JP7440117B2 - Sludge scraping device - Google Patents

Description

The present invention relates to a sludge scraping device installed in a settling tank in which sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows.

As a sludge scraping device, one equipped with an endless chain having a scraping member extending in a pond width direction perpendicular to a water flow direction in which water containing sludge flows is known. In this sludge scraping device, a part of the endless chain is wrapped around a drive wheel, and the endless chain receives driving force from the drive wheel and runs, scraping members on the bottom side and water surface side of the sedimentation tank. It is moving in circulation. A portion of the endless chain is wound around the settling basin, and a driven wheel that rotates to follow the running of the endless chain is also arranged. The scraping member scrapes up the sludge that has settled on the bottom of the sedimentation basin when it travels on the bottom of the sedimentation basin, and scrapes up the scum floating on the water surface when it travels on the water surface side. Further, the sedimentation basin is provided with a rail member that extends in the water flow direction and has a sliding contact portion on which the scraping member is placed and on which the scraping member slides when the endless chain runs.

By the way, in a settling tank equipped with a sludge scraping device, the endless chain may come off the rotating wheels such as the driving wheel or the driven wheel due to the influence of an earthquake. The reason why the endless chain comes off the rotating wheel is not so much the direct effect of the shaking caused by the earthquake, but rather the effect of sloshing, which is caused by the large waves of water in the sedimentation basin caused by the earthquake. When sloshing occurs, the endless chain swings significantly, and the force of the swing is transmitted to the part of the endless chain that is wrapped around the rotating ring, which may cause the endless chain to come off the rotating ring.

As a measure against earthquakes, it has been proposed to provide a regulating member in the raking member (see, for example, Patent Document 1). The regulating member described in Patent Document 1 comes into contact with a rail member when the endless chain swings, thereby regulating the swing of the endless chain. When the endless chain runs, this regulating member enters from one end of the rail member below the sliding contact portion of the rail member, leaves a gap with the rail member, and passes through the rail member as the endless chain runs.

Japanese Patent Application Publication No. 2011-5400

However, when the regulating member enters below the sliding contact portion of the rail member from one end side of the rail member, it may come into contact with the rail member from above. If the regulating member comes into contact with the rail member, the running of the endless chain will be disrupted.

In view of the above circumstances, an object of the present invention is to provide a sludge scraping device in which the regulating member is unlikely to come into contact with the rail member.

The sludge raking device of the present invention that solves the above object has the following features:
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a rail member extending in the water flow direction in which the water flows, and having a sliding contact portion on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The raking member is provided with a protrusion that protrudes outward in the width direction of the sedimentation tank, and has a regulating member that comes into contact with the rail member when the endless chain swings and regulates the swing of the endless chain. It is a thing,
The rail member has a raking member attached to a water surface track portion extending on the water surface side from the upstream side to the downstream side in the water flow direction of the endless chain, and the raking member slides on the rail member. It includes a second rail member having two sliding contact parts,
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The second rail member has a second space provided by retreating from the inside toward the outside in the pond width direction near the area through which the protrusion passes when the endless chain runs. ,
The sludge scraping device is characterized in that the protruding portion enters from above the second rail member to below the second sliding contact portion using the second space.

Also,
The rail member includes a first rail having a first sliding contact portion on which a scraping member attached to a slack portion of the endless chain that is curved downward and loosens is placed, and on which the scraping member slides. It further includes a member,
The regulating member of the scraping member attached to the slack portion comes into contact with the first rail member when the slack portion swings, and regulates the swing of the slack portion;
The first rail member has a first space provided by retreating from the inside toward the outside in the pond width direction near a region through which the protrusion passes when the endless chain runs. ,
The protruding portion may be configured to enter from above the first rail member to below the first sliding contact portion using the first space.

In addition,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a rail member extending in the water flow direction in which the water flows, and having a sliding contact portion on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The raking member is provided with a protrusion that protrudes outward in the width direction of the sedimentation tank, and has a regulating member that comes into contact with the rail member when the endless chain swings and regulates the swing of the endless chain. It is a thing,
The rail member has a space provided by retracting from the inside to the outside in the pond width direction near a region through which the protrusion passes when the endless chain runs,
The sludge scraping device may be characterized in that the protruding portion enters from above the rail member to below the sliding contact portion using the space.

According to the present invention, it is possible to provide a sludge scraping device in which the regulating member is unlikely to come into contact with the rail member.

BRIEF DESCRIPTION OF THE DRAWINGS It is a sectional side view of the settling tank in which the sludge scraping device which is one Embodiment of this invention was installed. FIG. 2 is a partially enlarged view of section A in FIG. 1; (a) is a cross-sectional view taken along line BB in FIG. 2, and (b) is a diagram showing the upstream return rail and regulating member when sloshing occurs due to an earthquake and the water surface track section swings in the pond width direction. , (c) is a diagram showing a state in which the protruding portion of the regulating member contacts the sliding contact portion of the upstream return rail from above. FIG. 2 is a diagram schematically showing the scum removal device shown in FIG. 1 viewed from below on the downstream side in the water flow direction in water of a settling tank. It is a figure which shows the modification of embodiment described so far. It is a figure when the return rail of 2nd Embodiment is seen from above. It is a figure when the return rail of 2nd Embodiment is seen from above. The protruding part of the regulating member approaches the upstream end of the downstream return rail of the second embodiment from diagonally above and enters below the sliding contact part of the downstream return rail in a step-by-step manner. FIG. It is a figure which shows the modification of 2nd Embodiment. It is a figure which shows the relationship between the downstream side return rail and the protrusion part of a regulation member in the sludge scraping device of 3rd Embodiment. It is a figure which shows the relationship between the downstream return rail 24 and the protrusion part 1233 of the regulation member 123 in the sludge scraping device of 4th Embodiment. It is a figure which shows the modification of a regulation member.

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

FIG. 1 is a side sectional view of a settling tank in which a sludge scraping device according to an embodiment of the present invention is installed.

The sedimentation tank 1 shown in FIG. 1 is a substantially rectangular pond in plan view, surrounded by an upstream wall 1a, a downstream wall 1b, and a pair of side walls 1c. This sedimentation tank 1 receives water containing sludge such as sewage or rainwater from one end in the longitudinal direction (the left side in FIG. 1), settles the sludge contained in the received water on the bottom 1d of the tank, and Drain water from the right side in Figure 1. Hereinafter, the left side in FIG. 1 will be referred to as the upstream side, the right side in FIG. 1 will be referred to as the downstream side, and the direction from the left side to the right side in FIG. 1 will be referred to as the water flow direction. Further, in FIG. 1, the direction perpendicular to the plane of the paper is referred to as the pond width direction. Note that FIG. 1 is a view of the sedimentation basin viewed in the width direction of the basin.

As shown in FIG. 1, this settling tank 1 is provided with a sludge scraping device 10 of this embodiment, a scum removal device 30, a drainage gutter 40, and a sludge pit 50. The drainage gutter 40 is provided in the downstream portion of the settling tank 1. Further, the sludge pit 50 is provided in the upstream portion of the settling tank 1.

The sludge scraping device 10 of this embodiment includes an endless chain 11. This endless chain 11 is provided at both ends of the settling basin 1 in the basin width direction. A pair of endless chains 11 provided at both ends in the pond width direction each have a raking track Tk extending along the bottom 1d of the pond, and a raking track Tk extending from the raking track Tk toward the water surface on the upstream side of the settling tank 1. An upstream track Tu that rises, a water surface track Tw that extends on the water surface side from the upstream side to the downstream side in the water flow direction but is shorter than the raking track Tk, and the water surface track Tw and the raking track Tk on the downstream side of the settling basin 1. It is a ring-shaped chain that runs on a circular track connected to the downstream track Tl.

Further, a plurality of raking members 12 extending in the pond width direction are stretched around the pair of endless chains 11. As the endless chain 11 runs on the orbit, the raking member 12 circulates between the pond bottom 1d side and the water surface WL side. In FIG. 1, the endless chain 11 is shown in orbit.

Sprockets 14 to 17 are arranged at both ends of each track (Tk, Tu, Tw, Tl). A portion of the endless chain 11 is wound around each of the sprockets 14 to 17, and the portion of the endless chain 11 that is wound around each of the sprockets 14 to 17 meshes with the sprockets 14 to 17.

The sprocket 14 is arranged on the upstream side of the water surface trajectory Tw. In the following description, this sprocket 14 will be referred to as a drive sprocket 14. A drive shaft 141 is fixed to the center of the drive sprocket 14. The drive shaft 141 extends in the pond width direction and is rotatably supported by bearings (not shown) fixed to each of the pair of side walls 1c. The drive shaft 141 shown in FIG. 1 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. The drive sprocket 14 of this embodiment corresponds to an example of a drive wheel that transmits a driving force to the endless chain 11 and causes the endless chain 11 to travel.

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 rotates clockwise, causing the endless chain 11 to run clockwise. Hereinafter, the clockwise rotation of the drive sprocket 14 in FIG. 1 will be referred to as normal rotation driving, and the clockwise rotation of the endless chain 11 in FIG. 1 will be referred to as normal rotation driving. When the drive sprocket 14 is driven to rotate normally, the water surface orbit portion 11w of the endless chain 11 located on the water surface orbit Tw travels from the upstream side to the downstream side.

Further, the motor 21 has a torque limiter function. For example, if a foreign object gets caught in the raking member 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 object from being caught, the motor 21 rotates in reverse (rotates counterclockwise in FIG. 1) for a short period of time. As the motor 21 reverses, the drive sprocket 14 rotates counterclockwise in FIG. 1, causing the endless chain 11 to run counterclockwise (so-called reverse operation). Hereinafter, the rotation of the drive sprocket 14 counterclockwise in FIG. 1 will be referred to as reverse rotation driving, and the rotation of the endless chain 11 counterclockwise in FIG. 1 will be referred to as reverse rotation driving. When the drive sprocket 14 is reversely driven, the water surface orbit portion 11w travels from the downstream side to the upstream side.

The other sprockets 15 to 17 are driven sprockets that rotate following the running of the endless chain 11. Fixed shafts 151, 161, and 171 are passed through the center portions of the sprockets 15 to 17. Each of the fixed shafts 151, 161, 171 is fixedly arranged so as not to rotate around the shaft. All of the sprockets 15 to 17 are rotatable about their fixed shafts 151, 161, and 171. Each of the sprockets 14 to 17 is a rotating ring that rotates around the drive shaft 141 and fixed shafts 151, 161, and 171 as rotation axes. In the following description, the sprocket 15 disposed on the downstream side of the water surface trajectory Tw will be referred to as an intermediate sprocket 15. This intermediate sprocket 15 corresponds to an example of a driven wheel.

A plurality of scraping members 12 are attached over the entire circumference of the orbit of the endless chain 11 at equal or approximately equal intervals in the circulation direction. A bottom rail 23 extending in the longitudinal direction of the settling tank 1 along the bottom 1d of the settling tank 1 is fixed to the bottom 1d of the settling tank 1. In the pond bottom 1d, the scraping member 12 moves along the scraping track Tk by being guided by the pond bottom rail 23, and scrapes up the sludge that has settled in the pond bottom 1d.

When the endless chain 11 rotates normally, the raking member 12 located on the raking track Tk moves along the pond bottom 1d from the downstream side to the upstream side. The sludge that has settled on the pond bottom 1d is scraped up toward the sludge pit 50 on the upstream side by the scraping member 12 that moves on the pond bottom 1d. The sludge collected in the sludge pit 50 is discharged to the outside of the settling tank 1 by a sludge pump (not shown).

Scum is floating on the water surface WL of the settling tank 1. When the endless chain 11 rotates normally, the scraping member 12 located on the water surface trajectory Tw moves along the water surface WL from the upstream side to the downstream side. The scum floating on the water surface WL is scraped toward the scum removal device 30 on the downstream side by the scraping member 12 moving on the water surface trajectory Tw. The scum gathered on the side of the scum removing device 30 is discharged to the outside of the settling tank 1 by the scum removing device 30 together with the water in the settling tank 1. Further, the water in the settling tank 1 from which scum and sludge have been removed passes under the scum removal device, flows into the drainage gutter 40, flows from the drain gutter 40 to a drainage channel (not shown), and is drained to the outside of the settling tank 1. be done.

The endless chain 11 is installed with an appropriate margin in the circulation direction from the time it is installed in the settling basin 1, in order to prevent the driving force for running the endless chain 11 from increasing. The endless chain 11 has an amount of slack corresponding to its allowance. Furthermore, for a while after the start of running, the endless chain 11 tends to stretch due to break-in and creep phenomena, and as a result, the slack tends to gradually increase compared to when it was installed. Note that after the endless chain 11 has been running for a certain amount of time, the elongation hardly occurs.

When the endless chain 11 runs, a running load caused by the scraping member 12 scraping up sludge is applied to the scraping track portion 11k of the endless chain 11 located on the scraping track Tk. When the endless chain 11 is running in normal rotation, tension corresponding to the running load is generated in the scraping track portion 11k and the upstream track portion 11u located in the upstream track Tu of the endless chain 11. . On the other hand, slack occurs in the water surface track portion 11w of the endless chain 11 and the downstream track portion 11l located in the downstream track Tl. FIG. 1 shows a state in which slack has occurred in the water surface track portion 11w and the downstream track portion 11l. As shown in Figure 1, the downstream trajectory Tl is longer than the water surface trajectory Tw, and while the water surface trajectory Tw is horizontal or almost horizontal, the downstream trajectory Tl is highly inclined, and the water surface trajectory The slack in the downstream track portion 11l is greater than the slack in the portion 11w.

Next, a return rail, which is an example of a rail member, will be described. The sludge scraping device 10 shown in FIG. 1 is provided with a downstream return rail 24 and an upstream return rail 25 as rail members.

A downstream return rail 24 is fixed on the downstream side of the sedimentation basin 1 at a predetermined height position from the basin bottom 1d, which is substantially parallel to the basin bottom 1d and extends in the longitudinal direction of the settling basin 1. . This downstream return rail 24 is attached to a plurality of downstream pedestals 247 fixed to each of the pair of side walls 1c. When the endless chain 11 is running in normal rotation, the scraping member 12 attached to the endless chain 11 is moved to the downstream return rail 24 on the scraping track Tk side (also called the downstream side) of the largely slack downstream track Tl. Move guided. That is, the downstream return rail 24 is installed on the scraping track Tk along the scraping track Tk, and is attached to the underwater track portion 11l-1 of the endless chain 11 that runs on the scraping track Tk side of the downstream track Tl. A scraping member 12 is placed thereon, and the scraping member 12 slides, and corresponds to an example of the first rail member. As shown in FIG. 1, the trajectory on the scraping trajectory Tk side in the downstream trajectory Tl is a horizontal trajectory.

Further, an upstream return rail 25 extending in the water flow direction along the water surface WL is fixed on the upstream side of the settling tank 1 and near the water surface WL. That is, the upstream return rail 25 is installed on the water surface side, on which the scraping member 12 attached to the water surface track portion 11w of the endless chain 11 is placed, and the scraping member 12 slides. This corresponds to an example of a two-rail member. This upstream return rail 25 is attached to a plurality of upstream pedestals 257 fixed to each of the pair of side walls 1c. The scraping member 12 attached to the endless chain 11 moves while being guided by the upstream return rail 25 on the water surface trajectory Tw.

FIG. 2 is a partially enlarged view of section A in FIG. 1. FIG. In FIG. 2, the endless chain 11 is shown by a dashed dotted line except for a part.

The endless chain 11 is a metal chain in which a plurality of link members 110 are connected. Note that a resin chain may be used as the endless chain 11. Each link member 110 is connected by a connecting pin (not shown). In this embodiment, a link member 110 provided with a stay 113 is arranged every 20 link members 110 connected in the circulation direction of the endless chain 11. In FIG. 2, the link member 110 provided with the stay 113 is shown at the left end. This stay 113 is for connecting the link member 110 and the scraping member 12. The stay 113 and the scraping member 12 shown at the left end of FIG. 2 are coupled with a screw (not shown). Although two more scraping members 12 are shown in FIG. 2, the link member to which these two scraping members 12 are connected is not shown, and the stay is also not shown.

The scraping member 12 includes a flight plate 121, a return shoe 122, and a regulating member 123. The flight plate 121 is made of stainless steel and has a U-shaped cross section extending in the width direction of the pond. The scraping surface 121c located between the bent surfaces 121a and 121b of the flight plate 121 has a rectangular shape. The return shoe 122 and the regulating member 123 are provided at both ends of the flight plate 121, respectively. Note that the flight plate 121 shown in FIG. 2 also has a protruding edge 121d that protrudes from the bending surface 121a on the opposite side to the endless chain 11 side.

As shown in FIG. 2, the upstream return rail 25 is a rail member extending from the drive sprocket 14 to the intermediate sprocket 15. More specifically, the upstream return rail 25 shown in FIG. 2 extends from directly above the center of the drive sprocket 14 to directly above the center of the intermediate sprocket 15; It may extend from a position closer to the intermediate sprocket 15 than the intermediate sprocket 15, or it may extend from a position closer to the upstream wall 1a (see FIG. 1) than directly above it. Alternatively, the sprocket may extend to a position closer to the driving sprocket 14 than directly above the center of the intermediate sprocket 15, or to a position closer to the downstream wall 1b (see FIG. 1) than directly above the center of the intermediate sprocket 15. It may be something.

The upstream return rail 25 includes a sliding contact portion 250 and a lower mounting portion 251.

FIG. 3(a) is a sectional view taken along line BB in FIG. FIG. 3A is a cross-sectional view taken along a vertical line passing through the center of the drive sprocket 14, and the left-right direction of the figure is the width direction of the settling tank 1. Note that in FIG. 3A, the drive chain 211 (see FIG. 1) that transmits rotational force to the drive sprocket 14 is not shown.

As shown in FIG. 3(a), the link member 110 includes a pair of left and right link plates 111, 111 facing each other in the width direction of the pond, and a barrel portion 112 that connects the pair of left and right link plates 111, 111. There is.

The scraping member 12 shown in FIG. 3(a) is a scraping member 12 attached to the water surface orbit portion 11w shown in FIGS. A scraping shoe 124 is provided on the upper side. When the link member 110 to which the scraping member 12 shown in FIG. It comes into sliding contact with the pond bottom rail 23 shown in 1.

Moreover, at the end of the raking member 12 shown in FIG. 3(a) in the pond width direction, a return shoe 122 and a regulating member 123 are provided at the lower part on the side opposite to the water surface side.

The lower end portion of the return shoe 122 shown in FIG. 3A protrudes below the flight plate 121, and the lower end of the return shoe 122 is placed on the sliding contact portion 250 of the upstream return rail 25. When the link member 110 to which the scraping member 12 shown in FIG. The outer edge of the return shoe 122 in the pond width direction corresponds to the edge of the flight plate 121 in the vertical direction. On the other hand, a projection 1221 projecting downward is provided at the lower corner of the return shoe 122 on the inner side in the width direction of the pond. That is, the protrusion 1221 protrudes further downward than the lower end portion of the return shoe 122 that protrudes further downward than the flight plate 121.

The regulating member 123 has a base portion 1231, an arm portion 1232, and a protruding portion 1233. The base portion 1231 of the regulating member 123 is bolted to the scraping member 12 with the return shoe 122 interposed therebetween, so that the return shoe 122 can be easily replaced. The arm portion 1232 is a portion extending downward from the inside of the base portion 1231 in the width direction of the pond. The protruding part 1233 is provided at the tip of the arm part 1232, is bent 90 degrees from the arm part 1232, and protrudes outward in the pond width direction. The arm portion 1232 and the protruding portion 1233 have a hook-like shape.

Further, FIG. 3(a) shows the downstream end surface of the upstream return rail 25. As shown in FIG. As shown in FIG. 3A, the upstream return rail 25 has an upside-down L-shaped cross section. The mounting portion 251 of the upstream return rail 25 is fixed to the upstream pedestal 257 with a screw (not shown). The sliding contact portion 250 of the upstream return rail 25 projects inward in the pond width direction. That is, the protruding portion 1233 of the regulating member 123 protruding outward in the pond width direction protrudes so as to be opposed to the protruding portion 1233 with a shifted position in the vertical direction. More specifically, the sliding contact portion 250 of the upstream return rail 25 and the protruding portion 1233 of the regulating member 123 shown in FIG. 3(a) are spaced apart from each other in the vertical direction (eg, 10 mm). Further, the tip 2501 of the sliding portion 250 in the protruding direction (the tip in the width direction) and the tip 1233t of the protruding portion 1233 in the protruding direction are spaced apart from each other in the width direction (for example, greater than 0 mm and less than 25 mm).

Furthermore, the protruding tip 2501 of the sliding contact portion 250 of the upstream return rail 25 is aligned with the protrusion 1221 of the return shoe 122 in the vertical direction and is opposed to the protrusion 1221 with an interval in the pond width direction. When the raking member 12 shifts in the pond width direction, the protrusion 1221 of the return shoe 122 comes into contact with the protruding end 2501 of the sliding contact portion 250, and the raking member 12 is prevented from shifting further in the pond width direction. The above-mentioned raking shoe 124 is also provided with a protrusion 1241 that prevents the raking member 12 from shifting in the pond width direction by coming into contact with the pond bottom rail 23.

FIG. 3(b) is a diagram showing the upstream return rail 25 and the regulating member 123 when sloshing occurs due to an earthquake and the water surface track portion 11w swings in the pond width direction.

In FIG. 3B, the tip 2501 of the sliding contact portion 250 in the protruding direction has slipped under the protrusion 1221 of the return shoe 122 due to the shaking caused by the earthquake. However, the base of the protruding portion 1233 with respect to the arm portion 1232 is in contact with the tip 2501 in the protruding direction, and the water surface orbit portion 11w (see FIGS. 1 and 2) is prevented from swinging further in the pond width direction. has been done. Therefore, the base portion of the protrusion 1233 corresponds to an example of a lateral restriction portion. Note that if the arm portion 1232 extends further downward, the arm portion 1232 will come into contact with the tip 2501 of the sliding contact portion 250 in the protruding direction. In this case, the arm portion 1232 corresponds to an example of a lateral restriction portion.

Further, the protruding portion 1233 further protrudes outward in the width direction of the pond, and before the base portion of the protruding portion 1233 comes into contact with the protruding tip 2501 of the sliding contact portion 250, the protruding tip 1233t of the protruding portion 1233 contacts the mounting portion 250. The base portion of the sliding contact portion 250 may be contacted. Furthermore, if the arm portion 1232 extends further downward, the tip 1233t of the protruding portion 1233 in the protruding direction will come into contact with the attachment portion 251.

FIG. 3(c) is a diagram illustrating a situation where the protruding portion 1233 of the regulating member 123 contacts the sliding contact portion 250 of the upstream return rail 25 from above.

As represented by the dashed line shown in FIG. 2, the upstream return rail 25 is installed below the portion of the endless chain 11 that passes through the 12 o'clock position of the drive sprocket 14. Therefore, the portion of the endless chain 11 that has passed the 12 o'clock position of the drive sprocket 14 approaches the upstream end portion of the upstream return rail 25 from diagonally above, and the protruding portion 1233 of the regulating member 123 It enters below the sliding contact portion 250 of the upstream return rail 25.

The position of the raking member 12 to which the regulating member 123 shown in FIG. The sliding portion 250 of the upstream return rail 25 may be contacted from above.

Here, in this embodiment, a surface connecting the tip 1233t in the protrusion direction and the lower end of the hook-shaped protrusion 1233 gradually slopes downward from the tip 1233t in the protrusion direction toward the lower end. Hereinafter, the downwardly inclined surface connecting the protrusion direction tip 1233t and the lower end of the hook-shaped protrusion 1233 may come into contact with the sliding contact part 250 of the upstream return rail 25, as shown in FIG. 3(c). Therefore, it is called a contact surface 1233s.

A tip 2501 in the protruding direction of the sliding contact portion 250 of the upstream return rail 25 is in contact with the contact surface 1233s shown in FIG. 3(c). As described above, the portion of the endless chain 11 that has passed the 12 o'clock position of the drive sprocket 14 approaches the upstream end portion of the upstream return rail 25 from diagonally above, and is originally the protruding portion of the regulating member 123. 1233 travels on a downward trajectory in order to enter below the sliding contact portion 250 of the upstream return rail 25. In addition, as the endless chain 11 travels, the protruding portion 1233 provided with the contact surface 1233s in contact with the tip 2501 in the protruding direction is directed downward following the slope of the contact surface 1233s. As a result, the regulating member 123 provided with the contact surface 1233s in contact with the tip 2501 in the protruding direction can smoothly move downward, and the running of the endless chain 11 can be prevented from being disturbed.

FIG. 4 is a diagram schematically showing the downstream side of the water in the settling tank 1 in the water flow direction from below the scum removal device 30 shown in FIG. 1. The endless chain 11 is made up of a plurality of link members 110 (see FIG. 2) connected together, and is represented by a single thick black line in FIG.

In FIG. 4, the front side of the paper is the upstream side in the water flow direction, and the back side of the paper is the upstream side in the water flow direction. Further, the left-right direction is the width direction of the settling tank 1. In FIG. 4, the downstream track Tl of the endless chain 11 extends toward the sprocket 16 shown in gray at the back of the page, and the scraping track Tk returns from the back of the page toward the front of the page. There is.

FIG. 4 shows the scraping member 12 attached to the endless chain 11 with a stay 113 interposed therebetween. In FIG. 4, five scraping members 12 are shown. A return shoe 122 and a regulating member 123 are provided at both ends of each scraping member 12. In the scraping member 12 attached to the downstream track portion 11l of the endless chain 11 shown in FIG. 4, the protruding portion of the return shoe 122 protrudes downward, and the arm portion 1232 of the regulating member 123 also extends downward. Extending. Note that the bent surfaces 121a and 121b of the flight plate 121 protrude toward the front side.

On the other hand, in the scraping member 12 attached to the scraping track portion 11k of the endless chain 11 shown in FIG. It extends to Further, the raking shoe 124 is on the lower side and is in sliding contact with the pond bottom rail 23. Note that the scraping surface 121c of the flight board 121 is located on the front side.

Further, in FIG. 4, the downstream return rails 24 attached to the downstream pedestals 247 shown in gray are shown at both ends in the pond width direction, and the pond bottom rails 23 are shown in the pond width direction at the pond bottom 1d. shown at each end.

Like the upstream return rail 25, the downstream return rail 24 has an upside-down L-shaped cross-sectional shape, and is composed of a sliding contact portion 240 and a mounting portion 241 on the lower side. The mounting portion 241 of the downstream return rail 24 is fixed to the downstream pedestal 247 with a screw (not shown). Further, like the upstream return rail 25, the sliding contact portion 240 of the downstream return rail 24 also protrudes inward in the pond width direction. That is, the protruding portion 1233 of the regulating member 123 of the raking member 12 of the underwater orbit portion 11l-1 protruding outward in the pond width direction protrudes so as to be opposed to the protruding portion 1233 with a shifted position in the vertical direction. More specifically, in the downstream return rail 24 as well, the sliding contact portion 240 and the protruding portion 1233 of the regulating member 123 are spaced apart from each other in the vertical direction (eg, 10 mm). Furthermore, the tip 2401 in the protruding direction (the tip in the width direction) of the sliding contact portion 240 and the tip in the protruding direction of the protruding portion 1233 are spaced apart from each other in the width direction (for example, greater than 0 mm and less than 25 mm).

Further, the protruding tip 2401 of the sliding contact portion 240 of the downstream return rail 24 is also aligned vertically with the protrusion 1221 of the return shoe 122 (see FIG. 3(a)), and is spaced apart in the pond width direction. They are facing each other. When the raking member 12 shifts in the pond width direction, the projection 1221 of the return shoe 122 (see FIG. 3(a)) comes into contact with the protruding tip 2401 of the sliding contact portion 240, and the raking member 12 shifts in the pond width direction. This prevents the deviation from occurring.

As shown in FIGS. 4 and 1, the portion of the endless chain 11 running on the water surface track Tw side of the downstream track Tl is curved downward and is slack. Hereinafter, the portion of the endless chain 11 running on the water surface trajectory Tw side in the downstream trajectory Tl will be referred to as a slack portion 11l-2. This slack portion 11l-2 approaches the downstream return rail 24 from diagonally above, and originally, the protruding portion 1233 of the regulating member 123 attempts to enter below the sliding contact portion 240 of the downstream return rail 24. Travel on a trajectory heading towards. In addition, similarly to the case of the upstream return rail 25 described with reference to FIG. may come into contact. As the endless chain 11 travels, the protrusion 1233 provided with the contact surface 1233s in contact with the protrusion-direction tip 2401 of the downstream return rail 24 is also directed downward following the inclination of the contact surface 1233s. As a result, the regulating member 123 provided with the contact surface 1233s in contact with the tip 2401 in the protruding direction of the downstream return rail 24 moves smoothly downward, and the endless chain 11 also moves on the downstream return rail 24. It is possible to prevent this from becoming disordered. In particular, the slack portion 11l-2 of the endless chain 11 is curved downward and is slack, so the track is unstable, and the protrusion 1233 of the regulating member 123 is lower than the upstream return rail 25. The effect of the downwardly inclined contact surface 1233s of the protrusion 1233 is beneficial because it is easier to contact the downstream return rail 24.

FIG. 5 is a diagram showing a modification of the embodiment described above. In the following description, components having the same names as those described above will be described with the same reference numerals used up until now. In addition, in FIG. 5, the left-right direction of the figure is the pond width direction of the sedimentation tank 1, the right side of the figure is the inside in the pond width direction, and the left side is the outside in the pond width direction.

In FIG. 5A, the shape of the downstream return rail 24 is different from the shape of the downstream return rail described above. The downstream return rail 24 shown in FIG. 5(a) is provided with a guide portion 242 in addition to a sliding contact portion 240 and a mounting portion 241. The sliding contact portion 240 shown in FIG. 5(a) projects outward in the pond width direction. The guide portion 242 is provided with a guide surface 242s that slopes downward toward the inner side in the pond width direction. The guide surface 242s is inclined from a position one step lower than the sliding contact portion 240. On the other hand, the protruding portion 1233 of the regulating member 123 shown in FIG. 5(a) is not provided with a downwardly inclined surface.

In the left side of FIG. 5A, the lower end of the protruding portion 1233 in the protruding direction is in contact with the guide portion 242 of the downstream return rail 24.

As the endless chain 11 travels, the protruding portion 1233 shown in FIG. 5(a) is guided by the guide surface 242s of the guide portion 242 of the downstream return rail 24, and the regulating member 123 smoothly moves downward. , the lower end of the return shoe 122 is placed on the sliding contact portion 240 of the downstream return rail 24, as shown on the right side of FIG. 5(a). Note that a downwardly protruding protrusion 1221 similar to the protrusion 1221 shown in FIG. 3A is provided at the lower corner of the return shoe 122 on the outside in the pond width direction as shown in FIG. It faces the protruding tip 2401 of the sliding contact portion 240 that protrudes outward in the width direction.

In FIG. 5(b) as well, the shape of the downstream return rail 24 has changed. The downstream return rail 24 shown in FIG. 5(b) is also provided with a guide portion 242 in addition to a sliding contact portion 240 and a mounting portion 241 that protrude outward in the pond width direction. The slope is inclined from the height position of the sliding contact portion 240. Further, the protruding portion 1233 of the regulating member 123 shown in FIG. 5(b) is provided with a contact surface 1233s that is inclined downward. The protrusion 1233 shown in FIG. 5(b) is slightly smaller than the protrusion 1233 shown in FIG. 3(a), but the basic configuration is the same.

In the diagram shown on the left side of FIG. 5(b), the contact surface 1233s of the protrusion 1233 is in surface contact with the guide surface 242s of the downstream return rail 24. That is, the angle of inclination of the contact surface 1233s of the protrusion 1233 and the angle of inclination of the guide surface 242s of the downstream return rail 24 are the same.

As the endless chain 11 runs, the regulating member 123 shown in FIG. 5(b) smoothly moves downward due to the inclination of the contact surface 1233s of the protrusion 1233 and the inclination of the guide surface 242s of the downstream return rail 24. 5(b), the lower end of the return shoe 122 is placed on the sliding contact portion 240 of the downstream return rail 24. Note that a projection 1221 for preventing slippage is also provided at the lower corner of the return shoe 122 on the outside in the width direction of the pond, as shown in FIG. is facing.

In the modified example described above, the shape of the downstream return rail 24 is different, but the shape of the upstream return rail 25 may also be the same as the shape of the downstream return rail 24 described here, or The shape of the side return rail 25 may be the same as the shape of the upstream return rail 25 shown in FIG.

Next, a sludge scraping device according to a second embodiment of the present invention will be described. Also in the description of the sludge scraping device of the second embodiment, components with the same names as those described in the description of the sludge scraping device of the first embodiment are given the same reference numerals as those used in the description of the sludge scraping device of the first embodiment. The same reference numerals are used to explain the explanation.

6 and 7 are diagrams of the return rail of the second embodiment viewed from above. That is, it is a plan view of the upstream return rail 25 and the downstream return rail 24 , respectively. In both FIG. 6 and FIG. 7, the left-right direction in the drawings is the pond width direction.

6(a) and 7(b), a pair of upstream return rails 25 are shown close together on the upper side, and a pair of downstream return rails 25 are shown on the lower side. The side return rail 24 is also shown close up. As mentioned above, both the pair of upstream return rails 25 and the pair of downstream return rails 24 are provided on both sides of the sedimentation tank 1 in the width direction, and originally they are installed apart, but in FIGS. In FIG. 7, they are shown close together due to space limitations. Moreover, whether it is the upstream return rail 25 or the downstream return rail 24, the middle part is omitted, and the upper side becomes the upstream side and the lower side becomes the downstream side.

Furthermore, the upstream return rail 25 and the downstream return rail 24 shown in FIG. 6(a) and the upstream return rail 25 and the downstream return rail 24 shown in FIG. The shape is an upside-down L-shape, with the mounting portions 251 and 241 being on the outside in the width direction of the pond, and the sliding contact portions 250 and 240 protruding inward in the width direction of the pond.

Further, both of the upstream return rail 25 and the downstream return rail 24 shown in FIG. 7(a) include upstream rail members 25-1, 24-1, intermediate rail members 25-2, 24-2, The three rail members 25-3 and 24-3 on the downstream side are connected (for example, by welding or bolting). These three rail members (25-1, 25-2, 25-3, 24-1, 24-2, 24-3) all have an upside-down L-shaped cross section, and are easy to install. The portions 251 and 241 are on the outside in the pond width direction, and the sliding contact portions 250 and 240 are protruded inward in the pond width direction.

On the other hand, the upstream return rail 25 and the downstream return rail 24 shown in FIG. 7(b) are each formed by bending one rail member. That is, the mounting parts 251 and 241 are located in the center, the sliding contact parts 250 and 240 are bent toward the outside in the pond width direction at the upstream end and the downstream end, respectively, and the sliding contact part 250 is located at the middle part. , 240 are bent inward in the pond width direction. Note that, like the upstream return rail 25 and the downstream return rail 24 shown in FIG. 7(a), a configuration in which three rail members are connected may be used. That is, an upstream rail member in which the sliding contact portions 250, 240 are bent outward in the pond width direction, an intermediate rail member in which the sliding contact portions 250, 240 are bent inward in the pond width direction, and a sliding contact portion. 250 and 240 may be connected to downstream rail members bent outward in the pond width direction.

In the first embodiment, whether it is the downstream return rail 24 or the upstream return rail 25, the sliding contact portions 240, 250 are located at the positions (upstream end, middle part, downstream end). It's the same regardless. On the other hand, in the downstream return rail 24 and the upstream return rail 25 in FIGS. 6(a) and 6(b), cutouts or Evacuation spaces are provided and vary depending on location.

That is, the sliding contact portions 250 of each of the pair of upstream return rails 25 shown in the upper side of FIGS. 6(a) and 6(b) are provided with cutouts 25c1 and 25c2 at the upstream and downstream ends. It is being The cutout 25c1 shown in FIG. 6(a) is a rectangular cutout on the inner side in the width direction of the pond, and the cutout 25c2 shown in FIG. 6(b) is a triangular cutout on the inner side in the widthwise direction of the pond. It is something that is missing. Moreover, the space provided by the cutout can also be said to be the space provided by retracting from the inside toward the outside in the pond width direction. Hereinafter, the space created by cutting out or the space created by retreating will be simply referred to as space. The sliding contact portion 250 of each of the pair of upstream return rails 25 shown on the upper side of FIGS. 6(a) and 6(b) has an inner portion in the pond width direction at the upstream end and a pond width A space S is provided on the inner side.

Furthermore, the sliding contact portions 240 of the pair of downstream return rails 24 shown on the lower side of FIGS. 6(a) and 6(b) also have cutouts 24c1 and 24c2 at the upstream and downstream ends. It is provided. The cutout 24c1 shown in FIG. 6(a) is also a rectangular cutout on the inner side in the pond width direction, and the cutout 24c2 shown in FIG. 6(b) is also a triangular cutout on the inner side in the pond width direction. It is something that is missing. Also, here too, the space created by notching can be said to be the space created by retreating from the inside in the width direction of the pond to the outside, and the space created by cutting out the pond can be said to be the space created by retreating from the inside to the outside in the width direction of the pond. In each sliding contact portion 240 of the downstream return rail 24, a space S' is provided at an inner portion in the pond width direction at the upstream end and an inner portion in the pond width direction at the downstream end.

In addition, in the upstream return rail 25 and the downstream return rail 24 shown in FIG. 25-2, 24-2, and the space created inside the upstream rail members 25-1, 24-1 is provided at a position shifted outward in the pond width direction from the upstream rail members 25-2, 24-2. 1, 24-1 to the outside in the pond width direction, and the space created inside the downstream rail members 25-3, 24-3 is the space created by retracting the downstream rail members 25-3, 24-1 to the outside in the pond width direction. It can be said that this is a space created by retracting 3 to the outside in the pond width direction. A space S is provided in the inner part in the pond width direction of the upstream end of the upstream return rail 25 shown in FIG. 7(a) and the inner part in the pond width direction of the downstream end, as shown in FIG. 7(a). A space S' is provided at an inner portion in the pond width direction of the upstream end of the downstream return rail 24 and an inner portion in the pond width direction of the downstream end.

Furthermore, in the upstream return rail 25 and the downstream return rail 24 shown in FIG. The space created inside the upstream end can be said to be a space created by retracting the upstream end to the outside in the width direction of the pond, and the space created inside the downstream end. This space can be said to be a space created by retracting its downstream end outward in the pond width direction. A space S is provided in the inner part in the pond width direction of the upstream end of the upstream return rail 25 shown in FIG. 7(b) and the inner part in the pond width direction of the downstream end, as shown in FIG. 7(b). A space S' is provided at an inner portion in the pond width direction of the upstream end of the downstream return rail 24 and an inner portion in the pond width direction of the downstream end.

The space S in the upstream return rail 25 in FIGS. 6(a) and 6(b) and the upstream return rail 25 in FIGS. 7(a) and 7(b) is also Interference with the protruding portion 1233 of the regulating member 123 also occurs in the space S' in the downstream return rail 24 in FIG. 7(b) and the downstream return rail 24 in FIGS. 7(a) and 7(b). It becomes a space to avoid. That is, in the upstream space S of the upstream return rail 25, the regulating member 123 of the scraping member 12 attached to the slack portion 11l-2 running on the water surface track Tw side of the upstream track Tu of the endless chain 11, This is a space near the area through which the endless chain 11 runs. In the example shown in FIG. 6, since there is no sliding contact portion 250 in this space S, the protruding portion 1233 of the regulating member 123 can enter below the sliding contact portion 250 using this space S. Even in the example shown in FIG. 7(b), since there is no sliding contact part 250 in this space S, the protruding part 1233 of the regulating member 123 uses this space S to move below the sliding contact part 250 in the intermediate part. You can get into it. In the example shown in FIG. 7(a), since there is no rail member itself, the protruding portion 1233 of the regulating member 123 utilizes this space S to enter below the sliding contact portion 250 of the intermediate rail member 25-2. be able to. Further, the upstream space S' in the downstream return rail 24 is an area through which the regulating member 123 of the scraping member 12 attached to the slack portion 11l-2 of the endless chain 11 passes when the endless chain 11 runs. It is a nearby space. In the example shown in FIG. 6, since there is no sliding contact portion 240 in this space S', the protruding portion 1233 of the regulating member 123 can enter below the sliding contact portion 240 using this space S'. Even in the example shown in FIG. 7(b), since there is no sliding contact part 240 in this space S', the protruding part 1233 of the regulating member 123 is lower than the sliding contact part 250 in the intermediate part by utilizing this space S'. You can get into the side. In the example shown in FIG. 7(a), since there is no rail member itself, the protruding portion 1233 of the regulating member 123 utilizes this space S' to extend below the sliding contact portion 240 of the intermediate rail member 24-2. You can get into it.

Here, both in FIGS. 6(a) and 6(b) and in FIGS. 7(a) and 7(b), the upstream space S in the upstream return rail 25 and the upstream space S in the downstream return rail 24 are Comparing the side spaces S', the latter is longer than the former. That is, in the example shown in FIG. 6, the notch width (retracted width) is the same, but the notch length (retracted length) is longer in the downstream return rail 24 than in the upstream return rail 25. In addition, in the example shown in FIG. The side return rail 24 is longer. Furthermore, in the example shown in FIG. 7(b), the length of the portion bent outward in the pond width direction (the upstream end and the downstream end) is longer than the length of the downstream return rail 25. 24 is longer. As described above, the slack portion 11l-2 of the endless chain 11 is slack, so the track is unstable, and the downstream return rail 24 has a long space to avoid interference with the protrusion 1233 of the regulating member 123. It is taken. Note that the space S' on the upstream side of the downstream return rail 24 may be wider than the space S on the upstream side of the upstream return rail 25. That is, in the example shown in FIG. 6, the notch width (retreat width) may also be wider in the downstream return rail 24 than in the upstream return rail 25. Further, in the example shown in FIG. 7(a), the mounting positions of the upstream rail members 25-1 and 24-1 are on the outer side in the pond width direction on the downstream return rail 24 than on the upstream return rail 25. Good too. Furthermore, in the example shown in FIG. 7(b), both the downstream return rail 24 and the upstream return rail 25 have the same bending width, but the downstream return rail 24 is bent outward in the pond width direction. The bending width for bending inward in the pond width direction may be wider than the width. In other words, the position of the attachment portion 241 may be shifted outward in the pond width direction from the center position.

Furthermore, even if the upstream return rail 25 in FIGS. 6(a) and 6(b) and the upstream return rail 25 in FIGS. 7(a) and 7(b) are used, the upstream return rail 25 in FIGS. Even with the downstream return rail 24 shown in b) and the downstream return rail 24 shown in FIGS. This is a space to avoid interference when the endless chain 11 exits from the protrusion 1233, or to avoid interference with the protrusion 1233 when the endless chain 11 runs in reverse. In addition, whether the upstream return rail 25 or the downstream return rail 24 is used, the downstream spaces S and S' have the same length as the upstream spaces S and S', but the downstream space S , S' may be shorter than the upstream spaces S, S'. Also, although the widths are the same, the downstream spaces S and S' may be narrower than the upstream spaces S and S'.

Note that contact with the protrusion 1233 is preferably avoided more easily at the downstream end of the downstream return rail 24 than at the downstream end of the upstream return rail 25; It is preferable to avoid the upstream end of the upstream return rail 25 more easily than the end, and avoid the upstream end of the downstream return rail 24 more than the upstream end of the upstream return rail 25. It is preferable to make it easier.

FIG. 8 shows how the protruding part of the regulating member approaches the upstream end of the downstream return rail of the second embodiment from diagonally above and enters below the sliding contact part of the downstream return rail. It is a diagram showing the situation step by step. In FIG. 8, the left-right direction of the figure is the width direction of the sedimentation basin 1, and only both end portions in the pond width direction are shown, and the middle portion of the raking member 12 in the pond width direction is omitted from the illustration. Furthermore, the endless chain 11 is also omitted from illustration.

FIG. 8(a) is a diagram showing, from the downstream side, how the protruding portion 1233 of the regulating member 123 approaches the upstream end portion of the downstream return rail 24 shown in FIG. 6(a) from diagonally above. be. The regulating member 123 in the second embodiment is the same as the regulating member 123 in the first embodiment, and includes a base portion 1231, an arm portion 1232, and a protruding portion 1233. The arm portion 1232 is a portion extending downward, and the protruding portion 1233 is bent at 90 degrees from the arm portion 1232 and protrudes outward in the pond width direction. The raking member 12 shown in FIG. 8(a) is closer to one end in the pond width direction (left side in FIG. 8). Therefore, the protruding portion 1233 of the regulating member 123 on the one end side, which is attached to the scraping member 12, approaches the upstream side of the sliding contact portion 240 on the downstream return rail 24. A notch 24c1 is provided at the upstream end of the sliding contact portion 240 in the downstream return rail 24 shown in FIG. There is an open space S' towards the outside. Therefore, the approaching protrusion 1233 of the regulating member 123 on the one end side may be able to enter below the sliding contact portion 240 by utilizing this space S'. That is, it may be possible to prevent the protruding portion 1233 of the regulating member 123 from coming into contact with the downstream return rail 24 .

In the example shown in FIG. 8, the displacement of the raking member 12 in the pond width direction is quite large, and even if the space S' is provided, the protrusion 1233 of the regulating member 123 is It has come into contact with the side return rail 24. However, since the contact surface 1233s of the protrusion 1233 is a surface that gradually slopes downward toward the other end in the channel width direction, the protrusion 1233 follows the inclination of the contact surface 1233s as the endless chain 11 runs. and is directed downward. This point is the same as that described using FIG. 3(c) in the first embodiment.

In FIG. 8(c), the protruding portion 1233 of the regulating member 123 enters below the sliding contact portion 240, and the lower end of the return shoe 122 is placed on the sliding contact portion 240 of the downstream return rail 24. . Furthermore, the displacement of the raking member 12 toward one end in the pond width direction is eliminated, and the raking member 12 is in its normal position. The protrusion 1233 of the regulating member 123 shown in FIG. 8(c) has not yet exceeded the notch 24c1 of the downstream return rail 24 shown on the lower side of FIG. It is located at the position of arrow c.

As the endless chain 11 continues to run, the protruding part 1233 of the regulating member 123 shown in FIG. 8(c) eventually exceeds the notch 24c1 of the downstream return rail 24, and becomes a sliding contact part where the space S' is not provided. It reaches below 240. The protrusion 1233 of the regulating member 123 shown in FIG. 8(d) is located at the position indicated by the arrow d shown in FIG. 6(a). The tip of the protruding portion 1233 of the regulating member 123 shown in FIG. 8D is located directly below the tip of the sliding portion 240 of the downstream return rail 24 in the protruding direction.

When sloshing occurs due to an earthquake and the underwater track portion 11l-1 (see FIGS. 1 and 4) swings in the pond width direction, the protrusion 1233 of the regulating member 123 shown in FIG. 8(c) The tip 1233t in the protruding direction contacts the base of the sliding contact portion 240 with respect to the attachment portion 241 on the downstream return rail 24, and the underwater track portion 11l-1 is suppressed from swinging further in the pond width direction. However, if sloshing occurs due to an earthquake and the underwater track portion 11l-1 swings upward, the protrusion 1233 of the regulating member 123 shown in FIG. 8(c) will not hit anywhere on the downstream return rail 24. They do not touch each other, and upward swing cannot be suppressed. On the other hand, even if sloshing occurs due to an earthquake and the underwater track portion 11l-1 swings upward, the protrusion 1233 of the regulating member 123 shown in FIG. The submerged track portion 11l-1 contacts the protruding tip end portion of the sliding contact portion 240 of the downstream return rail 24 from below, and the underwater track portion 11l-1 is prevented from swinging upward any further. The tip of the protruding portion 1233 shown in FIG. 8(d) in the protruding direction corresponds to an example of an upward restriction portion. In addition, when the underwater track portion 11l-1 swings in the pond width direction, the protrusion direction tip 1233t of the protrusion 1233 shown in FIG. Function.

The relationship between the downstream return rail 24 and the protrusion 1233 of the regulation member 123 in the second embodiment has been described above, but in this second embodiment, the relationship between the upstream return rail 25 and the protrusion 1233 of the regulation member 123 is The relationship is the same.

Although it depends on the degree of deviation of the raking member 12 in the pond width direction, in most cases, the space S' prevents the protrusion 1233 of the regulating member 123 from coming into contact with the downstream return rail 24. be able to. Therefore, the space S' may be provided and the inclined contact surface 1233s (see FIG. 8(b)) of the protrusion 1233 may be omitted. For example, the regulating member 123 shown in FIG. 5(a) may be used.

FIG. 9 is a diagram showing a modification of the second embodiment. Similarly to FIG. 8, in FIG. 9, the left and right direction of the figure is the width direction of the sedimentation tank 1, and only both end portions in the pond width direction are shown, and the intermediate portion of the raking member 12 in the pond width direction is omitted. . Furthermore, the endless chain 11 is also omitted from illustration.

Also in the modification of the second embodiment, the sliding contact portions 240 of each of the pair of downstream return rails 24 are provided with cutouts 24c1 at the upstream and downstream ends. On the other hand, the regulating member 123 attached to the scraping member 12 is different from the regulating member 123 attached to the scraping member 12 shown in FIG. That is, the arm portion 1232 of the regulating member 123 shown in FIG. 9 is a portion extending downward from the outside in the width direction of the base portion 1231. The protruding portion 1233 is bent at 90 degrees from the tip of the arm portion 1232 and protrudes inward in the pond width direction.

The protruding portion 1233 of the regulating member 123 shown in FIG. 9(a) is located at the position indicated by the arrow d shown in FIG. 240 is located directly below the tip portion in the protruding direction.

FIG. 9(b) shows a situation when sloshing occurs due to an earthquake and the underwater track portion 11l-1 (see FIGS. 1 and 4) swings toward one end in the pond width direction (to the left in FIG. 9). The arm portion 1232 located on the outside in the pond width direction of the regulating member 123 on the other end side in the pond width direction (right side in FIG. 9) shown in FIG. It comes into contact with the tip 2401 of the contact portion 240 in the protruding direction, and the underwater track portion 11l-1 is prevented from swinging any further toward one end in the pond width direction.

FIG. 9(c) shows a situation when sloshing occurs due to an earthquake and the underwater track portion 11l-1 now swings toward the other end in the pond width direction (to the right in FIG. 9). The arm portion 1232 located on the outside in the pond width direction of the regulating member 123 on one end side in the pond width direction (the left side in FIG. 9) shown in FIG. 9(c) is in sliding contact with the downstream return rail 24 on the one end side in the pond width direction. 240 in the protruding direction, and the underwater track portion 11l-1 is suppressed from swinging any further toward the other end in the pond width direction.

Next, a sludge scraping device according to a third embodiment of the present invention will be described. Also in the description of the sludge scraping device of the third embodiment, components with the same names as those described in the description of the sludge scraping device of the first embodiment are given the same reference numerals as those used in the description of the sludge scraping device of the first embodiment. The same reference numerals are used to explain the explanation.

FIG. 10 is a diagram showing the relationship between the downstream return rail 24 and the protrusion 1233 of the regulating member 123 in the sludge scraping device of the third embodiment. FIG. 9 is a cross-sectional view taken along a vertical line passing through the center of the sprocket 16, which is a driven sprocket, and the left-right direction of the figure is the width direction of the settling tank 1.

The relationship between the upstream return rail 25 and the protrusion 1233 of the regulating member 123 in the sludge scraping device of the third embodiment is the same as that of the sludge scraping device of the first embodiment, and is as shown in FIG. 3(a). be. In FIG. 10, the upstream return rail 25 shown in FIG. 3(a) is shown by a chain line for reference.

On the other hand, the downstream return rail 24 is installed outside the upstream return rail 25 in the pond width direction. In FIG. 10, the downstream return rail 24 is shown in gray. This downstream return rail 24 has the same shape as the upstream return rail 25, has an upside-down L-shaped cross section, and is composed of a sliding contact portion 240 and a mounting portion 241 at the lower portion. has been done. In the third embodiment, the distance between the upstream return rail 25 and the protruding portion 1233 of the regulating member 123 in the scraping member 12 that slides on the upstream return rail 25 is greater than the distance in the pond width direction The distance in the pond width direction between the raking member 12 sliding on the downstream return rail 24 and the protrusion 1233 of the regulating member 123 is longer. As described above, since the slack portion 11l-2 of the endless chain 11 is slack, the trajectory is unstable, and the raking member 12 attached to the slack portion 11l-2 tends to be displaced in the pond width direction. Therefore, in the downstream return rail 24, the distance between the regulating member 123 and the protrusion 1233 in the pond width direction is longer than that in the upstream return rail 25, so that contact with the protrusion 1233 can be easily avoided. If the downstream return rail 24 is installed outside the upstream return rail 25 in the pond width direction, it may not be necessary to provide the cutouts 24c1 and 24c2 in the downstream return rail 24 as explained using FIG. be. However, the farther the downstream return rail 24 is installed on the outside in the pond width direction, the more difficult it becomes for the regulating member 123 to regulate the upward direction. In some cases, it may be preferable to provide the contact portion 240 with a wide portion.

Furthermore, by shifting the installation locations of the downstream return rail 24 and the upstream return rail 25 in the pond width direction, the sliding contact locations of the return shoe 122 are different, and wear on the return shoe 122 can be dispersed.

Note that the more the downstream return rail 24 is provided on the outer side in the pond width direction, the easier it is to avoid the protrusion 1233 of the regulating member 123 coming into contact with the downstream return rail 24. Therefore, the downstream return rail 24 may be provided on the outside in the pond width direction, and the inclined contact surface 1233s of the protrusion 1233 may be omitted. For example, the regulating member 123 shown in FIG. 5(a) may be used.

Next, a sludge scraping device according to a fourth embodiment of the present invention will be described. Also in the description of the sludge scraping device of the fourth embodiment, components with the same names as those described in the description of the sludge scraping device of the first embodiment are given the same reference numerals as those used in the description of the sludge scraping device of the first embodiment. The same reference numerals are used to explain the explanation.

FIG. 11 is a diagram showing the relationship between the downstream return rail 24 and the protrusion 1233 of the regulating member 123 in the sludge scraping device of the fourth embodiment. Like FIG. 10, this FIG. 11 is also a sectional view taken along a vertical line passing through the center of the sprocket 16, which is a driven sprocket, and the left-right direction of the figure is the width direction of the settling tank 1.

The relationship between the upstream return rail 25 and the protrusion 1233 of the regulating member 123 in the sludge scraping device of the fourth embodiment is also the same as that of the sludge scraping device of the first embodiment, as shown in FIG. 3(a). be. In this FIG. 11 as well, the upstream return rail 25 shown in FIG. 3(a) is shown by a chain line for reference. In the upstream return rail 25, a protruding tip 2501 of the sliding contact portion 250 faces inward in the pond width direction.

On the other hand, in the downstream return rail 24, the protruding tip 2401 of the sliding contact portion 240 faces outward in the pond width direction. In FIG. 11 as well, the downstream return rail 24 is shown in gray. This downstream return rail 24 has the same shape as the upstream return rail 25, has an upside-down L-shaped cross section, and is composed of a sliding contact portion 240 and a mounting portion 241 at the lower portion. has been done. However, as described above, the protruding direction of the sliding contact portion 240 is different. This is because the upstream return rail 25 and the downstream return rail 24 are attached in opposite directions. That is, the upstream return rail 25 has a portion (sliding contact portion 250) of the scraping member 12 attached to the water surface track portion 11w (see FIGS. 1 and 2) that protrudes toward the side where the regulating member 123 is provided. In contrast, the downstream return rail 24 protrudes toward the side where the regulating member 123 of the scraping member 12 attached to the underwater track portion 11l-1 (see FIGS. 1 and 4) is provided. The downstream return rail 24 has a portion (sliding contact portion 240) that protrudes on the side opposite to the side where the regulating member 123 of the scraping member 12 attached to the underwater track portion 11l-1 is provided. It is something that you have. As a result, the distance between the downstream return rail 24 and its downstream return rail is smaller than the distance in the pond width direction between the upstream return rail 25 and the protrusion 1233 of the regulating member 123 in the raking member 12 that slides on the upstream return rail 25. The distance in the pond width direction from the protrusion 1233 of the regulating member 123 in the scraping member 12 sliding on the rail 24 is longer, and even in the sludge scraping device of the fourth embodiment, the upstream return rail The downstream return rail 24 is less likely to interfere with the protrusion 1233 of the regulating member 123 than the downstream return rail 25 . As described above, since the slack portion 11l-2 of the endless chain 11 is slack, the trajectory is unstable, and the raking member 12 attached to the slack portion 11l-2 tends to be displaced in the pond width direction. Therefore, in the downstream return rail 24, the distance from the tip 1233t of the protrusion 1233 in the protrusion direction is longer than that in the upstream return rail 25, so that contact with the protrusion 1233 can be easily avoided.

Note that by directing the protruding tip 2401 of the sliding contact portion 240 of the downstream return rail 24 outward in the pond width direction, it is easier to avoid the protruding portion 1233 of the regulating member 123 from coming into contact with the downstream return rail 24. Become. Therefore, the downstream return rail 24 may be arranged with the protrusion-direction tip 2401 of the sliding contact portion 240 facing outward in the pond width direction, and the inclined contact surface 1233s of the protrusion portion 1233 may be omitted. For example, the regulating member 123 shown in FIG. 5(a) may be used.

In addition, whether it is the downstream return rail or the upstream return rail, it may have an upside-down L-shaped cross-section, a T-shaped cross-section, or a C-shaped cross-section. It may have a cross-sectional shape of a U-shape or a U-shape.

Furthermore, the intermediate sprocket 15 is omitted, the water surface trajectory Tw is eliminated, and a roughly triangular orbit is created in which the raking trajectory Tk, the upstream trajectory Tu that is the rising trajectory, and the inclined trajectory connecting the driving sprocket 14 and the sprocket 16 are connected. In the case of an endless chain running on a track, the upstream return rail 25 is no longer necessary and the downstream return rail 24 is present. The technology described here can also be applied to the sludge scraping device that has the following.

Finally, a modification of the regulating member will be described.

FIG. 12 is a diagram showing a modification of the regulating member. Like FIG. 3(a), FIG. 12 is a cross-sectional view taken along a vertical line passing through the center of the drive sprocket 14, and the left-right direction of the figure is the width direction of the settling tank 1. Note that in FIG. 12, as in FIG. 3A, the drive chain 211 (see FIG. 1) that transmits rotational force to the drive sprocket 14 is not shown.

The conventional regulating member 123 was attached to the raking member 12 and was located below the water surface WL. Further, the regulating member 123 had a protrusion 1233. On the other hand, the regulating member 19 shown in FIG. 12 is not attached to the raking member 12, but is fixedly arranged above the water surface WL. That is, it is provided near the upper corner of the scraping member 12. Note that a return shoe 122 is attached to the scraping member 12.

Further, the regulating member 19 shown in FIG. 12 has an upside-down L-shaped cross-sectional shape, and has a similar shape to the upstream return rail 25, and is oriented in the water flow direction in the same way as the upstream return rail 25. It has been extended to This regulating member 19 is attached to a plurality of attachment members (not shown here) fixed to each of the pair of side walls 1c, but this attachment member has a shorter length in the pond width direction than the upstream pedestal 257. It is something that can be done. That is, the attachment member only needs to extend to the vicinity of the upper corner of the scraping member 12.

The regulating member 19 shown in FIG. 12 has a lateral regulating section 191 and an upward regulating section 192. When sloshing occurs due to an earthquake and the water surface track portion 11w (see FIGS. 1 and 2) swings in the pond width direction, the vertical edge 12a of the raking member 12 comes into contact with the lateral regulation portion 191, causing the water surface track portion 11w to swing in the pond width direction. 11w is suppressed from swinging further in the pond width direction. Further, when sloshing occurs due to an earthquake and the water surface track portion 11w swings upward, the edge 12b of the raking member 12 in the pond width direction comes into contact with the upward regulating portion 192, and the water surface track portion 11w swings upward. Further swings are suppressed.

In addition, as a measure against vibration of the underwater track section 11l-1 due to earthquake sloshing, a regulating member is installed near the upper corner of the scraping member 12 attached to the underwater track section 11l-1 in the same way as the downstream return rail 24. It may be extended. In this case, the regulating member is fixedly placed in the water.

To summarize the sludge scraping device equipped with the modified regulating member 19 described above,
"In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
A sludge scraping device comprising: a regulating member that comes into contact with a scraping member that slides on the first rail member when the endless chain swings, and restricts the swing of the endless chain. ”
becomes.

According to this sludge scraping device, even if an earthquake occurs, it is possible to reliably prevent the endless chain from coming off the sprocket.

Here, when the endless chain swings, the regulating member comes into contact with an outer peripheral edge of a scraping member that slides on the rail member, thereby regulating the swing of the endless chain. The shape of the outer peripheral edge may be protruding or recessed.

Further, the regulating member is provided with a portion that abuts the edge of the raking member in the pond width direction and a portion that abuts the edge of the raking plate in the vertical direction. That is, it has a lateral direction regulating part that regulates the swinging of the water surface track portion in the pond width direction, and an upward regulating part that regulates the swinging of the water surface track portion upward.

Further, the regulating member is disposed near the upper corner of the raking member that slides on the rail member, and when the endless chain swings, it comes into contact with the upper corner of the raking member, thereby regulating the swinging of the endless chain. It is a thing.

Further, although the scraping member has a rectangular scraping surface, the upper corner may be a rounded portion instead of a corner.

Further, the regulating member is attached to the side wall located at the end in the width direction of the pond via an attaching member. The mounting member only needs to extend from the side wall to the vicinity of the upper corner of the scraper plate on which the rail member slides, and as described above, the mounting member can be shortened.

The rail member extends on the water surface side in the water flow direction, and a scraping plate attached to a water surface track portion of the endless chain that runs on the water surface side is mounted, and the scraping plate slides. The regulating member is disposed near the upper corner of the raking member attached to the water surface orbit portion, and when the water surface orbit portion swings, it comes into contact with the upper corner of the raking member, and the regulating member is disposed near the upper corner of the raking member attached to the water surface orbit portion. This is to control the deflection of the part.

Also, in the previous description,
"In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
A plurality of the raking members are attached at intervals, a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and an upstream track in the water flow direction in which the water flows. An endless chain that runs on a circular track that is connected to a water surface track that extends on the water surface side toward the downstream side but is shorter than the raking track, and a downstream track that connects the water surface track and the raking track;
A scraping member is installed on the scraping track along the scraping track, and is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track, and the scraping member is installed on the scraping track. a sliding first rail member;
a second rail member extending in the water flow direction on the water surface side, on which a scraping member attached to a water surface track portion of the endless chain that runs on the water surface track is placed, and on which the scraping member slides; ,
The scraping member has a regulating member that regulates the swinging of the endless chain,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The sludge scraping device is characterized in that the regulating member has a contact surface that may come into contact with the second rail member from above as the endless chain runs and is inclined downward. ”
explained.

Also,
"In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
A plurality of the raking members are attached at intervals, a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and an upstream track in the water flow direction in which the water flows. An endless chain that runs on a circular track that is connected to a water surface track that extends on the water surface side toward the downstream side but is shorter than the raking track, and a downstream track that connects the water surface track and the raking track;
A scraping member is installed on the scraping track along the scraping track, and is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track, and the scraping member is installed on the scraping track. a sliding first rail member;
a second rail member extending in the water flow direction on the water surface side, on which a scraping member attached to a water surface track portion of the endless chain that runs on the water surface track is placed, and on which the scraping member slides; ,
The scraping member has a regulating member that regulates the swinging of the endless chain,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The first rail member is arranged so that the regulating member of the raking member attached to a portion of the endless chain running on the water surface track side of the downstream track is near an area through which the endless chain runs. A sludge scraping device characterized in that a space is provided in the sludge scraping device. ”
Also explained.

The space may be a space provided by notching or may be a space provided by retreating, and this space allows the water surface track side of the downstream track of the endless chain to The restriction member of the scraping member attached to the traveling portion is prevented from interfering with the first rail member.

The second rail member is configured such that the regulating member of the raking member attached to a portion of the endless chain running on the water surface track side of the upstream track is near an area through which the endless chain runs. A space may be provided between the two. The space referred to here may be a space provided by notching or a space provided by retreating, and this space allows the water surface trajectory on the upstream track of the endless chain to The regulating member of the scraping member attached to the portion running on the side is prevented from interfering with the second rail member.

In addition,
"In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
A raking track in which a plurality of raking members are attached at intervals, a raking track extending along the bottom of the pond, a rising track rising from the raking track toward the water surface, and an inclined track extending from the water surface to the raking track. An endless chain that runs on a connected orbit,
A raking member is installed on the raking track along the raking track and is attached to a submersible track portion of the endless chain that runs on the raking track side of the inclined track, and the raking member slides. a first rail member that moves;
The scraping member has a regulating member that regulates the swinging of the endless chain,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The first rail member is arranged such that the regulating member of the raking member attached to the portion of the endless chain running on the water surface side of the inclined track is located near a region through which the endless chain runs. A sludge scraping device characterized by being provided with a space. ”
It may be.

Also,
"In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
A plurality of the raking members are attached at intervals, a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and an upstream track in the water flow direction in which the water flows. An endless chain that runs on a circular track that is connected to a water surface track that extends on the water surface side toward the downstream side but is shorter than the raking track, and a downstream track that connects the water surface track and the raking track;
A scraping member is installed on the scraping track along the scraping track, and is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track, and the scraping member is installed on the scraping track. a sliding first rail member;
a second rail member extending in the water flow direction on the water surface side, on which a scraping member attached to a water surface track portion of the endless chain that runs on the water surface track is placed, and on which the scraping member slides; ,
The scraping member has a regulating member that regulates the swinging of the endless chain,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The sludge scraping device, wherein the first rail member is installed on the outer side in the width direction of the sedimentation tank than the second rail member. ”
Also explained.

Also,
"In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
A plurality of the raking members are attached at intervals, a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and an upstream track in the water flow direction in which the water flows. An endless chain that runs on a circular track that is connected to a water surface track that extends on the water surface side toward the downstream side but is shorter than the raking track, and a downstream track that connects the water surface track and the raking track;
A scraping member is installed on the scraping track along the scraping track, and is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track, and the scraping member is installed on the scraping track. a sliding first rail member;
a second rail member extending in the water flow direction on the water surface side, on which a scraping member attached to a water surface track portion of the endless chain that runs on the water surface track is placed, and on which the scraping member slides; ,
The scraping member has a regulating member that regulates the swinging of the endless chain,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The distance between the first rail member and the regulating member of the raking member that slides on the first rail member is greater than the distance between the second rail member and the regulating member of the raking member that slides on the second rail member. A sludge scraping device that is characterized by its long length. ”
Also explained.

The scraping member may extend in the width direction of the sedimentation tank, and the first rail member may be installed on both sides of the sedimentation tank in the width direction. Furthermore, the second rail members may also be installed on both sides of the sedimentation basin in the width direction of the basin.

The second rail member has a portion that protrudes toward the side where the regulating member of the scraping member attached to the water surface track portion is provided, whereas the first rail member has a portion that protrudes toward the side where the regulating member is provided. The scraping member attached to the track portion may not have a protruding portion on the side where the regulating member is provided. Furthermore, the first rail member may have a portion that protrudes on the side opposite to the side on which the regulating member of the scraping member attached to the underwater track portion is provided.

Further, the first rail member and the second rail member are rail members having the same shape, but are attached in opposite directions, and the first rail member is more attached to the regulating member than the second rail member. It may be in a mode that does not easily interfere with the

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The regulating member has a contact surface that may come into contact with the first rail member from above when the endless chain runs, and the contact surface thereof is inclined downward;
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The first rail member is arranged so that the regulating member of the raking member attached to a portion of the endless chain running on the water surface track side of the downstream track is near an area through which the endless chain runs. It is characterized by having a space provided therein.

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The regulating member has a contact surface that may come into contact with the first rail member from above when the endless chain runs, and the contact surface thereof is inclined downward;
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The first rail member may be installed on the outer side of the sedimentation tank in the width direction of the settling tank than the second rail member.

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The regulating member has a contact surface that may come into contact with the first rail member from above when the endless chain runs, and the contact surface thereof is inclined downward;
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The distance between the first rail member and the regulating member of the raking member that slides on the first rail member is greater than the distance between the second rail member and the regulating member of the raking member that slides on the second rail member. It is characterized by being longer.

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the endless chain comes into contact with the regulating member from above as the endless chain runs;
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The first rail member is arranged so that the regulating member of the raking member attached to a portion of the endless chain running on the water surface track side of the downstream track is near an area through which the endless chain runs. It is characterized by having a space provided therein.

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the endless chain comes into contact with the regulating member from above as the endless chain runs;
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The first rail member may be installed on the outer side of the sedimentation tank in the width direction of the settling tank than the second rail member.

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the endless chain comes into contact with the regulating member from above as the endless chain runs;
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The distance between the first rail member and the regulating member of the raking member that slides on the first rail member is greater than the distance between the second rail member and the regulating member of the raking member that slides on the second rail member. It is characterized by being longer.

Also,
In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The regulating member is characterized in that a contact surface that may come into contact with the first rail member from above as the endless chain runs is inclined downward.

The first rail member may be installed on the water surface side, or may be installed on the pond bottom side.

The contact surface may be a slope that gradually slopes downward as it goes in the width direction of the sedimentation tank.

The raking member may extend in the width direction of the sedimentation tank, and the first rail member may be installed on both sides of the sedimentation tank in the width direction.

According to the sludge scraping device, when the regulating member contacts the first rail member from above, the regulating member smoothly moves downward following the slope of the contact surface as the endless chain runs. This can prevent the endless chain from running erratically.

Also,
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The contact surface may also come into contact with the second rail member from above as the endless chain runs.

In addition, the said 2nd rail member may be installed in each of the both sides of the pond width direction of the said sedimentation basin (the same applies hereafter).

In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction in which the water flows, on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The scraping member has a regulating member that comes into contact with the first rail member when the endless chain swings and regulates the swing of the endless chain,
The first rail member is characterized in that it is provided with a guide surface that guides the regulating member downward when the endless chain comes into contact with the regulating member from above as the endless chain runs.

The first rail member may be installed on the water surface side, or may be installed on the pond bottom side.

The guide surface may be a slope that gradually slopes downward as it goes in the width direction of the sedimentation tank.

The raking member may extend in the width direction of the sedimentation tank, and the first rail member may be installed on both sides of the sedimentation tank in the width direction.

According to the sludge scraping device, when the regulating member contacts the first rail member from above, the regulating member is smoothly guided downward by the guide surface in accordance with the running of the endless chain, It is possible to prevent the running of the endless chain from becoming disordered.

The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The second rail member may also be provided with a guide surface that guides the regulating member downward when the endless chain comes into contact with the regulating member from above as the endless chain runs.

The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The first rail member is arranged so that the regulating member of the raking member attached to a portion of the endless chain running on the water surface track side of the downstream track is near an area through which the endless chain runs. A space may be provided between the two.

The space may be a space provided by notching or may be a space provided by retreating, and this space allows the water surface track side of the downstream track of the endless chain to The restriction member of the scraping member attached to the traveling portion is prevented from interfering with the first rail member.

Further, the present invention may include a second rail member installed on the water surface side, on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides. In this case, the second rail member is configured such that the regulating member of the raking member attached to a portion of the endless chain running on the water surface track side of the upstream track passes through as the endless chain runs. A space may be provided in the vicinity of the area. The space referred to here may be a space provided by notching or a space provided by retreating, and this space allows the water surface trajectory on the upstream track of the endless chain to The regulating member of the scraping member attached to the portion running on the side is prevented from interfering with the second rail member.

Also,
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The first rail member may be installed on the outer side in the width direction of the sedimentation tank than the second rail member.

Also,
The endless chain includes a raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and extending on the water surface side from the upstream side to the downstream side in the water flow direction. The water surface orbit, which is shorter than the raking orbit, is connected to the downstream track connecting the water surface orbit and the raking orbit.
The first rail member is installed on the scraping track along the scraping track, and the scraping member is attached to a submersible track portion of the endless chain that runs on the scraping track side of the downstream track. The raking member is placed and slides,
further comprising a second rail member installed on the water surface side, on which a raking member attached to the water surface track portion of the endless chain that runs on the water surface track is placed, and on which the raking member slides;
The regulating member of the scraping member attached to the underwater track portion comes into contact with the first rail member when the underwater track portion swings, and regulates the swing of the underwater track portion;
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The distance between the first rail member and the regulating member of the raking member that slides on the first rail member is greater than the distance between the second rail member and the regulating member of the raking member that slides on the second rail member. It may be a longer mode.

The second rail member has a portion that protrudes toward the side where the regulating member of the scraping member attached to the water surface track portion is provided, whereas the first rail member has a portion that protrudes toward the side where the regulating member is provided. The scraping member attached to the track portion may not have a protruding portion on the side where the regulating member is provided. Furthermore, the first rail member may have a portion that protrudes on the side opposite to the side on which the regulating member of the scraping member attached to the underwater track portion is provided.

The first rail member and the second rail member are rail members of the same shape, but are installed in opposite directions, and the first rail member interferes with the regulating member more than the second rail member. It may be in a manner that makes it difficult to do so.

Also,
The regulating member may have a lateral regulating part that regulates swinging of the endless chain in the width direction of the settling basin,
The regulating member may include an upward regulating portion that regulates upward swinging of the endless chain.

A plurality of embodiments and modifications have been described above, but any embodiment or modification is a high-quality sludge scraping device.

Note that even if the constituent features are included only in the descriptions of each of the embodiments and modified examples described above, the constituent features may be applied to other embodiments and modified examples.

1 Sedimentation basin 1d Pond bottom 10 Sludge scraping device 11 Endless chain 12 Scraping member 123 Regulating member 1233 Projecting part 1233s Contact surface 1233t Projecting tip 16 Sprocket 24 Downstream return rail 240 Sliding part 242s Guide surface 25 Upstream return rail 250 Sliding Contact part Tw Water surface orbit Tl Downstream orbit Tk Scraping orbit Tu Upstream orbit 11w Water surface orbit section 11l Downstream orbit section 11l-1 Underwater orbit section 11l-2 Slack section 11k Scraping orbit section 11u Upstream orbit section

Claims (2)

In a sludge scraping device installed in a settling tank where sludge contained in sludge water settles to the bottom of the pond while water containing sludge flows,
a raking member for raking sludge settled at the bottom of the pond;
an endless chain in which a plurality of the raking members are attached at intervals, and the raking members circulate between the pond bottom side and the water surface side by running;
a rail member extending in the water flow direction in which the water flows, and having a sliding contact portion on which the scraping member is placed and on which the scraping member slides when the endless chain runs;
The raking member is provided with a protrusion that protrudes outward in the width direction of the sedimentation tank, and has a regulating member that comes into contact with the rail member when the endless chain swings and regulates the swing of the endless chain. It is a thing,
The rail member has a raking member attached to a water surface track portion extending on the water surface side from the upstream side to the downstream side in the water flow direction of the endless chain, and the raking member slides on the rail member. It includes a second rail member having two sliding contact parts,
The regulating member of the scraping member attached to the water surface track portion contacts the second rail member when the water surface track portion swings, and regulates the swing of the water surface track portion;
The second rail member has a second space provided by retreating from the inside toward the outside in the pond width direction near the area through which the protrusion passes when the endless chain runs. ,
The sludge scraping device is characterized in that the protruding portion enters from above the second rail member to below the second sliding contact portion using the second space. The rail member includes a first rail having a first sliding contact portion on which a scraping member attached to a slack portion of the endless chain that is curved downward and loosens is placed, and on which the scraping member slides. It further includes a member,
The regulating member of the scraping member attached to the slack portion comes into contact with the first rail member when the slack portion swings, and regulates the swing of the slack portion;
The first rail member has a first space provided by retreating from the inside toward the outside in the pond width direction near a region through which the protrusion passes when the endless chain runs. ,
The sludge scraping device according to claim 1, wherein the protruding portion enters from above the first rail member to below the first sliding contact portion using the first space. .

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