JP6042716B2 - Sludge scraping device - Google Patents

Description

  The present invention relates to a sludge scraping device that scrapes sludge deposited in a sedimentation basin and deposited on the bottom of the pond in one direction.

  The sludge scraping device moves with the traveling of the endless chain, a pair of endless chains wound between a plurality of support shafts including a drive shaft, a plurality of flight plates attached to the endless chain. It has a long guide rail that supports the flight plate, and is configured to scrape the sludge accumulated on the bottom of the settling basin with the flight plate.

  When the endless chain wound around the sprocket provided on the support shaft travels along with the rotation of the sprocket, the flight plate attached to the endless chain circulates and moves in the settling basin. When the flight board moves on the guide rail installed at the bottom of the sedimentation basin, the sludge accumulated on the bottom of the pond is scraped and the flight board moves on the guide rail installed near the water surface of the sedimentation basin. The scum that floats on the surface of the water is raked.

Japanese Patent Laid-Open No. 10-57713

  By the way, when a large earthquake occurs in the area where the sedimentation basin is installed, the sloshing phenomenon in which the water in the sedimentation basin is greatly swollen due to the long-period vibration caused by the earthquake, and the endless chain is detached from the sprocket of the support shaft due to the influence. The sludge scraping device may be damaged.

  Therefore, not only the new sedimentation basin but also the sludge scraping device installed in the existing sedimentation basin, in order to prevent the endless chain from detaching from the sprocket due to sloshing phenomenon etc. It has been considered that a long presser member that prevents the flight plate from floating is disposed along the extending direction of the guide rail on the side facing the guide rail.

  In this case, when the separation distance between the flight plate and the holding member is long, the endless chain cannot be prevented from being separated. When the separation distance between the flight plate and the holding member is short, the flight plate and the holding member are Smooth running of the endless chain is hindered due to sliding or the like, which may cause damage to the endless chain.

  In view of the above-described problems, the object of the present invention is to define the relative positional relationship between the flight plate and the pressing member that can prevent the endless chain from being unexpectedly removed while ensuring smooth running of the endless chain. It is in providing a sludge scraping device.

  In order to achieve the above-mentioned object, the first characteristic configuration of the sludge scraping device according to the present invention is a pair of endless wound around a plurality of support shafts as described in claim 1 of the claims. Sludge accumulated on the pond bottom of a settling basin, comprising a chain, a plurality of flight plates attached to the endless chain, and a long guide rail that supports the flight plate that moves as the endless chain travels A sludge scraping device that scrapes the flight plate with the flight plate, and a holding member that prevents the flight plate from being lifted is disposed on the side facing the guide rail across the flight plate, and the pair of endless chains are It is wound around a sprocket fixed to both ends of each spindle, and the separation distance h1 between the flight plate and the pressing member is 0 with respect to the maximum height H between the valley and the peak of the sprocket. In that it is set in a range of 25H ≦ h1 ≦ 0.75H.

  If the endless chain is separated from the sprocket by more than the maximum height H between the valley and the peak of the sprocket, the possibility that the endless chain is detached from the sprocket becomes extremely high. Therefore, if the separation distance h1 between the flight plate and the holding member is adjusted to at least the range of 0.25H ≦ h1 ≦ 0.75H, the endless chain even when a large fluid pressure acts on the endless chain and the flight plate. Since the endless chain does not come off from the sprocket before it is released from the sprocket above the maximum height H, and the flight plate comes into contact with the presser member during normal travel of the endless chain. Smooth running is not prevented and the endless chain is not damaged.

  In addition to the first characteristic configuration described above, the second characteristic configuration is the endless chain wound around the sprocket of the driving support shaft disposed in the upper layer of the settling basin. On the other hand, the distance h1 between the flight plate and the pressing member in the far region separated from the driving support shaft by a predetermined distance L or more is greater than the maximum height H between the valley and the peak of the sprocket. Thus, the distance h2 between the flight plate and the pressing member is set to a range of 0.25H ≦ h1 ≦ 0.75H, and the distance h2 between the flight plate and the pressing member is h1 in the vicinity of the predetermined distance L from the driving support shaft. <H2 ≦ H + α, α = 0.1H.

  The endless chain that is pulled by the rotation of the sprocket of the driving spindle and pushed downstream is supported by a guide rail installed on the upstream or downstream side of the driving spindle through the flight plate while moving on an endless track. Circulate. The length of the endless chain is slightly longer than the shortest length of the endless track formed between the support shafts, so that the endless chain bends downward until it is supported by the guide rail from the drive support shaft. .

  Temporarily, the distance h1 is set in a range of 0.25H ≦ h1 ≦ 0.75H with respect to the maximum height H between the valley and the peak of the sprocket in a far region separated from the driving support shaft by a predetermined distance L or more. If the same region is set in the vicinity of the drive shaft by a predetermined distance L, for example, the inclined surface of the boundary between the valley and the peak of the sprocket and the engaging portion of the endless chain are When the endless chain rises along the inclined surface due to the contact, the flight plate and the pressing member may come into contact with each other and stable running of the endless chain may be impaired.

Therefore, by setting the separation distance h2 between the flight plate and the pressing member in the vicinity of the predetermined distance L from the driving support shaft within the range of h1 <h2 ≦ H + α, α = 0.1H, even if when the endless chain is or ride further up along the edge, a stable running is ensured of the endless chain.

In the third feature configuration, in addition to the second feature configuration described above, the separation distance h2 in the vicinity region toward the far region where the endless chain is fed out , in addition to the second feature configuration described above. Is set to gradually approach the separation distance h1.

  With this configuration, it is possible to effectively prevent the endless chain from detaching from the sprocket when an earthquake occurs while ensuring stable travel of the endless chain during normal times.

  In the fourth feature configuration, as described in claim 4, in addition to the second or third feature configuration described above, the pressing member is separated in a region corresponding to each of the near region and the far region. The presser members are connected to each other at the boundary between the near area and the far area.

  If the presser member is formed integrally in the area corresponding to each of the near area and the far area, it is necessary to perform bending work corresponding to each area, but the position and degree of bending vary depending on the site. It is difficult to process in advance, and it is very difficult to bend on site. However, if the presser members are configured separately in the areas corresponding to the respective presser members, the presser members can be connected while adjusting the support positions of the presser members at the site, so that the assembling work is very easy.

In the fifth feature configuration, in addition to any of the first to fourth feature configurations described above, the presser member is supported so that the separation distance from the flight plate can be adjusted. A support mechanism that is fixed directly or indirectly to the wall surface of the settling basin and arranged to protrude to the presser member side, and the presser member between the support member And a fixing mechanism for fixing the mounting member between the support member and the pressing member, and the fixing mechanism is a mounting position of the mounting member on the pressing member side. The distance between the flight plate and the presser member and the support position of the presser member supported by the mounting member along the extending direction of the presser member are adjustable.

According to the above-described configuration, after the support member is directly or indirectly fixed to the wall portion of the settling basin so as to protrude toward the press member, the press member is fixedly supported to the support member via the attachment member. At this time, the mounting position of the mounting member on the side of the pressing member, the distance between the flight plate and the pressing member, and the supporting position of the pressing member supported by the mounting member along the extending direction of the pressing member can be adjusted. Since the fixing mechanism is provided, the pressing member can be accurately fixed and supported at a desired position even if the mounting accuracy of the supporting member itself is somewhat poor. Therefore, complicated construction work at the site for accurately installing the support member and the like during construction for installing the support mechanism is greatly reduced, and the relative positional relationship between the flight plate and the presser member is also accurate. You can adjust it.

In the sixth feature configuration, as described in claim 6, in addition to the fifth feature configuration described above, the attachment member includes a first fixing mechanism capable of adjusting an attachment position on the holding member side. The first attachment member attached to the support member via the support member, and the support member supported by the first attachment member along the distance between the flight plate and the holding member and the extending direction of the holding member . It is in the point comprised by the 2nd attachment member which fixes the said pressing member to the said 1st attachment member via the 2nd fixing mechanism which can adjust a position.

  According to the above-described configuration, the first mounting member is fixed to the support member while being adjusted via the first fixing mechanism so that the position of the pressing member facing the flight plate becomes a predetermined position, and the flight plate and the pressing member are further fixed. If the second mounting member is fixed to the first mounting member while being adjusted via the second fixing mechanism so that the separation distance from the head becomes a predetermined distance, the presser member is desired even if the mounting accuracy of the support member itself is somewhat poor. It becomes possible to fix and support at a precise position.

  In the seventh characteristic configuration, as described in claim 7, in addition to the sixth characteristic configuration described above, the pressing member is configured by an angle member having an L-shaped cross section, and the second mounting member is In the state where the holding member is sandwiched between the engaging portion that engages with one side end of the angle member, and the engaging portion and the first mounting member, the first distance can be adjusted. And a fixing portion that is fastened to the mounting member.

  Even if the presser member is composed of a long and heavy angle member, the engaging part of the second mounting member is engaged with one side end of the angle member to sandwich the presser member with the first mounting member. The angle member can be supported while adjusting the position easily by tightening the fixing portion adjusted to the predetermined distance via the second fixing mechanism to the first mounting member. There is no need to drill holes for fixing or the like, and the construction can be performed very easily. Moreover, the extension direction can be easily adjusted by sliding the pressing member.

  In the eighth feature configuration, in addition to any of the fifth or sixth feature configuration described above, the pressing member is arranged along the extending direction of the guide rail. The pipe member is configured to prevent the flight plate from being lifted, and the holding member that holds the pipe member on one end side and is held on the attachment member on the other end side.

  By constructing the presser member with a pipe member, the strength can be maintained while reducing the weight, so that a sufficient presser function is exhibited while improving workability.

  In the ninth feature configuration, in addition to any of the fifth to eighth feature configurations described above, in addition to the above-described fifth to eighth feature configurations, the fixing mechanism is a long hole formed in one of the two members, It is in the point comprised with the volt | bolt and nut which tighten after positioning both members through the said long hole.

  Since the fixing mechanism is prepared in advance so that the relative position of both members to be tightened can be easily adjusted via the long hole, even if the mounting accuracy of the support member is somewhat lowered, it can be adjusted with high accuracy. It can be immediately tightened and fixed with bolts and nuts, and can be flexibly handled in the field.

  According to the tenth feature configuration, in addition to any one of the first to ninth feature configurations described above, a guide shoe that slides on the guide rail is provided above and below the flight plate. The restraining member is positioned at a position facing the guide shoe on the opposite side to the guide shoe that is attached to both surfaces and slides on the guide rail by the support mechanism.

  Of the guide shoes attached to the upper and lower surfaces of the flight board, the restraining member is positioned at a position opposite to the guide shoe on the opposite side of the guide shoe sliding on the guide rail, so that a sloshing phenomenon due to an earthquake appears. Even if the flight plate moves upward, the guide shoe with a certain level of strength comes into contact with the restraining member, so it is possible to avoid the occurrence of a situation where the flight plate, which is weaker than the guide shoe, is damaged. can do. Even if the guide shoe is damaged, the guide shoe can be replaced.

  The eleventh characteristic configuration is arranged in the lower layer from the support shaft arranged in the upper layer of the settling basin, in addition to any one of the first to tenth characteristic configurations described above. The endless chain is wound around the support shaft, and the restraining member is disposed at least on the endless chain wound around the support shaft disposed in the upper layer.

  When the sloshing phenomenon occurs, the water on the upper layer of the sedimentation basin is swollen so that a large fluid pressure acts on the endless chain and the flight plate. The chain is easy to come off. Therefore, by disposing the restraining member on at least the endless chain wound around the support shaft disposed in the upper layer, it is possible to effectively prevent the endless chain from being detached from the support shaft.

  As described above, according to the present invention, the sludge scraper capable of prescribing the relative positional relationship between the flight plate and the holding member that can prevent the endless chain from being unexpectedly removed while ensuring smooth running of the endless chain. It is now possible to provide a shifting device.

(A) is a longitudinal cross-sectional view of the sludge scraping device according to the present invention installed in the sedimentation basin, (b) is scraped by each sludge scraping device shown in (a) in each sedimentation basin arranged in parallel. Sectional view of the sludge scraping device that scrapes the sludge further in one direction Explanatory drawing of the sludge scraping device by this invention Explanatory drawing of the main part of one end of the flight board of the sludge scraping device (A)-(d) is explanatory drawing of the support mechanism by this invention (A) is an explanatory view of the main parts of the sprocket and endless chain attached to the drive spindle, (b) is a front view of the connecting part of the pressing member, showing the part indicated by the circle of the one-dot chain line (a) Explanatory drawing of (c) is explanatory drawing of the same sectional view, (d) is principal part explanatory drawing of a sprocket (A), (b), (c) is explanatory drawing of the separation distance of a flight board and a pressing member. The other embodiment is shown, (a), (b) is a main part explanatory view of the mounting position of the guide shoe and the endless chain of one end of the flight board of the sludge scraping device Explanatory drawing of the support mechanism which shows another embodiment FIG. 4 shows another embodiment, and (a) to (d) are explanatory views of a support mechanism according to the present invention FIG. 4 shows another embodiment, and (a) to (d) are explanatory views of a support mechanism according to the present invention

Hereinafter, a sludge scraping apparatus according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 (a) and 2, the sludge scraping device 2 is installed, for example, in a settling basin 1 such as a first settling basin or a final settling basin of a sewage treatment plant, and a plurality of support shafts 3a, 3b, 3c. Supports a pair of endless chains 4, 4 wound between 3d, a plurality of flight plates 5 attached to the endless chains 4, 4, and a flight plate 5 that moves as the endless chains 4, 4 travel. Long guide rails 6 and 7 are provided.

  The four support shafts are composed of support shafts 3a and 3b arranged in the upper layer of the sedimentation basin 1 and support shafts 3c and 3d arranged in the lower layer. More specifically, a driving support shaft 3a connected by a drive motor M and a drive chain C, an idler support shaft 3b arranged at the same height as the driving support shaft 3a, a take-up support shaft 3c, It is composed of an underwater support shaft 3d and is rotatably supported by bearings disposed at both ends.

  A sprocket S is attached to each end of each support shaft 3a, 3b, 3c, 3d via a key so as to rotate integrally with each support shaft 3a, 3b, 3c, 3d. Chains 4 and 4 are wound. The driving support shaft 3a is further provided with a driving sprocket Sd for winding the driving chain C described above.

  Flight plates 5 are attached to the endless chains 4 and 4 at predetermined intervals. When the driving support shaft 3a rotates, the endless chains 4 and 4 travel so as to circulate around the support shafts 3a, 3b, 3c and 3d, and the flight plate 5 attached to the endless chains 4 and 4 moves to the settling basin 1. Circulate in the interior.

  When the flight board 5 is supported by the guide rails 6 and 6 laid on the pond bottom and travels on the pond bottom side of the settling basin 1, the sludge accumulated on the pond bottom side is scraped to the sludge reservoir 1 a by the flight board 5. When the flight board 5 is supported by the guide rails 7 and 7 installed in the upper layer and travels on the water surface side, the scum floating on the water surface is raked to the scum skimmer 1b.

  The scum skimmer 1b includes an overflow weir that allows the scum scraped by the flight plate 5 to flow into the trough, and the overflow weir is pushed down as the flight plate 5 travels and floats on the water surface. The scum is configured to flow into the trough with water.

  The support shafts 3b, 3c, and 3d are driven shafts, and the take-up support shaft 3c is arranged so that the position of the take-up support shaft 3c can be adjusted back and forth along the traveling direction of the flight plate 5, and the tension of the endless chains 4 and 4 can be adjusted. It is configured as follows.

  The guide rails 7 and 7 installed between the support shafts 3a and 3b in the upper layer of the sedimentation basin 1 are arranged along the extending direction of the endless chains 4 and 4, and anchors are attached to the side walls 1c of the sedimentation basin 1 at predetermined intervals. It is fixedly supported by the upper part of the several rail support member 70 comprised with the corrosion-resistant steel materials fixed via (refer FIG. 3).

  As shown in FIGS. 1 (a) and 1 (b), a plurality of such sedimentation basins 1 are installed in parallel, and the sludge scraped to the sludge reservoir 1a by each sludge scraping device 2 is the second sludge. It is scraped to one side of the sludge storage part 1a by the scraping device 20 and discharged by the pump P to the outside of the tank.

  Similar to the sludge scraping device 2 described above, the second sludge scraping device 20 is also attached to the pair of endless chains 24, 24 wound between the support shafts 23a, 23b, 23c and the endless chains 24, 24. And a long guide rail 27 that supports the flight plate 25 that moves as the endless chains 24 and 24 travel.

  Note that a corrosion-resistant metal such as resin or stainless steel is preferably used as the material for the endless chain or guide rail described above, and wood, resin or a corrosion-resistant metal is preferably used as the material for the flight plate.

  When a large earthquake occurs in the area where the sedimentation basin 1 is installed, a sloshing phenomenon in which the water in the sedimentation basin 1 is greatly swollen due to long-period vibration due to the earthquake appears. The endless chain may be detached from the sprocket and be damaged.

  Therefore, as shown in FIGS. 1 to 4, a long presser made of an angle member having an L-shaped cross section that prevents the flight plate 5 from floating on the side facing the guide rail 7 across the flight plate 5 The member 8 is arranged along the extending direction of the guide rail 7 via the support mechanism 9. Note that the presser member 8 does not have to be long, and in that case, a fixed presser member 8 may be connected. Further, the regular pressing member 8 may be disposed in places at some distance. Details will be described below.

  3 and 4A to 4D, the support mechanism 9 includes a plurality of support members 9A arranged at predetermined intervals along the extending direction of the presser member 8, and the presser member 8 supports the support mechanism 9A. The first mounting member 9B and the second mounting member 9C for positioning and fixing the presser member 8 to the support member 9A are provided so as to be supported by the member 9A. In FIG. 3, reference numeral 4 indicates an endless chain, and reference numeral 5 c indicates an attachment portion of the endless chain 4 to the flight plate 5.

  9A of support members are comprised with the corrosion-resistant steel materials fixed to the wall surface (side wall) 1c of the sedimentation basin 1 via an anchor at predetermined intervals, and are arrange | positioned so that it may protrude to the pressing member 8 side. 9 A of support members are not restricted to the aspect fixed directly to the side wall 1c, You may employ | adopt the aspect fixed indirectly. For example, the rail support member 70 described above may be bolted or welded. In the latter case, the rail support member 70 and the support member 9A are arranged in pairs on the wall surface of the sedimentation basin 1 with a predetermined interval. Even if the support member 9A is directly fixed to the side wall 1c, the support member 9A may be installed at the same interval as the rail support member 70 (see FIGS. 7A and 7B).

  The first attachment member 9B is attached to the support member 9A via a first fixing mechanism 91 that can adjust the attachment position on the holding member 8 side, and the second attachment member 9C is attached to the presser via the second fixing mechanism 92. The member 8 is fixed to the first attachment member 9B. The second fixing mechanism 92 is configured to be capable of adjusting the separation distance h1 between the flight plate 5 and the pressing member 8 and the support position of the first attachment member 9B with respect to the extending direction of the pressing member 8.

  More specifically, the first mounting member 9B is composed of a plate-shaped steel material having a “T” shape in cross-sectional view, and the longitudinal direction of the rectangular plate-shaped steel material serving as the upper side, that is, the extending direction of the guide rail in a plan view. Long holes 91h are formed at two locations along the plate-like steel material extending in the vertical direction. The bolt 91a is inserted into the attachment hole formed in the support member 9A and the long hole 91h, and is fastened and fixed by the nut 91b. That is, the first fixing mechanism 91 is configured by the long hole 91h, the bolt 91a, and the nut 91b.

  9C of 2nd attachment members are comprised by the plate-shaped steel material by which the bending process was carried out, the engaging part 92a engaged with the one side end of the holding member 8 of a cross sectional view "L" shape, the engaging part 92a, and the 1st The holding position of the first mounting member 9B with respect to the distance h1 between the flight plate 5 and the pressing member 8 and the extending direction of the pressing member 8 can be adjusted in a state in which the pressing member 8 is sandwiched between the first mounting member 9B. And a fixing portion 92b to be fastened to the first mounting portion 9B.

  Of the first mounting member 9B, a long hole 92h extending in the vertical direction is formed in the hanging portion to which the fixing portion 92b is attached, and the long hole 92h formed in the first mounting member 9B and the attachment formed in the fixing portion 92b. Bolts 92c are inserted into the holes and fixed with nuts 92d. That is, the second fixing mechanism 92 is configured by the long hole 92h, the bolt 92a, and the nut 92b. FIG. 4 (d) shows an example in which one long hole 92h is formed, but actually two long holes 92h are formed in the width direction.

  According to the configuration described above, it is very difficult to install a support mechanism for accurately supporting a heavy presser member, particularly when the side wall of the pond is corroded in an existing sedimentation basin, etc. This requires not only extensive repair work on the side walls, but also the problem that it is very difficult to accurately fix the support mechanism to such side surfaces, and the distance between the flight plate and the presser member And the problem that it is necessary to accurately adjust the position of the pressing member facing the flight plate.

  That is, after the support member 9A is fixed directly or indirectly to the wall of the settling basin 1 so as to protrude toward the presser member 8, the position where the presser member 8 faces the flight plate 5 becomes a predetermined position. The first mounting member 9B is fixed to the support member 9A while being adjusted via the one fixing mechanism 91. Further, the separation distance h1 between the flight plate 5 and the pressing member 8 is set to a predetermined distance, and the holding member 8 The second mounting member 9C is fixed to the first mounting member 9B while being adjusted via the second fixing mechanism 92 so that the second mounting member 9C is slid in the extending direction to adjust the support position for the first mounting member 9B. Then, even if the mounting accuracy of the support member 9A itself is somewhat poor, the presser member 8 can be fixed and supported at a desired position with high accuracy.

  Since the mounting members 9B and 9C in which the fixing mechanisms 91 and 92 are prepared in advance are used so that the relative positions of both members to be tightened can be easily adjusted via the long holes 91h and 92h, the support member 9A Even if the mounting accuracy is somewhat reduced, it can be fastened with bolts and nuts immediately after positioning and positioning with high accuracy, and can be flexibly handled on site.

  Even if the presser member 8 is formed of a long and heavy angle member, the engaging portion 92a of the second mounting member 9C is engaged with one side end of the presser member 8 and the first mounting portion 9B. The clamp member 8 is sandwiched between the two fixing mechanisms 92 and the fixing portion 92b adjusted so that the separation distance h1 becomes a predetermined distance via the second fixing mechanism 92 is fastened to the first mounting member 9B, thereby easily adjusting the position. Since the presser member 8 can be supported, there is no need to perform fixing hole processing or the like on the presser member 8 at the site, and the presser member 8 can be constructed very easily.

  Further, guide shoes 5 a that slide on the guide rail 7 are attached to the upper and lower surfaces of the flight plate 5, and are opposed to the guide shoe 5 b opposite to the guide shoe 5 a that slides on the guide rail 7 by the support mechanism 9. The restraining member 8 is positioned at the position to be. The guide shoe 5b is disposed at a position facing the guide rail 6 when the flight plate 5 slides on the guide rail 6 laid on the pond bottom. The guide shoe is made of a material that is stronger than the flight plate 5, such as a casting or a hard resin.

  Of the guide shoes 5a and 5b attached to the upper and lower surfaces of the flight plate 5, the restraining member 8 is positioned at a position facing the guide shoe 5b opposite to the guide shoe 5a sliding on the guide rail 7. Even if a sloshing phenomenon due to an earthquake appears and the flight plate 5 moves upward, the guide shoe 5b having a certain degree of strength comes into contact with the restraining member. It is possible to avoid the occurrence of a situation that causes damage. Also, if the guide shoe is damaged, it can be replaced.

  When the sloshing phenomenon occurs, the water on the upper layer side of the sedimentation basin becomes larger, and a large fluid pressure acts on the endless chains 4, 4 and the flight plate 5. Therefore, the sloshing phenomenon is disposed in the upper layer than the support shaft disposed in the lower layer. The endless chain is easily detached from the support shaft.

  Therefore, as described above, when the holding member 8 is disposed at least on the endless chains 4 and 4 wound around the support shafts 3a and 3b disposed in the upper layer, the endless chain 4 is effectively separated from the support shaft. Can be prevented from leaving.

  The installation position of the holding member 8 is not limited to the position corresponding to the endless chains 4 and 4 wound around the support shafts 3a and 3b arranged in the upper layer, but is wound around the support shafts 3c and 3d arranged in the lower layer. You may arrange | position in the position corresponding to the turned endless chains 4 and 4. FIG.

  The separation distance h1 between the flight plate 5 and the pressing member 8 is set to a range of 0.25H ≦ h1 ≦ 0.75H with respect to the maximum height H between the valley and the peak of the sprocket S. preferable.

  As shown in FIGS. 5A and 5D, when the endless chain 4 is separated upward from the sprocket S beyond the maximum height H of the valley Sv and the peak Sp of the sprocket S, the endless chain 4 becomes sprocket S. Leave.

  Therefore, as shown in FIG. 6A, if the separation distance h1 between the flight plate 5 and the pressing member 8 is adjusted to at least 0.25H ≦ h1 ≦ 0.75H, the endless chain 4 and the flight Even when a large fluid pressure is applied to the plate 5, the endless chain 4 does not come off the sprocket S because the endless chain 4 comes into contact with the presser member 8 before coming off the sprocket S beyond the maximum height H. In particular, it is preferable to set h1 = 0.5H. In the figure, reference numeral T1 indicates a trajectory of the endless chain 4, reference numeral T2 indicates a trajectory of the flight plate 5, and reference numeral T3 indicates a tip line of the pressing member 8.

  Further, when the endless chain 4 is traveling normally, the flight plate 5 abuts against the presser member 8 so that smooth travel is prevented and the endless chain 4 is not damaged. The separation distance h1 between the flight plate 5 and the presser member 8 is the shortest distance from the tip of the presser member 8 to the flight plate 5, and in the above example in which the presser member 8 and the guide shoe 5b are arranged to face each other, This is the shortest distance between the pressing member 8 and the guide shoe 5b. Further, the pressing member 8 is not necessarily arranged at a position facing the guide shoe 5b.

  Further, as shown in FIG. 6B, a predetermined distance L from the driving support shaft 3a with respect to the endless chain 4 wound around the sprocket S of the driving support shaft 3a disposed in the upper layer of the settling basin 1. The distance h1 between the flight plate 5 and the presser member 8 is set in a range of 0.25H ≦ h1 ≦ 0.75H and is separated from the driving support shaft 3a by a predetermined distance L on the far side from the position separated by a distance. If the separation distance h2 between the flight plate 5 and the pressing member 8 is set in the range of h1 <h2 ≦ H + α, α = 0.1H, the smooth operation of the endless chain 4 and the flight plate 5 Can be realized. In the figure, reference numeral T1 indicates a trajectory of the endless chain 4, reference numeral T2 indicates a trajectory of the flight plate 5, and reference numeral T3 indicates a tip line of the pressing member 8. When H is a size of several tens of mm, it may be set in a range of h1 <h2 ≦ h1 + β, 0 mm ≦ β ≦ 10 mm. Furthermore, when it is set in the range of h1 <h2 ≦ H + α, the endless chain 4 can be effectively prevented from detaching from the sprocket.

  The endless chain 4 pushed out by the sprocket S of the driving support shaft 3a is fed downstream from the driving support shaft 3a without applying a large tension, and thereafter supported by the guide rail 7 via the flight plate 5. . Therefore, the endless chain 4 is slightly bent downward until it travels downstream from the driving support shaft 3 a and is supported by the guide rail 7.

  Temporarily, the separation distance h1 is 0.25H with respect to the maximum height H between the valley and the peak of the sprocket in the region supported by the far side guide rail 7 separated from the driving support shaft 3a by a predetermined distance L or more. If it is set in the range of ≦ h1 ≦ 0.75H, and the region supported by the guide rail 7 on the near side until it is separated from the driving support shaft 3a by the predetermined distance L is set to the same range, for example, the sprocket S When the inclined surface at the boundary between the valley portion Sv and the peak portion Sp contacts the engaging portion of the endless chain 4, the endless chain 4 slides up along the inclined surface, and the flight plate 5 is slightly inclined. For example, the flight plate 5 and the presser member 8 may come into contact with each other and the stable travel of the endless chain may be impaired.

  Therefore, the separation distance h2 between the flight plate 5 and the pressing member 8 is set to h1 <h2 ≦ H or h1 <h2 ≦ H + α, α = 0.1H in a region until the predetermined distance L is separated from the driving support shaft 3a. By setting this range, even if the endless chain rises along the edge, stable travel of the endless chain is ensured, and the sloshing phenomenon caused by the earthquake causes the endless chain and flight plate to Even when a large fluid pressure is applied, the endless chain comes into contact with the pressing member before it is separated from the sprocket to be larger than the maximum height H, so that the endless chain can be prevented from being detached from the sprocket.

  The predetermined distance L is preferably set to a value longer than the distance from the axial center of the sprocket S to the starting end of the guide rail 7, and 0.8D ≦ L ≦ 2.5D with respect to the outer diameter D of the sprocket S. It is preferable to set in the range.

  According to experiments, when the outer diameter of the sprocket S is about 600 mm, it is preferably set in the range of 500 mm ≦ L ≦ 1500 mm, and more preferably in the range of 500 mm ≦ L ≦ 1000 mm.

  When setting in the range of h1 <h2 ≦ H, for example, assuming that H = 30 mm, 7.5 mm ≦ h1 ≦ 22.5 mm and h1 <h2 ≦ 30 mm. Preferably, it is set in the range of 15.0 mm <h2 ≦ 30 mm, more preferably 22.5 mm <h2 ≦ 30 mm.

  When setting in the range of h1 <h2 ≦ H + α, for example, assuming that H = 30 mm, 7.5 mm ≦ h1 ≦ 22.5 mm and h1 <h2 ≦ 33 mm. Preferably, it is preferable to set in the range of 15.0 mm <h2 ≦ 33 mm, more preferably 22.5 mm <h2 ≦ 33 mm.

  When setting in the range of h1 <h2 ≦ h1 + β, 0 ≦ β ≦ 10 mm, for example, assuming that H = 30 mm, 7.5 mm ≦ h1 ≦ 22.5 mm, and the lower limit value of h2 is 7.5 mm to 22.5 mm The upper limit value is 7.5 mm (= 7.5 + 0) to 32.5 mm (= 22.5 + 10) or less.

  At the time of construction, a jig that is equivalent to the width of the guide shoe 5b and adjusted to the thickness h1 or h2 is arranged along the guide shoes 5b of the plurality of adjacent flight plates 5, and the width direction of the jig is set. Was adjusted via the first fixing mechanism 91 so that the tip of the presser member 8 was positioned at the center of the presser, and was adjusted via the second fixing mechanism 92 so that the tip of the presser member 8 was in contact with the surface of the jig. It is tightened and fixed later.

  As shown in FIG. 6 (b), it is more preferable that the separation distance h2 is set so as to gradually approach the separation distance h1 in a region until it is separated from the driving support shaft 3a by a predetermined distance L. While ensuring the stable travel of the endless chain, it is possible to effectively prevent the endless chain from being detached from the sprocket when an earthquake occurs.

  As shown in FIG. 6 (c), the separation distance h2 is kept constant in a region until it is separated from the driving support shaft 3a by a predetermined distance L, and is set to gradually approach the separation distance h1 on the far side. May be.

  When the separation distance h2 is maintained constant in a region until it is separated from the driving support shaft 3a by a predetermined distance L, and the distance is switched to the separation distance h1 on the far side, a stepped portion is generated at that position, and the flight board 5 that is traveling There is a risk of damage due to contact. Therefore, it is preferable to connect the two pressing members 8 so as to switch from the separation distance h2 to h1 so that a stepped portion does not occur.

  5B and 5C show a state in which two pressing members 8 made of an angle member having an L-shaped cross section are connected by two bolts and chamfered so as not to generate a stepped portion. It is shown.

  As shown in FIGS. 7A and 7B, the relative positional relationship between the guide shoes 5a and 5b and the attachment portion 5c of the endless chain 4 to the flight plate 5 is not particularly limited.

  In FIG. 4, the first mounting member 9 </ b> B having a “T” shape in a cross-sectional view has a supporting member 9 </ b> A via a long hole (a long hole denoted by reference numeral 91 h in FIG. As shown in FIG. 8, a long hole (reference numeral 92h in FIG. 4D) formed in the hanging portion of the first mounting member 9B having a “T” shape in a sectional view. The second mounting member 9C is clamped and fixed to the support member 9A via the long holes shown in FIG. 4 and is formed through one of the long holes (the long holes indicated by reference numeral 91h in FIG. 4A) formed in two places on the upper side. May be tightened and fixed.

  In any case, the attachment members 9B and 9C are provided with the first attachment member 9B attached to the support member 9A via the first fixing mechanism 91 capable of adjusting the attachment position on the holding member 8 side, the flight plate 5 and the retainer. A second attachment for fixing the presser member 8 to the first attachment member 9B via a second fixing mechanism 92 capable of adjusting the support position of the first attachment member 9B with respect to the separation distance from the member 8 and the extending direction of the presser member 8. It is comprised with the member 9C.

The pressing member 8 is not limited to an angle member having a “L” cross section, and may be a long pipe member or a flat plate member.
FIGS. 9A to 9D show the attachment structure of the pipe-like presser member 8 supported by the support mechanism 9 described above.

  The pressing member 8 is arranged along the extending direction of the guide rail, and includes a pipe member 8b for preventing the flight plate 5 from floating, and holding the pipe member 8b on one end side and mounting members 9B and 9C on the other end side. It is comprised with the holding member 8a hold | maintained. The pipe member 8b is preferably made of a corrosion-resistant metal such as stainless steel.

  FIGS. 10A to 10D show a structure for attaching a long flat plate-like presser member 8 supported by the support mechanism 9 described above. The support mechanism 9 of this aspect is configured to include a support member 9A and a first attachment member 9B, and a long hole 92h along the vertical direction is formed in the hanging portion of the first attachment member 9B having a “T” cross section. The flat pressing member 8 is formed with a long hole 8h along the extending direction at substantially the same interval as the installation interval of the support member 9A.

  A bolt 92c is inserted into a long hole 92h formed in the first attachment member 9B and a long hole 8h formed in the pressing member 8, and is fastened and fixed by a nut 92d. That is, the second fixing mechanism 92 is configured by the long holes 92h and 8h, the bolt 92c, and the nut 92d.

  That is, the support mechanism 9 is fixed directly or indirectly to the wall surface of the settling basin, and is mounted so as to support the presser member 8 between the support member 9A and the support member 9A. The member 9B and a fixing mechanism that fixes the attachment member 9B between the support member 9A and the pressing member 8 may be provided, and the fixing mechanism is a position where the attachment member 9B is attached to the pressing member 8 side. The separation distance between the flight plate 5 and the pressing member 8 and the support position of the attachment member 9B with respect to the extending direction of the pressing member 8 may be adjusted.

  In the embodiment described above, an example in which the presser member 8 supported via the support mechanism 9 is installed at a position corresponding to the endless chains 4 and 4 wound around the support shafts 3a and 3b disposed in the upper layer. As described above, a guide rail is installed in the vicinity of the take-up support shaft 3c in which the endless chains 4 and 4 run substantially horizontally between the take-up support shaft 3c and the support shaft 3b arranged in the lower layer, and the endless chain A pressing member may be disposed at a position facing the guide rail with 4 and 4 interposed therebetween. In this case, rather than the purpose of preventing the endless chains 4 and 4 from detaching from the sprocket due to the sloshing phenomenon, the purpose is to prevent the endless chains 4 and 4 from detaching from the sprocket due to the shaking of the earthquake.

  In the above-described embodiment, the example in which the presser member 8 supported via the support mechanism 9 is incorporated in the sludge scraping device 2 installed in the sedimentation basin 1 has been described, but is supported via the support mechanism 9. Needless to say, the presser member 8 may be incorporated into the second sludge squeezing device 20 that squeezes the sludge scraped to the sludge reservoir 1a to one side of the mud reservoir 1a.

  FIG. 1B shows an example in which a pressing member 28 is disposed between the support shafts 23a and 23c with respect to the pair of endless chains 24 and 24 wound between the support shafts 23a, 23b and 23c. ing. The presser member 28 and the support mechanism for the presser member 28 are also the same as those described above. The endless chains 24, 24 are driven so as to run counterclockwise.

  In the above-described embodiment, the example in which the fixing mechanism is configured by the long hole formed in one side of the mounting member and the bolt and the nut that are tightened after positioning the mounting member through the long hole has been described. The general structure is not limited to such an embodiment, and can be appropriately configured, such as a clip for sandwiching and fixing both of the attachment members so as to be position-adjustable.

  The above-described embodiment is one aspect of the present invention, and the present invention is not limited by the description. Specific configurations and control aspects of each part can be appropriately changed and designed within the scope of the effects of the present invention. Needless to say.

1: sedimentation basin 2: sludge scraping device 3a, 3b, 3c, 3d: support shaft 4: endless chain 5: flight plate 6, 7: guide rail 8: presser member 9: support mechanism 9A: support member 9B: first Mounting member 9C: second mounting member 91: first fixing mechanism 92: second fixing mechanism

Claims (11)

A pair of endless chains wound between a plurality of spindles, a plurality of flight plates attached to the endless chain, and a long guide rail that supports the flight plates that move as the endless chain travels A sludge scraping device that scrapes the sludge accumulated on the bottom of the sedimentation basin with the flight board,
On the side facing the guide rail across the flight plate, a pressing member for preventing the flight plate from floating is disposed,
The pair of endless chains are wound around a sprocket fixed to both ends of each spindle, and a separation distance h1 between the flight plate and the pressing member is a maximum height H between the valley and the peak of the sprocket. Against
0.25H ≦ h1 ≦ 0.75H
Sludge scraping device set to the range of. With respect to the endless chain wound around the sprocket of the driving spindle disposed in the upper layer of the settling basin, the flight plate and the holding member in a far region separated from the driving spindle by a predetermined distance L or more The separation distance h1 is relative to the maximum height H between the valley and the peak of the sprocket.
0.25H ≦ h1 ≦ 0.75H
Is set to the range of
A separation distance h2 between the flight plate and the presser member in a vicinity region until the drive shaft is separated by a predetermined distance L is:
h1 <h2 ≦ H + α, α = 0.1H
The sludge scraping device according to claim 1, which is set in a range of The sludge scraping device according to claim 2 , wherein the separation distance h2 is gradually set closer to the separation distance h1 toward the far area where the endless chain is drawn out in the vicinity area.   The sludge according to claim 2 or 3, wherein the pressing member is configured as a separate body in a region corresponding to each of the neighboring region and the far region, and each pressing member is connected at a boundary between the neighboring region and the far region. Scraping device. A support mechanism that supports the presser member so that the separation distance from the flight plate can be adjusted is provided, and the support mechanism is fixed directly or indirectly to the wall surface of the settling basin and is disposed so as to protrude to the presser member side. A support member, an attachment member that supports the pressing member between the support member, and a fixing mechanism that fixes the attachment member between the support member and the pressing member.
The fixing mechanism includes the attachment position of the attachment member on the holding member side, a separation distance between the flight plate and the holding member, and the holding member supported by the attachment member along the extending direction of the holding member. The sludge scraping device according to any one of claims 1 to 4, wherein the supporting position of the member is configured to be adjustable. The attachment member includes a first attachment member attached to the support member via a first fixing mechanism capable of adjusting an attachment position on the holding member side, a separation distance between the flight plate and the holding member, and the holding member. A second mounting member for fixing the presser member to the first mounting member via a second fixing mechanism capable of adjusting a support position of the presser member supported by the first mounting member along the extending direction of the member. The sludge scraping device according to claim 5, comprising:   The pressing member is formed of an angle member having an L-shaped cross section, and the second attachment member includes an engagement portion that engages with one side end of the angle member, and the engagement portion and the first attachment member. The sludge scraping device according to claim 6, further comprising: a fixing portion that is fastened to the first mounting member so that the separation distance can be adjusted in a state where the pressing member is sandwiched therebetween.   The presser member is disposed along the extending direction of the guide rail, the pipe member prevents the flight plate from floating, the pipe member is held at one end side, and is held by the mounting member at the other end side. The sludge scraping device according to claim 5 or 6, comprising a holding member.   9. The fixing mechanism according to claim 5, wherein the fixing mechanism includes a long hole formed in one of the mounting members, and a bolt and a nut that are tightened after positioning the mounting member through the long hole. Sludge scraping device.   Guide shoes that slide on the guide rails are attached to both upper and lower surfaces of the flight plate, and the holding mechanism suppresses the guide shoes to a position opposite to the guide shoe opposite to the guide shoes that slide on the guide rail. The sludge scraping device according to any one of claims 1 to 9, wherein the member is positioned. The endless chain is wound from the support shaft disposed in the upper layer of the sedimentation basin to the support shaft disposed in the lower layer, and the restraining member is wound on the endless chain wound at least on the support shaft disposed in the upper layer. The sludge scraping device according to claim 1, wherein the sludge scraping device is disposed.

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