chain flight type sludge scraper described in Patent Document 1 includes a pair of driven shafts spaced apart in the longitudinal direction of the settling basin near the pond bottom, a drive shaft and a driven shaft spaced apart in the longitudinal direction near the water surface Shafts, endless chains are wound around these four shafts, a pair of endless chains move around and the flight moves, scraping the sludge accumulated on the pond bottom to one end of the settling basin, The scum (floating matter) floating on the water surface is scraped to the other end of the sedimentation basin.

  Of the pair of driven shafts near the pond bottom, the upstream driven shaft in the sludge scraping direction is a take-up shaft for adjusting the looseness of the endless chain, and the downstream driven shaft in the sludge scraping direction is endless. It is a lower guide shaft for guiding the circular movement of the chain. The drive shaft disposed near the water surface is disposed upstream of the scraping direction of the scum, and the driven shaft disposed near the water surface is disposed downstream of the drive shaft in the scraping direction of the scum. It is an upper guide shaft for guiding the circular movement. The take-up shaft is disposed upstream of the upper guide shaft in the sludge scraping direction.

  Of the endless chain wound around the four shafts, the portion that reaches the take-up shaft from the upper guide shaft is the portion where the endless chain sags. It functions as a canary section that generates tension in the endless chain portion between the shaft. A flight that drove near the bottom of the pond and sewed sludge ascends as the endless chain revolves, rakes the scum that moves along the water surface between the drive shaft and the upper guide shaft and rises to the water surface. ing.

Japanese Patent No. 4536595

  In the conventional 4-axis type chain flight type sludge scraper, when the endless chain is extended and the endless chain is loosened, the endless chain that moves near the water surface between the drive shaft and the upper guide shaft is increased. As a result, there is a risk that the endless chain may cause problems such as tooth skipping or wheel disengagement in the sprocket wheel of the drive shaft.

  In the 4-axis type chain flight type sludge scraper, the tension of the endless chain is periodically adjusted by moving the take-up shaft to the opposite side of the lower guide shaft to prevent the endless chain from loosening. Was. In this way, when adjusting the tension of the endless chain using the take-up shaft, it was necessary to drain all the water from the settling basin.

  In addition, when sloshing occurs due to the occurrence of an earthquake, there is a possibility that the endless chain may be removed due to the force acting on the scraping blades traveling along the water surface by undulations.

  An object of the present invention is to provide a sludge scraper that can eliminate the need for take-up of an endless chain and can reduce the risk of the endless chain dropping off when an earthquake occurs.

  The sludge scraping machine of the present invention is a scraping device that scrapes the sludge accumulated in the sedimentation basin, a plurality of scraping blades that scrape the sludge, an endless chain that supports the plurality of scraping blades, and the sedimentation basin A pair of driven shafts that are spaced apart from each other in the sludge scraping direction at the bottom of the pond and on which the endless chain is wound, and disposed above the pair of driven shafts, the endless chain is wound and driven to the endless chain A plurality of scraping blades that are provided only in the portion corresponding to the pond bottom, reciprocate between a pair of driven shafts, squeeze sludge when moving forward, and sludge when moving backward It is characterized by not scratching.

  In this sludge scraping machine, the scraping blades are provided only at the portion corresponding to the pond bottom, and the scraping blades reciprocate at the pond bottom, so that the sludge can be scraped to one end side of the sedimentation basin. The scraping blades are arranged only at the part corresponding to the bottom of the pond, and the scraping blades do not move near the water surface, so even if sloshing occurs during an earthquake, the endless chain is not affected by waves on the water surface. The risk of falling off is reduced. In addition, since the pair of driven shafts are disposed on the bottom of the pond and the drive shaft is disposed above the pair of driven shafts, the endless chain on the loose side of the drive shaft (the side to which the drive force is applied) is directed downward. It only hangs down, and even if the endless chain extends and loosens, it is not necessary to adjust the tension of the endless chain. This eliminates the need for take-up.

  The plurality of scraping blades are supported by the endless chain so as to be rotatable about a rotation axis extending in a direction crossing the moving direction of the endless chain, and the lower ends of the scraping blades are close to the pond bottom. It is preferable to advance in a posture and to retreat in a second posture in which the lower end of the scraping blade is separated from the pond bottom. According to the sludge scraping device having this configuration, the lower end of the scraping blade approaches the pond bottom in the first posture, and the sludge accumulated on the pond bottom by moving the scraping blade in the first posture forward. In the second position, the lower end of the scraping blade is separated from the bottom of the pond, and the scraping blade in the second position is moved backward to move the scraping blade upstream without scraping the sludge. Can be returned to the side. By repeating the reciprocating motion of the scraping blades in this way, the sludge can be moved forward in order using a plurality of scraping blades.

  Further, the first support extending from the outside of the moving path of the scraping blade to the moving path side, and the first blade that is supported by the first support and moves forward in the first posture, or the first protruding from the scraping blade. A first striker that abuts against the overhanging portion 1 and pushes down the scraping blade to change from the first posture to the second posture, and extends from the outside of the moving route of the scraping blade to the moving route side. The second support and the second support supported by the second support and retreating in the second posture or the second projecting portion projecting from the scraping blade are brought into contact with each other to raise the second scraping blade. A configuration may be provided that includes a second striker that changes from the above posture to the first posture. According to the sludge scraping device of this configuration, the first striker abuts against the scraping blade that advances in the first posture or the first overhanging portion that protrudes from the scraping blade. The second striker can be pushed down and changed from the first posture to the second posture, and the second striker retreats in the second posture or comes into contact with the second overhanging portion protruding from the scraping blade. Thus, the scraping blade can be raised to change from the second posture to the first posture.

  In addition, a chain guide disposed on the drive shaft at a position corresponding to the sprocket around which the endless chain is wound is arranged outside the endless chain track to prevent the endless chain from moving outward in the radial direction of the sprocket. The structure provided may be sufficient. Accordingly, by providing the chain guide on the outer side of the track of the endless chain wound around the sprocket, it is possible to prevent the endless chain from being removed from the sprocket. Even when the sludge scraper is subjected to vibration when an earthquake occurs, the risk of the endless chain falling off can be reduced.

  An object of the present invention is to provide a sludge scraper that can eliminate the need for take-up of an endless chain and can reduce the risk of the endless chain dropping off when an earthquake occurs.

It is a schematic perspective view which shows the sludge scraping machine of one Embodiment of this invention. It is a schematic side view of the sludge scraper shown in FIG. It is an enlarged front view which shows the part of the side wall vicinity of the flight in FIG. It is an enlarged side view which shows the support part of a flight. It is an enlarged front view which shows the part of the side wall vicinity of the flight in FIG. It is a side view which shows a mode that the attitude | position changes to a horizontal state, while the flight of a vertical state advances. It is a side view which shows a mode that the attitude | position changes to a vertical state, while the flight of a horizontal state retreats. It is a schematic plan view which shows arrangement | positioning of the roller part utilized for the attitude | position change of a flight.

  Hereinafter, a preferred embodiment of a sludge scraper according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the sludge scraper 100 is a triaxial chain flight type sludge scraper, and is installed, for example, in a settling basin (tank) 1 of a sewage treatment plant.

  The sludge scraper 100 is provided with a plurality of flights (scraping blades) 21 and 22 only in a portion corresponding to the pond bottom 2 of the sedimentation basin 1 and scrapes sludge by reciprocating the plurality of flights 21 and 22. Bring In the sludge scraper 100, the flights 21 and 22 are set in a vertical state (first posture) when the flights 21 and 22 are advanced, the sludge is scraped to one end side, and the flights 21 and 22 are knocked down when the flights 21 and 22 are moved backward. In a horizontal state (second posture), sludge is not scraped.

  The sedimentation basin 1 is configured to be horizontally long, and sewage is supplied from the left side of FIG. A sludge collection pit 3 is provided at the end of the sewage supply side (one end side) of the pond bottom 2 of the settling basin 1, and a discharge pipe for discharging sludge to the outside is provided for the sludge collection pit 3. It is done. In the sedimentation basin 1, the direction in which the sludge collection pit 3 is formed is referred to as “front”.

  The sludge scraper 100 includes an endless chain (chain) 5 that moves in the longitudinal direction in the sedimentation basin 1, and the endless chain 5 is provided with a pair facing the width direction of the sedimentation basin 1. Yes. The flights (scraping blades) 21 and 22 extend in the width direction of the sedimentation basin 1 and extend to the vicinity of the side wall 4 of the sedimentation basin 1. It is attached to the endless chain 5.

  In the sludge scraper 100, a first driven shaft 6 is provided on the bottom 2 of the sedimentation basin 1 on the opposite side of the sludge collection pit 3 (the right side in the figure), and the sludge collection pit on the bottom 2 of the pond. A second driven shaft 7 is provided at a position near three. The first driven shaft 6 is rotatably supported by a driven shaft support portion fixed to the opposing side wall 4 of the sedimentation basin 1. A sprocket wheel 5 a around which the endless chain 5 is wound is attached and fixed to the end of the first driven shaft 6. The second driven shaft 7 is rotatably supported by a driven shaft support portion fixed to the opposing side wall 4 of the sedimentation basin 1. A sprocket wheel 7 a around which the endless chain 5 is wound is attached and fixed to the end of the second driven shaft 7.

  In the sludge scraper 100, a drive shaft 8 is provided above the second driven shaft 7 below the water surface 1 a of the sedimentation basin 1. The drive shaft 8 is disposed on the opposite side of the sludge collection pit 3 with respect to the second driven shaft 7 in the longitudinal direction of the sedimentation basin 1. Both ends of the drive shaft 8 are rotatably supported by drive shaft support portions fixed to the opposing side walls 4 of the sedimentation basin 1. A pair of sprocket wheels 8 a around which the endless chain 5 is wound are respectively attached and fixed to both ends of the drive shaft 8.

  As shown in FIG. 1, the endless chain 5 is hung around the wheels 6 a, 7 a, 8 a, and a part of the endless chain 5 is a sprocket wheel 6 a of the first driven shaft 6 and a sprocket of the second driven shaft 7. It is stretched along the pond bottom 2 of the settling basin 1 with the wheel 7a. Further, when the sludge scraper 100 is scraped, a canary portion 11 of the endless chain 5 is formed between the sprocket wheel 8 a of the drive shaft 8 and the sprocket wheel 6 a of the first driven shaft 6. In the canary unit 11, the endless chain 5 is inclined from the drive shaft 8 toward the first driven shaft 6 and hangs down while being bent.

  In the sludge scraper 100, a motor sprocket wheel 8b is attached and fixed to one end of the drive shaft 8 on the outer side in the axial direction (outside in the width direction of the sedimentation basin 1) than the sprocket wheel 8a. A motor 9 for rotationally driving the drive shaft 8 is installed on a stage 4 a provided at the upper end of the side wall 4 above 8. A drive chain 10 is hung between a motor sprocket wheel 9 a fixed to the output shaft of the motor 9 and a sprocket wheel 8 a of the drive shaft 8. In FIG. 2, the motor 9 and the drive chain 10 are not shown.

  Further, a guide rail 12 (see FIGS. 3 and 5) is provided in the vicinity of the pond bottom 2 of the settling basin 1 so as to extend in the longitudinal direction of the settling basin 1 and guide the movement of the flights 21 and 22. The guide rail 12 is supported by a guide rail support portion 13 that is fixed to the side wall 4 of the settling basin 1 and projects from the side wall 4 to the inside in the width direction of the settling basin 1. A plurality of guide rail support portions 13 are installed at predetermined intervals in the longitudinal direction of the settling basin 1, and the guide rails 12 are bridged over the guide rail support portions 13. The guide rail 12 is disposed outside the endless chain 5 in the width direction of the sedimentation basin 1, abuts on the flight guide 14 projecting from the flight support portion 20 that supports the flights 21 and 22 with respect to the endless chain 5, and the flight 21 , 22 is restrained. The flight guide 14 moves while sliding on the guide rail 12. A shoe 18 is provided on the contact surface of the flight guide 14 with the guide rail 12. When the shoe 18 is worn, it is replaced with a new shoe 18.

  Next, flights 21 and 22 will be described in detail. FIG. 3 is an enlarged front view showing a portion in the vicinity of the side wall of the flight in FIG. FIG. 4 is an enlarged side view showing the flight support. FIG. 5 is an enlarged plan view showing a portion near the side wall of the flight. FIG. 6 is a side view showing how the posture changes from the vertical state to the horizontal state while the flight moves forward. FIG. 7 is a side view showing how the posture changes from the horizontal state to the vertical state while the flight moves backward. FIG. 8 is a schematic plan view showing the arrangement of roller portions used for changing the posture of the flight.

  In the sludge scraper 100, the flights 21 and the flights 22 are alternately provided in the front-rear direction. The structures of the flights 21 and 22 are basically the same, and the arrangement of the overhang portions 51 and 52 is different in order to change the posture of the flights 21 and 22. In addition, in FIG.1 and FIG.2, illustration of the overhang | projection parts 51 and 52 is abbreviate | omitted.

  The flights 21 and 22 include a flight body 23 that extends in the width direction of the settling basin 1 between a pair of endless chains 5. As shown in FIGS. 6 and 7, the flight main body 23 is configured by stacking channel members 24 and 25 having a U-shaped cross section in two stages in the vertical direction. The lower flange 24a (see FIG. 4) of the upper channel member 24 and the upper flange 25a of the lower channel member 25 are joined together to form the flight body 23 as an integral unit. As the channel members 24 and 25, those made of resin can be used.

  As shown in FIGS. 3 to 5, at both ends in the longitudinal direction of the flight body 23, there are provided rotating shafts 26 projecting outward in the width direction of the sedimentation basin 1, and flight expansion is performed outside the rotating shaft 26. A portion 27 is provided. The rotation shaft 26 is rotatably supported by the flight support portion 20 with respect to the endless chain 5 and is disposed at the center of the flight body 23 in the vertical direction shown in FIGS. 3 and 4.

  The flight extension 27 is connected to the flight main body 23 via the rotation shaft 26 and can be rotated and moved in the same posture as the flight main body 23. The flight extension 27 is formed by a channel member having a U-shaped cross section, and is disposed at substantially the same height as the channel member 25 on the lower stage of the flight body 23 in the vertical direction. The rotary shaft 26 is connected to a position corresponding to the upper end of the flight extension 27. The flight extension 27 is disposed outside the endless chain 5 in the width direction of the sedimentation basin 1, and is disposed from the flight support 20 to the vicinity of the side wall 4 of the sedimentation basin 1. The flight extension portion 27 is disposed in a region below the guide rail 12 and the guide rail support portion 13.

  The flight support unit 20 includes a bearing 28 that rotatably supports the rotating shaft 26, and the bearing 28 is coupled to a bearing coupling unit 29 that projects downward from the endless chain 5. On the front side of the bearing connecting portion 29, a bearing support portion 30 that supports the overhanging bearing 28 from below is fixed, and the bearing 28 is disposed and fixed on the bearing support portion 30.

  A float 31 is attached to the flight body 23. The float 31 only needs to be lighter than the specific gravity of water, and generates buoyancy in the flight body 23 to relieve the contact force between the guide rail 12 and the flight guide 14. The float 31 is attached to the back side of the upper and lower channel members 24 and 25, respectively. The load acting on the shoe 18 by the float 31 is reduced, and the wear amount of the shoe 18 is reduced.

  Further, the flight support portion 20 is provided with a stopper 32 for restraining the postures of the flights 21 and 22. The stopper 32 includes a stopper support portion 33 that extends in the horizontal direction from the bearing connection portion 29 to the inner side in the width direction of the sedimentation basin 1, and the distal end portion of the stopper support portion 33 is disposed on the back side of the flight body 23. . The stopper support portion 33 is configured by a member having an L-shaped cross section, and includes a front plate 33a disposed on the front side and a top plate 33b projecting rearward from the upper end portion of the front plate 33a. A base end portion of the front plate 33a is fixed to the back side of the bearing connecting portion 29, and a first stopper portion 34 that abuts the back surface of the lower channel member 25 is provided on the front surface of the front plate 33a, and the top plate 33b. A second stopper portion 35 that abuts against the back surface of the upper channel member 24 is provided on the top surface of the tip.

  As shown in FIGS. 6 and 7, a back plate 36 that contacts the first stopper portion 34 and the second stopper portion 35 is provided on the back surface of the flight main body 23. As shown in FIGS. 6A and 7C, the first stopper portion 34 abuts on the back surface of the flight main body 23 in the vertical state, and the second stopper portion 35 is formed in the state shown in FIGS. As shown in FIG. 7 (a), it contacts the back surface of the flight main body 23 in the horizontal state.

  Next, the attitude variable mechanism that rotates the flights 21 and 22 around the rotation axis 26 to change to the first attitude in the vertical state or the second attitude in the horizontal state will be described. The vertical state of the flights 21 and 22 is a state in which the front plate 23a of the flight main body 23 is arranged vertically when the flight main body 23 is viewed from the side (FIG. 6A and FIG. 7). (C)), a state in which the front plate 23a of the flight main body 23 is horizontally disposed (FIG. 6 (c), FIG. 7 (a)).

  As shown in FIG. 6, the attitude variable mechanism includes a first striker 41 for changing the flights 21 and 22 from the first attitude to the second attitude, and flights 21 and 22 as shown in FIG. And a second striker 42 for changing the position from the second position to the first position.

  As shown in FIG. 3, the first striker 41 is supported by a first striker support 43 that protrudes inward in the width direction of the settling basin 1 from one side wall 4 of the settling basin 1. The first striker support 43 is disposed so as to approach the flight main body 23 from the outside of the movement path of the flight main body 23. The tip of the first striker support 43 is disposed above the movement path of the flight body 23. The first striker support 43 is disposed at the front end of the moving range of one flight 21, 22 in the longitudinal direction of the sedimentation basin 1.

  The first striker 41 is fixed to the tip of the first striker support 43 and is arranged to extend downward. As shown in FIG. 6, the first striker 41 includes a roller portion 41 b that can rotate around a rotation shaft 41 a that extends in the width direction of the sedimentation tank 1.

  Further, the flight body 23 is provided with a first overhanging portion 51 that contacts the roller portion 41 b of the first striker 41. The first projecting portion 51 is formed by bending a band-shaped plate member. As shown in FIG. 6A, the first projecting portion 51 is extended from the front plate 23a of the flight body 23 diagonally forward and bent upward from the upper end of the support piece 51a. A contact piece 51b and an extending piece 51c bent obliquely rearward from the upper end of the contact piece 51b. The contact piece 51b is disposed at a position corresponding to the upper end 23b of the flight main body 23 in the vertical direction, and contacts the roller portion 41b of the first striker 41 when the flight main body 23 moves forward in the first posture.

  Further, as shown in FIG. 6C, the contact piece 51b extends in the horizontal direction and faces the lower surface of the roller portion 41b when the flight main body 23 is in the second posture. Be placed. When the flight main body 23 in the second posture moves below the roller portion 41b, the flight main body 23 can be moved without rotating even if the contact piece 51b contacts the lower surface of the roller portion 41b. .

  As shown in FIG. 3, the second striker 42 is supported by a second striker support 44 that projects from one side wall 4 of the settling basin 1 to the inside in the width direction of the settling basin 1. The second striker support 44 is disposed so as to approach the flight main body 23 from the outside of the movement path of the flight main body 23. The tip of the second striker support 44 is disposed above the movement path of the flight main body 23. The second striker support 44 is disposed at the rear end of the moving range of one flight 21, 22 in the longitudinal direction of the sedimentation basin 1.

  The second striker 42 is fixed to the tip of the second striker support 44 and is arranged to extend downward. The second striker 42 is arranged at a position different from the first striker 41 in the width direction of the sedimentation basin 1. Specifically, the second striker 42 is disposed inside the first striker 41 in the width direction of the sedimentation basin 1. As shown in FIG. 7, the second striker 42 has a roller portion 42 b that can rotate around a rotation shaft 42 a that extends in the width direction of the settling basin 1.

  Further, the flight body 23 is provided with a second overhanging portion 52 that contacts the roller portion 42 b of the second striker 42. The second overhang portion 52 is formed by bending a belt-like plate-like member. As shown in FIG. 7C, the second overhanging portion 52 is supported from the front plate 23a of the flight main body 23 obliquely forward, and bent from the upper end of the support piece 52a so as to move forward in the horizontal direction. A contact piece 52b extending in a straight line, and an extension piece 52c bent obliquely downward from the front end of the contact piece 52b. The contact piece 52b is disposed at a position corresponding to the upper end 23b of the flight main body 23 in the vertical direction.

  Further, as shown in FIG. 7A, the contact piece 52b extends in the vertical direction when the flight body 23 is in the second posture, and corresponds to the roller portion 42b of the second striker 42. Placed at height. The contact piece 52b contacts the roller portion 42b of the second striker 42 when the flight main body 23 moves backward in the second posture.

  Further, as shown in FIG. 7C, the contact piece 52b extends in the horizontal direction and faces the lower surface of the roller portion 42b when the flight main body 23 assumes the first posture. Be placed. When the flight main body 23 in the first posture moves below the roller portion 42b, the flight main body 23 can be moved without rotating even if the contact piece 52b contacts the lower surface of the roller portion 42b. .

  Next, with reference to FIG. 6, the change from the 1st attitude | position of the flights 21 and 22 to a 2nd attitude | position is demonstrated.

  As shown in FIG. 6A, the flights 21 and 22 move forward in the first posture as the endless chain 5 rotates. When the flights 21 and 22 are in the first posture, the lower end 23c of the flight main body 23 is close to the pond bottom 2 of the settling basin 1, and is accumulated on the pond bottom 2 by moving forward in this state. Sludge can be scraped forward.

  When the flights 21 and 22 move forward in the first posture, they approach the first striker 41 arranged in front of the flights 21 and 22. When the flights 21 and 22 further advance, the first overhanging portion 51 hits the roller portion 41b of the first striker 41, and the first overhanging portion 51 is pushed backward as shown in FIG. The main body 23 also rotates around the rotation axis 26, the upper end 23b of the flight main body 23 moves rearward, the lower end 23c of the flight main body 23 moves forward, and as shown in FIG. It will be in a horizontal state and will be in the 2nd posture. When the flights 21 and 22 are retreated in this second posture, the flights 21 and 22 can be retreated without scraping the sludge because the lower end 23c of the flight body is separated from the pond bottom 2.

  Next, with reference to FIG. 7, the change from the 2nd attitude | position of the flights 21 and 22 to a 1st attitude | position is demonstrated.

  In the sludge scraper 100, the revolving movement of the endless chain 5 can be reversed by rotating the motor 9 in the reverse direction. When the circular movement of the endless chain 5 is reversed, the endless chain 5 moving along the pond bottom 2 moves in a direction opposite to the sludge collection pit 3 to retract the flights 21 and 22.

  The flights 21 and 22 retreat in the second posture, as shown in FIG. When the flights 21 and 22 are in the second posture, as described above, the flight 21 moves backward without scraping the sludge.

  When the flights 21 and 22 advance in the second posture, they approach the second striker 42 disposed behind the flights 21 and 22. When the flights 21 and 22 are further retracted, the second overhanging portion 52 hits the roller portion 42b of the second striker 42, and the second overhanging portion 52 is raised upward as shown in FIG. The main body 23 also rotates around the rotation axis 26, the upper end 23b of the flight main body 23 moves upward, the lower end 23c of the flight main body 23 moves downward, and as shown in FIG. It returns to the first posture in the vertical state. In this way, the sludge can be scraped sequentially to the sludge collection pit 3 by changing the postures of the flights 21 and 22 and reciprocating the flights 21 and 22.

  Next, the arrangement of the first striker 41 and the second striker 42 will be described with reference to FIG.

  In the sludge scraper 100, the moving ranges of the front and rear flights 21 and 22 partially overlap in the longitudinal direction of the sedimentation basin 1. Therefore, in the width direction of the sedimentation basin 1, the positions of the front and rear first strikers 41 are shifted, and the positions of the front and rear second strikers 42 are shifted.

  Specifically, the first striker 41 (A) for the flight 21 and the first striker 41 (B) for the flight 22 have different positions in the width direction of the sedimentation basin 1, and the striker 41 (B) It is arranged inside the striker 41 (A).

  The position of the second striker 42 (A) for the flight 21 and the second striker 42 (B) for the flight 22 in the width direction of the sedimentation basin 1 is different, and the striker 42 (B) ) Is placed inside.

  Similarly, the first overhang portion 51 provided in the flight 21 and the first overhang portion 51 provided in the flight 22 are arranged so as not to overlap with each other, It arrange | positions so that the 2nd overhang | projection part 52 provided in the flight 22 may not overlap.

  Further, as shown in FIG. 8, limit switches 45 and 46 for detecting the positions of the flights 21 and 22 are provided in the sedimentation basin 1. The limit switches 45 and 46 detect the return positions of the flights 21 and 22 that reciprocate in the sedimentation tank 1. It is sufficient that at least one set of limit switches 45 and 46 is provided in the settling basin 1. The limit switch 45 is disposed at a position closest to the sludge collection pit 3 in the movement range of one flight 21, and the limit switch 46 is disposed from the sludge collection pit 3 most in the movement range of one flight 21. It is located at a distance. The motor 9 receives the detection signals from the limit switches 45 and 46, changes the rotation direction to the reverse direction, and changes the circular movement of the endless chain 5 to the reverse direction.

  The positions of the flights 21 and 22 may be detected using the first striker 41 and / or the second striker 42. The first striker 41 and / or the second striker 42 may be provided with a detection unit that detects the positions of the flights 21 and 22.

  Next, the operation of the sludge scraper 100 configured as described above will be described.

  In the sludge scraper 100, the sludge accumulated on the pond bottom 2 is caused by rotating the motor 9 in the forward direction to move the endless chain 5 around in the direction a in the figure to advance the flights 21 and 22 in the first posture. Can be raked into the sludge collection pit 3. When the flights 21 and 22 advance to a predetermined position, the first overhanging portion 51 of the flights 21 and 22 hits the first striker 41, and the flights 21 and 22 rotate around the rotation shaft 26 to move to the first posture. To the second posture. The flights 21 and 22 are brought into contact with the second stopper portion 35 and the rotational movement about the rotation shaft 26 is restrained to maintain the second posture.

  Next, after the flight 21 is detected by the limit switch 45, the motor 9 is rotated in the reverse direction, and the endless chain 5 is revolved in the reverse direction in the direction b in the figure, so that the flights 21 and 22 in the second posture are moved backward. During the retreat, the flights 21 and 22 are in the second posture, and thus move without scraping the sludge. When the flights 21 and 22 retreat to a predetermined position, the second overhanging portion 52 of the flights 21 and 22 hits the second striker 42, and the flights 21 and 22 rotate around the rotary shaft 26 to move to the second posture. To the first posture. The flights 21 and 22 are brought into contact with the first stopper portion 34 and the rotational movement about the rotation shaft 26 is restricted, and the first posture is maintained.

  Then, after detecting the flight 21 by the limit switch 46, the motor 9 is rotated in the forward direction again, the endless chain 5 is moved around in the direction a in the figure, and the flights 21 and 22 in the first posture are advanced to scrape the sludge. Bring By repeating these, the flights 21 and 22 are reciprocated.

  In such a sludge scraper 100, the flights 21 and 22 are provided only in the portion corresponding to the pond bottom 2, and the sludge is collected in the sedimentation basin 1 by the reciprocating motion of the flights 21 and 22 at the pond bottom 2. The pit 3 can be scraped sequentially. Since the flights 21 and 22 are arranged only in the portion corresponding to the pond bottom 2 and the flights 21 and 22 do not move near the water surface, even if sloshing occurs during an earthquake, it is not affected by the waves on the water surface. The possibility of the endless chain 5 falling off is reduced. Further, since the pair of driven shafts 6 and 7 are disposed on the pond bottom 2 and the drive shaft 8 is disposed above the pair of driven shafts 6 and 7, the drive shaft 8 is loosened (provided with a driving force and sent out). The endless chain 5 of the endless chain 5 only hangs downward, and even if the endless chain 5 extends and loosens, it is not necessary to adjust the tension of the endless chain 5. Therefore, the take-up for that purpose can be eliminated, and the maintenance cost of the sludge scraper 100 can be suppressed.

  Further, in the conventional 2-axis type chain flight type sludge scraper, it is necessary to take up and adjust the tension when the endless chain is loosened, but in the 3-axis type chain flight type sludge scraper 100, As described above, the endless chain 5 on the loose side of the drive shaft 8 only hangs downward, and the need for take-up can be eliminated.

  The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

  In the above embodiment, the flight 21 and 22 are rotated to change the first posture to the second posture. However, the flight 21 and 22 may be swung to change the posture. The first posture is not limited to the vertical state, and may be inclined from the vertical state.

  Further, the flight 21 and 22 may be moved in the vertical direction to change from the first posture to the second posture.

  Moreover, in the said embodiment, although the attitude | position of a flight is changed by applying a striker to the overhang | projection part of a flight, you may change an attitude | position by applying a striker directly to a flight main body. Further, the flight attitude may be changed by rotating the flight axis by motor driving.

  Moreover, although it is set as the 3-axis type in the said embodiment, it is good also as a 4-axis type. In the case of the 4-axis type, the upper driven shaft is disposed below the drive shaft, for example, so that the portion where the endless chain 5 travels near the water surface is eliminated.

  Further, in the case of a 4-axis type chain flight type sludge scraping machine, an auto tensioner 17 (see FIG. 1) for applying tension to the endless chain 5 on the loose side (canary section) of the drive shaft may be provided. Good. The auto tensioner 17 has a rotatable pulley, and the pulley is disposed on the endless chain 5 to apply a downward force to increase the tension of the endless chain 5.

  Further, the endless chain 5 is disposed outside the track of the endless chain 5 at a position corresponding to the sprocket wheel 8a around the endless chain 5 provided on the drive shaft 8, and extends outward in the radial direction of the sprocket wheel 8a. The structure provided with the chain guide 16 which prevents this movement may be sufficient. Thereby, by providing the chain guide outside the track of the endless chain 5 wound around the sprocket wheel 8a, it is possible to prevent the endless chain 5 from being detached from the sprocket wheel 8a. In the event of an earthquake, the sludge scraper 100 is subject to vibration, and the risk of the endless chain 5 falling off can be reduced.

  In the sludge scraper 100 described above, the drive shaft 8 is disposed from the second driven shaft 7 in the longitudinal direction of the settling basin 1, but may be disposed from the first driven shaft 6. The first driven shaft 6 and the second driven shaft 7 may be arranged at the center.

  Further, the striker is not limited to the one provided with the roller portion, and may be a rod-like member not provided with the roller portion.

  DESCRIPTION OF SYMBOLS 1 ... Sedimentation basin, 1a ... Water surface, 2 ... Pond bottom, 4 ... Side wall, 5 ... Endless chain, 6 ... 1st driven shaft, 7 ... 2nd driven shaft, 8 ... Drive shaft, 16 ... Chain guide, 21,22 ... flight (scraping blade), 41 ... first striker, 42 ... second striker, 43 ... first striker support, 44 ... second striker support, 100 ... sludge scraper.

Claims (2)

A sludge scraping machine that scrapes the sludge accumulated in the sedimentation basin,
A plurality of scraping blades that scrape the sludge;
An endless chain to which the plurality of scraping blades are attached ;
A pair of driven shafts around which the endless chain is wound;
A drive shaft that is disposed above the pair of driven shafts, the endless chain is wound around, and a driving force is transmitted to the endless chain, and
The plurality of scraping blades are provided only in a portion corresponding to the pond bottom, reciprocate between the pair of driven shafts, and rotate around an axis extending in a direction intersecting a moving direction of the endless chain. By swinging, it is possible to change to a first posture in which the lower end of the scraping blade is close to the pond bottom or a second posture in which the lower end of the scraping blade is separated from the pond bottom . The sludge is raked in the posture of 1 and the sludge is not raked in the second posture when retreating ,
A first support extending from the outside of the moving path of the scraping blade toward the moving path;
The first support is supported by the first support and abuts against the scraping blade that advances in the first posture or the first projecting portion that projects from the scraping blade, and the scraping blade is pushed down to push the first A first striker that changes from the posture to the second posture;
A second support extending from the outside of the moving path of the scraping blade toward the moving path;
The second blade is supported by the second support and retreats in the second posture, or abuts against the second projecting portion that projects from the scraping blade, and raises the scraping blade to raise the second And a second striker that changes the posture from the first posture to the first posture . The endless chain is disposed outside the raceway of the endless chain at a position corresponding to the sprocket provided on the drive shaft and wound with the endless chain, thereby preventing the endless chain from moving outward in the radial direction of the sprocket. The sludge scraper according to claim 1 , further comprising a chain guide.

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