JP6678921B2 - Sludge scraping device - Google Patents

Description

  The present invention relates to a sludge scraping device which is provided in a settling tank in which sludge contained in received water is settled at the bottom of a pond, and scrapes the sludge settling at the bottom of the pond by a flight plate extending in the pond width direction.

  As a sludge scraping device, there is known a device in which a flight plate is attached to an endless chain partially wound around a rotating wheel such as a drive wheel and a driven wheel, and the flight plate is circularly moved by running the endless chain in a forward direction. . The endless chain of this sludge scraping device travels on a circular track in which a scraping track extending along the bottom of the sedimentation basin and a water track extending to the water surface side are connected. The rotating wheels are arranged at both ends of each track. The flight board scrapes sludge that has settled on the bottom of the sedimentation tank when traveling on the bottom of the pond, and scum floating on the water surface when traveling on the water surface side. On the water surface of the sedimentation basin, structures such as troughs and drainage gutters are installed to let the scum drawn by the flight plates flow outside the sedimentation basin. Since it is necessary to avoid this structure and install an endless chain, the distance that the water surface track extends is generally shorter than the distance that the scraping track extends. For this reason, the winding angle of the winding portion of the endless chain wound around the rotary wheel becomes small in at least one of the two rotary wheels arranged at both ends of the water surface track.

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

  Patent Document 1 discloses a pin guide member in which an endless chain is provided with a connecting pin whose one end projects in the pond width direction, and the projecting parts of the connecting pin are arranged at intervals in the radial direction. The pin guide member is provided on the winding portion of the endless chain that is wound around the rotary wheel. According to Patent Document 1, by arranging the pin guide member such that the connecting pin at the winding part comes into contact with the pin guide member when the winding part of the endless chain is likely to come off the rotating wheel due to shaking due to an earthquake. , It is intended to prevent the endless chain from slipping off.

  Further, Patent Document 2 discloses a flight plate guide member. This flight plate guide member is arranged at an interval in the upward direction with respect to the upper end surface of the flight plate attached to the portion of the endless chain located on the water surface track (hereinafter referred to as the water surface track portion). And a portion disposed at an interval in the pond width direction with respect to the end surface of the flight plate on the pond width direction side. Patent Document 2 arranges the 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 orbit portion is likely to shift upward or in the pond width direction due to shaking due to an earthquake. By doing so, it is intended to suppress the deviation of the flight plate in the upward direction and the deviation in the pond width direction.

JP, 2011-78903, A JP, 2006-326483, A

  However, the fact that the endless chain derails from the rotating wheel is not due to the direct effect of shaking due to an earthquake, but rather due to the effect of sloshing, in which the water near the water surface in the sedimentation basin is greatly wavy due to the earthquake. It became clear by the research of the person. When sloshing occurs, the water surface track part sways greatly, and the swaying force is transmitted to the winding part of the endless chain, which may cause the endless chain to slip off the rotating wheel. As described above, Patent Document 1 has a configuration in which the pin guide member is provided on the winding portion of the endless chain that is wound around the rotary wheel. With this configuration, it is not possible to prevent the water surface track portion from swaying. Moreover, since at least one of the two rotary wheels arranged at both ends of the water surface track has a small winding portion, the range in which the pin guide member can guide the endless chain is also reduced. In other words, in the configuration of Patent Document 1, since there is a small guide range of the winding portion where the force of the water surface track portion that largely shakes due to sloshing is directly transmitted, it may not be possible to prevent derailment of the endless chain. Further, when the endless chain is reversely run in the direction opposite to the forward running direction, the track of the endless chain during reverse running changes from the track during forward running. When the vehicle may be run in reverse, the pin guide member needs to be installed in a range where the pin guide member and the endless chain do not contact, taking into consideration the orbit during reverse running. The range that can be guided becomes extremely small, and even if there is this pin guide member, there is a risk that the endless chain will disengage from the rotating wheel due to sloshing.

  In the configuration of Patent Document 2, since the flight plate guide member is provided along the water surface track, the flight plate attached to the water surface track portion is suppressed to some extent from being displaced upward or in the pond width direction due to sloshing. can do. However, the flight plate guide member cannot suppress the rotation of the flight plate whose rotation axis direction is the pond width direction or the rotation of the flight plate whose rotation axis direction is the vertical direction, and thus the movement of the water surface orbit portion. Almost no suppression effect is obtained. For example, since it is not possible to prevent the lower end portion of the flight plate from moving upward and the flight plate from tilting, 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 swaying greatly due to sloshing, and a strong force due to the swaying is transmitted to the winding portion of the endless chain, which may cause the endless chain to come off from the rotating wheel. is there.

  In view of the above circumstances, it is an object of the present invention to provide a sludge scraping device capable of preventing the flight plate or the endless chain from colliding with the structure.

The sludge scraping apparatus of the present invention which solves the above object,
It has a structure where the lower end is below the water surface and is provided with a swallowing mouth for swallowing water near the water surface.Sludge contained in the received water is provided in the sedimentation pond where the sludge settles at the bottom of the pond. In the sludge scraping device that scrapes the sludge settled at the bottom by the flight plate extending in the pond width direction,
A plurality of the flight plates are attached at intervals, a water surface track extending on the water surface side, a scraping track along the pond bottom, and one end of the water surface track connecting the scraping track and passing near the structure. An endless chain that runs on a circular orbit including a passing orbit,
A rail member that extends between the water surface track side and the scraping track side along the passage track between the passage track and the structure, and that contacts the flight plate and applies a predetermined tension to the endless chain. and,
Two sprockets which are arranged at both ends of the water surface orbit and which are respectively wound around a part of the endless chain and rotate about a central axis as a rotation center,
A return rail that is arranged along the pond bottom between the rail member and the pond bottom, and guides the flight plate on the downstream side in the passage track.
A support shaft that swingably supports the rail member,
A regulation guide that is provided in the vicinity of the sprocket on the one end side of the two sprockets, and that regulates the swing range of the rail member ,
The rail member, the end of the water track side, said one of the endless chain state, and are not positioned below the upper end of the flight plate attached to parts running the water surface track,
The regulation guide regulates a movement range of the rail member in a direction in which the rail member approaches the structure even when the rail member is pushed back by the flight plate, and a direction in which the rail member approaches the return rail. also characterized in der Rukoto restricts the movement range of the rail member.

  According to the sludge scraping device of the present invention, it is possible to prevent the flight plate or the endless chain from colliding with the structure.

It is a side sectional view of a settling basin in which the sludge scraping device which is one embodiment of the present 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 a schematic diagram showing a situation where an endless chain was made to run in reverse. It is the elements on larger scale which expanded the B section of FIG. FIG. 6 is a plan view of a part of the endless chain and a part of a guide member shown in FIG. 5, viewed from above. 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 part from above, (b) sees the endless chain and guide member shown in (a) from a side. It is a figure.

  Hereinafter, embodiments of the present invention will be described 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.

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

  As shown in FIG. 1, the settling basin 1 is provided with a sludge scraping device 10 of the present embodiment, a scum removing device 30, a drain gutter 40, and a sludge pit 50. The drain gutter 40 is provided in the downstream side portion of the sedimentation tank 1, and the sludge pit 50 is provided in the upstream side portion of the sedimentation tank 1.

  The sludge scraping device 10 according to the present embodiment is provided at each end of the sedimentation tank 1 in the pond width direction, and is stretched between the pair of endless chains 11 running in the sedimentation tank 1 and the pair of endless chains 11. And a protection mechanism 13 for preventing the flight plate 12 from coming into contact with a trough 32 described later. Each of the endless chains 11 has a scraping orbit T1 extending along the pond bottom 1d, a passing orbit T2 extending from the scraping orbit T1 toward the water surface W on the downstream side of the sedimentation basin 1, and an upstream side of the sedimentation basin 1. It is an annular chain that forms a circular orbit in which an upstream side 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 on the water surface W side are connected. The water surface trajectory T4 is a trajectory that extends 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 the portion of each endless chain 11 located on the water surface trajectory T4 (may be referred to as water surface trajectory portion 11a in the following description). A member 9 is provided. The guide member 9 will be described in detail later. The passing track T2 is a track below the trough 32 and passing near the trough 32. In addition, in FIG. 1, the endless chain 11 is shown by the above-mentioned orbit.

  Sprockets 14 to 17 connecting the tracks T1 to T4 are arranged at both ends of the tracks T1 to T4. These sprockets 14 to 17 are arranged inside the orbit. A part of the endless chain 11 is wound around each sprocket 14 to 17, and the winding portion of the endless chain 11 wound around each sprocket 14 to 17 meshes with the sprocket 14 to 17. .

  The sprocket 14 is arranged at the connecting portion of the upstream side track T3 and the water surface track T4. In the following description, this sprocket 14 may be referred to as the drive sprocket 14. A drive shaft 141 is fixed to the central 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. That is, the drive sprocket 14 is a drive wheel to which the drive force of the motor 21 is transmitted to drive the endless chain 11. The motor 21 is a motor that can rotate in both clockwise and counterclockwise directions in FIG. The motor 21 is normally driven to rotate clockwise in FIG. As the motor 21 rotates clockwise, the drive sprocket 14 and the endless chain 11 also normally run clockwise. Hereinafter, running the endless chain 11 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 foreign matter 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 biting of the foreign matter, the motor 21 reverses (rotates counterclockwise in FIG. 1) for a short time. With the reverse rotation of the motor 21, the endless chain runs counterclockwise in FIG. 1 (so-called reverse movement). Hereinafter, running the endless chain 11 counterclockwise in FIG. 1 is referred to as reverse running.

  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 axes. Each of the driven wheels sprockets 15 to 17 is rotatable with respect to its fixed shafts 151, 161, and 171. The sprockets 14 to 17 rotate about the drive shaft 141 and the fixed shafts 151, 161, and 171 as rotation shafts. In the following description, the sprocket 15 arranged at the connecting portion of 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 the rotating wheel according to the present invention.

  The flight plates 12 are attached at equal or substantially even intervals in the circumferential direction over the entire circumference of the orbit of the endless chain 11. A bottom rail 23 extending in the longitudinal direction of the settling tank 1 along the bottom 1d is fixed to the bottom 1d of the settling tank 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. Further, a downstream side return rail 25 that is substantially parallel to the bottom 1d and extends in the longitudinal direction of the settling tank 1 is fixed at a predetermined height position downstream of the settling tank 1 from the bottom 1d. 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 running in the normal direction, the flight plate 12 attached to the endless chain 11 runs while being guided by the downstream return rail 25 on the downstream side in the passing track T2. Further, in FIG. 1, most of the part is hidden by the guide member 9, but in the vicinity of the water surface W on the upstream side of the sedimentation basin 1, 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 on the water surface track T4 while being guided by the upstream return rail 24.

  When the endless chain 11 runs in the forward direction, the flight plate 12 travels along the pond bottom 1d along the scraping track T1 from the downstream side to the upstream side, and the sludge settled on the pond bottom part 1d moves to the upstream side by the flight plate 12. It is drawn to the sludge pit 50. Since it is necessary to scrape the sludge settled on the pond bottom part 1d to the sludge pit 50 provided upstream from the downstream end of the settling pond 1, the scraping track T1 extends almost the entire length in the longitudinal direction of the pond bottom part 1d. It is in the orbit. The sludge attracted to the sludge pit 50 is discharged to the outside of the sedimentation tank 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 having an open upper end in a side view, and the lower end is located below the water surface W. The trough 32 extends across the sedimentation basin 1 in the basin width direction to a scum pit (not shown) provided outside the sedimentation basin 1. The upstream side wall 321 of the trough 32 is provided with a swallowing port 322 for swallowing water near the water surface W of the settling basin 1. A predetermined water level higher than the lower end portion of this swallowing port 322 becomes the lowest water level of the settling basin 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 its lower end being the center of rotation. The weir 31 changes its state between a weired 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 shut state. The weir 31 prevents water in the settling basin 1 from flowing into the trough 32 from the swallowing port 322 in the blocked 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 rotates about the lower end and becomes a swallowed state.

  Scum floats on the water surface W of the settling basin 1. When the endless chain 11 runs in the forward direction, the flight plate 12 runs on the water surface track T4 from the upstream side to the downstream side, and the scum floating on the water surface W of the sedimentation tank 1 is transferred to the weir 31 by the flight plate 12. To be done. When the weir 31 is swallowed, the scum flows into the trough 32 together with the water in the sedimentation basin 1 over the upper end of the weir 31. Since the water surface track T4 needs to be arranged upstream of the trough 32 while avoiding structures such as the trough 32 and the drain gutter 40, the distance over which the water surface track T4 extends is larger than that of the scraping track T1. Shorter than the extended distance.

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

  The protection mechanism 13 includes a pair of protection rails 18, a support shaft 19 that swingably supports the protection rail 18, and a restriction shaft 20 that restricts the swing range of the protection rail 18. The protection rail 18 is a rail member that is arcuate in side view and extends in the intersecting direction that intersects with the pond width direction between the passing track T2 and the trough 32. The protection rail 18 prevents the flight plate 12 attached to the portion of the endless chain 11 running on the passing track T2 from coming into contact with the trough 32. A bearing 181 having a support shaft 19 passed through is fixed to each protection rail 18. Each protection rail 18 is swingably supported by the support shaft 19 with the support shaft 19 as the swing center shaft. Further, the regulation shaft 20 is passed through one end portion (the left end portion in FIG. 2) of each protection rail 18.

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

  As shown in FIG. 3, each protection rail 18 is arranged near the pair of side walls 1c of the settling basin 1 and closer to the center in the pond width direction than the end face of the flight plate 12 in the pond width direction. The protective rail 18 may be arranged at another position in the pond width direction as long as the protective rail 18 and the flight plate 12 overlap each other in plan view, for example, the endless chain 11 in 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 respective side walls 1c of the settling tank 1. A regulation guide 201 having a groove 201a recessed in the pond width direction is fixed to each sidewall 1c of the settling basin 1. Both end portions of the regulation shaft 20 are inserted into the respective groove portions 201a. As shown in FIG. 2, the groove portion 201a has a substantially fan shape in a side view. By restricting the movement range of the restriction shaft 20 by the groove 201a, the swing range of the protection rail 18 is restricted.

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

  In the initial state where the endless chain 11 is first installed in the settling basin 1, the endless chain 11 is wound around each sprocket 14 to 17 with an appropriate tension (for example, 100 kgf) being applied. The solid line in FIG. 2 shows the initial state. On the other hand, the endless chain 11 may change over time due to familiarity with the endless chain 11, creep phenomenon, or the like, and may be elongated. The chain double-dashed line in FIG. 2 indicates a state in which the endless chain 11 is extended.

  The protection rail 18 is in contact with any one or a plurality (here, two) of the flight plates 12 attached to the endless chain 11 from the outside of the orbit. In the initial state, the protective rail 18 is pushed toward the outside of the circulating track by the tension of the endless chain 11 and is in the retracted position retracted to the outside of the circulating track (the trough 32 side). However, the swing range of the protective rail 18 is regulated by the regulation guide 201 so that the protective rail 18 and the trough 32 do not come into contact with each other, and a gap is provided between the protective rail 18 and the trough 32 at the retracted position. ing. Further, since the protective rail 18 is interposed between the trough 32 and the flight plate 12, a predetermined space 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 coming into contact with each other.

  When the endless chain 11 travels, a traveling load is generated on the part of the endless chain 11 located on the scraping track T1 by the flight plate 12 scraping sludge. When the endless chain 11 is traveling in the normal direction, tension corresponding to the traveling load is generated in the portions of the endless chain 11 located on the scraping track T1 and the upstream track T3. On the other hand, in the portions of the endless chain 11 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 due to the extension of the endless chain 11.

  In the extended state of the endless chain 11, the protective rail 18 follows the extension of the endless chain 11 and swings around the support shaft 19 as the swing center axis as shown by the two-dot chain line in FIG. It contacts the flight plate 12 from the outside of the circular orbit. Further, the contact portion of the protection rail 18 with the flight plate 12 advances toward the inner side of the orbit by the rotation moment generated in the protection rail 18 to push the flight plate 12 and apply tension to the endless chain 11. Granted. Further, the endless chain 11 is pressed to the side of the intermediate sprocket 15 by pushing the flight plate on the passing track T2 into the inside of the circulating track by the protective rail 18. As a result, it becomes difficult for the endless chain 11 to separate from the intermediate sprocket 15, and even if an earthquake or sloshing due to an earthquake occurs, the endless chain 11 is prevented from slipping off the intermediate sprocket 15 to some extent.

  FIG. 4 is a schematic diagram showing a state in which the endless chain is running in reverse.

  As shown in FIG. 4, the reverse rotation of the motor 21 causes the portions of the endless chain 11 located on the passing track T2 and the water surface track T4 to be pulled by the drive sprocket 14 to be in a tension state without slack. In this tensioned state, the tension of the portion of the endless chain 11 located on the passing track T2 exceeds the tension applied to the endless chain 11 by the protective rail 18 during forward rotation. For this reason, the protection rail 18 is pushed back by the flight plate 12 attached to the portion of the endless chain 11 located on the passing track T2, and is retracted to the outer limit of the swing range outside the orbiting track. Since the swing range of the protection rail 18 is regulated by the regulation guide 201 to a range where it does not come into contact with the trough 32, collision between the protection rail 18 and the trough 32 is prevented. In addition, since the flight plate 12 also maintains a predetermined distance from the trough 32 by the protective rail 18, the flight plate 12 and the trough 32 do not collide with each other even when the vehicle travels in the reverse direction. In the tensioned state, the slack of the endless chain 11 occurs in the upstream side track T3.

  When the portions of the endless chain 11 located on the passing track T2 and the water surface track T4 are in a tensioned state, the downstream side portion of the winding part of the endless chain 11 wound around the intermediate sprocket 15 at the time of forward rotation. It separates from the intermediate sprocket 15 and moves upward as compared to when traveling in the normal direction. When a guide member for preventing wheel slippage is provided on the above-mentioned winding portion, it is necessary to provide the guide member in a range where the downstream side portion does not come into contact during reverse rotation traveling in consideration of the upward movement.

  FIG. 5 is a partially enlarged view of the portion B of FIG. 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 members 110 are connected by the connecting pins 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 on the intermediate sprocket 15 is smaller than the winding angle shown in FIG. It is preferable that the winding angle of the endless chain 11 wound around the sprockets 14 to 17 is large in order to prevent tooth jumping and wheel slippage. The winding angle of the intermediate sprocket 15 is small because, as described above, the distance that the water surface track T4 extends is shorter than the distance that the scraping track T1 extends. Further, sloshing is a phenomenon in which the liquid surface changes most near the water surface W. For this reason, the endless chain 11 is easily located at the end of the water surface track T4 and is easily detached at the winding portion wound around the intermediate sprocket 15 having 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 plate member that extends in the pond width direction and has a U-shaped cross section. As described above, the endless chains 11 are arranged at both ends in 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 ends of the flight plate 12 in the pond width direction are attached to stays 1101 provided on the link members 110 of the endless chains 11 arranged at both ends of the pond width direction, respectively, via attachment members 1102. Therefore, the number of all the connecting pins 111 included in the endless chain 11 is larger than the number of all the flight plates 12 attached to the endless chain 11. In the present embodiment, the space in the orbit to which the flight plate 12 is attached is about 3 m, and the space between the connecting pins 111 in the orbit is about 15 cm. The orbit formed by the endless chain 11 corresponds to the locus connecting the adjacent connecting pins 111 of the endless chain 11 shown in FIG.

  Guide members 9 are provided on both sides of the water surface track portion 11a of the endless chain 11 in the pond width direction 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 just 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 axial 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 the pair of side walls 1c, respectively.

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

  As shown in FIG. 6, the link member 110 that constitutes the endless chain 11 is a barrel in which a pair of link plates 112 facing each other in the pond width direction (left and right direction in FIG. 6) have through holes extending in the pond width direction. It 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 connecting pins 111, and the link members 110 are connected by inserting the connecting pins 111 into the through holes of the link members 110. It will be done. The connecting pin 111 is inserted into the through holes of the adjacent two link members in a state where the through holes of the two adjacent link members are aligned with each other, and a nut 115 for preventing the connecting pin 111 from coming off is provided outside the pair of link plates 112. 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 regulating member for regulating the position of the connecting pin 111 in the extending direction. The connecting pin 111 has a protruding portion 111 a that further protrudes from the nut 115 to the outside, which is 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 protruding portion 111a is equal to or smaller than the diameter of the through hole of the link member 110. Instead 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 retaining pin having a diameter longer than the diameter of the through hole is arranged on the other end side. It may be in a different form. This also restricts the position of the connecting pin 111 in the extending direction. The retaining pin also functions as a rotation preventing pin that restricts the connecting pin 111 from rotating with respect to the link plate 112. In this aspect, the connecting pin 111 has a protruding portion that protrudes further outward from the head portion, and also has a protruding portion that protrudes further outward from the retaining pin.

  The teeth of each sprocket 14 to 17 are inserted between the pair of link plates 112. In the drive sprocket 14 that rotates together with the drive shaft 141, the rotational driving force of the drive sprocket 14 is transmitted to the link member 110 by engaging the downstream edge of the tooth in the rotational direction of the tooth with the barrel portion 113, and the endless chain 11 makes a circular orbit. To 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 members 9 are arranged on both sides of the water surface track portion 11a in the pond width direction. The guide member 9 is an L-shaped plate member whose vertical cross section (the direction orthogonal to the paper surface in FIG. 6) is upside down. In the following description, a portion of the guide member 9 having the vertical direction as the thickness direction is referred to as an upward direction regulating portion 91, and a portion having the pond width direction as the thickness direction is referred to as a pond width direction regulating portion 92. In FIG. 6, the surface of the upward regulation portion 91 is shown.

  The projecting portions 111a of all the connecting pins 111 included in the endless chain 11 shown in FIG. 6 project from the link member 110 to a position overlapping the guide member 9 when viewed from above at the position where the guide member 9 is arranged. There is. The projecting portions 111a provided at both ends of the connecting pin 111 are arranged at intervals in the radial direction of the upward regulating portion 91 and the projecting portion 111a, which will be described later.

  Further, the pond width direction restricting portion 92 of the guide member 9 shown in FIG. 6 is arranged with a space S1 in the pond width direction from the protrusions 111a provided at both ends of the connecting pin 111 on the water surface track portion 11a. Has been done. The spacing S1 is designed to be a narrow spacing within a range in which the end surface 111b of the connecting pin 111 does not come into contact with the pond width direction restricting portion 92 when the endless chain 11 normally travels. That is, in the pond width direction restricting portion 92 in the present embodiment, when the endless chain 11 swings 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, the end surface 111b of the connecting pin 111 is changed. It is arranged so as to abut. In this embodiment, the protruding portions 111a are provided on all the connecting pins 111. The protrusions 111a on the water surface track portion 11a and the guide member 9 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 track portion 11a does not sway significantly. As a result, it is possible to prevent a strong force due to the shaking of the water surface track portion 11a from being transmitted to the winding portion of the endless chain 11 so that the winding portion of the endless chain 11 may slip off the drive sprocket 14 or the intermediate sprocket 15.

  FIG. 7 is a sectional view taken along line CC of FIG. Therefore, in FIG. 7, the back side of the drawing is the downstream side of the sedimentation basin, and the left-right direction of the drawing is the pond width direction. The intermediate sprocket 15 and the intermediate shaft 151 are not shown in FIG. 7.

  On the side wall 1c of the settling basin 1, an upstream pedestal 241 is provided at a position avoiding the orbit of the endless chain 11 and the flight plate 12. The guide members 9 arranged 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 which is turned upside down. Further, as shown in FIG. 7, the upward restriction portion 91 of the guide member 9 is arranged above the protrusions 111a provided at both ends of the connecting pin 111 on the water surface track portion 11a with a space S2 therebetween. Has been done. In the present embodiment, the space S2 is set to be a narrow space within a range in which the peripheral surface of the projecting portion 111a of the connecting pin 111 does not contact the upward regulating portion 91 when the endless chain 11 is traveling normally. Is designed to. That is, in the upward regulating portion 91 in the present embodiment, when the endless chain 11 swings in the up-and-down direction beyond the range in which the endless chain 11 normally travels due to shaking due to an earthquake or sloshing, the peripheral surface of the protruding portion 111a abuts. It is arranged as follows. The protrusions 111a and the guide members 9 on the water surface track portion 11a suppress the vertical movement of the water surface track portion 11a. Therefore, even if sloshing occurs due to an earthquake, the water surface track portion 11a does not sway significantly. As a result, it is possible to prevent a strong force due to the shaking of the water surface track portion 11a from being transmitted to the winding portion of the endless chain 11 so that the winding portion of the endless chain 11 may slip off the drive sprocket 14 or the intermediate sprocket 15.

  It should be noted that it is not necessary to provide the protruding portions 111a on all the connecting pins 111, and for example, the connecting pins 111 having the protruding portions 111a and the connecting pins 111 without the protruding portions 111a may be alternately arranged. However, the narrower the space in which the connecting pins 111 having the protrusions 111a are arranged is, the smaller the swaying motion of the water surface track portion 11a can be made. Therefore, the space between the protrusions 111a is narrower than the space in which the flight plate 12 is provided. It is preferable to arrange the connecting pin 111 having

  FIG. 7 also shows that the pond width direction restricting portion 92 of the guide member 9 is arranged with the endless chain 11 with a space S1 in the pond width direction. Due to shaking or sloshing due to an earthquake, the water surface track portion 11a may behave unexpectedly, for example, the connecting pin 111 is lifted while being inclined. By providing the pond width direction restricting portion 92, it is possible to suppress the swaying movement of the water surface track portion 11a in the pond width direction and reliably prevent the endless chain 11 from slipping off the sprockets 14 and 15. . In particular, the pond width direction restricting section 92 is effective when the space S2 is set to be long or when the upward restricting section 91 is omitted.

  The guide member 9 described above is arranged at a position deviated from the water surface track portion 11a, and is separated from the projecting portion 111a of the connecting pin 111 both in the extending direction of the connecting pin 111 and in the radial direction. That is, the upward regulating portion 91 faces the peripheral surface of the protruding portion 111a of the connecting pin 111 with a space from the upper side, and the pond width regulating portion 92 is arranged on the end surface 111b of the connecting pin 111 in the pond width direction. They are facing each other at a distance from.

  Further, as described above, the connecting pin 111 is fixed to the link member 110 by the nut 115. The protruding length L of the connecting pin 111 from the nut 115 to the protruding tip is preferably 5 mm or more and 30 mm or less. If this protrusion length L is less than 5 mm, the length of the end of the connecting pin 111 in contact with the upward regulating portion 91 is too short, and it is difficult to suppress the upward swinging motion of the water surface track portion 11a. become. On the other hand, if the protrusion length L exceeds 30 mm, dust or the like may be caught on the protrusion 111a of the connecting pin 111, which may hinder the drawing of sludge. Further, the pond width direction restricting portion 92 of the guide member 9 is arranged with a gap S1 in the pond width direction from the endless chain 11, and the length of the gap S1 is set to be the length of the protrusion length L or less. It is preferable. By doing so, when the water surface track portion 11a shakes 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 restricting portion 92 from the pond width direction.

  In the above description, when the water surface track portion 11a moves in the pond width direction beyond the range in which it normally travels due to shaking or sloshing due to an earthquake, the end surface 111b of the connecting pin 111 comes into contact with the pond width direction restricting portion 92. Was provided with a space S1. Instead of the end surface 111b of the connecting pin 111, the space S3 may be set so that the link plate 112 contacts the guide member 9. That is, as shown in FIG. 7, the upward regulation portion 91 of the guide member 9 is bent 90 degrees from the pond width direction regulation portion 92, and the front end faces the link plate 112. An interval S3 in the pond width direction between the link plate 112 and the tip of the upward regulation part 91 is set to be smaller than an interval S1 in the pond width direction between the end surface 111b of the connecting pin 111 and the pond width direction regulation part 92, and the earthquake occurs. The link plate 112 may be brought into contact with the tip of the upward regulation portion 91 when the water surface track portion 11a moves in the pond width direction due to swaying or sloshing. Alternatively, the spacing S3 and the spacing S1 may be the same length.

  The flight plate 12 is projected to the outside of the orbit 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 plate 12 passing through the scraping track T1 travels along the bottom of the pond by the tip shoe 121 slidingly contacting the bottom rail 23 (see FIG. 1). In addition, the flight plate 12 passing through the downstream portion of the passageway T2 travels along the downstream return rail 25 by the return shoe 122 slidingly contacting the downstream return rail 25 (see FIG. 1). Go. Further, the flight plate 12 passing through the water surface track T4 slides in contact with the upstream return rail 24 attached to the upstream pedestal 241 to travel along the upstream return rail 24. 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 right above the axis of the drive shaft 141 and the position right above the axis of the intermediate shaft 151. However, in FIG. The guide member 9 may be extended to the winding portions of the drive sprocket 14 and the intermediate sprocket 15 shown.

  Next, a modified example of this embodiment will be described. In the following description, constituent elements having the same names as the constituent elements described above are designated by the same reference numerals as those used so far. Moreover, the description overlapping with the description of the sludge scraping apparatus described above may be omitted.

  FIG. 8: is a figure which shows the 1st modification of this embodiment.

  In the first modification, the guide member 9 is arranged 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 111 a protruding from the nut 115 only on the side on which 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 rotatable roller 116 with respect to the connecting pin 111, the frictional resistance when the connecting pin 111 abuts against the upward regulating portion 91 is reduced.

  Further, in the upward regulating portion 91 in this modified example, after being bent 90 degrees from the pond width direction regulating portion 92, the tip portion 91a 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 in a state of being spaced in the pond width direction. By doing so, even if the guide member is provided only on one side, the movement of the water surface track portion 11a on either side in the pond width direction can be suppressed. The vertical gap between the outer periphery of the roller 116 and the upward regulation part 91 facing the outer periphery of the roller 116 is narrower than the vertical gap between the bent tip portion 91a of the upward regulation part 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 regulating portion 91.

  FIG. 9 is a diagram showing a second modification of this 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 includes an inclined portion 93 that is inclined upward from the upper end of the pond width direction restricting portion 92 toward the side wall 1c, and extends from the upper end of the inclined portion 93 toward the side wall 1c. And a horizontal portion 94 that extends 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 travels while being guided by the horizontal portion 94 by the return shoe 122 provided on the flight plate 12 slidingly contacting the horizontal portion 94.

  Incidentally. In this modified example, the upward regulating portion 91 is omitted, and thus the protruding portion 111a does not necessarily have to be provided. That is, the nut 115 or the link plate 112 may contact the pond width direction restricting portion 92 when the water surface track portion 11a moves in the pond width direction. 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 restricting portion 92.

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

  FIG. 10: is a figure which shows the 3rd modification of this embodiment.

  In the third modification, the guide member 9 is divided, and the guide member 9 is omitted in the central portion in the extending direction of the water surface track portion 11a. One of the divided guide members 9 extends from directly above the axis of the drive shaft 141 to both sides of the water surface track portion 11a in the pond width direction in the direction of the intermediate sprocket 15 substantially along the water surface W. Further, the other divided guide member 9 extends from directly above the axis of the intermediate shaft 151 to both sides of the water surface track portion 11a in the pond width direction in the direction of the drive sprocket 14 substantially along the water surface W. The length of each guide member 9 in the extending direction is about 5 times the length at which the connecting pins 111 are provided. According to the sludge scraping apparatus 10 of this modified example, even if the central portion in the extending direction of the water surface track portion 11a sways due to the occurrence of sloshing due to an earthquake, the swaying movement is suppressed at the portion where the guide member 9 is present and is small. Become. As a result, the swaying force transmitted to the portion of the endless chain 11 wound around the drive sprocket 14 or the intermediate sprocket 15 is weakened, and the endless chain 11 can be prevented from slipping off the drive sprocket 14 and the intermediate sprocket 15. .

  The length of each guide member 9 in the extending direction may be longer than the distance between the connecting pins 111 provided with the protruding portions 111a adjacent to each other along the circular orbit. This is because when the water surface track portion 11a moves due to shaking or sloshing due to an earthquake, the protruding portion 111a is brought into contact with the guide member 9 regardless of the position of the connecting pin 111 provided with the protruding portion 111a. . However, the longer the length of each guide member 9 in the extending direction, the more the swaying movement of the water surface track portion 11a can be suppressed. Therefore, the length of the guide member 9 in the extending direction is preferably 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 in the vicinity of the center where the water surface track portion 11a extends. By providing the guide member 9 near the center of the water surface orbit portion 11a, the amplitude of the water surface orbit portion 11a caused by shaking or sloshing due to an earthquake can be divided near the center to reduce the amplitude.

  FIG. 11: is a figure which shows the 4th modification of this 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 of the guide member in the extending direction is located closer to the intermediate shaft 151 by a distance D1 than the axis of the drive shaft 141. Further, the other end surface 9b of the guide member in the extending direction is located on the drive shaft side by a distance D2 from the axial center of the intermediate shaft 151. When sloshing due to an earthquake occurs, the endless chain 11 between each end surface 9a, 9b of the guide member 9 and the winding portion sways with an amplitude according to the distance D1, D2. When the distances D1 and D2 are long, the swing motion of the endless chain 11 between the end surfaces 9a and 9b of the guide member 9 and the winding portion becomes large, and the endless chain 11 drives the drive sprocket 14 and the intermediate sprocket 15 There is a risk that the bicycle will be derailed. That is, the shorter the distances D1 and D2 are, the smaller the swaying motion of the endless chain 11 between the end surfaces 9a and 9b of the guide member 9 and the winding portion can be reduced. It is preferable that the distance is shorter than the distance at which the plates 12 are provided. Further, it is more preferable that the distances D1 and D2 are 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. Also in the following description, components having the same names as those of the components described so far are designated by the same reference numerals as those used so far. Further, the description overlapping with the description of the sludge scraping apparatus of the above embodiment may be omitted.

  12A and 12B are views showing another embodiment, in which FIG. 12A is a view of the endless chain and the guide member in the track portion of the water surface as seen from above, and FIG. 12B is the endless chain and the guide member shown in FIG. It is the figure seen from the side. Note that, in FIG. 12A, the flight plate 12 and the attachment member 1102 of the flight plate 12 are not shown.

  In the previous embodiment, the connecting pin 111 was provided with the projecting portion 111a, but in the sludge scraping apparatus 10 of this other embodiment, the link member 110 of the endless chain 11 is provided with the projecting portion 110a. 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. 12 (a), 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. 12 (a)). 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 with two notches provided, and the notches engage with the detents 110 b provided on the link member 110. are doing. Due to this engagement, the connecting pin 111 cannot rotate with respect to the link member 110. A horseshoe-shaped retaining ring 71 is fitted in the small-diameter portion 111e shown in FIG. 12 (a). 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 portion 111d.

  As shown in FIG. 12B, the link member 110 is provided with a notch portion 110f. Although illustration is omitted, the drive sprocket 14 of the present embodiment is a sprocket with a pin. When the pin provided on the sprocket with a pin engages with the notch portion 110f, the rotational driving force of the sprocket with a pin is transmitted to the link member 110, and the endless chain 11 travels on a circular orbit.

  As shown in FIG. 12A, each of the pair of link plates 112 is provided with a projecting portion 110 a that projects toward the outside of the link plate 112 and has a substantially trapezoidal shape in a plan view. The protrusion 110a is formed integrally with the link plate 112. The projecting portions 110a of all the link members 110 included in the endless chain 11 project from the link members 110 to the positions where the guide members 9 are arranged and to overlap the guide members 9 when viewed from above. The pond width direction restricting portion 92 of the guide member 9 is arranged at a distance S1 from the endless chain 11 in the pond width direction. The spacing S1 is designed to be a narrow spacing within a range in which the projecting end surface of the projecting portion 110a does not contact the pond width direction restricting portion 92 when the endless chain 11 normally travels. That is, the pond width direction restricting portion 92 in the present embodiment, when the endless chain 11 moves in the pond width direction beyond the range in which the endless chain 11 normally runs due to shaking due to an earthquake or sloshing, the protruding portion 110a of the link member 110. Are arranged so that the projecting end faces of are in contact with each other.

  As shown in FIG. 12 (b), the protrusions 110 a provided on both sides of the link member 110 in the pond width direction are vertically spaced apart from the guide member 9 upward regulation portion 91 by an interval S <b> 2. ing. The spacing S2 is designed to be a narrow spacing within a range in which the upper surface of the protruding portion 110a does not contact the upward regulating portion 91 when the endless chain 11 is traveling normally. That is, the upward regulating portion 91 in this embodiment is configured such that when the endless chain 11 moves upward beyond the range in which the endless chain 11 normally travels due to shaking or sloshing due to an earthquake, the upper surface of the protruding portion 110a of the link member 110. Are abutted against each other.

  FIG. 12B also shows the link member 110 provided with the stay 1101. The link members 110 provided with the stays 1101 are 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, in this embodiment as well, when the endless chain 11 moves beyond the range in which it normally travels due to shaking or sloshing due to an earthquake, the link member 110 located in the water surface track portion 11a. The protrusion 110a provided on the guide member 9 contacts the guide member 9. As a result, the water surface track portion 11a is prevented from swaying greatly, and the winding portion of the endless chain 11 can be prevented from slipping off the drive sprocket 14 or the intermediate sprocket 15.

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

  In addition, even if the constituent requirements are included only in the description of each of the embodiments and the modified examples described above, the constituent requirements may be applied to the other embodiments and the modified examples.

The first sludge scraping apparatus described so far 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 settling at the bottom of the pond extends in the pond width direction. In the sludge scraping device that scrapes by a plate,
A plurality of the flight plates are mounted at intervals, and an endless chain that travels in a circulating orbit in which a scraping orbit extending along the pond bottom and a water surface orbit extending on the water surface side are connected,
Two rotating wheels which are arranged at both ends of the water surface track, and which are respectively wound around a part of the endless chain and rotate about a central axis as a rotation center,
A guide member arranged along the water surface in the vicinity of the portion of the endless chain located on the water surface track,
The endless chain is one in which a plurality of protruding portions protruding in the pond width direction are arranged at intervals along the circular orbit,
The guide member is arranged above the protruding portion provided in a portion of the endless chain located on the water surface track so as to be vertically spaced from the protruding portion and overlap the protruding portion. It is characterized in that it extends from directly above the axis of one of the two rotating wheels to just above the axis of the other rotating wheel.

  According to the first sludge scraping device, the protrusion provided on the portion of the endless chain located on the water surface track is restrained from moving upward by the guide member. By suppressing the upward movement of the projecting portion, even if sloshing due to an earthquake occurs, the upward movement of the above portion is suppressed, and it is possible to prevent the portion from swaying significantly in the vertical direction. As a result, a strong force due to the shaking of the above-mentioned portion is not transmitted to the winding portion of the rotary wheel arranged at both ends of the above-mentioned portion, and the endless chain is prevented from slipping off from the rotary wheel.

  In addition, a plurality of the protrusions may be arranged along the circular orbit at intervals smaller than the intervals at which the flight plates are attached.

The second sludge scraping device described so far is provided in a sedimentation basin in which the sludge contained in the received water settles in the bottom of the pond, and the sludge settling in the bottom of the pond extends in the width direction of the pond. In the sludge scraping device that scrapes by a plate,
A plurality of the flight plates are mounted at intervals, and an endless chain that travels in a circulating orbit in which a scraping orbit extending along the pond bottom and a water surface orbit extending on the water surface side are connected,
Two rotating wheels which are arranged at both ends of the water surface track, and which are respectively wound around a part of the endless chain and rotate about a central axis as a rotation center,
Along the water surface, in the vicinity of the portion of the endless chain located on the water surface orbit, the portion and a guide member arranged facing the portion with a gap in the pond width direction,
The endless chain is one in which a plurality of protruding portions protruding in the pond width direction are arranged at intervals along the circular orbit,
The guide member extends from directly above the axis of one of the two rotary wheels to directly above the axis of the other rotary wheel.

  According to the second sludge scraping apparatus, the guide member suppresses the movement of the portion of the endless chain located on the water surface track in the pond width direction. By suppressing the movement of the above portion in the pond width direction, even if sloshing due to an earthquake occurs, it is possible to prevent the portion from swinging greatly in the pond width direction. As a result, a strong force due to the shaking of the above-mentioned portion is not transmitted to the winding portion of the rotary wheel arranged at both ends of the above-mentioned portion, and the endless chain is prevented from slipping off from the rotary wheel.

In the second sludge scraping device, the endless chain has a plurality of projecting portions projecting in the pond width direction arranged at intervals along the loop track.
The guide member may have a length of a portion arranged between the central axes of the two rotating wheels that is equal to or greater than a distance between the adjacent protrusions.

  Also by doing so, it is possible to prevent the endless chain from slipping off from the rotating wheels arranged at both ends of the portion of the endless chain located on the water surface orbit due to the effect of sloshing due to an earthquake.

The third sludge scraping apparatus described so far is provided in a settling basin in which the sludge contained in the received water has a structure whose lower end is located below the water surface and which is settled at the bottom of the pond. In the sludge scraping device that scrapes the sludge settled at the bottom by the flight plate extending in the pond width direction,
A plurality of the flight plates are attached at intervals, a water surface track extending on the water surface side, a scraping track along the pond bottom, and one end of the water surface track connecting the scraping track and passing near the structure. An endless chain that travels in a forward rotation direction on a circular orbit including a passing track,
Two sprockets which are arranged at both ends of the water surface orbit and which are respectively wound around a part of the endless chain and rotate about a central axis as a rotation center,
A guide member arranged along the water surface in the vicinity of the portion of the endless chain located on the water surface track,
A rail member that extends between the water surface track side and the scraping track side along the passage track between the passage track and the structure, and that contacts the flight plate and applies a predetermined tension to the endless chain. When,
A return rail that is arranged along the pond bottom between the rail member and the pond bottom, and guides the flight plate on the downstream side in the passage track.
A support shaft that swingably supports the rail member,
A regulation guide that is provided in the vicinity of the sprocket on the one end side of the two sprockets, and that regulates the swing range of the rail member,
The regulation guide regulates a movement range of the rail member in a direction in which the rail member approaches the structure even when the rail member is pushed back by the flight plate, and a direction in which the rail member approaches the return rail. The moving range of the rail member is regulated,
In the endless chain, a plurality of protruding portions protruding in the pond width direction are arranged at intervals along the circular orbit, and can travel in a direction opposite to the normal rotation direction,
The guide member does not exist on the passage orbit side with respect to the central axis of the sprocket on the one end side, and is provided on a portion of the endless chain located on the water surface orbit between the central axes of the two sprockets. The protruding portion is arranged above the protruding portion so as to be vertically spaced from the protruding portion so as to overlap with the protruding portion, and has a length equal to or greater than the distance between the adjacent protruding portions. To do.

In addition, the structure is provided with a swallow for swallowing water near the water surface,
The rail member may have one end on the water surface track side located below an upper end of the flight plate attached to a portion of the endless chain that runs on the water surface track.
Further, the fourth sludge scraping device described so far has a structure in which the lower end portion is located below the water surface and is provided with a swallowing mouth for swallowing water near the water surface, and is included in the received water. A sludge scraping device provided in a settling tank where sludge is settled at the bottom of the pond, and a sludge scraping device for scraping the sludge settling at the bottom of the pond by a flight plate extending in the pond width direction,
A plurality of the flight plates are attached at intervals, a water surface track extending on the water surface side, a scraping track along the pond bottom, and one end of the water surface track connecting the scraping track and passing near the structure. An endless chain that runs on a circular orbit including a passing orbit,
A rail member that extends between the water surface track side and the scraping track side along the passage track between the passage track and the structure, and that contacts the flight plate and applies a predetermined tension to the endless chain. With and
The rail member is characterized in that an end portion on the water surface track side is located below an upper end of the flight plate attached to a portion of the endless chain that runs on the water surface track. To do.

1 Settling basin 1d Pond bottom 9 Guide member 10 Sludge scraping device 11 Endless chain 12 Flight plates 14, 15, 16, 17 Sprockets 110a, 111a Projection part T1 Scooping track T2 Passing track T3 Upstream track T4 Water surface track W Water surface

Claims (1)

It has a structure where the lower end is below the water surface and is provided with a swallowing mouth for swallowing water near the water surface.Sludge contained in the received water is provided in the sedimentation pond where the sludge settles at the bottom of the pond. In the sludge scraping device that scrapes the sludge settled at the bottom by the flight plate extending in the pond width direction,
A plurality of the flight plates are attached at intervals, a water surface track extending on the water surface side, a scraping track along the pond bottom, and one end of the water surface track connecting the scraping track and passing near the structure. An endless chain that runs on a circular orbit including a passing orbit,
A rail member that extends between the water surface track side and the scraping track side along the passage track between the passage track and the structure, and that contacts the flight plate and applies a predetermined tension to the endless chain. and,
Two sprockets which are arranged at both ends of the water surface orbit and which are respectively wound around a part of the endless chain and rotate about a central axis as a rotation center,
A return rail that is arranged along the pond bottom between the rail member and the pond bottom, and guides the flight plate on the downstream side in the passage track.
A support shaft that swingably supports the rail member,
A regulation guide that is provided in the vicinity of the sprocket on the one end side of the two sprockets, and that regulates the swing range of the rail member ,
The rail member, the end of the water track side, said one of the endless chain state, and are not positioned below the upper end of the flight plate attached to parts running the water surface track,
The regulation guide regulates a movement range of the rail member in a direction in which the rail member approaches the structure even when the rail member is pushed back by the flight plate, and a direction in which the rail member approaches the return rail. sludge scraped up device according to claim der Rukoto which movement range also regulating of the rail member.