JP6847471B2 - Sludge scraper - Google Patents

Description

The present invention relates to a sludge collecting device provided in a settling basin that receives water containing sludge and causes the sludge contained in the water to settle at the bottom of the pond while the water flows.

As a sludge scraping device, a sludge scraping device including an endless chain having a scraping member extending in the pond width direction orthogonal to the water flow direction in which the received water flows is known. In this sludge scraping device, the scraping member is circulated and moved on the bottom side and the water surface side of the settling basin by rotating the endless chain in the normal direction. A part of the endless chain is wound on the upstream side in the water flow direction on the water surface side, and a driving wheel for transmitting the driving force for circulating the endless chain to the endless chain is arranged. Further, on the downstream side in the water flow direction on the water surface side, a part of the endless chain is wound around, and a driven wheel that rotates following the running of the endless chain is arranged. The scraping member scrapes the sludge that has settled on the bottom of the pond when traveling on the bottom of the sedimentation basin, and scrapes the scum floating on the water surface when traveling on the water surface side. Further, on the water surface side of the settling basin, a rail member that extends in the water flow direction and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels on the water surface side is provided.

The endless chain is installed with some margin in the circulation direction. This is because if the endless chain is installed in a tight and taut state, the driving force for running the endless chain increases and there is a risk of malfunction. By giving a margin in the circulation direction, the endless chain has some slack from the beginning when it is installed. In addition, the endless chain tends to stretch for a while after the start of traveling, and as a result, the slack tends to gradually increase until a certain period of time after installation.

By the way, in a settling basin where a sludge collecting device is installed, the endless chain may be derailed from rotating wheels such as driving wheels and trailing wheels due to the influence of an earthquake. It has been found that the reason why the endless chain derails from the rotating wheel is not the direct effect of the shaking caused by the earthquake, but rather the effect of sloshing, in which the water near the water surface in the settling pond is greatly rippling due to the earthquake. When sloshing occurs, the water surface side part of the endless chain (hereinafter sometimes referred to as the water surface side part of the chain) sways greatly, and the swaying force is transmitted to the part of the endless chain that is wound around the rotating wheel. The endless chain may come off the rotating wheel.

As a countermeasure against this earthquake, a sludge scraping device has been proposed in which an upward regulating portion for suppressing upward swing of the water surface side portion of the chain is provided on the endless chain (see, for example, Patent Document 1). The rail member of Patent Document 1 has a contact portion in which the upward regulating portion abuts from the pond bottom side when the water surface side portion of the chain swings upward. This contact portion is between the drive wheel and the trailing wheel arranged on the water surface side, and when viewed in the pond width direction (when viewed in the direction in which the rotation axis of the drive wheel extends), the contact portion is formed with the drive wheel. Are arranged at large intervals in the water flow direction (longitudinal direction). The sludge scraping device described in Patent Document 1 is configured so that the upward regulating portion and the rail member come into contact with each other when the water surface side portion of the chain is likely to swing significantly upward due to the shaking caused by sloshing. , It is intended to suppress the upward runout in the water surface side portion of the chain. In the sludge scraping device of Patent Document 1, it is necessary that the upward regulating portion provided on the circularly moving endless chain enters the pond bottom side (lower side) of the contact portion of the rail member.

Japanese Unexamined Patent Publication No. 2011-5400

Here, on the water surface side portion of the chain, slack may occur on the downstream side in the circulation direction from the portion wound around the drive wheels, and the behavior of the endless chain may become unstable, such as the endless chain bending upward. .. The contact portion of the sludge scraping device of Patent Document 1 is in the water flow direction (longitudinal direction) with the drive wheel when viewed in the pond width direction (when viewed in the direction in which the rotation axis of the drive wheel extends). Since they are arranged at a large distance, the endless chain may bend upward between the contact portion and the drive wheel. If the amount of the endless chain flexing upward is large, the upward regulating portion may be located at the same height as the abutting portion or above the abutting portion. If the upward regulating portion is at the same height as the abutting portion, the upward regulating portion and the abutting portion may collide with each other, and the upward regulating portion or the rail member may be damaged. Further, if the upward regulating portion does not enter below the contact portion, the effect of suppressing the runout of the endless chain cannot be obtained, and there is a possibility that the endless chain may come off from the rotating wheel.

In view of the above circumstances, it is an object of the present invention to provide a sludge scraping device capable of surely preventing an endless chain from coming off from a rotating wheel even if an earthquake occurs.

The sludge scraping device of the present invention that solves the above object is
It is provided in a settling basin that receives water containing sludge and the sludge contained in the water settles at the bottom of the pond while the water flows. In a sludge scraping device that scrapes by members
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
A rail member that extends in the direction of the water flow on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The endless chain is wound around the endless chain, and the endless chain is provided with a driving wheel that transmits a driving force to run the endless chain.
The scraping member includes a shoe that is in sliding contact with the rail member and a regulating member that regulates the runout of the endless chain.
The drive wheels have teeth protruding in the radial direction.
The rail member has a sliding contact portion in contact with the shoe, and has a sliding contact portion.
The restricting member is arranged so as to overlap the sliding contact portion in the pond width direction with a downward interval from the sliding contact portion, and when the water surface side portion of the endless chain swings upward, the sliding contact portion is subjected to. It has a pond width direction protrusion that abuts and protrudes in the pond width direction.
The endless chain is formed by connecting link members having a pair of link plates arranged at a distance in the pond width direction.
The interval is shorter than the overlap distance from the lower end of the link plate constituting the link member to the tip of the tooth in a state where the teeth of the drive wheel and the link member are in mesh with each other.

Further, in the sludge scraping device of the present invention,
The interval may be less than half of the overlap distance.

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

It is a side sectional view of the sedimentation basin where the sludge scraping device which is one Embodiment of this invention is installed. It is a partially enlarged view which enlarged the part A of FIG. FIG. 2 is a cross-sectional view taken along the line BB of FIG. FIG. 2 is a cross-sectional view taken along the line CC of FIG. It is a figure which shows the 1st modification of this embodiment. It is a figure which shows the 2nd modification of this embodiment. (A) is a diagram showing a pinned sprocket used when a notch chain is used, and (b) shows a state in which a part of the notch chain is wound around the pinned sprocket shown in (a). It is a figure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

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

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

The sludge scraping device 10 of the present embodiment includes an endless chain 11. The endless chains 11 are provided at both ends of the settling basin 1 in the pond width direction, and are hung on a pair of chain main bodies 101 running in the settling basin 1 and the pair of chain main bodies 101, and are hung in the pond width direction. It is provided with a plurality of extending scraping members 12. Each of the chain bodies 101 provided at both ends in the pond width direction has a pond bottom orbit T1 on the pond bottom 1d side and a downstream orbit T2 extending from the pond bottom orbit T1 toward the water surface W on the downstream side of the settling basin 1. It is an annular chain that forms a circular orbit in which an upstream orbit T3 extending from the pond bottom orbit T1 toward the water surface W on the upstream side of the settling basin 1 and a water surface orbit T4 on the water surface W side are connected. As the chain body 101 travels on the orbit, the scraping member 12 circulates on the pond bottom 1d side and the water surface W side. In FIG. 1, the chain body 101 is shown in an orbit.

Sprockets 14 to 17 are arranged at both ends of the orbits T1 to T4. A part of the chain body 101 is wound around the sprockets 14 to 17, and the wound portion of the chain body 101 wound around the sprockets 14 to 17 meshes with the sprockets 14 to 17.

The sprocket 14 is arranged on the upstream side of the water surface orbit T4. In the following description, the sprocket 14 may be referred to as a 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 pond width direction and is rotatably supported by bearings 142 (see FIG. 4) fixed to each of the pair of side walls 1c. The drive shaft 141 shown in FIG. 1 is connected to the motor 21 by a drive chain 211. As the motor 21 rotates, the drive sprocket 14 also rotates via the drive shaft 141. The drive sprocket 14 of the present embodiment corresponds to an example of a drive wheel that transmits a driving force to the endless chain 11 to drive the endless chain 11.

The motor 21 is a motor that can rotate in both the clockwise direction and the counterclockwise direction in FIG. The motor 21 is usually driven to rotate clockwise in FIG. As the motor 21 rotates clockwise, the drive sprocket 14 rotates clockwise, causing the endless chain 11 to travel clockwise. Hereinafter, the rotation of the drive sprocket 14 in the clockwise direction in FIG. 1 may be referred to as a forward rotation drive, and the rotation of the endless chain 11 in the clockwise direction in FIG. 1 may be referred to as a forward rotation drive. When the drive sprocket 14 is driven in the forward direction, the portion of the endless chain 11 on the water surface track T4 (hereinafter, may be referred to as the water surface track portion 11a) travels from the upstream side to the downstream side.

Further, the motor 21 has a torque limiter function. For example, if a foreign substance is caught in the scraping member 12 attached to the chain body 101 running on the bottom of the pond 1d and an excessive load is applied to the motor 21, the torque limiter function is activated and the motor 21 is temporarily stopped. .. Then, the motor 21 reverses (rotates counterclockwise in FIG. 1) for a short time in order to release the biting of the foreign matter. As the motor 21 reverses, the drive sprocket 14 rotates counterclockwise in FIG. 1 and causes the endless chain 11 to travel counterclockwise (so-called reverse operation). Hereinafter, the rotation of the drive sprocket 14 counterclockwise in FIG. 1 may be referred to as reverse drive, and the rotation of the endless chain 11 counterclockwise in FIG. 1 may be referred to as reverse travel. When the drive sprocket 14 is reversely driven, the water surface track portion 11a travels from the downstream side to the upstream side.

The other sprockets 15 to 17 are driven sprockets that rotate following the running of the endless chain 11. Fixed shafts 151, 161, 171 are passed through the central portion of the sprockets 15 to 17. The fixed shafts 151, 161, 171 are fixedly arranged around the shaft so as not to rotate. All of the sprockets 15 to 17 are rotatable with respect to the fixed shafts 151, 161, 171. Each sprocket 14 to 17 is a rotating wheel that rotates with the drive shaft 141 and the fixed shafts 151, 161, 171 as the rotating shafts. The sprocket 15 is arranged on the downstream side of the water surface orbit T4. In the following description, the sprocket 15 may be referred to as an intermediate sprocket 15. The intermediate sprocket 15 corresponds to an example of a driven wheel in the present invention.

A plurality of the scraping members 12 are attached at equal or substantially even intervals in the circulation direction over the entire circumference of the orbital track of the chain body 101. A pond bottom rail 23 extending in the longitudinal direction of the settling basin 1 is fixed to the pond bottom portion 1d of the settling basin 1 along the pond bottom portion 1d. The scraping member 12 scrapes the sludge settled on the pond bottom portion 1d by moving guided by the pond bottom rail 23 in the pond bottom track T1.

Further, a downstream return rail 25 that is substantially parallel to the pond bottom 1d and extends in the longitudinal direction of the settling basin 1 is fixed at a predetermined height position from the pond bottom 1d on the downstream side of the settling basin 1. ing. The downstream return rail 25 is attached to a plurality of downstream pedestals 251 fixed to each of the pair of side walls 1c. When the endless chain 11 is traveling in the normal direction, the scraping member 12 attached to the chain body 101 moves by being guided by the downstream return rail 25 on the downstream side of the downstream track T2.

Further, an upstream return rail 24 extending in the water flow direction along the water surface W is fixed on the upstream side of the settling basin 1 and in the vicinity of the water surface W. The upstream return rail 24 in the present embodiment corresponds to an example of a rail member in the present invention. The upstream return rail 24 is attached to a plurality of upstream pedestals 247 fixed to each of the pair of side walls 1c. The scraping member 12 attached to the chain body 101 moves guided by the upstream return rail 24 on the water surface track T4. The upstream return rail 24 will be described in detail later.

When the endless chain 11 rotates in the normal direction, the scraping member 12 located on the pond bottom track T1 moves along the pond bottom portion 1d from the downstream side to the upstream side. The sludge that has settled in the pond bottom 1d is scraped toward the sludge pit 50 on the upstream side by the scraping member 12 that moves in the pond bottom 1d. The sludge attracted to the sludge pit 50 is discharged to the outside of the settling basin 1 by a sludge pump (not shown).

A scum is floating on the water surface W of the settling basin 1. When the endless chain 11 rotates in the normal direction, the scraping member 12 located on the water surface track T4 moves along the water surface W from the upstream side to the downstream side. The scum floating on the water surface W is attracted toward the scum removing device 30 on the downstream side by the scraping member 12 moving on the water surface orbit T4. The scum attracted to the scum removing device 30 side is discharged to the outside of the settling basin 1 by the scum removing device 30 together with the water in the settling basin 1. Further, the water in the settling basin 1 from which the scum and sludge have been removed passes under the scum removing device and flows into the drainage gutter 40, flows from the drainage gutter 40 into a drainage channel (not shown), and drains to the outside of the settling basin 1. Will be done.

The chain body 101 is installed in a state having an appropriate margin in the circulation direction from the beginning when it is installed in the settling basin 1 in order to prevent the driving force for running the chain body 101 from increasing. The chain body 101 has an amount of slack corresponding to the margin. Further, for a while after the start of traveling, the chain main body 101 tends to be stretched due to familiarity with the chain main body 101, a creep phenomenon, or the like, and as a result, the slack tends to gradually increase as compared with the case where the chain main body 101 is installed. After running the endless chain 11 to some extent, the occurrence of elongation is almost eliminated.

When the endless chain 11 travels, a traveling load generated by the scraping member 12 scraping sludge is applied to the portion of the endless chain 11 located on the pond bottom track T1. When the endless chain 11 is traveling in the normal direction, tension is generated in the portion of the chain body 101 located on the pond bottom track T1 and the upstream track T3 according to the running load. On the other hand, slack occurs in the portions of the chain body 101 located on the downstream side track T2 and the water surface track T4. FIG. 1 shows a state in which slack is generated in the portions located on the downstream side orbit T2 and the water surface orbit T4.

FIG. 2 is a partially enlarged view of part A of FIG. 1. In FIG. 2, the chain main body 101 is shown by a long-dotted chain line except for a part.

The chain body 101 is a metal chain in which a plurality of link members 110 are connected. A resin chain may be used as the chain body 101. Each link member 110 is connected by a connecting pin (not shown). In the present embodiment, the link members 110'provided with the stays 113 are arranged every 20 link members 110 connected in the circulation direction of the chain body 101. The stay 113 is for connecting the link member 110 and the scraping member 12. The stay 113 and the scraping member 12 are connected by a screw (not shown).

As shown in FIG. 2, the upstream return rail 24 is composed of a sliding contact portion 240 on the upper portion and a mounting portion 241 on the lower portion. In the present embodiment, the sliding contact portion 240 also serves as the contact portion in the present invention. The sliding contact portion 240 has a horizontal portion 242, a driving wheel side inclined portion 243, and a driven wheel side inclined portion 244. The horizontal portion 242 extends horizontally from the vicinity of the driving sprocket 14 to the vicinity of the intermediate sprocket 15 when viewed in the pond width direction. The drive wheel side inclined portion 243 is inclined upward from the end portion of the horizontal portion 242 on the drive sprocket 14 side toward the upstream side. The drive wheel side inclined portion 243 is formed in an arc shape substantially along the pitch circle of the drive sprocket 14. The upstream end surface of the drive wheel side inclined portion 243 is located on the vertical line of the drive wheel top portion at the upper end of the drive sprocket 14 when viewed in the pond width direction. However, the inclined portion 243 on the drive wheel side may extend beyond the position of the top portion of the drive wheel to the upstream side as shown by the alternate long and short dash line in FIG. Further, it may be shorter than the position of the top portion of the drive wheel to the downstream side. Further, the drive wheel side inclined portion 243 may be inclined upward toward the upstream side, and may be formed in a straight line, for example.

The driven wheel side inclined portion 244 is inclined upward from the intermediate sprocket 15 side end portion of the horizontal portion 242 toward the downstream side. The driven wheel side inclined portion 244 is formed in an arc shape substantially along the pitch circle of the intermediate sprocket 15. The downstream end surface of the driven wheel side inclined portion 244 is located on the vertical line of the intermediate wheel top portion at the upper end of the intermediate sprocket 15 when viewed in the pond width direction. However, the driven wheel side inclined portion 244 may extend beyond the position of the intermediate wheel top portion to the downstream side as shown by the alternate long and short dash line in FIG. Further, it may be shorter than the position of the top portion of the intermediate wheel to the upstream side. Further, the driven wheel side inclined portion 244 may be inclined upward toward the downstream side, and may be formed in a straight line, for example.

Further, in the present embodiment, the horizontal portion 242, the driving wheel side inclined portion 243, and the driven wheel side inclined portion 244 are integrally formed, but each portion is formed separately and arranged with a slight gap. You may. When it is divided and formed and arranged with a gap, even if each part expands due to heat or the like, the expanded portion can be absorbed by the gap. Further, the horizontal portion 242 may be formed by dividing the horizontal portion 242 into a plurality of parts, and may be arranged with some gaps. When providing a gap, if the gap is made wider than the length of the link member 110 along the orbit around the chain body 101, the link member 110 may enter the gap. In order to prevent the link member 110 from entering the gap, it is desirable that the gap be narrower than the above-mentioned length of the link member 110.

As described above, the water surface track portion 11a of the endless chain 11 traveling in the normal direction has slack. In the present embodiment, this slack is used to determine the position where the portion between the drive wheel top portion and the intermediate wheel top portion of the water surface track portion 11a becomes the upper end position in the drive sprocket 14 and the upper end position in the intermediate sprocket 15. I try to run on the bottom side of the pond rather than the straight line that connects them. More precisely, from the straight line S (indicated by a thin line in FIG. 2) connecting the top portion of the drive wheel, which is the upper end of the pitch circle of the drive sprocket 14, and the top portion of the middle wheel, which is the upper end of the pitch circle of the intermediate sprocket 15. Also, the track of the portion of the water surface track portion 11a between the drive wheel top portion and the intermediate wheel top portion runs on the pond bottom side. By doing so, the winding angle at which the chain body 101 is wound around the drive sprocket 14 and the intermediate sprocket 15 is increased as compared with the case where there is no slack. The larger the winding angle, the more difficult it is for the chain body 101 to derail from the drive sprocket 14 and the intermediate sprocket 15. In the present embodiment, the winding angle around the drive sprocket 14 is about 100 degrees as a whole, and about 20 degrees is wound on the downstream side of the top portion of the drive wheels. The winding angle of the intermediate sprocket 15 is about 50 degrees as a whole, and the intermediate sprocket 15 is wound about 20 degrees on the upstream side of the top of the intermediate wheel. That is, in the present embodiment, the winding angle of each of the drive sprocket 14 and the intermediate sprocket 15 is increased by about 20 degrees by utilizing the slack.

In the portion of the upstream return rail 24 where the horizontal portion 242 exists, the scraping member 12 is guided by the horizontal portion 242. Therefore, in this portion, the scraping member 12 does not hang down from the position of the horizontal portion 242 toward the bottom of the pond. Further, since the scraping member 12 does not hang down, the chain main body 101 does not hang down from the predetermined height to the bottom of the pond in the portion where the horizontal portion 242 exists.

As shown in FIG. 2, the scraping member 12 has a flight plate 121, a pair of return shoes 122, and a pair of regulating members 123. The flight plate 121 is made of stainless steel having a substantially U-shape when viewed in the width direction of the pond. The return shoe 122 and the regulating member 123 are attached to both ends of the flight plate 121 in the pond width direction in a line symmetry with respect to the center in the pond width direction. The regulating member 123 and the return shoe 122 are detachably fixed to the flight plate 121 by screws (not shown).

FIG. 3 is a cross-sectional view taken along the line BB of FIG. In FIG. 3, the scraping member 12, the upstream return rail 24, and the upstream pedestal 247 are shown.

As shown in FIG. 3, the upstream return rail 24 has an L-shape with the entire cross section turned upside down, and the sliding contact portion 240 and the mounting portion 241 of the upstream return rail 24 are integrally formed. There is. In the present embodiment, the cross-sectional shape of the upstream return rail 24 has the same shape over the entire length of the upstream return rail 24 in the longitudinal direction. The upstream return rail 24 is attached to both ends in the pond width direction in a line symmetry with respect to the center in the pond width direction. The mounting portion 241 of the upstream side return rail 24 is fixed to the upstream side pedestal 247 with a screw (not shown). The return shoe 122 is made of resin and is attached to the bottom side of the pond of the scraping member 12 located on the water surface track T4. The scraping member 12 located on the water surface track T4 returns on the upstream side when the shoe lower surface 122a of the return shoe 122 slides on the upper surface 240a of the sliding contact portion 240 which is the upper surface of the sliding contact portion 240 of the upstream return rail 24. It moves while being guided by the rail 24.

The regulating member 123 has a rectangular base portion 1231, a downward projecting portion 1232 projecting downward from the base portion 1231, and a pond width direction projecting portion 1233 projecting from the tip of the downward projecting portion 1232 in the pond width direction. The downward projecting portion 1232 and the pond width direction projecting portion 1233 are integrally formed stainless steel round bars, and are fixed to the base portion 1231 by being welded to the base portion 1231. Further, the downward projecting portion 1232 and the pond width direction projecting portion 1233 have an L shape in which the left and right sides are reversed as a whole. The pond width direction protrusion 1233 is below the sliding contact portion lower surface 240b, which is the lower surface of the sliding contact portion 240 of the upstream return rail 24, and is spaced vertically from the sliding contact portion 240 when viewed from above. It is arranged so as to face the sliding contact portion 240 so as to overlap the sliding contact portion 240.

The protruding end surface 1233a of the protruding portion 1233 in the pond width direction is arranged so as to face the mounting portion 241 at a distance from the side surface 241a of the mounting portion 241 of the upstream return rail 24 in the pond width direction. When sloshing occurs due to an earthquake and the water surface track portion 11a swings in the pond width direction, the protruding end surface 1233a of the pond width direction protruding portion 1233 of the regulating member 123 comes into contact with the side surface 241a of the mounting portion 241 of the upstream return rail 24. The contact between the side surface 241a of the mounting portion 241 and the protruding end surface 1233a prevents the scraping member 12 located on the water surface track T4 from swinging significantly in the pond width direction. That is, the protruding end face 1233a corresponds to an example of the lateral regulation portion.

In FIG. 3, one end side of the scraping member 12 in the pond width direction and the upstream return rail 24 on the one end side thereof are shown, but on the other end side of the scraping member 12 in the pond width direction. The regulating member 123 is arranged line-symmetrically with respect to the center in the width direction of the pond. Further, on the other end side in the pond width direction, the upstream return rail 24 is arranged line-symmetrically with respect to the center in the pond width direction. The regulating member 123 on one end side and the return rail 24 on the upstream side shown in FIG. 3 suppress the scraping member 12 located on the water surface track T4 from swinging significantly to the left side in FIG. On the other hand, the regulation member 123 on the other end side and the upstream return rail 24 on the other end side also prevent the scraping member 12 located on the water surface track T4 from swinging significantly to the right side in FIG.

Further, when the water surface track portion 11a swings upward, the protruding upper surface 1233b of the pond width direction protruding portion 1233 comes into contact with the sliding contact portion lower surface 240b of the upstream side return rail 24 from the pond bottom side. The contact between the lower surface 240b of the sliding contact portion and the protruding upper surface 1233b prevents the scraping member 12 located on the water surface track T4 from swinging significantly upward. That is, the protruding upper surface 1233b corresponds to an example of the upward regulating portion in the present invention.

In the present embodiment, the height distance L1 between the lower surface 240b of the sliding contact portion and the upper surface 1233b of the protrusion is set to 14 mm. The method of setting the interval L1 will be described later. Further, in the present embodiment, the overlapping width L2 of the pond width direction protrusion 1233 and the sliding contact portion 240 in the pond width direction is set to 20 mm. The overlapping width L2 may be a width equal to or greater than the value (here, 8 mm) obtained by subtracting the tooth thickness L4 (see FIG. 4) of the drive sprocket 14 from the chain inner dimension L3 (see FIG. 4) of the chain body 101. With this width, unless the endless chain is disengaged from the drive sprocket 14 or the intermediate sprocket 15, the pond width direction protrusion 1233 and the sliding contact portion 240 are hit when the scraping member 12 swings above the interval L1. Can be touched. In addition, in order to ensure that the protruding portion 1233 in the pond width direction and the sliding contact portion 240 are in contact with each other, it is preferable that the overlapping width L2 is at least twice the above value (L3-L4).

FIG. 4 is a cross-sectional view taken along the line CC of FIG. FIG. 4 is a cross-sectional view taken along a vertical line passing through the center of the drive sprocket 14. FIG. 4 shows a state in which the scraping member 12 is at the upper end of the drive sprocket 14. Further, the drive chain 211 shown in FIG. 1 is not shown. Note that FIG. 4 shows the upstream end face of the upstream return rail 24, and the upstream end face is hatched.

The link member 110 constituting the chain body 101 is composed of a pair of left and right link plates 111 facing each other in the pond width direction, and a barrel portion 112 connecting the pair of left and right link plates 111. If the lower end of the link plate 111 is located radially outside (upper in FIG. 4) of the tooth tip of the drive sprocket 14, the chain body 101 may come off from the drive sprocket 14. Further, if the lower end of the barrel portion 112 is located radially outside the tooth tip of the drive sprocket 14, the barrel portion 112 may ride on the tooth tip of the drive sprocket 14. In the present embodiment, the height distance L1 between the sliding contact portion lower surface 240b and the protruding upper surface 1233b is set to the overlap distance L5 (here, 46 mm) from the lower end of the link plate 111 to the tooth tip of the drive sprocket 14, and the barrel portion. The meshing distance from the lower end of the 112 to the tooth tip of the drive sprocket 14 is shorter than the meshing distance L6 (33 mm in this case). This reduces the risk of the chain body 101 coming off the drive sprocket 14 and the risk of the barrel portion 112 riding on the tooth tips of the drive sprocket 14. In order to more reliably reduce these risks, the interval L1 in the height direction is preferably an interval of half or less of the overlap distance L5, and more preferably an interval of half or less of the meshing distance L6. preferable.

As described above, the upstream end surface of the drive wheel side inclined portion 243 is on the vertical line of the drive wheel top portion at the upper end of the drive sprocket 14 when viewed in the pond width direction (on the same surface as the paper surface in FIG. 4). It is provided in. At the top of the drive wheels, the chain body 101 is wound around the drive sprocket 14. At the winding portion of the chain body 101 around the drive sprocket 14, there is almost no possibility that the chain body 101 will bend upward due to the drive load, and the behavior of the chain body 101 is likely to be stable. Further, since the portion of the chain body 101 wound around the drive sprocket 14 also has a frictional load with the drive sprocket 14, the possibility of bending upward is lower. In the present embodiment, since the drive wheel side inclined portion 243 extends to a portion where the chain main body 101 is unlikely to bend upward, the pond width direction protruding portion of the scraping member 12 attached to the winding portion. The 1233 can be reliably inserted below the sliding contact portion 240 of the upstream return rail 24.

Similarly, by providing the driven wheel side inclined portion 244, the pond width direction protruding portion 1233 of the scraping member 12 traveling in the reverse direction can also be surely inserted below the sliding contact portion 240.

Further, when the pond width direction protrusion 1233 is inserted below the sliding contact portion 240, the scraping member 12 is suppressed from moving upward and moves along the shape of the sliding contact portion 240. By suppressing the movement of the scraping member 12 attached to the water surface track portion 11a of the chain body 101 upward, the water surface track portion 11a is also suppressed from moving upward, and the water surface track portion 11a flexes upward. There is nothing wrong with it. As a result, the portion of the chain body 101 that passes through the drive wheel side inclined portion 243 and the driven wheel side inclined portion 244 does not bend upward and the winding angle around the drive sprocket 14 and the intermediate sprocket 15 does not decrease. The winding angle can be maintained. When the chain body 101 travels in the reverse direction, tension corresponding to the traveling load of the chain body 101 is applied to the water surface track portion 11a. At this time, the water surface orbit portion 11a tries to move upward due to tension, but the upward movement is suppressed by the sliding contact portion 240, so that the water surface orbit portion 11a is an orbit along the sliding contact portion 240. It moves in a cycle. That is, even when the chain body 101 travels in the reverse direction, the winding angle around the drive sprocket 14 and the intermediate sprocket 15 can be maintained. That is, the sliding contact portion 240 of the present embodiment also functions as a winding angle maintaining member that maintains the winding angle on the drive sprocket 14 and the intermediate sprocket 15.

As described above, according to the present embodiment, since the drive wheel side inclined portion 243 is provided, the pond width direction protruding portion 1233 of the scraping member 12 attached to the chain body 101 traveling in the normal direction is slid. It can be reliably inserted below the contact portion 240. By inserting the protruding portion 1233 in the pond width direction below the sliding contact portion 240, the effect of suppressing runout can be obtained. As a result, even if sloshing occurs due to an earthquake, it is possible to reliably prevent the chain body 101 from coming off from the drive sprocket 14 and the intermediate sprocket 15. Further, for the existing sludge scraping device, it is only necessary to replace the upstream return rail 24 and attach the regulating member 123 to the scraping member 12, so that sludge that can reliably prevent the chain body 101 from coming off at low cost. A scraping device can be provided.

Further, since the driven wheel side inclined portion 244 is provided, the pond width direction protruding portion 1233 of the scraping member 12 attached to the chain main body 101 is placed below the upstream return rail 24 even when traveling in reverse. , You can surely get in.

Subsequently, a modified example of the present embodiment will be described. In the following description, components having the same names as the components described so far will be described with the same reference numerals as those used so far. In addition, a description that overlaps with the description of the sludge scraping device that has already been described may be omitted.

FIG. 5 is a diagram showing a first modification of the present embodiment. FIG. 5 is a plan view of the vicinity of the drive sprocket 14 from above the settling basin 1. Further, in FIG. 5, the lower side of the figure is the upstream side, and the upper side of the figure is the downstream side.

In the previous embodiment, the cross-sectional shape of the upstream return rail 24 has the same shape over the entire length of the upstream return rail 24 in the longitudinal direction, but in the modified example, the upstream end of the drive wheel side inclined portion 243. The shape of the portion is different from that of the previous embodiment. As shown in FIG. 5, in the drive wheel side inclined portion 243 of this modified example, the width of the most upstream portion in the pond width direction is substantially the same as the thickness of the mounting portion 241. In addition, the width gradually widens from the portion on the upstream side toward the downstream side until it reaches a predetermined width, and after reaching the predetermined width, it extends toward the downstream side with a constant width. .. That is, the upstream end surface 240c of the drive wheel side inclined portion 243 of this modified example is an inclined surface inclined to the downstream side with respect to the pond width direction. The predetermined width is the same as the width of the sliding contact portion 240 in the pond width direction in the previous embodiment. By inclining the upstream end face 240c to the downstream side, even if the pond width direction protrusion 1233 collides with the upstream end face 240c, the pond width direction protrusion 1233 escapes in the pond width direction and collides. Since the force is dispersed, the possibility of damage to the upstream return rail 24 and the regulating member 123 can be reduced.

The driven wheel side inclined portion 244 also has the most downstream portion formed to have a width substantially the same as the thickness of the mounting portion 241 and faces the upstream side from the most downstream portion until it reaches a predetermined width. It may be gradually widened. By doing so, even if the driven wheel side inclined portion 244 and the pond width direction protruding portion 1233 collide with each other during reverse running, the possibility that the upstream side return rail 24 and the regulating member 123 are damaged can be reduced. Can be done.

FIG. 6 is a diagram showing a second modification of the present embodiment.

In the previous embodiment, the upstream return rail 24 having an L-shaped cross section that is turned upside down is used, and the sliding contact portion 240 also serves as a contact portion. In the second modification, a contact portion 249 projecting in the pond width direction is provided separately from the sliding contact portion 240. Further, in this modification, the downward protruding portion 1232 and the pond width direction protruding portion 1233 of the regulating member 123 are L-shaped as a whole. The protrusion 1233 in the pond width direction is below the lower surface of the contact portion 249a, which is the lower surface of the contact portion 249 of the upstream return rail 24, and is spaced vertically apart from the contact portion 249 of the upstream return rail 24. , It is arranged to face the contact portion 249 so as to overlap the contact portion 249 when viewed from above.

In this second modification, when the water surface track portion 11a swings upward, the protruding upper surface 1233b of the pond width direction protruding portion 1233 abuts on the lower surface 249a of the contact portion of the upstream return rail 24 from the pond bottom side. In this second modification, an example in which the contact portion 249 projecting in the opposite direction to the projecting direction of the sliding contact portion 240 in the pond width direction was provided, but in the same direction as the sliding contact portion 240. A protruding contact portion 249 may be provided. For example, the cross section of the upstream return rail 24 may be formed in an F-shape or an E-shape.

Subsequently, an example in which a so-called notch chain is used for the chain body will be described.

FIG. 7 (a) is a diagram showing a pinned sprocket used when a notch chain is used, and FIG. 7 (b) shows a part of the notch chain wound around the pinned sprocket shown in FIG. 7 (a). It is a figure which shows the state of being hung.

The pinned sprocket 81 shown in FIG. 7A is fixed to the drive shaft 141. A pin 812 is provided for each tooth 811 of the pinned sprocket 81. The pin 812 protrudes from each tooth 811 in the thickness direction of the pinned sprocket 81. As shown in FIG. 7B, the notch chain 83 is a chain in which a plurality of link members 830 are connected, like the metal chain body 101 shown in FIG. The link member 830 is made of resin and is composed of a pair of link plates 8301 facing in the pond width direction and a barrel portion 8302 connecting the link plates 8301. The link member 830 is provided with a notch portion 835. A pin 812 provided on the pinned sprocket 81 is engaged with the notch portion 835. When the notch portion 835 and the pin 812 are engaged, the rotational driving force of the pinned sprocket 81 is transmitted to the link member 830, and the notch chain 83 travels in the orbit. Further, every 20 link members 830 connected in the circulation direction of the notch chain 83, link members 830'provided with stays 8303 are arranged. A scraping member 12 is attached to the stay 8303.

When the notch chain 83 is used, the distance L1 in the height direction between the sliding contact portion lower surface 240b and the protruding upper surface 1233b shown in FIG. 3 is larger than the hooking height L8 between the notch portion 835 and the pin 812 shown in FIG. 7 (b). It is desirable to have a narrow interval. By doing so, the possibility that the notch portion 835 and the pin 812 will be disengaged is reduced. In order to surely reduce this risk, it is preferable that the interval L1 in the height direction is an interval of half or less of the catching height L8.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in the present embodiment, the return shoe 122 and the regulating member 123 are separate members, but the return shoe 122 may be provided with a downward projecting portion 1232 and a pond width direction projecting portion 1233, and the regulating member 123 may be omitted. Good. Further, the height of the mounting portion 241 may be changed in a part of the upstream return rail 24 in the longitudinal direction. Further, the pond width direction protrusion 1233 may be provided on the chain body 101.

It should be noted that even if the constituent requirements are included only in the description of each of the modified examples described above, the constituent requirements may be applied to other modified examples.

The sludge scraping device described so far is provided in a settling basin that receives water containing sludge and causes the sludge contained in the water to settle at the bottom of the pond while the water flows, and settles at the bottom of the pond. In a sludge scraping device that scrapes sludge with a scraping member that extends in the width direction of the pond.
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
It is provided with a rail member that extends in the direction of the water flow on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The scraping member is
The flight board extending in the width direction of the pond and
A shoe that slides into the rail member and
When the water surface side portion of the endless chain swings, it comes into contact with the rail member and includes a regulating member that regulates the swing of the endless chain.
The regulating member and the shoe are fixed to the flight plate in a stacked state.

Further, the sludge scraping device described so far is provided in a settling basin that receives water containing sludge and the sludge contained in the water settles at the bottom of the pond while the water flows, and is provided at the bottom of the pond. In a sludge scraping device that scrapes the settled sludge by a scraping member extending in the width direction of the pond.
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
It is provided with a rail member that extends in the direction of the water flow on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The scraping member is
The flight board extending in the width direction of the pond and
A shoe that slides into the rail member and
When the water surface side portion of the endless chain swings, it comes into contact with the rail member and includes a regulating member that regulates the swing of the endless chain.
The regulating member and the shoe are fixed to the flight plate in a state of being overlapped with each other.
The regulating member may be characterized in that the shoe is sandwiched between the regulation member and the flight plate and is detachably fixed to the flight plate.

Further, in this sludge scraping device, the regulating member may have an upward regulating portion that regulates the water surface side portion of the endless chain from swinging upward.

Further, in this sludge scraping device, the regulating member may have a lateral regulating portion that regulates the water surface side portion of the endless chain from swinging in the pond width direction.

Further, the sludge scraping device described so far is provided in a settling basin that receives water containing sludge and the sludge contained in the water settles at the bottom of the pond while the water flows, and is provided at the bottom of the pond. In a sludge scraping device that scrapes the settled sludge by a scraping member extending in the width direction of the pond.
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
It is provided with a rail member that extends in the direction of the water flow on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The scraping member is
The flight board extending in the width direction of the pond and
A shoe that slides into the rail member and
It is provided with a regulating member that regulates the runout of the endless chain.
The rail member has an L-shaped portion having an L-shaped cross section.
The regulating member may be characterized by having an L-shaped rod member that comes into contact with the L-shaped portion when the water surface side portion of the endless chain swings.

Further, the sludge scraping device described so far is provided in a settling basin that receives water containing sludge and the sludge contained in the water settles at the bottom of the pond while the water flows, and is provided at the bottom of the pond. In a sludge scraping device that scrapes the settled sludge by a scraping member extending in the width direction of the pond.
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
A rail member that extends in the direction of the water flow on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The endless chain is wound around the endless chain, and the endless chain is provided with a driving wheel that transmits a driving force to run the endless chain.
The scraping member is
The flight board extending in the width direction of the pond and
A shoe that slides into the rail member and
It is provided with a regulating member that regulates the runout of the endless chain.
The rail member has an L-shaped portion having an L-shaped cross section.
The regulating member has an L-shaped rod material that comes into contact with the L-shaped portion when the water surface side portion of the endless chain swings.
The endless chain is formed by connecting link members having a pair of link plates arranged at a distance in the pond width direction.
The L-shaped bar is composed of a downward projecting portion protruding downward and a pond width direction projecting portion projecting in the pond width direction.
The L-shaped portion is arranged so as to overlap the pond width direction protrusion and the pond width direction, and when the water surface side portion of the endless chain swings upward, the pond width direction protrusion abuts from the pond bottom side. It has a contact part and has a contact part.
The overlap width of the protrusion in the pond width direction and the contact portion in the pond width direction is equal to or greater than the value obtained by subtracting the tooth thickness of the drive wheel from the distance of the pair of link plates. ..

Further, in the sludge scraping device, the L-shaped bar may be made of stainless steel.

In addition, the sludge contained in the sludge is received and the sludge contained in the water is settled in the sedimentation basin while the water flows, and the sludge settled in the bottom of the pond extends in the width direction of the pond. In the sludge scraping device that scrapes by the scraping member
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
A drive wheel provided on the water surface side on the upstream side in the water flow direction in which the water flows, in which the endless chain is wound and a driving force is transmitted to the endless chain to run the endless chain.
A driven wheel provided on the water surface side on the downstream side in the water flow direction, around which the endless chain is wound, and which can rotate following the running of the endless chain.
It is provided with a rail member that extends in the water flow direction on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The scraping member has an upward regulating portion that abuts on the rail member from the pond bottom side when the water surface side portion swings upward.
The rail member has an abutting portion where the upward regulating portion abuts from the pond bottom side when the water surface side portion of the endless chain swings upward.
The abutting portion is a horizontal portion extending horizontally from the vicinity of the driving wheel toward the driven wheel, and the abutting portion is inclined upward from the drive wheel side end portion of the horizontal portion toward the upstream side in the water flow direction. It has a drive wheel side inclined portion, and has a drive wheel side inclined portion.
The inclined portion on the drive wheel side may be formed in an arc shape substantially along the pitch circle of the drive wheel.

The endless chain has slack between the driving wheels and the driven wheels. According to this sludge scraping device, a drive wheel side inclined portion is provided which is inclined upward from the vicinity of the drive wheels toward the upstream side in the water flow direction and is formed in an arc shape substantially along the pitch circle of the drive wheels. Therefore, even if there is the above-mentioned slack, the upward regulating portion can be surely inserted below the contact portion. By inserting the upward regulating portion below the contact portion, the effect of suppressing runout can be reliably obtained. As a result, it is possible to prevent the endless chain from coming off from the rotating wheel.

Further, the upward regulating portion may be provided on the bottom side of the pond with a vertical interval from the contact portion and face the contact portion.

Further, the inclined portion on the drive wheel side may extend from the end portion on the drive wheel side to the upstream side in the water flow direction beyond the position at the upper end of the drive wheel.

Further, the inclined portion on the drive wheel side may extend from the end portion on the drive wheel side to a position in front of the position at the upper end of the drive wheel on the upstream side in the water flow direction.

Further, the horizontal portion extends to the vicinity of the driven wheel.
The contact portion has a driven wheel side inclined portion that is inclined upward from the driven wheel side end portion of the horizontal portion toward the downstream side in the water flow direction when viewed in the pond width direction. You may.

Since the driven wheel side inclined portion inclined upward from the vicinity of the driven wheel toward the driven wheel side is provided, even when the water surface side portion of the endless chain runs from the driven wheel side to the drive wheel side, the contact portion The upward regulation part can be surely inserted downward.

Further, the drive wheels include a forward rotation drive in which the endless chain travels from the drive wheel side toward the driven wheel side, and a reverse rotation drive in which the endless chain travels toward the side opposite to the normal rotation drive. May be the one that does.

Further, the driven wheel side inclined portion may extend from the driven wheel side end portion to the downstream side in the water flow direction beyond the position at the upper end of the driven wheel.

Further, the driven wheel side inclined portion may extend from the driven wheel side end portion to a position before the upper end position of the driven wheel on the downstream side in the water flow direction.

1 Settling basin 1d Pond bottom 10 Sewage scraping device 11 Endless chain 12 Scraping member 14 Drive sprocket 15 Intermediate sprocket 24 Upstream return rail 240 Sliding contact part 242 Horizontal part 243 Drive wheel side inclined part 244 Driven wheel side inclined part 249 Contact part 1233a Protruding end face 1233b Protruding top surface W Water surface

Claims (2)

It is provided in a settling basin that receives water containing sludge and the sludge contained in the water settles at the bottom of the pond while the water flows. In a sludge scraping device that scrapes by members
An endless chain that has a plurality of the scraping members at intervals and circulates the scraping members on the bottom side of the pond and the water surface side by running.
A rail member that extends in the direction of the water flow on the water surface side and is in sliding contact with the pond bottom side of the scraping member when the endless chain travels.
The endless chain is wound around the endless chain, and the endless chain is provided with a driving wheel that transmits a driving force to run the endless chain.
The scraping member includes a shoe that is in sliding contact with the rail member and a regulating member that regulates the runout of the endless chain.
The drive wheels have teeth protruding in the radial direction.
The rail member has a sliding contact portion in contact with the shoe, and has a sliding contact portion.
The restricting member is arranged so as to overlap the sliding contact portion in the pond width direction with a downward interval from the sliding contact portion, and when the water surface side portion of the endless chain swings upward, the sliding contact portion is subjected to. It has a pond width direction protrusion that abuts and protrudes in the pond width direction.
The endless chain is formed by connecting link members having a pair of link plates arranged at a distance in the pond width direction.
The sludge scraping device is characterized in that the distance is shorter than the overlap distance from the lower end of the link plate constituting the link member to the tip of the tooth in a state where the teeth of the drive wheel and the link member are in mesh with each other. .. The sludge scraping device according to claim 1, wherein the interval is not more than half of the overlap distance.

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