JP2015205275A - Sludge scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge scraper which prevents detachment of an endless chain from a rotation wheel without sacrificing scraping ability of sludge, in relation to the sludge scraping device which is disposed in a sedimentation basin allowing sludge contained in received water to be sedimented on a basin bottom part and scrapes the sludge sedimented on the basin bottom part with a flight plate.SOLUTION: An endless chain 31 has a plurality of connection pins 313 and a plurality of link members 310 provided with through-holes and is made by inserting the connection pins 313 into the through-holes between the link members 310 and connecting the link members 310 to each other. Therein, the prescribed connection pins of the number more than the number of flight plates 32 attached to the endless chain 31 are protruded such that an edge part thereof is brought into contact with a guide member 342 by shaking due to an earthquake and the guide member 342 has an extension part extended in a tangential direction of the sprocket 34.

Description

  The present invention relates to a sludge scraping device that is provided in a sedimentation basin in which sludge contained in received water settles at the bottom of a pond, and that sludges settled on the bottom of the pond by a flight board.

  As the sludge scraping device, a flight plate is attached to an endless chain partially wrapped around a drive wheel or a driven wheel, and the flight plate is circulated by rotating the drive wheel, and the sludge is scraped by the flight plate. Are known.

  By the way, when an earthquake or the like occurs, the water in the sedimentation basin shakes greatly. In a sedimentation basin in which a sludge scraping device with a flight plate attached to an endless chain is installed, the endless chain may come off from a rotating wheel such as a driving wheel or a driven wheel due to a large shaking of water in the pond.

  Conventionally, a guide member is arranged in the radial direction of the rotating wheel, and the guide member is opposed to the end portion of the endless chain that is wound around the rotating wheel at an interval from the radial direction. Proposals have been made to prevent the endless chain from coming off by causing the endless chain winding portion to come into contact with the guide member when the endless chain winding portion is likely to come off the rotating wheel in the radial direction due to shaking (for example, patents). Reference 1 or 2 etc.). As described above, the flight plate is attached to the endless chain. The flight plate attached to the endless chain protrudes from the endless chain in the radial direction of the rotating wheel. For this reason, when a flight board passes a rotating wheel, a flight board and the guide member arrange | positioned at the radial direction of a rotating wheel will interfere. Therefore, the flight plate described in the above-mentioned patent document is provided with a notch from the projecting tip edge toward the endless chain in order to avoid interference with the guide member. This notch is provided at a position where it interferes with the guide member, and when the flight plate passes through the rotating wheel, the guide member is accommodated in the notch and the flight plate and the guide member interfere with each other. There is no.

JP 2006-326383 A JP 2011-5400 A

  However, at the position where the notch is provided on the flight board, the sludge is removed when the flight board draws up the sludge, and the sludge collecting apparatus described in the above patent document draws up the important sludge. Notches are particularly hindered.

  Further, in the sludge scraping device described in the above-mentioned patent document, it is effective as a countermeasure against the possibility that the endless chain winding part is likely to come off radially from the rotating wheel due to shaking due to an earthquake or the like. This is insufficient as a countermeasure against the possibility of coming off from the rotating wheel in the axial direction of the rotation center axis of the rotating wheel.

  In view of the above circumstances, an object of the present invention is to provide a sludge scraping device that can prevent the endless chain from being removed from the rotating wheel without sacrificing the sludge scraping ability.

The first sludge scraping device of the present invention that solves the above-mentioned object is as follows.
In the sludge scraping device that is provided in a sedimentation basin in which the sludge contained in the received water settles on the bottom of the pond, and the sludge that has settled on the bottom of the pond is scraped by a flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
Of the plurality of connection pins, the predetermined number of predetermined connection pins larger than the number of the flight plates attached to the endless chain is such that the end on one side is the guide at the position where the guide member is disposed. The member is spaced from the connecting pin in the radial direction, and protrudes from the link member to a position where it overlaps the guide member when viewed from above so that the end abuts against the guide member due to an earthquake swing. And
The guide member has an extending portion extending in a tangential direction of the rotating wheel.

In addition, in the sludge scraping device that is provided in a sedimentation basin in which the sludge contained in the received water settles at the bottom of the pond, and the sludge settled on the bottom of the pond is scraped by a flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
A part of the plurality of connection pins, the number of the projecting connection pins being greater than the number of the flight plates attached to the endless chain, the one side at the position where the guide member is disposed The end portion of the connecting member is spaced from the guide member in the radial direction of the connecting pin, and when viewed from above, the end portion is moved from the link member to a position where it overlaps the guide member due to an earthquake. Projecting to abut,
Of the plurality of connecting pins, the connecting pins excluding the protruding connecting pins are shorter than the protruding connecting pins,
The guide member may be arranged at a position deviating from the radial direction of the rotating wheel.

Furthermore, in the sludge scraping device that is provided in the sedimentation basin where the sludge contained in the received water settles on the pond bottom, and the sludge settled on the pond bottom is scraped by the flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
Of the plurality of connection pins, the predetermined number of predetermined connection pins larger than the number of the flight plates attached to the endless chain is such that the end on one side is the guide at the position where the guide member is disposed. The member may be characterized in that it is spaced from the connecting pin in the radial direction and protrudes from the link member to a position overlapping the guide member when viewed from above.

  According to the sludge squeezing device, when the endless chain winding portion is likely to come off from the rotating wheel in a radial direction due to an earthquake or the like, the peripheral surface of the protruding end of the predetermined connecting pin comes into contact with the guide member. Derailment is prevented. In other words, the predetermined connecting pin protrudes from the link member such that the protruding portion comes into contact with the guide member due to shaking due to an earthquake or the like. In addition, the guide member is disposed at a position on at least one side of the rotating wheel in the axial direction, and is disposed at a position deviating from the radial direction of the rotating wheel. Therefore, the flight board is not required to be cut out, and the sludge scraping ability is not lowered.

  In the sludge scraping device, the number of the predetermined connection pins may be larger than the number of the flight plates, and all the connection pins connecting the link members constituting the endless chain are connected to the predetermined connection pins. Although it is not necessary to use a pin, as the number of the predetermined connecting pins increases, the probability that the protruding end of the connecting pin abuts on the guide member due to shaking due to an earthquake or the like increases.

  In addition, the guide member is disposed at each position on both sides of the rotating wheel in the axial direction, and both ends of the predetermined connecting pin are overlapped with the guide member when viewed from above. The aspect which protrudes from the said link member is preferable. The central axis and the connecting pin are in a parallel or substantially parallel relationship. According to this aspect, both ends of the predetermined connecting pin abut against the guide member due to shaking due to an earthquake, etc., and the connecting pin can be kept parallel to the central axis of the rotating wheel without the connecting pin being inclined, The endless chain is reliably prevented from being removed from the rotating wheel.

  The connecting pin may have a protruding tip portion protruding from the link member having a thickness equal to or smaller than the diameter of the through hole.

  The connecting pin has a position restricting member longer than the diameter of the through hole, and the position restricting member restricts the position in the extending direction in which the connecting pin extends, and the position restricting member extends the link. What protruded in the opposite direction to the member by the length of 5 mm or more and 30 mm or less may be sufficient. That is, the connecting pin may have a length from the position regulating member to the protruding tip of 5 mm or more and 30 mm or less. Moreover, the part which protruded from the said position control member of the said connection pin may be the thickness below the diameter of the said through-hole.

The second sludge scraping device of the present invention that solves the above-mentioned object is as follows.
In the sludge scraping device that is provided in a sedimentation basin in which the sludge contained in the received water settles on the bottom of the pond, and the sludge that has settled on the bottom of the pond is scraped by a flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
The guide member is characterized in that the endless chain has an extending portion that is disposed at an interval in the extending direction in which the connecting pin extends and extends in a tangential direction of the rotating wheel. To do.

In addition, in the sludge scraping device that is provided in a sedimentation basin in which the sludge contained in the received water settles at the bottom of the pond, and the sludge settled on the bottom of the pond is scraped by a flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
Of the plurality of connection pins, a part of the connection pins that is larger in number than the number of the flight plates attached to the endless chain, the at least one end of the connection pins is from the link member. In the extending direction in which the connecting pin extends, the end protrudes so as to come into contact with the guide member due to shaking due to an earthquake,
Of the plurality of connecting pins, the connecting pins excluding the protruding connecting pins are shorter than the protruding connecting pins,
The guide member may be disposed at a position deviating from the radial direction of the rotating wheel and spaced from the endless chain in the extending direction.

Furthermore, in the sludge scraping device that is provided in the sedimentation basin where the sludge contained in the received water settles on the pond bottom, and the sludge settled on the pond bottom is scraped by the flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
The guide member may be arranged such that the endless chain is spaced apart in the extending direction in which the connecting pin extends.

  According to the sludge squeezing device, when the endless chain winding portion is likely to be detached from the rotating wheel in the axial direction of the central axis due to an earthquake or the like, the end surface of the connecting pin or the link member contacts the guide member. Contact and wheel removal are prevented. That is, the guide member is arranged so that the end surface of the connecting pin or the link member abuts from the extending direction due to a shake due to an earthquake or the like. In addition, the guide member is disposed at a position on at least one side of the rotating wheel in the axial direction, and is disposed at a position deviating from the radial direction of the rotating wheel. Therefore, notches are not required in the flight board, and the sludge scraping ability is not reduced.

  In addition, it is preferable that the guide member is disposed on both sides of the rotating wheel in the axial direction with the endless chain being spaced apart in the extending direction. According to this aspect, it is possible to reliably cope with the above-described axial vibration, and the endless chain is reliably prevented from being removed from the rotating wheel.

  Moreover, in any sludge scraping device of any of the above-described sludge scraping devices and the second sludge scraping device, the flight plate extends in the width direction of the settling basin, and both end portions in the width direction are It may be attached to the endless chain.

Moreover, in the sludge scraping device, the connecting pin is a member protruding at least one side from the link member by a predetermined length in the extending direction,
The guide member may be arranged on the one side with an interval of the predetermined length or less in the extending direction from the endless chain.

  By doing so, the end surface of the connecting pin or the link member comes into contact with the guide member more reliably from the axial direction due to shaking due to an earthquake or the like.

  According to the sludge scraping apparatus of the present invention, it is possible to prevent the endless chain from being removed from the rotating wheel without sacrificing the sludge scraping ability.

It is a top view which shows an example of the sedimentation basin in which the sludge scraping device which is one Embodiment of this invention was installed. It is the figure which showed the AA cross section of FIG. 1 typically. It is a figure which shows typically a mode when the part wound around the sprocket rotating centering | focusing on the intermediate shaft shown in FIG. 2 in an endless chain is seen from upper direction. FIG. 3 is an enlarged view of a sprocket that rotates about a drive shaft shown in FIG. 2 as a rotation center. It is the figure which looked at the mode when a sprocket is cut | disconnected by the A-A 'cutting line shown in FIG. 4 from the downstream of a sedimentation basin. (A) is a figure which shows a mode that the link member in which the stay was provided is meshing with the sprocket, (b) is a figure which shows the modification of this embodiment. (A) is the figure which looked at the resin chain from the upper part, (b) is the figure which looked at the resin chain shown to (a) from the side. (A) is a figure which shows the sprocket with a pin which rotates with a drive shaft, (b) is a figure which shows the sheave wheel which rotates with respect to an intermediate shaft, a tail shaft, and a driven shaft. It is a schematic diagram which shows a mode that a part of notch chain was wound on the sprocket with a pin shown to Fig.8 (a).

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

  FIG. 1 is a plan view showing an example of a sedimentation basin 1 in which a sludge scraping device 10 according to an embodiment of the present invention is installed. FIG. 2 is a diagram schematically showing the AA cross section of FIG. In FIG. 1, the sludge scraping device 30 shown in FIG. 2 is omitted.

  The sedimentation pond shown in FIG. 1 is a rectangular pond extending in a predetermined direction (left to right in FIG. 1), and accepts sewage such as sewage and rainwater from one end side (left side in FIG. 1) in the extending direction. Then, the sludge contained in the received sewage is precipitated on the pond bottom 1d and drained from the other end side (right side in FIG. 1). Hereinafter, the left direction in FIG. 1 may be referred to as an upstream direction, and the right direction in FIG. 1 may be referred to as a downstream direction. Also, the vertical direction in FIG. 1 may be referred to as the width direction.

  As shown in FIG. 1, the sedimentation basin 1 is a pond having a substantially rectangular shape in plan view, surrounded by a pair of side walls 1a, upstream walls 1b, and downstream walls 1c provided on both sides of the pond width direction. .

  As shown in FIG. 2, the sedimentation basin 1 is provided with a scum removing device 10, a sludge scraping device 30 according to this embodiment, a drainage basin 40, and a sludge pit 50. The drainage basin 40 is provided on the downstream side of the sedimentation basin 1, and the sludge pit 50 is provided on the upstream side of the sedimentation basin 1.

  The sludge scraping device 30 of the present embodiment is provided at each of both ends of the sedimentation basin 1 in the pond width direction, and is spanned between a pair of endless chains 31 that travel in the sedimentation basin 1 and the pair of chains 31. A plurality of flight plates 32 are provided. The endless chain 31 is an annular chain that forms a circular track in which a track along the pond bottom 1d and a track along the water surface W are connected. Flight plates 32 are attached to the endless chain 31 that is annular in a circumferentially spaced manner over the entire circumference. In FIG. 2, the endless chain 31 is indicated by the above-described orbit.

  Sprockets 34 to 37 are arranged in the vicinity of the upstream end and the downstream end of the track along the pond bottom 1d and in the vicinity of the upstream end and the downstream end of the track along the water surface W. These sprockets 34 to 37 are arranged on the inner side of the orbit, and a part of the endless chain 31 is wound around each of the sprockets 34 to 37, and the sprockets 34 to 37 of the endless chain 31 are wound around the sprockets 34 to 37. The wound portion is meshed with the sprockets 34 to 37.

  A drive shaft 341 is fixed to the central portion of the sprocket 34 disposed near the upstream end of the track along the water surface W so as not to rotate. The drive shaft 341 is rotated by a motor (not shown), so that the sprocket 34 is rotated. Also rotate. In other words, the sprocket 34 is a driving wheel that transmits the driving force of a motor (not shown) and causes the endless chain 31 to travel. The sprocket 34 shown in FIG. 2 is driven to rotate clockwise, and the endless chain 31 also runs clockwise. On the other hand, the other sprockets 35 to 37 are driven wheels that rotate as the endless chain 31 travels. Fixed shafts 351, 361, and 371 are passed through the central portions of the sprockets 35 to 37 of the driven wheels. All of the sprockets 35 to 37 of the driven wheels are rotatable with respect to the fixed shafts 351, 361, 371, and the shafts 351, 361, 371 are fixedly arranged so as not to rotate around the shaft.

  Each of the sprockets 34 to 37 corresponds to an example of a rotating wheel referred to in the present invention. Each of the sprockets 34 to 37 rotates around the drive shaft 341 and the fixed shafts 351, 361, 371, and the drive shaft 341, the fixed shafts 351, 361, 371 are the central shafts referred to in the present invention. It corresponds to an example. Further, in the following description, the central axis passed through the sprocket 35 of the driven wheel disposed near the downstream end of the track along the water surface W is referred to as an intermediate shaft 351, and near the downstream end of the track along the pond bottom 1d. The shaft that is passed through the sprocket 36 of the driven wheel disposed in the shaft is referred to as a tail shaft 361, and the shaft that is passed through the sprocket 37 of the driven wheel disposed near the upstream end on the opposite side is sometimes referred to as a driven shaft 371. .

  Further, the drive shaft 341, the intermediate shaft 351, the tail shaft 361, and the driven shaft 371 shown in FIG. 2 all extend in a direction perpendicular to the paper surface, and in the axial direction in which these shafts extend. Guide members 342, 352, 362, and 372 are disposed on both sides of each sprocket 34 to 37. A detailed description of the guide members 342, 352, 362, and 372 will be described later.

  When the endless chain 31 travels, the flight plate 32 travels along the track along the pond bottom 1d from the downstream side toward the upstream side, and the sludge that has settled on the pond bottom 1d is transferred to the upstream sludge pit 50 by the flight plate 32. Scraped. The sludge scraped to the sludge pit 50 is discharged to the outside of the sedimentation basin 1 by a sludge pump (not shown).

  The scum removing device 10 includes a weir 11, a trough 12, and a scum pit 16 (see FIG. 1). The trough 12 is fixed at a predetermined height position from the pond bottom 1d. The trough 12 extends across the settling basin 1 in the pond width direction to a scum pit 16 (see FIG. 1) provided outside the settling basin 1. A predetermined water level higher than the upper edge of the upstream wall 121 of the trough 12 shown in FIG. 2 extending in the pond width direction is the lowest water level of the sedimentation basin 1. The weir 11 is connected to the trough 12 by a connecting member 13 so as to be rotatable with respect to the trough 12 with the lower end as a rotation center. The weir 11 changes its state between a weir state in which the upper end is located above the water surface W and a swallowed state in which the upper stage is submerged in water. The weir 11 shown in FIG. 2 is in a dammed state. When the upper end of the weir 11 in the dammed state is pushed down by a drive mechanism (not shown), the weir 11 rotates about the lower end as a rotation center and enters a swallowed state. The weir 11 prevents the water in the settling basin 1 from flowing into the trough 12 in the blocked state, whereas the water in the settling basin 1 flows into the trough 12 in the swallowed state.

  Scum is floating on the water surface W of the sedimentation basin 1. When the endless chain 31 travels, the flight plate 32 travels on the track along the water surface W from the upstream side toward the downstream side, and the scum that floats on the water surface W of the settling basin 1 is directed toward the weir 11 in the indented state. It is transferred by the flight plate 32. The scum flows into the trough 12 with the water in the settling basin 1 over the upper end of the weir 11 which is in a stagnation state. The bottom of the trough 12 is inclined downward toward the scum pit 16 outside the sedimentation basin 1, and the scum mixed water mixed with the scum reaches the scum pit 16 shown in FIG. 1 through the trough 12. The scum pit 16 is provided with a pump 161. This pump 161 pumps up the scum mixed water accumulated in the scum pit 16.

  The water in the sedimentation basin 1 passes under the trough 12, flows from the drainage basin 40 to a drainage channel (not shown), and is drained to the outside of the sedimentation basin 1.

  FIG. 3 is a diagram schematically showing a state of the endless chain as viewed from above a portion wound around a sprocket that rotates around the intermediate shaft shown in FIG. In FIG. 3, the sprocket 35 is omitted, but a part of the intermediate shaft 351 is shown.

  The endless chain 31 shown in FIG. 3 includes a link member 310 in which a pair of link plates 311 facing in the pond width direction (left and right direction in FIG. 3) are connected by a barrel portion 312 having a through hole extending in the pond width direction. It is a metal chain formed by connecting with connecting pins 313. That is, it has a plurality of connecting pins 313 and a plurality of link members 310 provided with through holes, and is formed by inserting the connecting pins 313 into the through holes of the link members 310 and connecting the link members 310 to each other. It is. More specifically, the through-holes in the barrel portion 312 of the link member 310 located on the downstream side are provided in the through-holes provided in the downstream side portions of the pair of link plates 311 located on the upstream side in the circumferential direction of the endless chain 31. In a state in which the connecting pins 313 are combined, the connecting pins 313 are inserted into these through holes, and the connecting pins 313 are fixed from the outside of the pair of link plates 311 with nuts 3131 for preventing them from coming off. The connecting pin 313 fixed by the nut 3131 cannot rotate with respect to the link plate 311. The nut 3131 is a position restricting member for restricting the position of the connecting pin 313 in the extending direction. Each end portion of the connecting pin 313 further protrudes outward from the nut 3131 in the direction opposite to the link member 310. The diameter of the portion of the connecting pin 313 that protrudes further outward from the nut 3131 is equal to or smaller than the diameter of the through hole of the link member 310. In addition, it replaces with the nut 3131 and the aspect which arrange | positioned the head larger than the diameter of a through-hole in the one end side of the connection pin 313, and has arrange | positioned the prevention pin which is longer than the diameter of a through-hole in the other end side. It may be. This also restricts the position of the connecting pin 313 in the extending direction. Moreover, the retaining pin prevents the connecting pin 313 from rotating with respect to the link plate 311. In this aspect, the connecting pin 313 protrudes further outward from the head and protrudes further outward from the retaining pin.

  The teeth of the sprockets 34 to 37 enter between the pair of link plates 311. In the sprocket 34 that rotates together with the drive shaft 341, the rotation driving force of the sprocket 34 is transmitted to the link member 310 by engaging the edge on the downstream side in the rotation direction of the teeth with the barrel portion 312, and the endless chain 31 travels on the circular track. . In addition, the track | orbit which tied the end of the adjacent connection pin 313 of the endless chain 31 shown in FIG.

  As shown in FIG. 3, the extending direction in which the intermediate shaft 351 extends and the axial direction in which the connecting pin 313 extends are parallel to or substantially parallel to the pond width direction. The guide members 352 are disposed along the endless chain on both sides of the sprocket 35 (not shown) in the axial direction of the intermediate shaft 351. The guide member 352 is an L-shaped plate member whose cross section in the vertical direction (perpendicular to the paper surface in FIG. 3) is turned upside down. The longitudinal direction of the guide member 352 is the circumferential direction of the endless chain. The portion having the pond width direction as the short direction is referred to as a connecting pin radial direction restricting portion 3521, and the portion having the pond width direction as the thickness direction is extended to the connecting pin. This is referred to as a direction restriction part 3522. In FIG. 3, the surface of the connecting pin radial direction restricting portion 3521 is shown.

  All the connection pins 313 included in the endless chain 31 shown in FIG. 3 protrude from the link member 310 to a position where the guide member 352 overlaps with the guide member 352 when viewed from above. That is, both end portions of the connecting pin 313 overlap the connecting pin radial direction restricting portion 3521 as indicated by dotted lines. Note that both end portions of the connecting pin 313 are arranged at intervals in the radial direction of the connecting pin radial direction restricting portion 3521 and the connecting pin 313, which will be described later.

  Further, the connecting pin extending direction restricting portion 3522 of the guide member 352 shown in FIG. 3 is arranged with an interval S1 from the endless chain 31 in the extending direction of the connecting pin 313. In the present embodiment, the distance S1 exceeds the assumption even if the winding portion of the endless chain 31 is likely to come off from the sprocket 35 in the axial direction of the intermediate shaft 351 due to an earthquake or the like. When the movement in the axial direction is performed, the end surface 313a of the connecting pin 313 is in contact with the connecting pin extending direction restricting portion 3522, and is designed at an interval that can prevent the wheel from being removed. In other words, the connecting pin extending direction restricting portion 3522 in the present embodiment is arranged so that the end surface 313a of the connecting pin 313 comes into contact with the extending direction due to shaking due to an earthquake or the like.

  The description of the guide member 352 described above is common to the other guide members 342, 362, and 372.

  FIG. 4 is an enlarged view of a sprocket that rotates around the drive shaft shown in FIG. In FIG. 4, an endless chain 31 having a plurality of connecting pins 313 and a plurality of link members 310 is shown. In FIG. 4, the direction perpendicular to the paper surface is the pond width direction, the axial direction in which the drive shaft 341 extends, and the extending direction in which the connecting pin 313 extends. In FIG. 4, an example of the radial direction of the connecting pin 313 is indicated by a thin arrow.

  A part of the endless chain 31 shown in FIG. 4 is wound around the sprocket 34, but most of the part is just a connecting pin extending direction restricting portion 3422 of the guide member 342 arranged on one side of the sprocket 34. Hidden in. FIG. 4 also shows a flight plate 32. In the present embodiment, a link member 310 provided with a stay 3101 is arranged every four link members 310 connected in the circumferential direction of the endless chain 31. The flight plate 32 is a plate member having a U-shaped cross section extending in the pond width direction. As described above, the endless chain 31 is disposed at each of both ends of the pond width direction. The endless chain 31 disposed on one end side in the pond width direction and the endless chain 31 disposed on the other end side in the same direction form the same circular orbit and both ends of the flight plate 32 extending in the pond width direction. Each part is attached to the stay 3101 of the link member 310 in the endless chain 31 disposed at each of both ends of the pond width direction via attachment members 3102. Therefore, the number of all the connection pins 313 included in the endless chain 31 is larger than the number of flight plates 32 attached to the endless chain 31.

  FIG. 5 is a view of the state when the sprocket is cut along the A-A ′ cutting line shown in FIG. 4 as viewed from the downstream side of the settling basin. Therefore, in FIG. 5, the back side of the paper is the upstream side of the settling basin. In FIG. 5, only the portion of the endless chain 31 that meshes with the 12 o'clock position of the sprocket 34 is shown, and the other portions are not shown. Further, the flight plate 32 is not shown.

  The drive shaft 341 shown in FIG. 5 is bridged between a bearing 3411 provided on one side wall 1a of the sedimentation basin 1 and a bearing provided on the other side wall not shown in FIG. Yes. Further, a pedestal 61 is provided on the side wall 1 a of the sedimentation basin 1 at a position avoiding the circular track of the endless chain 31 and the flight plate 32, and the guide members 342 disposed on both sides of the sprocket 34 are provided with the pedestal 61. In addition, it is attached by an attachment member 611.

  FIG. 5 shows that the guide member 342 is an L-shaped plate member that is turned upside down. Further, as shown in FIG. 5, both end portions of the connection pin 313 are disposed with a space S <b> 2 in the radial direction of the connection pin 313 with respect to the connection pin radial direction restriction portion 3421 of the guide member 342. In the present embodiment, the distance S <b> 2 is determined so that the circumferential surface 313 b at the end of the connecting pin 313 is restricted in the connecting pin radial direction when the winding portion of the endless chain 31 is likely to come off from the sprocket 34 due to shaking due to an earthquake or the like. It is designed to have an interval that abuts against the portion 3421 and can prevent the wheel from being removed. In other words, the connecting pin 313 protrudes from the link member 310 so that the protruding portion comes into contact with the connecting pin radial direction restriction portion 3421 due to shaking due to an earthquake or the like.

  FIG. 5 also shows a state in which the connecting pin extending direction restricting portion 3422 of the guide member 342 is arranged with an interval S1 from the endless chain 31 in the extending direction of the connecting pin 313. . The endless chain 31 with a long circumference may take unexpected behaviors such as, for example, the connecting pin 313 is lifted while being inclined due to a shake due to an earthquake or the like. By providing, it is possible to reliably prevent the endless chain 31 from coming off the sprocket 35. In particular, when the distance S2 is long, or when the connecting pin radial direction restricting portion 3421 is omitted, the connecting pin extending direction restricting portion 3422 is effective.

  The description of the guide member 342 described with reference to FIGS. 4 and 5 is common to the other guide members 352, 362, and 372.

  The guide member 342 and the like described above are arranged at positions deviating from the radial positions of the sprockets 34 to 37, and the protruding portion of the connecting pin 313 protruding from the link member 310 is the extension of the connecting pin 313. They are spaced apart both in the direction and in the radial direction. That is, the connecting pin radial direction restricting portion 3421 and the like face the peripheral surface 313b of the protruding portion of the connecting pin 313 with a gap from the radial direction, and the connecting pin extending direction restricting portion 3422 and the like are connected to the connecting pin 313. It faces the end surface 313a of the protruding portion with a gap from the extending direction.

  FIG. 6A is a diagram illustrating a state where the link member 310 provided with the stay 3101 is engaged with the sprocket 34. Also in FIG. 6A, the back side of the paper is the upstream side of the settling basin.

  As described above, the guide member 342 is disposed at a position away from the radial position of the sprocket 34, and the flight plate 32 is positioned in the radial direction. As shown in FIG. 6 (a), the flight plate 32 protrudes in the radial direction of the sprocket 34, the protruding tip edge 32a is flat, is not provided with any cutouts, etc. I can stir it firmly.

  Further, as described above, the connecting pin 313 is fixed to the link member 310 by the nut 3131, and the protruding length L of the connecting pin 313 from the nut 3131 to the protruding tip is preferably 5 mm or more and 30 mm or less. When the protruding length L is less than 5 mm, the length of the end of the connecting pin that contacts the connecting pin radial direction restricting portion 3421 is too short, and the endless chain 31 is prevented from being removed in the sprocket radial direction. It becomes difficult. On the other hand, if the protruding length L exceeds 30 mm, dust or the like may be caught on the protruding portion of the connecting pin 313, which may hinder the collection of sludge. Further, the connecting pin extending direction restricting portion 3422 of the guide member 342 is disposed with an interval S1 from the endless chain 31 in the extending direction of the connecting pin 313. The length of the interval S1 is the above-described protruding length. The length is L or less. By doing so, the end surface 313a of the connecting pin 313 comes into more reliable contact with the connecting pin extending direction restricting portion 3422 from the extending direction by shaking due to an earthquake or the like.

  Furthermore, in the above description, when the end portion of the endless chain 31 is likely to be detached from the sprocket 34 in the axial direction of the drive shaft 341 (not shown here) due to shaking due to an earthquake or the like, the end surface 313a of the connection pin 313 is connected to the connection pin. Although the interval S <b> 1 is provided so as to contact the extending direction restricting portion 3422, the interval S <b> 3 may be determined so that the link member 310 contacts the guide member 342 instead of the end surface 313 a of the connecting pin 313. . That is, as shown in FIG. 6A, the connecting pin radial direction restricting portion 3421 of the guide member 342 is bent 90 degrees from the connecting pin extending direction restricting portion 3422, and the tip faces the link member 310. The distance S3 in the extending direction between the link member 310 and the tip of the connecting pin radial direction restricting portion 3421 is greater than the distance S1 in the extending direction between the end surface 313a of the connecting pin 313 and the connecting pin extending direction restricting portion 3422. The link member 310 may come into contact with the distal end of the connecting pin radial direction restricting portion 3421 by a narrow interval and by shaking due to an earthquake or the like. Alternatively, the interval S3 and the interval S1 may be the same length.

  Instead of the connecting pin 313, a plate-like protruding piece may be protruded from the link member 310. However, the guide member 342 is a plate member and is not so thick. In order to suppress an increase in the weight of the endless chain 31, it is preferable that the protruding piece is thin. For this reason, when the protruding piece comes into contact with the connecting pin radial direction restricting portion 3421 due to shaking due to an earthquake or the like, both of the plate-like shape are bent, and the protruding piece exceeds the connecting pin radial direction restricting portion 3421 and the protruding piece is in the radial direction of the sprocket 34. You should be aware that there is a risk of jumping out.

  FIG. 6B is a diagram illustrating a modification of the present embodiment.

  In this modification, the guide member 342 is arranged only on one end side in the thickness direction of the sprocket 34. The connecting pin 313 also protrudes from the nut 3131 only on the side where the guide member 342 is provided. A roller 3132 is provided on the protruding portion of the connecting pin 313. The roller 3132 is made of an elastic material, and is rotatably attached to the connecting pin 313. As described above, the connecting pin 313 fixed by the nut 3131 is not rotatable with respect to the link member 310. By providing this rotatable roller 3132, the frictional resistance when the connecting pin 313 contacts the connecting pin radial direction restricting portion 3421 is reduced.

  Further, the connecting pin radial direction restricting portion 3421 in this modified example is bent 90 degrees from the connecting pin extending direction restricting portion 3422, and the tip end portion 3421 a is bent further 90 degrees toward the connecting pin 313. As a result, the roller 3132 having a diameter larger than the diameter of the connecting pin 313 is surrounded by the guide member 342 in a state where the roller 3132 is spaced in the extending direction of the connecting pin 313. In this way, even if the guide member is provided only on one side, it is possible to cope with whether the winding portion of the endless chain 31 is likely to come off from the sprocket 34 toward the axial direction of the drive shaft 341. .

  The interval between the outer periphery of the roller 3132 and the connecting pin radial direction restricting portion 3421 opposed to the outer periphery of the roller 3132 is shorter than the interval between the bent tip portion 3421a of the connecting pin radial direction restricting portion 3421 and the connecting pin 313. When the winding portion is about to come off from the sprocket 34 in the radial direction, the roller 3132 comes into contact with the connecting pin radial direction restricting portion 3421.

  Next, an example in which a resin chain is used as an endless chain will be described.

  Fig.7 (a) is the figure which looked at the resin chain from upper direction, The figure (b) is the figure which looked at the resin chain shown to the figure (a) from the side.

  As with the metal chain shown in FIG. 3, this resin chain 71 also has a barrel portion in which a pair of link plates 711 facing the pond width direction (vertical direction in FIG. 7) have through holes extending in the pond width direction. A chain formed by connecting link members 710 connected by 712 with connecting pins 713. In the resin chain 71 shown in FIG. 7, a head 7131 larger than the diameter of the through hole is provided on one end side of the connecting pin 713 instead of the nut, and a diameter larger than the diameter of the through hole is provided on the other end side. A horseshoe-shaped retaining pin 7132 having a horseshoe shape is arranged to restrict the position of the connecting pin 713 in the extending direction. Further, the retaining pin 7132 also functions as a detent pin that restricts the connection pin 713 from rotating relative to the link member 710. The heads 7131 and the retaining pins 7132 are provided alternately in the circumferential direction of the resin chain 71. The link member 710 shown on the rightmost side is provided with a stay 7101. The flight plate 32 is also attached to the stay 7101 via an attachment member (not shown). The resin chain 71 travels from the left to the right in the figure.

  In this resin chain 71, the connecting pin 713 further protrudes from the head 7131 in the direction opposite to the link member 710 at every other link member 310 connected in the circumferential direction of the resin chain 71, and from the retaining prevention pin 7132. It further protrudes in the direction opposite to the link member 710. That is, the connection pin 713 inserted in the through hole on the downstream side in the circumferential direction of the link member 710 shown on the rightmost side and the connection inserted in the through hole on the downstream side in the circumferential direction of the link member 710 shown on the leftmost side. The pins 713 protrude from both sides of the connecting pin 713 in the extending direction.

  The sprockets 34 to 37 and the guide members 342, 352, 362, and 372 described so far are also applied to the resin chain 71 shown in FIG.

  Next, an example in which a so-called notch chain is used as an endless chain will be described.

  As with the metal chain shown in FIG. 3, the notch chain is also connected by a connecting pin to a link member in which a pair of link plates facing in the pond width direction are connected by a barrel portion having a through hole extending in the pond width direction. This is a resin chain. The link member is provided with a notch portion, and a pin provided on the sprocket is engaged with the notch portion, whereby the rotational driving force of the sprocket is transmitted to the link member, and the notch chain travels on the circular track.

  FIG. 8A is a view showing a sprocket 81 with a pin that rotates together with the drive shaft 341.

  The sprocket 81 with a pin shown in FIG. 8 rotates clockwise. Each tooth 811 of the sprocket 81 with a pin is provided with a pin 812 at a position on the downstream side in the rotation direction. This pin 812 protrudes in the thickness direction of the sprocket 81 with a pin.

  FIG. 8B is a view showing a sheave wheel 82 that rotates with respect to the intermediate shaft 351, the tail shaft 361, and the driven shaft 371.

  A sheave wheel 82 shown in FIG. 8 is provided in place of the sprockets 35 to 37. A protruding strip 821 that enters between a pair of link plates is provided at the central portion of the thickness surface of the sheave wheel around which the notch chain is wound.

  FIG. 9 is a schematic view showing a state in which a part of the notch chain 83 is wound around the pin sprocket 81 shown in FIG. The sprocket 81 with a pin shown in FIG. 9 is driven to rotate clockwise.

  9 includes a plurality of connecting pins 833 and a plurality of link members 830 provided with through holes, and the link pins 833 are inserted into the through holes between the link members 830 to connect the link members 830 to each other. A part of the notch chain 83 is shown. In the notch chain 83, the connection pins 833 protrude from the two link members 830 connected in the circumferential direction of the notch chain 83 on both sides in the extending direction of the connection pins 833. In FIG. 9, the connecting pin 833 protrudes from the link member 830 on the upstream side in the rotation direction of the sprocket 81 with the pin. The link member 830 on the upstream side in the rotation direction is provided with a stay 8301, and the flight plate 32 is attached to the stay 8301 via an attachment member 8302.

  Furthermore, the notch part 835 is provided in the link member 830, and the pin 812 of the sprocket 81 with a pin is engaged with the notch part 835 shown in FIG.

  In addition, guide members 842 are disposed on both sides of the sprocket 81 with the pin, and the connecting pin radial direction restricting portion 8421 is spaced from the peripheral surface of the protruding portion of the connecting pin 833 from the radial direction of the connecting pin 833. The connecting pin extending direction restricting portion 8422 faces the end surface 833a of the protruding portion of the connecting pin 833 with a gap from the extending direction of the connecting pin 833.

  According to the sludge scraping device 30 described above, it is possible to prevent the endless chain 31 from being removed from various sprockets or sheaves without sacrificing the sludge scraping ability.

  In the above description, either one or both of the four sprockets 34 to 37 shown in FIG. 2 and the like, the sprocket 81 with a pin shown in FIG. 8A, and the sheave wheel 82 shown in FIG. Although the guide member is arranged on the side, any one or more of the four sprockets 34 to 37, one of the sprockets 81 with a pin, and one of the three sheave wheels 82 or more rotations You may arrange | position a guide member only to a ring | wheel.

  The guide member may have only one of the connecting pin radial direction restricting portion and the connecting pin extending direction restricting portion.

DESCRIPTION OF SYMBOLS 1 Sedimentation basin 1d Pond bottom 30 Sludge scraping device 31 Endless chain 310 Link member 313 Connection pin 32 Flight board 34, 35, 36, 37 Sprocket 341 Drive shaft 351 Intermediate shaft 361 Tail shaft 371 Drive shaft 342, 352, 362, 372 Guide Member 3421 Connecting pin radial direction restricting portion 3422 Connecting pin extending direction restricting portion

Claims (2)

In the sludge scraping device that is provided in a sedimentation basin in which the sludge contained in the received water settles on the bottom of the pond, and the sludge that has settled on the bottom of the pond is scraped by a flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
Of the plurality of connection pins, the predetermined number of predetermined connection pins larger than the number of the flight plates attached to the endless chain is such that the end on one side is the guide at the position where the guide member is disposed. The member is spaced from the connecting pin in the radial direction, and protrudes from the link member to a position where it overlaps the guide member when viewed from above so that the end abuts against the guide member due to an earthquake swing. And
The sludge scraping device, wherein the guide member has an extending portion extending in a tangential direction of the rotating wheel. In the sludge scraping device that is provided in a sedimentation basin in which the sludge contained in the received water settles on the bottom of the pond, and the sludge that has settled on the bottom of the pond is scraped by a flight board,
An endless chain in which a track along the bottom of the pond and a track on the upper side of the track are connected to each other, and a plurality of the flight plates are attached at intervals;
A plurality of rotating wheels in which a central axis is disposed at a plurality of locations inside the endless chain, and a part of the endless chain is wound around each of the rotating shafts and rotates around the central axis.
A guide member disposed at a position on at least one side of the rotating wheel in the axial direction in which the central axis extends,
The endless chain has a plurality of connecting pins and a plurality of link members provided with through holes, and is formed by inserting the connecting pins through the through holes of the link members and connecting the link members to each other. Because
The guide member is characterized in that the endless chain has an extending portion that is disposed at an interval in the extending direction in which the connecting pin extends and extends in a tangential direction of the rotating wheel. Sludge collecting device.

Images