JP7144036B2 - Sludge collector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles on the bottom of the pond while water containing sludge flows.

As a sludge scraping device, there is known one having an endless chain having a scraping member extending in the width direction of the pond perpendicular to the water flow direction in which sludge-laden water flows. In this sludge scraping device, a part of the endless chain is wound around the driving wheel, and the endless chain travels by receiving the driving force from the driving wheel, and the scraping member is operated on the bottom side and the water surface side of the sedimentation tank. It is circulating. A part of the endless chain is wound around the sedimentation tank, and a driven wheel that rotates following the running of the endless chain is also arranged. The raking member rakes up sludge settled on the bottom of the sedimentation tank when traveling on the bottom of the sedimentation tank, and rakes up scum floating on the water surface when traveling on the water surface side. Further, the sedimentation tank is provided with a rail member extending in the water flow direction and having a sliding contact portion on which a raking member is placed when the endless chain runs and the raking member slides.

By the way, in a sedimentation tank in which a sludge scraping device is installed, an endless chain may come off a rotating wheel such as a driving wheel or a driven wheel due to the influence of an earthquake. The reason why the endless chain is detached from the rotating ring is not the direct effect of the shaking caused by the earthquake, but rather the effect of sloshing, which causes the water in the sedimentation basin to undulate greatly due to the earthquake. When sloshing occurs, the endless chain swings greatly, and the force of the swing is transmitted to the portion of the endless chain that is wound around the rotating wheel, which may cause the endless chain to come off the rotating wheel.

As a countermeasure against this earthquake, it has been proposed to provide a regulating member on the raking member (see, for example, Patent Document 1). The regulating member described in Patent Document 1 abuts against the rail member when the endless chain sways, thereby regulating the swaying of the endless chain. When the endless chain runs, the regulating member enters from one end of the rail member below the sliding contact portion of the rail member, leaves a gap from the rail member, and passes through the rail member along with the running of the endless chain.

Japanese Patent Application Laid-Open No. 2011-5400

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

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a sludge collecting device capable of suppressing disturbance of running of an endless chain even when a regulating member comes into contact with a rail member.

The first sludge scraping device of the present invention for solving the above object is
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a contact surface inclined downward, which may come into contact with the first rail member from above when the endless chain travels,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The first rail member is in the vicinity of a region through which the regulating member of the raking member attached to the portion of the endless chain that runs on the water surface track side of the downstream track passes as the endless chain runs. and a space is provided.
The second sludge scraping device of the present invention for solving the above object is
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a contact surface inclined downward, which may come into contact with the first rail member from above when the endless chain travels,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
A said 1st rail member is installed in the pond width direction outer side of the said sedimentation tank rather than a said 2nd rail member, It is characterized by the above-mentioned.
The third sludge scraping device of the present invention for solving the above object is
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a contact surface inclined downward, which may come into contact with the first rail member from above when the endless chain travels,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The gap between the first rail member and the regulating member of the raking member sliding on the first rail member is larger than the gap between the second rail member and the regulating member of the raking member sliding on the second rail member. characterized by being longer.
The fourth sludge scraping device of the present invention for solving the above object is
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The first rail member is in the vicinity of a region through which the regulating member of the raking member attached to the portion of the endless chain that runs on the water surface track side of the downstream track passes as the endless chain runs. and a space is provided.
The fifth sludge scraping device of the present invention for solving the above object is
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
A said 1st rail member is installed in the pond width direction outer side of the said sedimentation tank rather than a said 2nd rail member, It is characterized by the above-mentioned.
The sixth sludge scraping device of the present invention for solving the above object is
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The gap between the first rail member and the regulating member of the raking member sliding on the first rail member is larger than the gap between the second rail member and the regulating member of the raking member sliding on the second rail member. characterized by being longer.
again,
In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a downwardly sloping contact surface that may come into contact with the first rail member from above as the endless chain travels.

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 an inclined surface that is gradually inclined downward 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 members may be installed on both sides of the sedimentation tank in the width direction.

According to the sludge raking device, when the regulating member comes into contact with the first rail member from above, the regulating member moves downward following the inclination of the contact surface as the endless chain travels. It can move smoothly and prevent the running of the endless chain from being disturbed.

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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The contact surface may contact the second rail member from above as the endless chain travels.

The second rail members may be installed on both sides of the sedimentation tank in the width direction (hereinafter the same).

In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels.

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 an inclined surface that is gradually inclined downward toward the width direction of the sedimentation tank.

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

According to the sludge scraping device, when the regulating member comes into contact with 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, Disturbance of running of the endless chain can be suppressed.

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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the scraping track and a downstream track that connects the water surface track and the scraping track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration 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 regulating member comes into contact with the regulating member from above as the endless chain travels.

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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the scraping track and a downstream track that connects the water surface track and the scraping track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The first rail member is in the vicinity of a region through which the regulating member of the raking member attached to the portion of the endless chain that runs on the water surface track side of the downstream track passes as the endless chain runs. A space may be provided in the space.

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 move. The restricting member of the raking member attached to the traveling portion is prevented from interfering with the first rail member.

Further, the embodiment includes a second rail member which is installed on the water surface side and on which a raking member attached to the water surface track portion of the endless chain running on the water surface track is mounted and on which the raking member slides. In the second rail member, the regulating member of the scraping member attached to the part of the endless chain that runs on the water surface track side of the upstream track is passed by the endless chain running. A space may be provided in the vicinity of the region where the light is applied. The space referred to here may be a space provided by notching or a space provided by retreating. The restricting member of the raking member attached to the portion running on the side is suppressed 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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The said 1st rail member may be installed in the pond width direction outer side of the said sedimentation tank rather than the said 2nd 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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The gap between the first rail member and the regulating member of the raking member sliding on the first rail member is larger than the gap between the second rail member and the regulating member of the raking member sliding on the second rail member. It may be in a longer mode.

The second rail member has a portion of the raking member attached to the water surface track portion that protrudes toward the side where the regulation member is provided, while the first rail member The raking member attached to the track portion may not have a portion projecting to the side where the regulating member is provided. Further, the first rail member may have a portion of the raking member attached to the underwater track portion that protrudes on the side opposite to the side on which the regulating member is provided.

The first rail member and the second rail member are rail members having the same shape, but are mounted in opposite directions, and the first rail member interferes with the regulating member more than the second rail member. It may be a mode in which it is difficult to

Also ,
The restricting member may have a lateral restricting portion that restricts the endless chain from swinging in the width direction of the sedimentation tank,
The restricting member may have an upward restricting portion that restricts the endless chain from swinging upward.

According to the sludge collecting device of the present invention, it is possible to prevent the running of the endless chain from being disturbed even when the regulating member comes into contact with the rail member.

BRIEF DESCRIPTION OF THE DRAWINGS It is a sectional side view of the sedimentation tank in which the sludge scraping apparatus which is one Embodiment of this invention was installed. It is the elements on larger scale which expanded the A section of FIG. (a) is a cross-sectional view taken along the line BB in FIG. 2, and (b) is a diagram showing the upstream return rail and the restricting member when sloshing occurs due to an earthquake and the water surface track portion sways in the width direction of the pond. and (c) is a diagram showing a state in which the projecting portion of the regulating member comes into contact with the sliding contact portion of the upstream return rail from above. It is the figure which showed typically a mode that the downstream side of the water flow direction in the water of the sedimentation tank was seen from the downward direction of the scum removal apparatus shown in FIG. 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 upper direction. It is a figure when the return rail of 2nd Embodiment is seen from upper direction. The projection of the regulating member approaches the upstream end portion of the downstream return rail of the second embodiment from obliquely above and enters below the sliding contact portion of the downstream return rail in stages. is a diagram shown in FIG. It is a figure which shows the modification of 2nd Embodiment. It is a figure which shows the relationship between the downstream return rail and the protrusion part of a control member in the sludge raking device of 3rd Embodiment. FIG. 12 is a diagram showing the relationship between the downstream return rail 24 and the projecting portion 1233 of the regulating member 123 in the sludge raking device of the fourth embodiment; It is a figure which shows the modification of a control member.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side cross-sectional view of a sedimentation tank in which a sludge scraping device, which is one embodiment of the present invention, is installed.

The sedimentation tank 1 shown in FIG. 1 is a substantially rectangular tank 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 and rainwater from one end side in the longitudinal direction (left side in FIG. 1), settles the sludge contained in the received water on the bottom part 1d of the tank, and settles on the other end side. (on the right side in FIG. 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. Also, in FIG. 1, the direction orthogonal to the paper surface is called the pond width direction. In addition, FIG. 1 is the figure which looked at the sedimentation tank in the pond width direction.

As shown in FIG. 1, the sedimentation tank 1 is provided with a sludge raking device 10, a scum removing device 30, a drainage gutter 40, and a sludge pit 50 of the present embodiment. A drain trough 40 is provided in the downstream portion of the sedimentation tank 1 . A sludge pit 50 is provided in the upstream part of the sedimentation tank 1 .

The sludge raking device 10 of this embodiment includes an endless chain 11 . The endless chains 11 are provided at both ends of the sedimentation tank 1 in the width direction thereof. Each of the pair of endless chains 11 provided at both ends in the width direction of the pond has 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 sedimentation tank 1. A rising upstream trajectory Tu, a water surface trajectory Tw that extends from the upstream side toward the downstream side in the water flow direction but is shorter than the scraping trajectory Tk, and a water surface trajectory Tw and the scraping trajectory Tk that are located on the downstream side of the sedimentation tank 1. It is a ring-shaped chain that travels on a circular track that is connected to a downstream track Tl that connects with .

A plurality of raking members 12 extending in the width direction of the pond are laid over the pair of endless chains 11 . The scraping member 12 circulates between the pond bottom 1d side and the water surface WL side as the endless chain 11 travels on the circuit track. In FIG. 1, the endless chain 11 is shown as a circular track.

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

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 drive sprocket 14 . A drive shaft 141 is fixed to the central portion of the drive sprocket 14 . The drive shaft 141 extends in the width direction of the pond and is rotatably supported by bearings (not shown) fixed to the pair of side walls 1c. A 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 the present embodiment corresponds to an example of a drive wheel that transmits a driving force to the endless chain 11 to run the endless chain 11 .

The motor 21 is a motor that can rotate in both clockwise and counterclockwise directions in FIG. The motor 21 is normally rotated clockwise in FIG. As the motor 21 rotates clockwise, the drive sprocket 14 rotates clockwise, causing the endless chain 11 to run clockwise. Hereinafter, clockwise rotation of the drive sprocket 14 in FIG. 1 will be referred to as normal rotation driving, and clockwise running of the endless chain 11 in FIG. 1 will be referred to as normal rotation driving. When the drive sprocket 14 rotates forward, the water surface track portion 11w of the endless chain 11 on the water surface track Tw travels from the upstream side toward the downstream side.

Also, the motor 21 has a torque limiter function. For example, if foreign matter gets caught in the raking member 12 attached to the endless chain 11 running on the bottom 1d of the pond and an excessive load is applied to the motor 21, the torque limiter function is activated to temporarily stop the motor 21. . Then, the motor 21 rotates in the reverse direction (rotates counterclockwise in FIG. 1) for a short period of time in order to release the foreign matter. With the reverse rotation of the motor 21, the drive sprocket 14 rotates counterclockwise in FIG. 1, causing the endless chain 11 to travel counterclockwise (so-called reverse operation). Hereinafter, the counterclockwise rotation of the drive sprocket 14 in FIG. 1 is referred to as reverse drive, and the counterclockwise travel of the endless chain 11 in FIG. 1 is referred to as reverse rotation. When the drive sprocket 14 reversely drives, the water surface track portion 11w travels from the downstream side toward the upstream side.

Other sprockets 15 to 17 are driven sprockets that rotate following the running of the endless chain 11 . Fixed shafts 151, 161 and 171 pass through the central portions of the sprockets 15-17. Each fixed shaft 151, 161, 171 is fixedly arranged so as not to be rotatable around the shaft. All of the sprockets 15-17 are rotatable about their fixed shafts 151, 161 and 171. As shown in FIG. Each of the sprockets 14 to 17 is a rotating wheel that rotates around the drive shaft 141 and the fixed shafts 151, 161, 171 as rotation axes. In the following description, the sprocket 15 arranged on the downstream side of the water surface trajectory Tw will be referred to as the 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 endless chain 11 at equal or substantially equal intervals in the circulation direction. A bottom rail 23 extending in the longitudinal direction of the sedimentation tank 1 along the bottom part 1d of the sedimentation tank 1 is fixed to the bottom part 1d of the sedimentation tank 1 . In the pond bottom 1d, the raking member 12 travels along the raking track Tk by moving while being guided by the pond bottom rail 23, and rakes up the sludge that has settled on the pond bottom 1d.

When the endless chain 11 rotates normally, the raking member 12 positioned on the raking track Tk moves along the pond bottom 1d from the downstream side toward the upstream side. The sludge deposited 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 sedimentation tank 1 by a sludge pump (not shown).

Scum floats on the water surface WL of the sedimentation tank 1 . When the endless chain 11 rotates normally, the raking member 12 positioned on the water surface track Tw moves along the water surface WL from the upstream side toward the downstream side. The scum floating on the water surface WL is collected toward the scum removing device 30 on the downstream side by the collecting member 12 that moves on the water surface track Tw. The scum collected to the scum remover 30 side is discharged to the outside of the sedimentation tank 1 by the scum remover 30 together with the water in the sedimentation tank 1 . In addition, the water in the sedimentation tank 1 from which the scum and sludge have been removed passes under the scum removal device and flows into the drainage gutter 40, flows from the drainage gutter 40 into a drainage channel (not shown), and is discharged to the outside of the sedimentation basin 1. be done.

The endless chain 11 is installed in a state with an appropriate margin in the circulation direction from the beginning of installation in the sedimentation tank 1 in order to prevent the driving force for running the endless chain 11 from increasing. The endless chain 11 is slackened in an amount corresponding to the allowance. In addition, the endless chain 11 tends to stretch for a while after the start of running due to conforming or creeping of the endless chain 11, and as a result, slack tends to increase gradually from the time of installation. After running the endless chain 11 to some extent, the elongation hardly occurs.

When the endless chain 11 runs, a running load generated by scraping sludge by the scraping member 12 is applied to the scraping track portion 11k of the endless chain 11 located on the scraping track Tk. When the endless chain 11 rotates normally, tension corresponding to the running load is generated in the scraping track portion 11k of the endless chain 11 and the upstream track portion 11u located on the upstream track Tu. . On the other hand, the water surface track portion 11w and the downstream track portion 11l located on the downstream track Tl of the endless chain 11 are loosened. FIG. 1 shows a state in which the water surface track portion 11w and the downstream track portion 11l are loosened. As shown in FIG. 1, the downstream trajectory Tl is longer than the water surface trajectory Tw. The slack in the downstream track portion 11l is greater than the slack in the portion 11w.

Next, a return rail corresponding to an example of a rail member will be described. The sludge collecting 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 extending in the longitudinal direction of the sedimentation tank 1 and substantially parallel to the bottom 1d of the sedimentation tank 1 is fixed at a predetermined height from the bottom 1d of the sedimentation tank 1 downstream of the sedimentation tank 1. . The 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 traveling in the forward direction, the scraping member 12 attached to the endless chain 11 is attached to the downstream return rail 24 on the scraping track Tk side (also referred to as the downstream side) of the greatly loosened downstream track Tl. Move guided. That is, the downstream return rail 24 is installed on the rake-up track Tk along the rake-up track Tk, and is attached to the underwater track portion 11l-1 of the endless chain 11 that runs on the rake-up track Tk side of the downstream track Tl. A raking member 12 is placed on the rail, and the raking member 12 slides, which corresponds to an example of a first rail member. As shown in FIG. 1, the trajectory on the gathering trajectory Tk side in the downstream trajectory Tl is a horizontal trajectory.

Furthermore, an upstream return rail 25 extending in the water flow direction along the water surface WL is fixed upstream of the sedimentation tank 1 and near the water surface WL. That is, the upstream return rail 25 is installed on the water surface side, and the scraping member 12 attached to the water surface track portion 11w of the endless chain 11 is placed thereon, and the scraping member 12 slides. It corresponds to an example of a two-rail member. The 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 track Tw.

FIG. 2 is a partially enlarged view of the A portion of FIG. 1 . In FIG. 2, the endless chain 11 is indicated by a dashed line except for a part.

The endless chain 11 is a metal chain in which a plurality of link members 110 are connected. A chain made of resin may be used as the endless chain 11 . Each link member 110 is connected by a connecting pin (not shown). In this embodiment, link members 110 provided with stays 113 are 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 raking member 12 . The stay 113 and the raking member 12 shown at the left end of FIG. 2 are coupled with screws (not shown). Although two more raking members 12 are shown in FIG. 2, the link member connecting the two raking members 12 is omitted from the illustration, and the stay is also omitted from the illustration.

The raking member 12 has 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 section extending in the width direction of the pond. A raking surface 121c positioned 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. The flight plate 121 shown in FIG. 2 also has a projecting edge portion 121d projecting from the bent 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. It may extend from a position on the intermediate sprocket 15 side, or it may extend from a position on the upstream wall 1a (see FIG. 1) side from directly above it. Further, it may extend to a position closer to the drive sprocket 14 than directly above the center of the intermediate sprocket 15, or it may extend to a position closer to the downstream wall 1b (see FIG. 1) than directly above the middle sprocket 15. can be anything.

The upstream return rail 25 is composed of a sliding contact portion 250 and a mounting portion 251 on the lower side.

FIG. 3(a) is a cross-sectional view taken along the line BB in FIG. 3(a) is a cross-sectional view taken along a vertical line passing through the center of the drive sprocket 14, and the lateral direction of the drawing corresponds to the width direction of the sedimentation tank 1. FIG. 3A, the drive chain 211 (see FIG. 1) that transmits the torque to the drive sprocket 14 is omitted.

As shown in FIG. 3A, the link member 110 is composed of 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 connecting the pair of left and right link plates 111, 111. there is

The raking member 12 shown in FIG. 3A is the raking member 12 attached to the water surface track portion 11w shown in FIGS. A raking shoe 124 is provided on the upper part which is the side. When the link member 110 to which the raking member 12 shown in FIG. 1 slides on the bottom rail 23 shown in FIG.

In addition, a return shoe 122 and a regulating member 123 are provided at the bottom of the raking member 12 shown in FIG.

The lower end portion of the return shoe 122 shown in FIG. 3A protrudes downward from 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 raking member 12 shown in FIG. 3A is attached travels on the water surface track Tw, the return shoe 122 comes into sliding contact with the upstream return rail 25 . The edge of the return shoe 122 on the outside in the width direction of the pond coincides with the edge of the flight plate 121 in the vertical direction. On the other hand, a protrusion 1221 protruding downward is provided at the lower corner portion of the inner side of the return shoe 122 in the width direction of the pond. That is, the projection 1221 projects further downward than the lower end portion of the return shoe 122 that projects downward beyond the flight plate 121 .

The restricting member 123 has a base portion 1231 , an arm portion 1232 and a projecting portion 1233 . The base portion 1231 of the regulating member 123 is bolted to the raking 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 inner side of the base portion 1231 in the width direction thereof. The protruding portion 1233 is provided at the tip of the arm portion 1232 and is bent 90 degrees from the arm portion 1232 to protrude outward in the width direction of the pond. The shape formed by the arm portion 1232 and the projecting portion 1233 is hook-shaped.

3A shows the downstream end face of the upstream return rail 25. 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 screws (not shown). A sliding contact portion 250 of the upstream return rail 25 protrudes inward in the pond width direction. In other words, the restricting member 123 protrudes so as to face the protruding portion 1233 protruding outward in the width direction of the pond while being displaced in the vertical direction. More specifically, the sliding contact portion 250 of the upstream return rail 25 and the projecting portion 1233 of the regulating member 123 shown in FIG. 3(a) are vertically spaced apart (for example, 10 mm). Moreover, the projecting direction tip (width direction tip) 2501 of the sliding contact portion 250 and the projecting direction tip 1233t of the projecting portion 1233 are separated in the pond width direction (for example, greater than 0 mm and 25 mm or less).

Furthermore, the protruding end 2501 of the sliding contact portion 250 of the upstream return rail 25 faces the protrusion 1221 of the return shoe 122 with a gap in the width direction thereof aligned with the vertical position. When the raking member 12 is displaced in the pond width direction, the projection 1221 of the return shoe 122 abuts on the protruding end 2501 of the sliding contact portion 250 to prevent the raking member 12 from further displacing in the pond width direction. Note that the raking shoe 124 described above is also provided with a projection 1241 that prevents the raking member 12 from shifting in the pond width direction by abutting against the pond bottom rail 23 .

FIG. 3B is a diagram showing the upstream return rail 25 and the restricting member 123 when sloshing due to an earthquake occurs and the water surface track portion 11w sways in the width direction of the pond.

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

Further, the protruding portion 1233 further protrudes outward in the pond width direction, and before the root portion of the protruding portion 1233 contacts the protruding direction leading end 2501 of the sliding contact portion 250, the protruding direction leading end 1233t of the protruding portion 1233 contacts the mounting portion 251. The root portion of the sliding contact portion 250 may be in contact with the contact. Furthermore, if the arm portion 1232 further extends downward, the projecting direction tip 1233 t of the projecting portion 1233 abuts on the mounting portion 251 .

FIG. 3(c) is a view showing a state in which the projecting portion 1233 of the regulating member 123 comes into contact with the sliding contact portion 250 of the upstream return rail 25 from above.

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. As shown in FIG. 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 obliquely above, and the projecting portion 1233 of the restricting 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. In some cases, the sliding contact portion 250 of the upstream return rail 25 is touched from above.

Here, in the present embodiment, the surface connecting the projecting direction tip 1233t and the lower end of the hook-shaped projecting portion 1233 is gradually inclined downward from the projecting direction tip 1233t toward the lower end. 3(c), the downwardly sloping surface connecting the projecting direction tip 1233t of the hook-shaped projecting portion 1233 and the lower end may come into contact with the sliding contact portion 250 of the upstream return rail 25. Therefore, it is called a contact surface 1233s.

A contact surface 1233s shown in FIG. 3(c) is in contact with a projecting direction tip 2501 of the sliding contact portion 250 of the upstream return rail 25. As shown in FIG. 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 obliquely above, and is essentially the projecting portion of the restricting member 123. 1233 travels on a downward trajectory to enter below the sliding contact portion 250 of the upstream return rail 25 . In addition, the projecting portion 1233 provided with the contact surface 1233s in contact with the projecting direction tip 2501 is directed downward following the inclination of the contact surface 1233s as the endless chain 11 runs. As a result, the regulating member 123 provided with the contact surface 1233s in contact with the projecting direction tip 2501 smoothly moves downward, thereby preventing the endless chain 11 from being disturbed.

FIG. 4 is a diagram schematically showing the downstream side in the water flow direction of the sedimentation tank 1 viewed from below the scum removing device 30 shown in FIG. The endless chain 11 is formed by connecting a plurality of link members 110 (see FIG. 2), which is indicated by a single thick black line in FIG.

In FIG. 4, the front side of the paper surface is the upstream side in the water flow direction, and the back side of the paper surface is the upstream side in the water flow direction. Moreover, the horizontal direction is the width direction of the sedimentation tank 1 . In FIG. 4, the downstream track Tl of the endless chain 11 extends toward the sprocket 16 shown in gray on the back side of the page, and the raking track Tk returns from the back side of the page to the front side of the page. there is

FIG. 4 shows the raking member 12 attached to the endless chain 11 with the stay 113 interposed therebetween. FIG. 4 shows five raking members 12 . A return shoe 122 and a regulating member 123 are provided at both ends of each raking member 12 . In the raking member 12 attached to the downstream side track portion 11l of the endless chain 11 shown in FIG. extended. In addition, bent surfaces 121a and 121b of the flight plate 121 protrude toward the front side.

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

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 of 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 section, 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 screws (not shown). Further, similarly to the upstream return rail 25, the sliding contact portion 240 of the downstream return rail 24 also protrudes inward in the pond width direction. In other words, the regulation member 123 of the raking member 12 of the underwater track portion 11l-1 protrudes so as to face the protruding portion 1233 protruding outward in the width direction of the pond while being displaced 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 vertically spaced apart (for example, 10 mm). Moreover, the projecting direction tip (width direction tip) 2401 of the sliding contact portion 240 and the projecting direction tip of the projecting portion 1233 are separated in the pond width direction (for example, greater than 0 mm and 25 mm or less).

Furthermore, the protruding end 2401 of the sliding contact portion 240 of the downstream return rail 24 is also aligned with the protrusion 1221 (see FIG. 3A) of the return shoe 122 in the vertical direction, and is spaced in the width direction of the pond. facing each other. When the raking member 12 is displaced in the width direction of the pond, the projection 1221 (see FIG. 3A) of the return shoe 122 abuts on the protruding end 2401 of the sliding contact portion 240, and the raking member 12 shifts in the width direction of the pond. Further deviation is prevented.

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 loose. Hereinafter, the portion of the endless chain 11 that runs on the water surface track Tw side of the downstream track Tl is referred to as a slack portion 11l-2. This slack portion 11l-2 approaches the downstream return rail 24 obliquely from above. run on a track that leads to In addition to this, similarly to the case of the upstream return rail 25 described with reference to FIG. may come into contact with The projecting portion 1233 provided with the contact surface 1233s that contacts the projecting direction tip 2401 of the downstream return rail 24 is also directed downward following the inclination of the contact surface 1233s as the endless chain 11 travels. As a result, the regulating member 123 provided with the contact surface 1233s in contact with the protruding end 2401 of the downstream return rail 24 smoothly moves downward, and the endless chain 11 travels on the downstream return rail 24 as well. Disruption can be suppressed. 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 projecting portion 1233 of the regulating member 123 is located above the upstream return rail 25. The effect of the downwardly inclined contact surface 1233s of the projecting portion 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 so far. In the following description, components having the same names as the components described so far are given the same reference numerals as those used so far. In addition, in FIG. 5, the horizontal direction of the drawing is the width direction of the sedimentation tank 1, the right side of the drawing is the inner side in the width direction, and the left side is the outer side in the width direction.

In FIG. 5(a), the shape of the downstream return rail 24 is different from the shape of the downstream return rail described so far. The downstream return rail 24 shown in FIG. 5A is provided with a guide portion 242 in addition to the sliding contact portion 240 and the mounting portion 241 . The sliding contact portion 240 shown in FIG. 5A protrudes outward in the width direction of the pond. The guide portion 242 is provided with a guide surface 242s that slopes downward toward the inside in the width direction of the pond. 242 s of this guide surface inclines from the place which fell one step from the sliding contact part 240. As shown in FIG. On the other hand, the projecting portion 1233 of the restricting member 123 shown in FIG. 5A is not provided with a downwardly inclined surface.

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

As the endless chain 11 runs, the projecting portion 1233 shown in FIG. 5A is guided by the guide surface 242s of the guide portion 242 of the downstream return rail 24, and the restricting member 123 smoothly moves downward. 5A, the lower end of the return shoe 122 is placed on the sliding contact portion 240 of the downstream return rail 24. As shown in FIG. 5(a) is provided with a protrusion 1221 protruding downward, similar to the protrusion 1221 shown in FIG. It faces the projecting direction tip 2401 of the sliding contact portion 240 projecting outward in the width direction.

Also in FIG. 5B, the shape of the downstream return rail 24 is changed. The downstream return rail 24 shown in FIG. The inclination is inclined from the height position of the sliding contact portion 240 . Further, a downwardly inclined contact surface 1233s is provided on the projecting portion 1233 of the restricting member 123 shown in FIG. 5(b). The protrusion 1233 shown in FIG. 5(b) is one size smaller than the protrusion 1233 shown in FIG. 3(a), but has the same basic configuration.

5B, the contact surface 1233s of the projecting portion 1233 is in surface contact with the guide surface 242s of the downstream return rail 24. In FIG. That is, the inclination angle of the contact surface 1233s of the projecting portion 1233 and the inclination angle 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. 5B smoothly moves downward due to the inclination of the contact surface 1233s of the projecting portion 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. As shown in FIG. A projection 1221 for preventing slippage is also provided at the bottom corner of the outer side in the width direction of the return shoe 122 shown in FIG. 5B. facing.

In the modification described above, the shape of the downstream return rail 24 was different, but the shape of the upstream return rail 25 may be the same as the shape of the downstream return rail 24 described here, or the shape of the upstream return rail 24 may be the same. 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 raking 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, the components having the same names as the components described in the description of the sludge scraping device of the first embodiment have the same reference numerals as those used in the description of the sludge scraping device of the first embodiment. are assigned the same reference numerals.

6 and 7 are top views of the return rail of the second embodiment. That is, it is a plan view of each of the upstream return rail 25 and the downstream return rail. In both FIG. 6 and FIG. 7, the horizontal direction of the drawing is the pond width direction.

6(a) and 6(b) as well as in FIGS. 7(a) and 7(b), a pair of upstream return rails 25 are shown close together on the upper side, and a pair of downstream rails 25 are shown on the lower side. A side return rail 24 is also shown in close proximity. As described 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 are originally installed apart from each other. In FIG. 7, they are shown close together due to space limitations. Also, in both the upstream return rail 25 and the downstream return rail 24, the intermediate portion is omitted, the upper side is the upstream side, and the lower side is the downstream side.

Furthermore, both 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, the mounting portions 251 and 241 are on the outside in the width direction of the pond, and the sliding contact portions 250 and 240 protrude inward in the width direction of the pond.

Both the upstream return rail 25 and the downstream return rail 24 shown in FIG. Three downstream rail members 25-3 and 24-3 are connected (for example, welded or bolted). Each of these three rail members (25-1, 25-2, 25-3, 24-1, 24-2, 24-3) has an upside-down L-shaped cross-section, The portions 251 and 241 are on the outside in the width direction of the pond, and the sliding contact portions 250 and 240 protrude toward the inside in the width direction of the pond.

On the other hand, each of the upstream return rail 25 and the downstream return rail 24 shown in FIG. 7B is formed by bending a single rail member. That is, the mounting portions 251 and 241 are positioned at the center, the sliding contact portions 250 and 240 at the upstream end and the downstream end are bent outward in the width direction of the pond, and the intermediate portion is the sliding contact portion 250. , 240 are bent inward in the width direction of the pond. As with the upstream return rail 25 and the downstream return rail 24 shown in FIG. 7(a), it may be constructed by connecting three rail members. That is, an upstream rail member in which the sliding contact portions 250 and 240 are bent outward in the pond width direction, an intermediate rail member in which the sliding contact portions 250 and 240 are bent inward in the pond width direction, and a sliding contact portion 250 and 240 may connect downstream rail members bent outward in the width direction of the pond.

In both the downstream return rail 24 and the upstream return rail 25 in the first embodiment, the sliding contact portions 240 and 250 are positioned (upstream end, intermediate portion, downstream end). It is the same regardless. On the other hand, in the downstream return rail 24 and the upstream return rail 25 shown in FIGS. 6(a) and 6(b), notches or Retreat space is provided and differs depending on the location.

That is, notches 25c1 and 25c2 are provided at the upstream end and the downstream end of the sliding contact portions 250 of the pair of upstream return rails 25 shown on the upper side of FIGS. 6(a) and 6(b). It is The notch 25c1 shown in FIG. 6(a) is obtained by cutting out the inner part in the pond width direction into a rectangular shape, and the notch 25c2 shown in FIG. is lacking. In addition, the space provided by notching can be said to be a space provided by retreating from the inside in the width direction of the pond toward the outside. Hereinafter, the space provided by this notch or the space provided by retreating is simply referred to as space. The sliding contact portions 250 of each of the pair of upstream return rails 25 shown on the upper side of FIGS. A space S is provided in the direction inner portion.

In addition, notches 24c1 and 24c2 are formed at the upstream end and the downstream end of the sliding contact portion 240 of each of the pair of downstream return rails 24 shown on the lower side of FIGS. 6(a) and 6(b). is provided. The notch 24c1 shown in FIG. 6(a) is also cut out in a rectangular shape in the inner part in the pond width direction, and the notch 24c2 shown in FIG. 6(b) is also cut in a triangular shape in the inner part in the pond width direction. is lacking. Also here, the space provided by notching can be said to be a space provided by retreating from the inside in the width direction of the pond toward the outside, and the pair of space shown in the lower part of FIGS. The sliding contact portion 240 of each of the downstream return rails 24 is also provided with a space S' at the inner portion in the width direction of the upstream end and the inner portion in the width direction of the downstream end.

The upstream return rail 25 and the downstream return rail 24 shown in FIG. 7A are configured such that the upstream rail members 25-1, 24-1 and the downstream rail members 25-3, 24-3 are intermediate rail members. 25-2 and 24-2, the space formed inside the upstream rail members 25-1 and 24-1 is offset from the upstream rail member 25-2 in the width direction of the pond. 1 and 24-1 are retracted outward in the width direction of the pond. It can be said that it is a space provided by retracting 3 to the outside in the width direction of the pond. A space S is provided in the upstream end portion of the upstream return rail 25 shown in FIG. A space S′ is provided in the upstream end portion of the downstream return rail 24 in the pond width direction inner portion and the downstream end portion in the pond width direction inner portion thereof.

7(b), the upstream end and the downstream end of the sliding contact portions 250 and 240 of the upstream return rail 25 and the downstream return rail 24 are bent outward in the width direction of the pond. 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 is created inside the downstream end. The space can be said to be a space provided by retreating the downstream end to the outside in the width direction of the pond. A space S is provided at the inner part of the upstream end in the pond width direction and the inner part of the downstream end in the pond width direction of the upstream return rail 25 shown in FIG. A space S′ is provided in the upstream end portion of the downstream return rail 24 in the pond width direction inner portion and the downstream end portion in the pond width direction inner portion thereof.

6(a) and 6(b) and the upstream return rail 25 of FIGS. 7(a) and 7(b). Interference with the projecting portion 1233 of the restricting member 123 also occurs in the space S′ in each of the downstream return rail 24 in FIG. 7B and the downstream return rail 24 in FIGS. 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 is This is the space near the area through which the endless chain 11 travels. In the example shown in FIG. 6, since this space S does not have the sliding contact portion 250 , the projecting portion 1233 of the regulating member 123 can use this space S to enter below the sliding contact portion 250 . Since there is no sliding contact portion 250 in this space S also in the example shown in FIG. can enter. In the example shown in FIG. 7A, since there is no rail member itself, the projecting portion 1233 of the restricting member 123 uses this space S to enter below the sliding contact portion 250 of the intermediate rail member 25-2. be able to. In addition, the space S′ on the upstream side of the downstream return rail 24 is a region through which the restricting member 123 of the scraping member 12 attached to the slack portion 11l-2 of the endless chain 11 passes as the endless chain 11 travels. It is the space of the neighborhood. In the example shown in FIG. 6, there is no sliding contact portion 240 in this space S′, so the projecting portion 1233 of the regulating member 123 can enter below the sliding contact portion 240 using this space S′. Also in the example shown in FIG. 7(b), since there is no sliding contact portion 240 in this space S', the projecting portion 1233 of the regulating member 123 utilizes this space S' to be positioned below the sliding contact portion 250 in the intermediate portion. can enter the side. In the example shown in FIG. 7(a), since there is no rail member itself, the projecting portion 1233 of the restricting member 123 utilizes this space S' to be positioned below the sliding contact portion 240 of the intermediate rail member 24-2. can enter.

6(a) and 6(b) and FIGS. 7(a) and 7(b), the space S on the upstream side of the upstream return rail 25 and the space S on the upstream side of the downstream return rail 24 Comparing the space S' on the side, the latter is a longer space than the former. That is, in the example shown in FIG. 6 , the cutout width (retraction width) is the same, but the cutout length (retraction length) is longer in the downstream return rail 24 than in the upstream return rail 25 . Further, in the example shown in FIG. 7A, the lengths of the upstream rail members 25-1 and 24-1 and the lengths of the downstream rail members 25-3 and 24-3 are located downstream of the upstream return rail 25. The side return rail 24 is longer. Furthermore, in the example shown in FIG. 7B, the length of the portion bent outward in the pond width direction (the upstream end and the downstream end) is longer than the upstream return rail 25 on the downstream side. 24 is longer. As described above, since the slack portion 11l-2 of the endless chain 11 is slack, the track is unstable, and the downstream return rail 24 has a long space for avoiding interference with the projecting portion 1233 of the regulating member 123. is taken. The upstream space S′ of the downstream return rail 24 may be wider than the upstream space S of the upstream return rail 25 . That is, in the example shown in FIG. 6, the notch width (retraction width) of the downstream return rail 24 may be wider than that of the upstream return rail 25 . In the example shown in FIG. 7(a), the upstream rail members 25-1 and 24-1 are attached to the downstream return rail 24 more outwardly than the upstream return rail 25 in the width direction of the pond. good too. Furthermore, in the example shown in FIG. 7B, 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 width direction of the pond. The width of the bending inward in the width direction of the pond may be wider than the width. In other words, the position of the mounting portion 241 may be shifted outward in the width direction of the pond from the central position.

6(a) and 6(b) and the upstream return rail 25 of FIGS. b) and the downstream return rail 24 in FIGS. 7(a) and 7(b), the downstream spaces S, S' This is a space for avoiding interference when the endless chain 11 exits from the belt and for avoiding interference with the projecting portion 1233 when the endless chain 11 travels in reverse. In both the upstream return rail 25 and the downstream return rail 24, 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 space S, S'. In addition, although the widths are the same, the widths of the downstream spaces S and S' may be narrower than the upstream spaces S and S'.

In addition, it is preferable that the downstream end of the downstream return rail 24 is easier to avoid contact with the projecting portion 1233 than the downstream end of the upstream return rail 25 . Preferably, the upstream end of the upstream return rail 25 is easier to avoid than the end, and the upstream end of the downstream return rail 24 is easier to avoid than the upstream end of the upstream return rail 25. Facilitate is preferred.

FIG. 8 shows the projection of the restricting member approaching the upstream end portion of the downstream return rail of the second embodiment from obliquely above and entering below the sliding contact portion of the downstream return rail. It is a figure which shows a situation step by step. In FIG. 8, the horizontal direction of the drawing corresponds to the width direction of the sedimentation tank 1, and only both end portions in the width direction are shown, and the middle portion in the width direction of the raking member 12 is omitted from the drawing. The endless chain 11 is also omitted from the drawing.

FIG. 8(a) is a view showing from the downstream side how the projecting 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 has a base portion 1231 , an arm portion 1232 and a projecting portion 1233 . The arm portion 1232 is a portion extending downward, and the protruding portion 1233 is bent 90 degrees from the arm portion 1232 and protrudes outward in the width direction of the pond. The raking member 12 shown in FIG. 8(a) is shifted to one end side (left side in FIG. 8) in the width direction of the pond. Therefore, the protruding portion 1233 of the restricting member 123 on the one end side attached to the raking 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 of the downstream return rail 24 shown in FIG. 6(a). It is a space S' that is vacant toward the outside. Therefore, the protruding portion 1233 of the restricting member 123 on the one end side, which has approached, may be able to enter below the sliding contact portion 240 using this space S′. That is, it may be possible to prevent the projecting 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 raking member 12 is displaced in the width direction considerably, and even if the space S′ is provided, as shown in FIG. contact with the side return rail 24. However, since the contact surface 1233s of the projecting portion 1233 is a surface that is gradually inclined downward toward the other end in the pond width direction, the projecting portion 1233 follows the inclination of the contact surface 1233s as the endless chain 11 runs. is directed downwards. This point is the same as that described with reference to FIG. 3C in the first embodiment.

In FIG. 8C, the protrusion 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. . Further, the deviation of the raking member 12 toward one end in the width direction of the pond is eliminated, and the raking member 12 is in the normal position. The projecting portion 1233 of the restricting member 123 shown in FIG. 8(c) has not yet exceeded the notch 24c1 of the downstream return rail 24 shown in the lower side of FIG. 6(a), and is shown in FIG. 6(a). It is at the position of arrow c.

As the endless chain 11 continues to travel, the projecting portion 1233 of the regulating member 123 shown in FIG. Reaches below 240. The projecting portion 1233 of the restricting member 123 shown in FIG. 8(d) is located at the position of the arrow d shown in FIG. 6(a). 8(d), the protrusion 1233 of the regulating member 123 has a protrusion 1233 located right below the slide contact portion 240 of the downstream return rail 24. As shown in FIG.

The projecting portion 1233 of the regulating member 123 shown in FIG. 8(c) may be displaced when sloshing due to an earthquake occurs and the underwater track portion 11l-1 (see FIGS. 1 and 4) swings in the width direction of the pond. projecting direction tip 1233t contacts the root portion of the slide contact portion 240 with respect to the mounting portion 241 of the downstream return rail 24, and the underwater track portion 11l-1 is suppressed from swinging further in the width direction of the pond. However, if sloshing due to an earthquake occurs and the underwater track portion 11l-1 swings upward, the projecting portion 1233 of the restricting member 123 shown in FIG. It does not touch and cannot suppress upward swing. On the other hand, the protruding portion 1233 of the restricting member 123 shown in FIG. 8(d) is sloshing due to an earthquake, and even if the underwater track portion 11l-1 swings upward, the protruding direction tip of the protruding portion 1233 240 of the downstream return rail 24 from below in the protruding direction, and the underwater track portion 11l-1 is prevented from swinging further upward. A projecting direction tip portion of the projecting portion 1233 shown in FIG. 8D corresponds to an example of an upward restricting portion. Further, when the underwater track portion 11l-1 swings in the pond width direction, the projecting direction tip 1233t of the projecting portion 1233 shown in FIG. Function.

The relationship between the downstream return rail 24 and the projecting portion 1233 of the restricting member 123 in the second embodiment has been described above. The same is true of relationships.

Although it depends on the degree of displacement of the raking member 12 in the width direction of the pond, in most cases, the space S' prevents the projecting portion 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. 8B) of the projecting portion 1233 may be omitted. For example, it may be a restricting member 123 shown in FIG. 5(a).

FIG. 9 is a diagram showing a modification of the second embodiment. In FIG. 9, as in FIG. 8, the horizontal direction of the figure is the width direction of the sedimentation tank 1, and only both end portions in the width direction are shown, and the middle portion in the width direction of the raking member 12 is omitted. . The endless chain 11 is also omitted from the drawing.

Also in the modified example of the second embodiment, notches 24c1 are provided at the upstream end and the downstream end of the sliding contact portions 240 of the pair of downstream return rails 24, respectively. On the other hand, the regulating member 123 attached to the raking member 12 is different from the regulating member 123 attached to the raking member 12 shown in FIG. That is, the arm portion 1232 of the restricting member 123 shown in FIG. 9 is a portion that extends downward from the outside of the base portion 1231 in the width direction. The protruding portion 1233 is bent 90 degrees from the tip of the arm portion 1232 and protrudes inward in the width direction of the pond.

The projecting portion 1233 of the regulating member 123 shown in FIG. 9(a) is located at the position of the arrow d shown in FIG. 6(a). 240 is located directly below the tip portion in the projecting direction.

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

FIG. 9(c) shows the situation when sloshing due to an earthquake occurs and the underwater track portion 11l-1 swings to the other end in the width direction of the pond (to the right in FIG. 9). The arm portion 1232 positioned on the outside in the width direction of the regulation member 123 on the one end side in the pond width direction (the left side in FIG. 9) shown in FIG. 240 in the protruding direction, and the underwater track portion 11l-1 is prevented from swinging 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. In the description of the sludge scraping device of the third embodiment, the components having the same names as the components described in the description of the sludge scraping device of the first embodiment have the same reference numerals as those used in the description of the sludge scraping device of the first embodiment. are assigned the same reference numerals.

FIG. 10 is a diagram showing the relationship between the downstream return rail 24 and the projecting portion 1233 of the regulating member 123 in the sludge gathering device of the third embodiment. This FIG. 9 is a cross-sectional view along a vertical line passing through the center of the sprocket 16, which is a driven sprocket, and the lateral direction of the drawing corresponds to the width direction of the sedimentation tank 1. As shown in FIG.

The relationship between the upstream return rail 25 and the projecting portion 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, as shown in FIG. be. In FIG. 10, the upstream return rail 25 shown in FIG. 3(a) is indicated by a one-dot 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. The 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 lower mounting portion 241. It is In the third embodiment, the distance between the downstream return rail 24 and the projecting portion 1233 of the restricting member 123 of the raking member 12 sliding on the upstream return rail 25 is greater than the distance in the width direction between the upstream return rail 25 and the raking member 12 sliding on the upstream return rail 25 . The gap in the width direction between the raking member 12 sliding on the downstream return rail 24 and the projecting portion 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 track is unstable, and the scraping member 12 attached to the slack portion 11l-2 is likely to be displaced in the pond width direction. For this reason, the downstream return rail 24 has a longer widthwise distance from the projecting portion 1233 of the restricting member 123 than the upstream return rail 25, so that contact with the projecting portion 1233 can be easily avoided. If the downstream return rail 24 is installed outside the upstream return rail 25 in the pond width direction, the downstream return rail 24 may not need to be provided with the notches 24c1 and 24c2 described with reference to FIG. be. However, the further the downstream side return rail 24 is installed on the outside in the pond width direction, the more difficult it becomes to regulate the upward direction by the regulating member 123. In some cases, it may be preferable to provide the contact portion 240 with a wide portion.

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

It should be noted that the closer the downstream return rail 24 is provided to the outer side in the width direction of the pond, the easier it is to prevent the projecting portion 1233 of the regulating member 123 from coming into contact with the downstream return rail 24 . Therefore, the downstream return rail 24 may be provided on the outside in the width direction of the pond, and the inclined contact surface 1233s of the projecting portion 1233 may be omitted. For example, it may be a restricting member 123 shown in FIG. 5(a).

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, the components having the same names as the components described in the description of the sludge scraping device of the first embodiment have the same reference numerals as those used in the description of the sludge scraping device of the first embodiment. are assigned the same reference numerals.

FIG. 11 is a diagram showing the relationship between the downstream return rail 24 and the projecting portion 1233 of the regulating member 123 in the sludge raking device of the fourth embodiment. Like FIG. 10, FIG. 11 is also a cross-sectional view along the vertical line passing through the center of the sprocket 16, which is the driven sprocket, and the horizontal direction of the drawing is the width direction of the sedimentation tank 1. FIG.

The relationship between the upstream return rail 25 and the projecting portion 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. be. Also in FIG. 11, the upstream return rail 25 shown in FIG. 3(a) is indicated by a dashed line for reference. In the upstream return rail 25, the projecting direction tip 2501 of the sliding contact portion 250 is directed inward in the pond width direction.

On the other hand, in the downstream return rail 24, the projecting direction tip 2401 of the sliding contact portion 240 faces outward in the pond width direction. 11 also shows the downstream return rail 24 in gray. The 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 lower mounting portion 241. It is However, as described above, the projecting direction of the sliding contact portion 240 is different. This is because the upstream return rail 25 and the downstream return rail 24 are installed in opposite directions. That is, the upstream return rail 25 has a portion (sliding contact portion 250) of the raking member 12 attached to the water surface track portion 11w (see FIGS. 1 and 2) that protrudes toward the side where the regulation member 123 is provided. On the other hand, the downstream return rail 24 protrudes to the side where the regulation 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) of the raking member 12 attached to the underwater track portion 11l-1, which protrudes on the side opposite to the side on which the regulation member 123 is provided. have. As a result, the downstream return rail 24 and its downstream return rail 24 and their downstream return rail 24 and their downstream return rail 24 and their downstream return rail 24 and their downstream return rails 24 and 25 are closer to each other than the upstream return rail 25 and the projecting portion 1233 of the restricting member 123 of the raking member 12 sliding on the upstream return rail 25 . The gap in the pond width direction between the scraping member 12 sliding on the rail 24 and the projecting portion 1233 of the restricting member 123 is longer. The downstream return rail 24 is less likely to interfere with the protrusion 1233 of the regulating member 123 than the rail 25 . As described above, since the slack portion 11l-2 of the endless chain 11 is slack, the track is unstable, and the scraping member 12 attached to the slack portion 11l-2 is likely to be displaced in the pond width direction. For this reason, the downstream return rail 24 has a longer distance from the projection direction tip 1233t of the projecting portion 1233 than the upstream return rail 25, so that contact with the projecting portion 1233 can be easily avoided.

In addition, by directing the projecting direction tip 2401 of the sliding contact portion 240 on the downstream return rail 24 to the outside in the pond width direction, it is easy to avoid the projecting 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 protruding end 2401 of the sliding contact portion 240 facing outward in the width direction of the pond, and the inclined contact surface 1233s of the protruding portion 1233 may be omitted. For example, it may be a restricting member 123 shown in FIG. 5(a).

Moreover, the downstream return rail and the upstream return rail may have an upside-down L-shaped cross section, a T-shaped cross section, or a C-shaped cross section. or U-shaped cross section.

Furthermore, the intermediate sprocket 15 is omitted, the water surface track Tw is eliminated, and the raking track Tk, the upstream track Tu which is the rising track, and the inclined track connecting the drive sprocket 14 and the sprocket 16 are connected to form a substantially triangular orbit. In the case of an endless chain running on a track, the upstream return rail 25 is unnecessary and the downstream return rail 24 exists. The technology described here can also be applied to the sludge scraping device that has.

Finally, a modified example of the restricting member will be described.

FIG. 12 is a diagram showing a modification of the restricting member. This FIG. 12 is a cross-sectional view taken along a vertical line passing through the center of the drive sprocket 14 as in FIG. 12, the drive chain 211 (see FIG. 1) for transmitting the torque to the drive sprocket 14 is omitted in the same way as in FIG. 3(a).

The conventional restricting member 123 has been attached to the raking member 12 and positioned below the water surface WL. Also, the restricting member 123 has a projecting portion 1233 . On the other hand, the regulating member 19 shown in FIG. 12 is not attached to the raking member 12, but is fixed above the water surface WL. That is, it is provided near the upper corner of the raking member 12 . A return shoe 122 is attached to the raking member 12 .

The restricting member 19 shown in FIG. 12 has an upside-down L-shaped cross section, which has the same shape as the upstream return rail 25, and is similar to the upstream return rail 25 in the water flow direction. extended to The regulating member 19 is attached to a plurality of attachment members (not shown) fixed to each of the pair of side walls 1c. It is a test. That is, the mounting member only needs to extend to the vicinity of the upper corner of the raking member 12 .

The restricting member 19 shown in FIG. 12 has a lateral restricting portion 191 and an upward restricting portion 192 . When sloshing due to an earthquake occurs and the water surface track portion 11w (see FIGS. 1 and 2) swings in the width direction of the pond, the vertical edge 12a of the raking member 12 abuts on the lateral direction restricting portion 191, and the water surface track portion is moved. 11w is suppressed from swinging further in the width direction of the pond. Also, when sloshing occurs due to an earthquake and the water surface track portion 11w swings upward, the edge 12b in the pond width direction of the scraping member 12 abuts the upward regulation portion 192, and the water surface track portion 11w moves upward. Further swinging is suppressed.

As a countermeasure against shaking of the underwater track portion 11l-1 due to sloshing of an earthquake, a restricting member similar to the downstream return rail 24 is provided near the upper corner of the raking member 12 attached to the underwater track portion 11l-1. May be extended. The restricting member in this case is fixedly arranged in the water.

To summarize the sludge scraping device provided with the regulating member 19 of the modified example described above,
"In a sludge scraping device installed in a sedimentation tank in which the sludge contained in the water settles to the bottom of the pond while the water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain runs;
A sludge scraping device, comprising: a sludge scraping device, comprising a regulating member that abuts against the scraping member that slides on the first rail member when the endless chain sways and regulates the swaying of the endless chain. ”
becomes.

According to this sludge raking 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 the outer peripheral edge of the raking member that slides on the rail member, thereby regulating the swinging of the endless chain. The shape of the outer peripheral edge may protrude or may be recessed.

Further, the regulating member has a portion that abuts on the edge of the scraping member in the width direction and a portion that abuts on the edge of the scraping plate in the vertical direction. That is, it has a horizontal direction regulation part which regulates the water surface track portion from swinging in the width direction of the pond, and an upward direction regulation part which regulates the water surface track portion from swinging upward.

Further, the regulating member is arranged in the vicinity of an upper corner of a 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 to regulate swinging of the endless chain. It is a thing.

Moreover, although the raking member has a rectangular raking surface, the upper corners may be curved portions instead of corners.

Further, the regulating member is attached to a side wall located at an end in the width direction of the pond via an attachment member. The mounting member only needs to extend from the side wall to the vicinity of the upper corner of the scraping 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 direction in which the water flows, and the scraping plate attached to the water surface track portion of the endless chain running on the water surface side is mounted and the scraping plate slides. The regulating member is arranged in the vicinity of the upper corner of the raking member attached to the water surface track portion, and when the water surface track portion swings, it abuts on the upper corner of the raking member and the water surface track. It regulates the runout of the part.

Also, in previous statements,
"In a sludge scraping device installed in a sedimentation tank in which the sludge contained in the water settles to the bottom of the pond while the water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
A raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and a water flow direction from the upstream side in which the water flows. an endless chain running on a water surface track that extends downstream on the water surface side but is shorter than the raking track, and a circular track that connects the downstream track that connects the water surface track and the raking track;
A raking member is placed on the raking track and is attached to a portion of the endless chain that runs on the raking track side of the raking track in the downstream track. a sliding first rail member;
a second rail member extending in the direction of the water flow on the water surface side and having a raking member attached to a water surface track portion of the endless chain that runs on the water surface track and on which the raking member slides. ,
The raking member has a regulating member that regulates vibration of the endless chain,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The sludge raking device, wherein the contact surface of the regulating member, which may come into contact with the second rail member from above as the endless chain travels, is inclined downward. ”
explained.

again,
"In a sludge scraping device installed in a sedimentation tank in which the sludge contained in the water settles to the bottom of the pond while the water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
A raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and a water flow direction from the upstream side in which the water flows. an endless chain running on a water surface track that extends downstream on the water surface side but is shorter than the raking track, and a circular track that connects the downstream track that connects the water surface track and the raking track;
A raking member is placed on the raking track and is attached to a portion of the endless chain that runs on the raking track side of the raking track in the downstream track. a sliding first rail member;
a second rail member extending in the direction of the water flow on the water surface side and having a raking member attached to a water surface track portion of the endless chain that runs on the water surface track and on which the raking member slides. ,
The raking member has a regulating member that regulates vibration of the endless chain,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The first rail member is in the vicinity of a region through which the regulating member of the raking member attached to the portion of the endless chain that runs on the water surface track side of the downstream track passes as the endless chain runs. A sludge scraping device characterized in that a space is provided in the ”
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 move. The restricting member of the raking member attached to the traveling portion is prevented from interfering with the first rail member.

The second rail member is in the vicinity of a region through which the regulating member of the scraping member attached to the part of the endless chain running on the water surface track side of the upstream track passes as the endless chain runs. A space may be provided in the space. The space referred to here may be a space provided by notching or a space provided by retreating. The restricting member of the raking member attached to the portion running on the side is suppressed from interfering with the second rail member.

note that,
"In a sludge scraping device installed in a sedimentation tank in which the sludge contained in the water settles to the bottom of the pond while the water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
A raking track extending along the bottom of the pond, a rising track rising from the raking track toward the water surface, and an inclination extending from the water surface to the raking track. an endless chain running on a circular orbit where the orbits are connected;
A raking member installed along the raking track and attached to a portion of the endless chain that runs on the raking track side of the inclined track is placed on the raking track, and the raking member slides. a moving first rail member;
The raking member has a regulating member that regulates vibration of the endless chain,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The first rail member is positioned in the vicinity of a region through which the regulating member of the scraping member attached to the portion of the endless chain that runs on the water surface side of the inclined track passes as the endless chain travels, A sludge raking device characterized by having a space. ”
may be

again,
"In a sludge scraping device installed in a sedimentation tank in which the sludge contained in the water settles to the bottom of the pond while the water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
A raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and a water flow direction from the upstream side in which the water flows. an endless chain running on a water surface track that extends downstream on the water surface side but is shorter than the raking track, and a circular track that connects the downstream track that connects the water surface track and the raking track;
A raking member is placed on the raking track and is attached to a portion of the endless chain that runs on the raking track side of the raking track in the downstream track. a sliding first rail member;
a second rail member extending in the direction of the water flow on the water surface side and having a raking member attached to a water surface track portion of the endless chain that runs on the water surface track and on which the raking member slides. ,
The raking member has a regulating member that regulates vibration of the endless chain,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The sludge raking device, wherein the first rail member is installed outside the second rail member in the width direction of the sedimentation tank. ”
also explained.

again,
"In a sludge scraping device installed in a sedimentation tank in which the sludge contained in the water settles to the bottom of the pond while the water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
A raking track extending along the bottom of the pond, an upstream track rising from the raking track toward the water surface, and a water flow direction from the upstream side in which the water flows. an endless chain running on a water surface track that extends downstream on the water surface side but is shorter than the raking track, and a circular track that connects the downstream track that connects the water surface track and the raking track;
A raking member is placed on the raking track and is attached to a portion of the endless chain that runs on the raking track side of the raking track in the downstream track. a sliding first rail member;
a second rail member extending in the direction of the water flow on the water surface side and having a raking member attached to a water surface track portion of the endless chain that runs on the water surface track and on which the raking member slides. ,
The raking member has a regulating member that regulates vibration of the endless chain,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The gap between the first rail member and the regulating member of the raking member sliding on the first rail member is larger than the gap between the second rail member and the regulating member of the raking member sliding on the second rail member. A sludge raking device characterized in that the sludge raking device is longer. ”
also explained.

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

The second rail member has a portion of the raking member attached to the water surface track portion that protrudes toward the side where the regulation member is provided, while the first rail member The raking member attached to the track portion may not have a portion projecting to the side where the regulating member is provided. Further, the first rail member may have a portion of the raking member attached to the underwater track portion that protrudes on the side opposite to the side on which the regulating member is provided.

Further, the first rail member and the second rail member are rail members having the same shape, but are mounted in opposite directions, and the first rail member is more likely to be attached to the restricting member than the second rail member. It may be a mode in which it is difficult to interfere with.

A plurality of embodiments and modifications have been described above, and any of the embodiments and modifications are high-quality sludge scraping devices.

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

1 sedimentation tank 1d pond bottom 10 sludge raking device 11 endless chain 12 raking member 123 regulating member 1233 projecting portion 1233s contact surface 1233t projecting direction tip 16 sprocket 24 downstream return rail 240 sliding contact portion 242s guide surface 25 upstream return rail 250 sliding Contact portion Tw Water surface track Tl Downstream track Tk Scraping track Tu Upstream track 11w Water surface track portion 11l Downstream track portion 11l-1 Underwater track portion 11l-2 Slack portion 11k Scraping track portion 11u Upstream track portion

Claims (6)

In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a contact surface inclined downward, which may come into contact with the first rail member from above when the endless chain travels ,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The first rail member is in the vicinity of a region through which the regulating member of the raking member attached to the portion of the endless chain that runs on the water surface track side of the downstream track passes as the endless chain runs. A sludge scraping device characterized in that a space is provided in the In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a contact surface inclined downward, which may come into contact with the first rail member from above when the endless chain travels ,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The sludge raking device , wherein the first rail member is installed outside the second rail member in the width direction of the sedimentation tank . In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The regulating member has a contact surface inclined downward, which may come into contact with the first rail member from above when the endless chain travels ,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The gap between the first rail member and the regulating member of the raking member sliding on the first rail member is larger than the gap between the second rail member and the regulating member of the raking member sliding on the second rail member. A sludge raking device characterized in that the sludge raking device is longer . In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels ,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The first rail member is in the vicinity of a region through which the regulating member of the raking member attached to the portion of the endless chain that runs on the water surface track side of the downstream track passes as the endless chain runs. A sludge scraping device characterized in that a space is provided in the In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels ,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The sludge raking device , wherein the first rail member is installed outside the second rail member in the width direction of the sedimentation tank . In a sludge raking device installed in a sedimentation tank in which sludge contained in sludge settles at the bottom of the pond while water containing sludge flows,
A scraping member for scraping the sludge that has settled on the bottom of the pond;
an endless chain in which a plurality of the scraping members are attached at intervals and which circulates the scraping members between the pond bottom side and the water surface side by running;
a first rail member extending in the water flow direction of the water, and on which the scraping member is placed and slides when the endless chain travels,
The raking member has a restricting member that abuts against the first rail member when the endless chain swings and restricts swinging of the endless chain,
The first rail member is provided with a guide surface that guides the regulating member downward when the regulating member comes into contact with the regulating member from above as the endless chain travels ,
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 from the upstream side toward the downstream side in the water flow direction on the water surface side. It travels on a circular track that connects a water surface track that is shorter than the raking track and a downstream track that connects the water surface track and the raking track,
The first rail member is installed on the raking track along the raking track, and the raking member attached to the underwater track portion of the endless chain that runs on the raking track side of the downstream track. The scraping member is placed and slides,
further comprising a second rail member installed on the water surface side and on which a raking member attached to a water surface track portion of the endless chain that runs on the water surface track is mounted and the raking member slides,
The regulating member of the raking member attached to the underwater track portion abuts against the first rail member when the underwater track portion swings, thereby regulating the swinging of the underwater track portion;
The regulating member of the raking member attached to the water surface track portion abuts against the second rail member when the water surface track portion swings, thereby regulating the vibration of the water surface track portion,
The gap between the first rail member and the regulating member of the raking member sliding on the first rail member is larger than the gap between the second rail member and the regulating member of the raking member sliding on the second rail member. A sludge raking device characterized in that the sludge raking device is longer .

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