JP2013000651A - Sludge scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge scraper which prevents an endless chain from coming off from a rotating wheel even when an earthquake occurs.SOLUTION: The sludge scraper includes: the endless chain 11 which travels on a circumferential track in which a scraping track T1 along a basin bottom part 1d and a water surface track T4 extending on a water surface side are connected; sprockets 14, 15 which are arranged on both end parts of the water surface track T4 and rotate with a part of the endless chain 11 hooked; and a guide member 9 which is arranged in a periphery of a part of the endless chain 11 located on the water surface track T4. The endless chain 11 includes a plurality of projection parts 110a which project to a position overlapping with the guide member 9 in a basin width direction when viewed from above and are arranged along the circumferential track. The guide member 9 is arranged with an interval from the projection parts 110a above the projection parts 110a arranged on a part of the endless chain 11 located on the water surface track T4 between center shafts of the sprockets 14, 15, and has a length longer than the interval of arranging the projection parts 110a.

Description

  The present invention relates to a sludge collecting apparatus that is provided in a sedimentation basin in which sludge contained in received water settles at the bottom of a pond, and that sludges settled on the bottom of the pond by a flight plate extending in the pond width direction.

  As a sludge scraping device, a device is known in which a flight plate is attached to an endless chain partially wound around a rotating wheel such as a driving wheel or a driven wheel, and the endless chain is moved forward to circulate the flight plate. . The endless chain of the sludge scraping device travels on a circular track in which a scraping track extending along the bottom of the sedimentation basin and a water surface track extending toward the water surface are connected. The rotating wheels are arranged at both end portions of each track. The flight board collects sludge that has settled on the bottom of the pond when traveling on the bottom of the sedimentation basin, and scum that floats on the surface of the water when traveling on the water surface. On the water surface of the sedimentation basin, there are structures such as troughs and drainage basins that allow the scum attracted by the flight board to flow outside the sedimentation basin. Since it is necessary to install an endless chain while avoiding this structure, the distance that the water surface track extends is generally shorter than the distance that the raking track extends. For this reason, at least one of the two rotating wheels arranged at both ends of the water surface track has a small winding angle of the winding portion of the endless chain wound around the rotating wheel.

  By the way, in a sedimentation basin in which a sludge scraping device is installed, an endless chain may come off from a rotating wheel due to the influence of an earthquake. In particular, in a rotating wheel with a small wrapping angle around which an endless chain is wound, there is a problem in that the winding portion of the endless chain is likely to be removed.

  Patent Document 1 discloses a pin guide member in which an endless chain is provided with a connecting pin whose one end portion protrudes in the pond width direction, and is arranged at an interval in the radial direction of the protruding portion of the connecting pin. The pin guide member is provided on a winding portion of the endless chain that is wound around the rotating wheel. Patent Document 1 arranges the pin guide member so that the connecting pin in the hooked portion comes into contact with the pin guide member when the hooked portion of the endless chain is likely to come off the rotating wheel due to the shaking due to the earthquake. It is intended to prevent the endless chain from being removed.

  Patent Document 2 discloses a flight plate guide member. The flight plate guide member is disposed at an upward interval with respect to the upper end surface of the flight plate attached to the portion of the endless chain located in the water surface track (hereinafter referred to as the water surface track portion). And a portion arranged with a space in the pond width direction with respect to the end surface on the pond width direction side of the flight board. Patent Document 2 arranges a flight plate guide member so that the flight plate comes into contact with the flight plate guide member when the flight plate attached to the water surface track portion is likely to be displaced upward or in the pond width direction due to a shake due to an earthquake. By doing so, it is intended to suppress the upward displacement of the flight board and the displacement in the pond width direction.

JP 2011-78903 A JP 2006-326383 A

  However, the endless chain is removed from the rotating wheel because the effect of sloshing, where the water near the water surface in the sedimentation basin is greatly undulated by the earthquake, rather than the direct effect of shaking due to the earthquake, is greater than the present invention. From the research of the former. When sloshing occurs, the water surface track portion sways greatly, and the swaying force is transmitted to the winding portion of the endless chain, so that the endless chain may be removed from the rotating wheel. As described above, Patent Document 1 is a configuration in which a pin guide member is provided on a winding portion of an endless chain that is wound around a rotating wheel. With this configuration, it is not possible to suppress the water surface orbit portion from shaking. In addition, since at least one of the two rotating wheels arranged at both end portions of the water surface track has few winding portions, the range in which the pin guide member can guide the endless chain is also reduced. That is, in the configuration of Patent Document 1, since the guide range of the winding portion to which the force of the water surface track portion that is largely swung by sloshing is directly transmitted is small, the endless chain may not be prevented from being removed. Further, when the endless chain travels in the reverse direction in the direction opposite to the forward running direction, the trajectory of the endless chain during the reverse running changes from the path during the forward running. When traveling in the reverse direction, it is necessary to provide the pin guide member in a range where the pin guide member and the endless chain are not in contact with each other in consideration of the trajectory during the reverse rotation. The range that can be guided becomes extremely small, and even if this pin guide member is present, the endless chain may come off from the rotating wheel along with the sloshing.

  Since the configuration of Patent Document 2 is provided with the flight plate guide member along the water surface track, the flight plate attached to the water surface track part is suppressed to some extent from shifting upward or slacking in the pond width direction. can do. However, the flight plate guide member cannot suppress the flight plate rotation with the pond width direction as the rotation axis direction or the flight plate rotation with the vertical direction as the rotation axis direction. The suppressing effect is hardly obtained. For example, since the lower end portion of the flight plate moves upward and the flight plate cannot be inclined, the water surface track portion can freely move in the vertical direction. That is, in the configuration of Patent Document 2, it is not possible to prevent the water surface track portion from greatly shaking due to the sloshing, and a strong force due to the shaking is transmitted to the winding portion of the endless chain, and the endless chain may be removed from the rotating wheel. is there.

  In view of the above circumstances, an object of the present invention is to provide a sludge scraping device that can prevent an endless chain from being removed from a rotating wheel even if an earthquake occurs.

The first sludge squeezing device of the present invention that solves the above object is provided in a sedimentation basin in which sludge contained in received water settles at the bottom of the pond, and the sludge that has settled at the bottom of the pond extends in the pond width direction. In the sludge scraping device that scrapes by the existing flight board,
A plurality of the flight plates are attached at intervals, and an endless chain that travels on a circular track in which a scraping track extending along the pond bottom and a water surface track extending on the water surface side is connected;
Two rotating wheels that are disposed at both ends of the water surface track, each of which is wound around a part of the endless chain and rotates around a central axis;
A guide member disposed along the water surface in the vicinity of a portion of the endless chain located in the water surface track,
The endless chain is a plurality of protrusions protruding in the pond width direction and spaced apart along the orbit.
The guide member is vertically spaced above the protrusion provided on a portion of the endless chain located on the water surface track between the central axes of the two rotating wheels. The projections are arranged so as to overlap the projections, and have a length equal to or longer than the interval between the projections adjacent to each other.

  According to the first sludge squeezing device of the present invention, the protrusion provided in the portion of the endless chain located on the water surface track is restrained from moving upward by the guide member. By suppressing the protrusion from moving upward, even if sloshing occurs due to an earthquake, the upward movement of the portion is suppressed, and the portion can be prevented from shaking greatly in the vertical direction. Thereby, strong force due to shaking of the part is not transmitted to the winding part of the rotating wheel arranged at both ends of the part, and the endless chain is prevented from being detached from the rotating wheel.

  Further, a plurality of the projecting portions may be arranged along the circular orbit with an interval narrower than an interval at which the flight plate is attached.

The second sludge squeezing device of the present invention that solves the above object is provided in a sedimentation basin in which the sludge contained in the received water settles at the bottom of the pond, and the sludge that has settled at the bottom of the pond extends in the pond width direction. In the sludge scraping device that scrapes by the existing flight board,
A plurality of the flight plates are attached at intervals, and an endless chain that travels on a circular track in which a scraping track extending along the pond bottom and a water surface track extending on the water surface side is connected;
Two rotating wheels that are disposed at both ends of the water surface track, each of which is wound around a part of the endless chain and rotates around a central axis;
A guide member provided along the water surface and disposed in the vicinity of the portion of the endless chain located in the water surface track, and facing the portion with a gap in the pond width direction. It is characterized by being.

  According to the 2nd sludge scraping apparatus of this invention, it is suppressed by the guide member that the part located in a water surface track | orbit of an endless chain moves to a pond width direction. By suppressing the movement of the portion in the pond width direction, even if sloshing occurs due to an earthquake, it is possible to prevent the portion from shaking greatly in the pond width direction. Thereby, strong force due to shaking of the part is not transmitted to the winding part of the rotating wheel arranged at both ends of the part, and the endless chain is prevented from being detached from the rotating wheel.

Further, in the second sludge scraping device of the present invention, the endless chain is a plurality of protrusions protruding in the pond width direction and spaced apart along the circular trajectory,
The guide member may have a length that is equal to or greater than the interval between the adjacent protrusions in which the length of the portion disposed between the central axes of the two rotating wheels is adjacent.

  Also by doing this, it is possible to prevent the endless chain from being removed from the rotating wheels disposed at both ends of the endless chain located on the water surface track due to the effect of sloshing due to an earthquake.

  According to the sludge scraping device of the present invention, it is possible to prevent the endless chain from being removed from the rotating wheel even if an earthquake occurs.

It is a sectional side view of the sedimentation basin in which the sludge scraping apparatus which is one Embodiment of this invention was installed. It is the elements on larger scale which expanded the A section of FIG. It is a top view which shows a protection mechanism. It is the schematic which shows a mode that the endless chain was reverse-traveled. It is the elements on larger scale which expanded the B section of FIG. It is the top view which looked at some endless chains shown in Drawing 5, and some guide members from the upper part. It is CC sectional drawing of FIG. It is a figure which shows the 1st modification of this embodiment. It is a figure which shows the 2nd modification of this embodiment. It is a figure which shows the 3rd modification of this embodiment. It is a figure which shows the 4th modification of this embodiment. It is a figure which shows other embodiment, (a) is the figure which looked at the endless chain and guide member in a water surface track | orbit part from upper direction, (b) looked at the endless chain and guide member which are shown to (a) from the side. It is a figure.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side sectional view of a sedimentation basin in which a sludge scraping apparatus according to an embodiment of the present invention is installed.

  A sedimentation basin 1 shown in FIG. 1 is a pond having a substantially rectangular shape in plan view, surrounded by an upstream wall 1a, a downstream wall 1b, and a pair of side walls 1c. This sedimentation basin 1 accepts sewage such as sewage and rainwater from one end side in the longitudinal direction (left side in FIG. 1), sediments sludge contained in the received sewage into the pond bottom 1d, and the other end side (right side in FIG. 1). Drain from. Hereinafter, the left direction in FIG. 1 may be referred to as upstream, and the right direction in FIG. 1 may be referred to as downstream. Moreover, the direction orthogonal to the paper surface in FIG. 1 may be referred to as a pond width direction.

  As shown in FIG. 1, the sedimentation basin 1 is provided with a sludge scraping device 10, a scum removing device 30, a drainage basin 40, and a sludge pit 50 according to this embodiment. The drainage basin 40 is provided in the downstream part of the sedimentation basin 1, and the sludge pit 50 is provided in the upstream part of the sedimentation basin 1.

  The sludge scraping device 10 according to the present embodiment is provided at each of both ends of the sedimentation basin 1 in the pond width direction, and spans between a pair of endless chains 11 traveling in the sedimentation basin 1 and the pair of endless chains 11. And a protection mechanism 13 for preventing the flight plate 12 from contacting a trough 32 described later. Each of the endless chains 11 includes a scraping track T1 extending along the pond bottom 1d, a passing track T2 extending from the scraping track T1 toward the water surface W on the downstream side of the sedimentation basin 1, and an upstream side of the sedimentation basin 1. This is an annular chain that forms a circular track in which an upstream track T3 extending from the scraping track T1 toward the water surface W and a water surface track T4 connecting the upstream side and the downstream side are connected on the water surface W side. The water surface track T4 is a track extending substantially along the water surface in the vicinity of the water surface W. A guide extending substantially along the water surface W in the vicinity of both sides in the pond width direction of a portion of each endless chain 11 located on the water surface track T4 (which may be referred to as a water surface track portion 11a in the following description). A member 9 is provided. The guide member 9 will be described in detail later. The passing trajectory T <b> 2 is a trajectory that is below the trough 32 and passes through the vicinity of the trough 32. In addition, in FIG. 1, the endless chain 11 is shown by the said circulation track | orbit.

  Sprockets 14 to 17 that connect the tracks T1 to T4 are arranged at both ends of the tracks T1 to T4. These sprockets 14-17 are arrange | positioned inside the said circumference track. A part of the endless chain 11 is wound around each of the sprockets 14 to 17, and a portion of the endless chain 11 wound around each of the sprockets 14 to 17 meshes with the sprockets 14 to 17. .

  The sprocket 14 is disposed at a connection portion between the upstream track T3 and the water track T4. In the following description, this sprocket 14 may be referred to as a drive sprocket 14. A drive shaft 141 is fixed to the center portion of the drive sprocket 14. The drive shaft 141 is connected to the motor 21 by a drive chain 211. As the motor 21 rotates, the drive sprocket 14 also rotates via the drive shaft 141. In other words, the drive sprocket 14 is a drive wheel that transmits the driving force of the motor 21 and causes the endless chain 11 to travel. The motor 21 is a motor that can rotate in both the clockwise direction and the counterclockwise direction in FIG. The motor 21 is normally driven to rotate clockwise in FIG. As the motor 21 rotates in the clockwise direction, the drive sprocket 14 and the endless chain 11 usually run in the clockwise direction. Hereinafter, the endless chain 11 traveling clockwise in FIG. 1 is referred to as forward running. On the other hand, the motor 21 has a torque limiter function. For example, if a foreign object is caught in the flight plate 12 attached to the endless chain 11 running on the pond bottom 1d and an excessive load is applied to the motor 21, the torque limiter function is activated and the motor 21 is temporarily stopped. . Then, in order to release the foreign matter from being caught, the motor 21 rotates reversely (rotates counterclockwise in FIG. 1) for a short time. As the motor 21 rotates in the reverse direction, the endless chain travels counterclockwise in FIG. Hereinafter, the endless chain 11 traveling counterclockwise in FIG. 1 is referred to as reverse traveling.

  The other sprockets 15 to 17 are driven wheels that rotate as the endless chain 11 travels. Fixed shafts 151, 161, and 171 are passed through the central portions of the sprockets 15 to 17 of the driven wheels. The fixed shafts 151, 161, 171 are fixedly arranged so as not to rotate around the shaft. The driven wheel sprockets 15 to 17 are all rotatable with respect to the fixed shafts 151, 161 and 171. Each of the sprockets 14 to 17 rotates with the drive shaft 141 and the fixed shafts 151, 161, 171 as rotation axes. In the following description, the sprocket 15 arranged at the connection portion between the water surface track T4 and the passing track T2 may be referred to as an intermediate sprocket 15, and the fixed shaft 151 passed through the intermediate sprocket 15 may be referred to as an intermediate shaft 151. Of these sprockets 14 to 17, the drive sprocket 14 and the intermediate sprocket 15 at both ends of the water surface track T4 correspond to an example of a rotating wheel according to the present invention.

  The flight plate 12 is attached to the entire circumference of the endless chain 11 with a uniform or substantially uniform spacing in the circumferential direction. A pond bottom rail 23 extending in the longitudinal direction of the settling basin 1 along the pond bottom 1 d is fixed to the pond bottom 1 d of the settling pond 1. The flight plate 12 attached to the endless chain 11 travels while being guided by the pond bottom rail 23 on the scraping track T1. In addition, a downstream return rail 25 that is substantially parallel to the pond bottom 1d and extends in the longitudinal direction of the settling basin 1 is fixed to a predetermined height position from the pond bottom 1d on the downstream side of the settling basin 1. ing. The downstream return rail 25 is attached to a downstream pedestal 251 fixed to the pair of side walls 1c. When the endless chain 11 is traveling forward, the flight plate 12 attached to the endless chain 11 travels while being guided by the downstream return rail 25 on the downstream side of the passing track T2. Further, in FIG. 1, most of the part is hidden by the guide member 9, but upstream of the sedimentation basin 1 and in the vicinity of the water surface W, the upstream extending along the water surface W in the longitudinal direction of the sedimentation basin 1. The side return rail 24 is fixed. The upstream return rail 24 is attached to an upstream pedestal 241 fixed to the pair of side walls 1c. The flight plate 12 attached to the endless chain 11 travels while being guided by the upstream return rail 24 in the water surface track T4.

  When the endless chain 11 travels forward, the flight plate 12 travels from the downstream side toward the upstream side along the raking track T1 along the pond bottom 1d, and the sludge settled on the pond bottom 1d is It is scraped to the sludge pit 50. Since the sludge settled on the pond bottom 1d needs to be squeezed from the downstream end of the sunk basin 1 to the sludge pit 50 provided upstream, the scouring track T1 extends over almost the entire length of the pond bottom 1d in the longitudinal direction. Orbit. The sludge attracted to the sludge pit 50 is discharged outside the sedimentation basin 1 by a sludge pump (not shown).

  FIG. 2 is a partially enlarged view in which the portion A of FIG. 1 is enlarged.

  As shown in FIG. 2, the scum removing device 30 includes a weir 31 and a trough 32. The trough 32 is a U-shaped structure with an upper end portion opened in a side view, and a lower end portion thereof is located below the water surface W. The trough 32 extends across the settling basin 1 in the pond width direction to a scum pit (not shown) provided outside the settling basin 1. The upstream side wall 321 of the trough 32 is provided with a filling port 322 for swallowing water in the vicinity of the water surface W of the sedimentation tank 1. A predetermined water level higher than the lower end portion of the insertion port 322 is the lowest water level of the sedimentation tank 1. The weir 31 is connected to the trough 32 by a connecting member 33 so as to be rotatable with respect to the trough 32 with the lower end as a rotation center. The weir 31 changes its state between a dammed state in which the upper end is located above the water surface W and a swallowed state in which the upper end is submerged in water. The weir 31 shown in FIG. 2 is in a dammed state. The weir 31 prevents the water in the sedimentation basin 1 from flowing into the trough 32 from the inlet port 322 in the dammed state. When the upper end of the weir 31 in the dammed state is pushed down by a drive mechanism (not shown), the weir 31 is rotated about the lower end as a center of rotation, and is in a pinched state.

  Scum is floating on the water surface W of the sedimentation basin 1. When the endless chain 11 travels forward, the flight plate 12 travels on the water surface track T4 from the upstream side toward the downstream side, and the scum floating on the water surface W of the settling basin 1 is transferred by the flight plate 12 toward the weir 31. Is done. When the weir 31 is in a stagnation state, the scum flows into the trough 32 over the upper end of the weir 31 together with the water in the settling basin 1. Since the water surface track T4 needs to be disposed upstream of the trough 32 while avoiding structures such as the trough 32 and the drainage basin 40, the distance the water surface track T4 extends is determined by the scraping track T1. Shorter than the extended distance.

  The inner bottom surface of the trough 32 is inclined downward toward a scum pit (not shown) outside the sedimentation basin 1. The scum-mixed water mixed with the scum flows inside the trough 32 and reaches the scum pit. In addition, the water in the sedimentation basin 1 from which the scum and sludge have been removed passes under the trough 32 and flows into the drainage basin 40, flows from the drainage basin 40 to a drainage channel (not shown), and is drained outside the sedimentation basin 1. The

  The protection mechanism 13 includes a pair of protection rails 18, a support shaft 19 that supports the protection rail 18 in a swingable manner, and a restriction shaft 20 that restricts the swing range of the protection rail 18. The protective rail 18 is a rail member having an arcuate shape in a side view extending in the intersecting direction intersecting the pond width direction between the passing track T2 and the trough 32. The protective rail 18 prevents the flight plate 12 attached to the portion of the endless chain 11 traveling on the passing track T2 and the trough 32 from contacting each other. A bearing 181 through which the support shaft 19 is passed is fixed to each protection rail 18. Each protection rail 18 is supported by the support shaft 19 so as to be swingable with the support shaft 19 as a swing center axis. In addition, a restriction shaft 20 is passed through one end portion (left end portion in FIG. 2) of each protection rail 18.

  FIG. 3 is a plan view showing the protection mechanism. In FIG. 3, an endless chain 11 and a flight plate 12 are also shown.

  As shown in FIG. 3, each protection rail 18 is arranged near the pair of side walls 1 c of the settling basin 1 and closer to the center of the pond width direction than the end surface of the flight board 12 in the pond width direction. The protective rail 18 may be arranged in another position as long as the protective rail 18 and the flight plate 12 overlap in a plan view, for example, the end position of the endless chain 11 in the plan view. You may arrange | position in the position which overlaps. Both end portions in the longitudinal direction of the support shaft 19 are fixed to the side walls 1c of the settling basin 1, respectively. On each side wall 1c of the settling basin 1, a regulation guide 201 having a groove 201a recessed in the pond width direction is fixed. Both ends of the restriction shaft 20 are inserted into each groove 201a. As shown in FIG. 2, the groove 201 a has a substantially sector shape when viewed from the side. By restricting the movement range of the restriction shaft 20 by the groove portion 201a, the swing range of the protective rail 18 is restricted.

  The center of gravity of the protection rail 18 is present at one end side portion (left side portion in FIG. 2) of the support shaft 19, and the regulation shaft 20 and the protection rail 18 passed through the one end portion of the protection rail 18 are: It is made of a material having a specific gravity greater than that of water (for example, stainless steel). Therefore, the weight of the protective rail 18 and the weight of the regulating shaft 20 act in the direction in which the protective rail 18 is swung counterclockwise in FIG. That is, a rotational moment is generated in the protective rail 18 such that one end side portion of the protective rail 18 rotates toward the endless chain 11 with respect to the weight of the protective rail 18 and the weight of the restriction shaft 20.

  In the initial state in which the endless chain 11 is first installed in the sedimentation basin 1, the endless chain 11 is wound around the sprockets 14 to 17 in a state where an appropriate tension (for example, 100 kgf) is applied. The solid line in FIG. 2 shows the initial state. On the other hand, the endless chain 11 may be secularly changed due to the familiarity of the endless chain 11 or a creep phenomenon. A two-dot chain line in FIG. 2 shows a state where the endless chain 11 is extended.

  The protective rail 18 is in contact with any one or a plurality (two in this case) of the flight plates 12 attached to the endless chain 11 from the outside of the orbit. In the initial state, the protection rail 18 is pushed toward the outside of the orbital track by the tension of the endless chain 11 and is in a retracted position retracted to the outside (the trough 32 side) of the orbital track. However, the swing range of the protection rail 18 is restricted by the restriction guide 201 so that the protection rail 18 and the trough 32 do not contact each other, and a gap is provided between the protection rail 18 and the trough 32 in the retracted position. ing. Further, since the protective rail 18 is interposed between the trough 32 and the flight plate 12, a predetermined distance is maintained between the flight plate 12 and the trough 32. That is, the protection rail 18 prevents the flight plate 12 and the trough 32 from contacting each other.

  When the endless chain 11 travels, a traveling load generated by the flight plate 12 scraping sludge is applied to the portion of the endless chain 11 located on the scraping track T1. When the endless chain 11 is traveling forward, a tension corresponding to the travel load is generated in a portion of the endless chain 11 located on the scraping track T1 and the upstream track T3. On the other hand, in the portion of the endless chain 11 that is located on the passing track T2 and the water surface track T4, the tension applied to the endless chain 11 in the initial state decreases as the endless chain 11 extends.

  In a state where the endless chain 11 is extended, as shown by a two-dot chain line in FIG. 2, the protective rail 18 follows the extension of the endless chain 11 and swings around the support shaft 19 as a swing center axis. Is in contact with the flight plate 12 from the outside of the orbit. Further, the contact portion of the protective rail 18 with the flight plate 12 advances toward the inside of the circuit track by the rotational moment generated in the protective rail 18, thereby pushing the flight plate 12 and applying tension to the endless chain 11. Has been granted. Further, the endless chain 11 is pressed against the intermediate sprocket 15 by the protective rail 18 pushing the flight plate on the passing track T2 into the inside of the circular track. This makes it difficult for the endless chain 11 to be separated from the intermediate sprocket 15, and even if an earthquake or sloshing due to an earthquake occurs, the endless chain 11 is prevented from being detached from the intermediate sprocket 15 to some extent.

  FIG. 4 is a schematic view showing a state in which the endless chain is run in reverse.

  As shown in FIG. 4, due to the reverse rotation of the motor 21, the portions of the endless chain 11 that are located on the passing track T <b> 2 and the water surface track T <b> 4 are pulled by the drive sprocket 14 and become in a tension state without sagging. In this tensioned state, the tension of the portion of the endless chain 11 located on the passing track T2 is larger than the tension that the protective rail 18 has applied to the endless chain 11 during forward running. For this reason, the protective rail 18 is pushed back by the flight plate 12 attached to the endless chain 11 at the portion located on the passing track T2, and is retracted to the limit of the swinging range outside the circular track. Since the swinging range of the protective rail 18 is restricted by the restriction guide 201 so as not to come into contact with the trough 32, the protective rail 18 and the trough 32 are prevented from colliding. In addition, since the flight plate 12 is maintained at a predetermined distance from the trough 32 by the protective rail 18, the flight plate 12 and the trough 32 do not collide even when traveling in reverse. In the tensioned state, the endless chain 11 is slackened on the upstream track T3.

  When the portions of the endless chain 11 located on the passing track T2 and the water surface track T4 are in tension, the downstream side portion of the endless chain 11 that is wound around the intermediate sprocket 15 during forward running is It moves away from the intermediate sprocket 15 and moves upward than during forward running. In the case where a guide member for preventing wheel disengagement is provided in the winding portion, it is necessary to provide the guide member in a range where the downstream portion does not come into contact during reverse running in consideration of the upward movement.

  FIG. 5 is a partially enlarged view in which the portion B in FIG. 1 is enlarged. In FIG. 5, the direction orthogonal to the paper surface is the pond width direction.

  The endless chain 11 is a metal chain in which the link member 110 is connected by a connecting pin 111. A resin chain may be used as the endless chain 11. As shown in FIG. 5, in this embodiment, the winding angle at which the endless chain 11 is wound around the drive sprocket 14 is about 90 degrees. The winding angle at which the endless chain is wound around the intermediate sprocket 15 is about 45 degrees. However, as described above, when the endless chain 11 is traveling in reverse, the winding angle of the endless chain 11 around the intermediate sprocket 15 is smaller than the winding angle shown in FIG. The winding angle of the endless chain 11 wound around the sprockets 14 to 17 is preferably larger in order to prevent tooth skipping and wheel removal. The reason why the winding angle of the intermediate sprocket 15 is small is that, as described above, the distance that the water surface track T4 extends is shorter than the distance that the scraping track T1 extends. Sloshing is a phenomenon in which the liquid level fluctuates most near the water surface W. For this reason, the endless chain 11 is easily removed from the winding portion that is wound around the intermediate sprocket 15 that exists at the end of the water surface track T4 and has a small winding angle.

  In the present embodiment, the link member 110 provided with the stay 1101 is arranged every 20 link members 110 connected in the circumferential direction of the endless chain 11. The flight plate 12 is a U-shaped plate member extending in the pond width direction. As described above, the endless chain 11 is disposed at each of both ends of the pond width direction. The endless chain 11 arranged on one end side in the pond width direction and the endless chain 11 arranged on the other end side in the same direction form the same orbit. Both end portions of the flight plate 12 in the pond width direction are attached to stays 1101 provided on the link members 110 in the endless chain 11 disposed at both ends of the pond width direction via attachment members 1102. Therefore, the number of all connection pins 111 included in the endless chain 11 is larger than the number of all flight plates 12 attached to the endless chain 11. In the present embodiment, the interval in the orbit where the flight plate 12 is attached is about 3 m, and the interval in the orbit of the connecting pin 111 is about 15 cm. The circular orbit formed by the endless chain 11 corresponds to a locus connecting adjacent connecting pins 111 of the endless chain 11 shown in FIG.

  Guide members 9 are provided on both sides in the pond width direction of the water surface track portion 11a of the endless chain 11 with a space from the water surface track portion 11a. The guide member 9 is a member that suppresses the movement of the water surface track portion 11a. As shown in FIG. 5, the guide member 9 extends substantially along the water surface W from directly above the axis of the drive shaft 141 to directly above the axis of the intermediate shaft 151. That is, the length of the guide member 9 in the extending direction is the same as the distance between the drive shaft 141 and the intermediate shaft 151. The guide member 9 is attached to a plurality of upstream pedestals 241 fixed to each of the pair of side walls 1c.

  FIG. 6 is a plan view of a part of the endless chain and a part of the guide member shown in FIG. 5 as viewed from above.

  As shown in FIG. 6, the link member 110 constituting the endless chain 11 is a barrel having a pair of link plates 112 facing in the pond width direction (left and right direction in FIG. 6) having through holes extending in the pond width direction. This is a member connected by the portion 113. That is, the endless chain 11 has a plurality of link members 110 provided with through holes and a plurality of connection pins 111, and connects the link members 110 by inserting the connection pins 111 into the through holes between the link members 110. It is made. The connecting pin 111 is inserted into these through holes in a state where the through holes of two adjacent link members are aligned with each other, and outside the pair of link plates 112, a nut 115 for preventing the connecting pins 111 from coming off. It is fixed. The connecting pin 111 fixed by the nut 115 cannot rotate with respect to the link plate 112. The nut 115 is a position restricting member for restricting the position of the connecting pin 111 in the extending direction. The connecting pin 111 has a protruding portion 111a that protrudes further outward from the nut 115 in the opposite direction to the link member 110 at both ends. The protrusion 111a in the present embodiment corresponds to an example of the protrusion of the present invention. The diameter of the protrusion 111a is equal to or smaller than the diameter of the through hole of the link member 110. In place of the nut 115, a head having a diameter larger than the diameter of the through hole is provided on one end side of the connecting pin 111, and a stopper pin that is longer than the diameter of the through hole is disposed on the other end side. It may be an embodiment. This also regulates the position of the connecting pin 111 in the extending direction. Further, the retaining pin prevents the connecting pin 111 from functioning as a detent pin that restricts rotation of the connecting pin 111 relative to the link plate 112. In this embodiment, the connecting pin 111 has a protruding portion that protrudes further outward from the head, and also has a protruding portion that protrudes further outward from the retaining pin.

  The teeth of the sprockets 14 to 17 enter between the pair of link plates 112. In the drive sprocket 14 that rotates together with the drive shaft 141, the rotation driving force of the drive sprocket 14 is transmitted to the link member 110 by engaging the edge on the downstream side in the rotation direction of the teeth with the barrel portion 113, and the endless chain 11 travels around the circular track. Run.

  As shown in FIG. 6, the axial direction in which the connecting pin 111 extends is parallel or substantially parallel to the pond width direction. The guide member 9 is arrange | positioned at the pond width direction both sides of the water surface track | orbit part 11a. The guide member 9 is an L-shaped plate member whose cross section in the vertical direction (the direction orthogonal to the paper surface in FIG. 6) is turned upside down. In the following description, the portion of the guide member 9 whose vertical direction is the thickness direction is referred to as an upward restriction portion 91, and the portion whose pond width direction is the thickness direction is referred to as a pond width direction restriction portion 92. In FIG. 6, the surface of the upward restriction portion 91 is shown.

  The protruding portions 111a of all the connecting pins 111 included in the endless chain 11 shown in FIG. 6 protrude from the link member 110 to a position where it overlaps with the guide member 9 when viewed from above. Yes. In addition, although the protrusion part 111a provided in each both ends of the connection pin 111 is arrange | positioned at intervals at the radial direction of the upper direction control part 91 and the protrusion part 111a, this point is mentioned later.

  Moreover, the pond width direction restriction | limiting part 92 of the guide member 9 shown in FIG. 6 arrange | positions the protrusion part 111a provided in each of the both ends of the connection pin 111 in the water surface track part 11a with the space | interval S1 in the pond width direction. Has been. This interval S1 is designed to be a narrow interval in a range in which the end surface 111b of the connecting pin 111 does not contact the pond width direction restricting portion 92 when the endless chain 11 is traveling normally. That is, the pond width direction restricting portion 92 in the present embodiment is configured such that the end surface 111b of the connecting pin 111 is moved when the endless chain 11 is swung in the pond width direction beyond the range where the endless chain 11 normally travels due to shaking or sloshing due to an earthquake. It is arrange | positioned so that it may contact | abut. In the present embodiment, the protruding portions 111 a are provided on all the connecting pins 111. The protrusion 111a and the guide member 9 in the water surface track portion 11a suppress the movement of the water surface track portion 11a in the pond width direction. Therefore, even if sloshing occurs due to an earthquake, the water surface orbit portion 11a does not shake significantly. Thereby, it is possible to prevent a strong force caused by the shaking of the water surface track portion 11 a from being transmitted to the winding portion of the endless chain 11 and causing the winding portion of the endless chain 11 to escape from the drive sprocket 14 or the intermediate sprocket 15.

  7 is a cross-sectional view taken along the line CC of FIG. Therefore, in FIG. 7, the back side of the drawing is the downstream side of the settling basin, and the horizontal direction in the figure is the pond width direction. In FIG. 7, the intermediate sprocket 15 and the intermediate shaft 151 are not shown.

  An upstream pedestal 241 is provided on the side wall 1 c of the sedimentation basin 1 at a position avoiding the circulation track of the endless chain 11 and the flight plate 12. The guide members 9 disposed on both sides of the water surface track portion 11a in the pond width direction are attached to the upstream pedestal 241.

  FIG. 7 shows that the guide member 9 is an L-shaped plate member that is turned upside down. Moreover, as shown in FIG. 7, the upper direction restriction | limiting part 91 of the guide member 9 is arrange | positioned at intervals S2 above the protrusion part 111a provided in each of the both ends of the connection pin 111 in the water surface track part 11a. Has been. In the present embodiment, when the endless chain 11 is traveling normally, the interval S2 is narrow within a range in which the peripheral surface of the protruding portion 111a of the connecting pin 111 does not come into contact with the upward restricting portion 91. Designed to. In other words, the upper restricting portion 91 in the present embodiment makes contact with the peripheral surface of the protruding portion 111a when the endless chain 11 is swung in the vertical direction beyond the range in which the endless chain 11 normally travels due to shaking or sloshing due to an earthquake. It is arranged like this. The protrusion 111a and the guide member 9 in the water surface track portion 11a suppress the movement of the water surface track portion 11a in the vertical direction. Therefore, even if sloshing occurs due to an earthquake, the water surface orbit portion 11a does not shake significantly. Thereby, it is possible to prevent a strong force caused by the shaking of the water surface track portion 11 a from being transmitted to the winding portion of the endless chain 11 and causing the winding portion of the endless chain 11 to escape from the drive sprocket 14 or the intermediate sprocket 15.

  Note that, without providing the protrusions 111a on all of the connection pins 111, for example, the connection pins 111 with the protrusions 111a and the connection pins 111 with the protrusions 111a omitted may be alternately arranged. However, the narrower the interval at which the connecting pins 111 having the protruding portions 111a are arranged, the smaller the swinging motion of the water surface track portion 11a can be reduced. Therefore, the protruding portions 111a are spaced at least at intervals smaller than the intervals at which the flight plates 12 are provided. It is preferable to arrange a connecting pin 111 having a certain length.

  FIG. 7 also shows a state in which the pond width direction restricting portion 92 of the guide member 9 is arranged with an interval S1 from the endless chain 11 in the pond width direction. Due to the shaking or sloshing caused by an earthquake, the water surface orbit portion 11a may behave unexpectedly, for example, the connecting pin 111 may float while being inclined. By providing the pond width direction restricting portion 92, the water surface track portion 11a can be prevented from swinging in the pond width direction, and the endless chain 11 can be reliably prevented from being removed from the sprockets 14 and 15. . In particular, when the interval S2 is long, or when the upward restriction portion 91 is omitted, the pond width direction restriction portion 92 is effective.

  The guide member 9 described above is disposed at a position deviated from the water surface track portion 11a, and is separated from the protruding portion 111a of the connecting pin 111 in both the extending direction and the radial direction of the connecting pin 111. That is, the upper direction restricting portion 91 is opposed to the peripheral surface of the protruding portion 111a of the connecting pin 111 with an interval from above, and the pond width direction restricting portion 92 is opposed to the end surface 111b of the connecting pin 111 in the pond width direction. Facing each other with a gap.

  Further, as described above, the connecting pin 111 is fixed to the link member 110 by the nut 115. The projecting length L of the connecting pin 111 from the nut 115 to the projecting tip is preferably 5 mm or more and 30 mm or less. If the protruding length L is less than 5 mm, it is difficult to suppress the upward swinging motion of the water surface track portion 11a because the length of the end of the connecting pin 111 contacting the upward restricting portion 91 is too short. become. On the other hand, if the protruding length L exceeds 30 mm, dust or the like may be caught on the protruding portion 111a of the connecting pin 111, which may interfere with sludge collection. Further, the pond width direction restricting portion 92 of the guide member 9 is disposed with an interval S1 in the pond width direction from the endless chain 11, and the length of the interval S1 is equal to or shorter than the protruding length L. It is preferable. Thus, when the water surface orbit portion 11a is shaken due to shaking or sloshing due to an earthquake, the end surface 111b of the connecting pin 111 comes into more reliable contact with the pond width direction regulating portion 92 from the pond width direction.

  In the above description, the end surface 111b of the connecting pin 111 comes into contact with the pond width direction restricting portion 92 when the water surface track portion 11a moves in the pond width direction beyond the range in which the water surface orbit portion 11a normally travels due to shaking or sloshing due to an earthquake. Is provided with an interval S1. The interval S3 may be determined so that the link plate 112 abuts against the guide member 9 instead of the end surface 111b of the connecting pin 111. That is, as shown in FIG. 7, the upper restricting portion 91 of the guide member 9 is bent 90 degrees from the pond width direction restricting portion 92, and the tip thereof faces the link plate 112. The interval S3 in the pond width direction between the link plate 112 and the tip of the upper restriction portion 91 is set to be smaller than the interval S1 in the pond width direction between the end surface 111b of the connecting pin 111 and the pond width direction restriction portion 92, When the water surface track portion 11a moves in the pond width direction due to shaking or sloshing caused by the above, the link plate 112 may be brought into contact with the tip of the upward restricting portion 91. Alternatively, the interval S3 and the interval S1 may be the same length.

  The flight plate 12 protrudes to the outer periphery of the endless chain 11, and a tip shoe 121 is attached to the protruding tip edge 12a. A return shoe 122 is attached to the rear end edge 12b opposite to the protruding front end edge 12a. The tip shoe 121 and the return shoe 122 are detachably attached to the flight plate 12 so that they can be replaced when worn. The flight board 12 passing through the scraping track T1 travels along the pond bottom by the tip shoe 121 being in sliding contact with the pond bottom rail 23 (see FIG. 1). The flight plate 12 passing through the downstream portion of the passing track T2 travels along the downstream return rail 25 by the return shoe 122 being in sliding contact with the downstream return rail 25 (see FIG. 1). Go. Furthermore, the flight board 12 passing through the water surface track T4 travels along the upstream return rail 24 by being in sliding contact with the upstream return rail 24 attached to the upstream pedestal 241. Since the upstream return rail 24 extends along the water surface W, the flight plate 12 passing through the water surface track T4 travels along the water surface W.

  In the description so far, the guide member 9 is provided between the position directly above the axis of the drive shaft 141 and the position just above the axis of the intermediate shaft 151, but the endless chain 11 shown in FIG. You may extend the guide member 9 to the winding part of the drive sprocket 14 and the intermediate | middle sprocket 15 which are shown.

  Then, the modification of this embodiment is demonstrated. In the following description, components having the same names as those of the components described so far will be described with the same reference numerals as those used so far. Moreover, the description which overlaps with the description of the sludge scraping apparatus already demonstrated may be abbreviate | omitted.

  FIG. 8 is a diagram illustrating a first modification of the present embodiment.

  In the first modification, the guide member 9 is disposed only on one end side in the pond width direction of the water surface track portion 11a. The connecting pin 111 has a protruding portion 111a protruding from the nut 115 only on the side where the guide member 9 is provided. A roller 116 is provided on the protruding portion 111a. The roller 116 is made of an elastic material and is rotatably attached to the connecting pin 111. The roller 116 may be made of resin or metal. Further, as described above, the connecting pin 111 fixed by the nut 115 cannot rotate with respect to the link member 110. By providing the roller 116 that is rotatable with respect to the connecting pin 111, the frictional resistance when the connecting pin 111 abuts on the upward restricting portion 91 is reduced.

  In addition, the upward restricting portion 91 in this modified example is bent 90 degrees from the pond width direction restricting portion 92, and the tip end portion 91 a is further bent 90 degrees toward the connecting pin 111. As a result, the roller 116 having a diameter larger than the diameter of the connecting pin 111 is surrounded by the guide member 9 with an interval in the pond width direction. Thus, even if the guide member is provided only on one side, the movement of the water surface track portion 11a on either side of the pond width direction can be suppressed. In addition, the vertical interval between the outer periphery of the roller 116 and the upward restricting portion 91 opposed to the outer periphery of the roller 116 is narrower than the vertical interval between the bent tip portion 91a of the upward restricting portion 91 and the connecting pin 111. Therefore, when the water surface track portion 11 a moves upward, the roller 116 comes into contact with the upward restriction portion 91.

  FIG. 9 is a diagram showing a second modification of the present embodiment.

  In the second modification, the upstream return rail 24 is omitted, and one of the guide members 9 has the function of the upstream return rail 24. As shown in FIG. 9, the guide member 9 of this modified example has an inclined portion 93 inclined upward from the upper end of the pond width direction restricting portion 92 and toward the side wall 1c, and from the upper end of the inclined portion 93 toward the side wall 1c. And a horizontal portion 94 extending horizontally. The horizontal portion 94 acts as a return rail that guides the flight plate 12 on the water surface track T4. The flight plate 12 passing through the water surface track T4 is guided by the horizontal portion 94 and travels when the return shoe 122 provided on the flight plate 12 is in sliding contact with the horizontal portion 94.

  Note that. In this modification, since the upward restriction portion 91 is omitted, the protruding portion 111a is not necessarily provided. That is, when the water surface track portion 11a moves in the pond width direction, the nut 115 or the link plate 112 may be in contact with the pond width direction regulating portion 92. Also by doing so, the movement of the water surface track portion 11a in the pond width direction can be suppressed by the pond width direction regulating portion 92.

  According to this modification, since the upstream return rail 24 can be omitted, the number of parts of the sludge scraping device 10 can be reduced, and the cost of the sludge scraping device 10 can be reduced. In this modification, the upper direction restricting portion 91 is also omitted, but the upper direction restricting portion 91 may be attached to the upper end of the pond width direction restricting portion 92 by welding or the like.

  FIG. 10 is a diagram illustrating a third modification of the present embodiment.

  In the third modification, the guide member 9 is divided, and the guide member 9 is omitted from the central portion in the extending direction of the water surface track portion 11a. One of the divided guide members 9 extends in the direction of the intermediate sprocket 15 substantially along the water surface W on both sides in the pond width direction of the water surface track portion 11a from directly above the axis of the drive shaft 141. Further, the other divided guide member 9 extends in the direction of the drive sprocket 14 substantially along the water surface W on both sides in the pond width direction of the water surface track portion 11a from directly above the axis of the intermediate shaft 151. The length of each guide member 9 in the extending direction is about five times as long as the interval at which the connecting pins 111 are provided. According to the sludge scraping device 10 of this modified example, even when sloshing occurs due to an earthquake and the central portion in the extending direction of the water surface track portion 11a swings, the swinging motion is suppressed and reduced at a portion where the guide member 9 is present. Become. As a result, the swaying force transmitted to the end portion of the endless chain 11 that wraps around the drive sprocket 14 or the intermediate sprocket 15 becomes weak, and the endless chain 11 can be prevented from being detached from the drive sprocket 14 and the intermediate sprocket 15. .

  In addition, the length of the extending direction of each guide member 9 should just be longer than the space | interval of the connection pin 111 in which the adjacent protrusion part 111a was provided along the circumference track. This is because when the water surface track portion 11a moves due to shaking or sloshing due to an earthquake, the protruding portion 111a contacts the guide member 9 regardless of the position of the connecting pin 111 provided with the protruding portion 111a. . However, as the length of each guide member 9 in the extending direction is longer, the swinging motion of the water surface track portion 11a can be further suppressed. Accordingly, it is preferable that the length of the guide member 9 in the extending direction is as long as possible.

  In this modification, the guide member 9 is divided into two, but the guide member 9 may be divided into three or more. When divided into three or more, it is preferable to provide the guide member 9 also near the center where the water surface track portion 11a extends. By providing the guide member 9 in the vicinity of the center of the water surface track portion 11a, the amplitude of the water surface track portion 11a caused by shaking or sloshing caused by an earthquake can be divided near the center to reduce the amplitude.

  FIG. 11 is a diagram illustrating a fourth modification of the present embodiment. In FIG. 11, the upstream return rail 24 is omitted.

  In the fourth modification, the length of the guide member 9 in the extending direction is shortened. One end surface 9a in the extending direction of the guide member is located on the intermediate shaft 151 side by a distance D1 from the axis of the drive shaft 141. The other end surface 9b in the extending direction of the guide member is located on the drive shaft side by a distance D2 from the axis of the intermediate shaft 151. When sloshing occurs due to an earthquake, the endless chain 11 between the end faces 9a and 9b of the guide member 9 and the winding portion swings with an amplitude corresponding to the distances D1 and D2. When these distances D1 and D2 are long distances, the swinging motion in the endless chain 11 between the end faces 9a and 9b of the guide member 9 and the winding portion becomes large, and the endless chain 11 becomes the drive sprocket 14 and the intermediate sprocket 15. There is a risk that the wheel will come off. That is, as the distances D1 and D2 are shorter, the swinging motion in the endless chain 11 between the end faces 9a and 9b of the guide member 9 and the winding portion can be reduced. The interval is preferably shorter than the interval at which the plates 12 are provided. The distances D1 and D2 are more preferably shorter than the distance between the connecting pins 111 provided with the protruding portions 111a.

  Next, a sludge scraping apparatus according to another embodiment will be described. In the following description, components having the same names as those of the components described so far are described using the same reference numerals as those used so far. Moreover, the description which overlaps with the description of the sludge scraping apparatus of previous embodiment may be abbreviate | omitted.

  12A and 12B are diagrams showing another embodiment, in which FIG. 12A is a view of the endless chain and guide member in the water surface track portion as viewed from above, and FIG. 12B is a view of the endless chain and guide member shown in FIG. It is the figure seen from the side. In FIG. 12A, the flight board 12 and the mounting member 1102 for the flight board 12 are not shown.

  In the previous embodiment, the protrusion 111a is provided on the connecting pin 111, but in the sludge scraping device 10 of this other embodiment, the protrusion 110a is provided on the link member 110 of the endless chain 11. The protrusion 110a in the present embodiment corresponds to an example of the protrusion of the present invention. The endless chain 11 is a so-called notch chain made of resin. As shown in FIG. 12A, each of the plurality of link members 110 constituting the endless chain 11 has a pair of link plates 112 facing each other in the pond width direction (vertical direction in FIG. 12A). It is a member connected by a barrel portion 113 having a through hole extending in the direction. Each link member 110 is connected by a connecting pin 111. The connecting pin 111 is provided with a head portion 111d having a diameter larger than the diameter of the through hole on one end side and a small diameter portion 111e having a diameter smaller than the diameter of the through hole on the other end side. As shown in FIG. 12 (b), the head portion 111 d has an oval shape in which two cutout portions are provided, and the cutout portion engages with a rotation stop portion 110 b provided in the link member 110. is doing. Due to this engagement, the connecting pin 111 is not rotatable with respect to the link member 110. Further, a horseshoe-shaped retaining ring 71 is fitted into the small diameter portion 111e shown in FIG. The movement of the connecting pin 111 in the axial direction in which the connecting pin 111 extends is restricted by the retaining ring 71 and the head 111d.

  As shown in FIG. 12B, the link member 110 is provided with a notch portion 110f. Although not shown, the drive sprocket 14 of this embodiment is a sprocket with a pin. A pin provided on the sprocket with a pin engages with the notch portion 110f, whereby the rotational driving force of the sprocket with the pin is transmitted to the link member 110, and the endless chain 11 travels on the circular track.

  As shown in FIG. 12A, each of the pair of link plates 112 is provided with a protruding portion 110 a having a substantially trapezoidal shape in a plan view protruding toward the outside of the link plate 112. The protrusion 110a is formed integrally with the link plate 112. The protruding portions 110a of all the link members 110 included in the endless chain 11 protrude from the link member 110 to a position overlapping the guide member 9 when viewed from above when the guide member 9 is disposed. The pond width direction restricting portion 92 of the guide member 9 is disposed at a distance S1 from the endless chain 11 in the pond width direction. This interval S1 is designed to be a narrow interval in a range in which the protruding end surface of the protruding portion 110a does not contact the pond width direction regulating portion 92 when the endless chain 11 is traveling normally. That is, the pond width direction restricting portion 92 in the present embodiment is a protrusion 110a of the link member 110 when the endless chain 11 moves in the pond width direction beyond the range in which the endless chain 11 normally travels due to shaking or sloshing due to an earthquake. It is arranged so that the protruding end surface of the abuts.

  As shown in FIG. 12 (b), the protrusions 110 a provided on both sides of the pond width direction of the link member 110 are arranged at an interval S <b> 2 in the vertical direction with respect to the upper restriction portion 91 of the guide member 9. ing. This interval S2 is designed to be a narrow interval within a range in which the upper surface of the protruding portion 110a does not contact the upper direction restricting portion 91 when the endless chain 11 is traveling normally. That is, the upper direction restricting portion 91 in this embodiment is an upper surface of the protruding portion 110a of the link member 110 when the endless chain 11 moves upward beyond the range where the endless chain 11 is normally running due to shaking or sloshing due to an earthquake. Are arranged so as to contact each other.

  FIG. 12B also shows the link member 110 provided with the stay 1101. The link member 110 provided with the stay 1101 is arranged every 20 link members 110 connected in the circumferential direction of the endless chain 11. The flight plate 12 is attached to the stay 1101 via an attachment member 1102.

  Similar to the previous embodiment, also in this embodiment, the link member 110 located on the water surface track portion 11a when the endless chain 11 moves beyond the range in which it normally travels due to shaking or sloshing due to an earthquake. A protrusion 110 a provided on the guide member 9 abuts on the guide member 9. Thereby, it is possible to prevent the water surface track portion 11a from shaking greatly, and the winding portion of the endless chain 11 can be prevented from being detached from the drive sprocket 14 or the intermediate sprocket 15.

  As described above, according to the sludge scraping device 10 described above, the endless chain 11 can be prevented from being detached from the drive sprocket 14 and the intermediate sprocket 15 even if an earthquake or sloshing due to the earthquake occurs.

  In addition, even if it is a structural requirement contained only in each description of each embodiment and modification which were demonstrated above, you may apply the structural requirement to another embodiment and modification.

DESCRIPTION OF SYMBOLS 1 Sedimentation basin 1d Bottom of pond 9 Guide member 10 Sludge scraping device 11 Endless chain 12 Flight board 14, 15, 16, 17 Sprocket 110a, 111a Protrusion part T1 Scouring track T2 Passing track T3 Upstream track T4 Water surface track W Water surface

Claims (3)

In the sludge scraping device that is provided in a sedimentation basin where the sludge contained in the received water settles at the bottom of the pond, and the sludge settled on the bottom of the pond is scraped by a flight plate extending in the pond width direction,
A plurality of the flight plates are attached at intervals, and an endless chain that travels on a circular track in which a scraping track extending along the pond bottom and a water surface track extending on the water surface side is connected;
Two rotating wheels that are disposed at both ends of the water surface track, each of which is wound around a part of the endless chain and rotates around a central axis;
A guide member disposed along the water surface in the vicinity of a portion of the endless chain located in the water surface track,
The endless chain is a plurality of protrusions protruding in the pond width direction and spaced apart along the orbit.
The guide member is vertically spaced above the protrusion provided on a portion of the endless chain located on the water surface track between the central axes of the two rotating wheels. The sludge scraping device, wherein the sludge scraping device is disposed so as to overlap the protruding portion and has a length equal to or longer than the interval between the adjacent protruding portions. In the sludge scraping device that is provided in a sedimentation basin where the sludge contained in the received water settles at the bottom of the pond, and the sludge settled on the bottom of the pond is scraped by a flight plate extending in the pond width direction,
A plurality of the flight plates are attached at intervals, and an endless chain that travels on a circular track in which a scraping track extending along the pond bottom and a water surface track extending on the water surface side is connected;
Two rotating wheels that are disposed at both ends of the water surface track, each of which is wound around a part of the endless chain and rotates around a central axis;
A guide member provided along the water surface and disposed in the vicinity of the portion of the endless chain located in the water surface track, and facing the portion with a gap in the pond width direction. A sludge collecting device characterized by having The endless chain is a plurality of protrusions protruding in the pond width direction and spaced apart along the orbit.
3. The guide member according to claim 2, wherein a length of a portion arranged between the central axes of the two rotating wheels has a length equal to or longer than an interval between the adjacent projecting portions. Sludge collecting device.