JP6273344B1 - Sludge scraping device - Google Patents

Abstract

Provided is a sludge scraping device capable of prescribing the relative positional relationship between a flight plate and a presser member that can prevent unexpected notch chain detachment while ensuring smooth running of the notch chain. A settling pond comprising a pair of endless notch chains wound between a plurality of spindles, a plurality of flight plates attached to the notch chains, and guide rails supporting the flight plates. A sludge scraping device that scrapes sludge accumulated on the bottom with the flight plate, and a notch chain is driven by a presser member that prevents the flight plate from floating on the side facing the guide rail across the flight plate. The drive shaft sprocket fixed at both ends of the support shaft and the sheave wheel provided at both ends of the driven support shaft are wound, and the separation distance h1 between the flight plate and the holding member is set at the flange portion of the sheave wheel. The maximum height H1 is set to a value satisfying h1 ≦ H1. [Selection] Figure 7

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.

  Patent Document 1 shows an example of a sludge scraping device. The sludge scraping device moves as the endless chain travels, a pair of endless chains wound around a plurality of support shafts including a drive shaft, a plurality of flight plates attached to the endless chain. And a long guide rail that supports the flight board that is configured to scrape the sludge accumulated on the bottom of the settling basin with the flight board.

  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.

  Further, Patent Document 2 proposes a sludge scraping device in which an endless chain is formed using a resin notch chain in order to ensure the corrosion resistance of the sludge scraping device and improve the wear resistance. Has been.

Japanese Patent Laid-Open No. 10-57713 JP 2009-244103 A

  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 sludge scraping device.

  In particular, when a resin notch chain is used as an endless chain, it is easy to be affected by sloshing because of its weight reduction, and it may swing not only in the vertical direction but also in the horizontal direction. There was also a risk of disengagement in the axial direction of the sprocket and sheave wheel.

  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 presser member that can prevent unexpected notch chain detachment while ensuring smooth running of the notch 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. A notch chain, a plurality of flight plates attached to the notch chain, and a long guide rail that supports the flight plate that moves as the notch chain travels. A sludge scraping device that scrapes the accumulated sludge 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. The notch chain is wound around a drive shaft sprocket fixed to both ends of the drive support shaft and wheels provided on both ends of the driven support shaft to separate the flight plate from the presser member. Distance h1 is the maximum height H1 of the flange portion of the wheel, in that it is set to a value that satisfies h1 ≦ H1.

  For example, in a sheave wheel that has a smooth peripheral surface and does not mesh with the notch chain, the notch chain may slip in the axial direction of the sheave wheel when it swings in the lateral direction due to the effect of sloshing. Even in a sprocket wheel having a pin that meshes with a notch chain, there is a risk that the notch chain will slide in the axial direction of the sprocket wheel when it swings in the lateral direction due to the influence of sloshing. Even in such a case, if the separation distance h1 between the flight plate and the holding member is set to a value satisfying h1 ≦ H1 with respect to the maximum height H1 of the flange portion of the wheel, the notch chain and the flight plate Even when a large fluid pressure is applied, the notch chain comes in contact with the presser member before it disengages from the wheel to the maximum height H1 or higher. This is avoided. Further, since the flight plate does not come into contact with the presser member during normal travel of the notch chain, smooth travel is not hindered and the endless chain is not damaged by the contact.

The second feature structure, as described in the claim 2, in addition to the first feature configuration described above, before Symbol distance h1 between the flight board and the pressing member, the flange portion of the drive shaft sprocket The maximum height H2 is set to a value satisfying h1 ≦ H2.

  If the notch chain that meshes with the drive shaft sprocket swings in the lateral direction under the influence of sloshing, there is a risk that the notch chain will slip over the flange of the drive shaft sprocket and slide in the axial direction of the drive shaft sprocket. Even in such a case, if the separation distance h1 between the flight plate and the pressing member is set to a value satisfying h1 ≦ H2 with respect to the maximum height H2 of the flange portion of the drive shaft sprocket, the notch chain and the flight Even when a large fluid pressure is applied to the plate, the notch chain comes into contact with the presser member before it disengages from the drive shaft sprocket beyond the maximum height H2, so that the notch chain slides in the axial direction from the drive shaft sprocket. It is possible to avoid getting over the buttocks of the sprocket. Further, since the flight plate does not come into contact with the presser member during normal travel of the notch chain, smooth travel is not hindered and the endless chain is not damaged by the contact.

  According to the third feature configuration, in addition to the first or second feature configuration described above, a separation distance h1 between the flight plate and the pressing member is formed in the notch chain. The depth H3 of the notch groove that meshes with the drive pin of the drive shaft sprocket is set to a value that satisfies h1 ≦ H3.

  According to the above-described configuration, even when a large fluid pressure is applied to the notch chain and the flight plate, the notch chain contacts the presser member before the maximum height H3 is released from the sprocket. Occurrence of an unfavorable situation in which the notch groove is separated from the drive pin of the drive shaft sprocket and idles is avoided.

  In the fourth feature configuration, as described in claim 4, in addition to any of the first to third feature configurations described above, a separation distance h1 between the flight plate and the pressing member is set to The gap distance H4 between the chain guard disposed on the outer periphery of the shaft sprocket and preventing tooth skipping of the notch chain and the notch chain is set to a value satisfying h1 ≦ H4.

  If the separation distance h1 between the flight plate and the holding member is set to be equal to or less than the clearance distance H4 between the chain guard and the notch chain, the drive shaft sprocket and its When the notch chain enters the gap with the chain guard disposed on the outer peripheral portion, it is possible to avoid an unfavorable situation in which the notch chain comes into contact with the chain guard and is damaged. Further, when H4 = h1, a chain guard for preventing tooth skipping can be used as a measure for sloshing.

  In the fifth feature configuration, as described in claim 5, in addition to any of the first to fourth feature configurations described above, a separation distance h1 between the flight plate and the pressing member is set to A clearance distance H5 between a chain guard disposed on the outer periphery of the shaft sprocket and preventing tooth skipping of the notch chain and an attachment of the flight plate attached to the notch chain is set to a value satisfying H5 ≦ h1. In the point.

  If the distance between the chain guard and the flight plate attachment is reduced, the effect of suppressing the wheel removal is increased, but the flight plate may come into contact with the holding member during normal travel of the notch chain, and there is a possibility of wear and damage. However, such an inconvenient situation can be avoided by providing an appropriate lower limit value.

  In addition to any one of the first to fifth feature configurations described above, the sixth feature configuration is the axial center of a wheel disposed adjacent to the downstream side of the drive shaft sprocket. The distance h2 between the flight plate and the presser member in the vicinity of the predetermined distance L determined from the distance from the guide rail to the end of the guide rail to the upstream side from the wheel axis is This is in the point set to a value larger than the separation distance h1.

  When the notch chain, in which the link plates are rotatably connected to each other by the connecting pins, is supported by the wheel and the running direction changes, adjacent link plates are affected by friction and rotate smoothly around the connecting pins. In some cases, the notch chain may bulge in the radial direction on the upstream side of the wheel. Such a phenomenon may occur in a vicinity region where the distance from the wheel axis to the end of the guide rail is a predetermined distance L determined based on the distance.

By setting the separation distance h2 between the flight plate and the holding member in the vicinity region to a value larger than the separation distance h1, contact between the flight plate and the holding member can be avoided, and the notch chain is assumed to be in the radial direction. even in the case where the bulging, stable running of the notch chain Ru is secured.

In the seventh feature configuration, as described in claim 7 , in addition to the first feature configuration described above, a separation distance h1 between the flight plate and the pressing member is formed in the notch chain. The depth H3 of the notch groove that meshes with the drive pin of the shaft sprocket, and the gap distance H4 between the chain guard that is arranged on the outer periphery of the drive shaft sprocket and prevents tooth skipping of the notch chain and the notch chain , H1 ≦ H4 ≦ H3 ≦ H1.

In the eighth feature configuration, as described in claim 8 , in addition to the seventh feature configuration described above, a separation distance h1 between the flight plate and the presser member is formed on an outer peripheral portion of the drive shaft sprocket. The gap distance H5 between the chain guard arranged and preventing tooth skipping of the notch chain and the flight plate attachment attached to the notch chain is set to a value satisfying H5 ≦ h1 ≦ H4 ≦ H3 ≦ H1. In the point.

  As described above, according to the present invention, the sludge scraper capable of prescribing the relative positional relationship between the flight plate and the presser member that can prevent the unexpected notch chain from being removed while ensuring smooth running of the notch 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 a partial plan view of the notch chain, (b) is a front view of the notch chain, (c) is an explanatory side view of the engagement state of the drive shaft sprocket and the notch chain, and (d) is a drive shaft sprocket and the notch chain. Plan view explanatory diagram of the meshing state of (A) is explanatory drawing of the separation distance of a flight board and a pressing member, (b) is principal part explanatory drawing of the attaching part of the flight board to a notch chain. (A) is explanatory drawing of the clearance of the drive mechanism of a notch chain with respect to the separation distance of a flight board and a pressing member, (b) is schematic explanatory drawing of the AA line cross section of (a), (c) is a flight board. Explanatory drawing which shows the relationship with the collar part of a sheave wheel with respect to the separation distance of a presser member

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.

  The drive shaft sprocket S1 is attached to both ends of the drive support shaft 3a via a key so as to rotate integrally with the support shaft 3a, and the sheave wheels S2, S3 and S3 are respectively connected to both ends of the driven support shafts 3b, 3c, 3d. A pair of endless chains 4 and 4 are wound around the drive shaft sprocket S1 and the sheave wheels S2, S3 and S4 so that S4 rotates integrally with each of the support shafts 3b, 3c and 3d. Yes. 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.

Each of the endless chains 4 and 24 is composed of a notch chain molded using a resin material in order to reduce weight and secure corrosion resistance.
5A and 5B illustrate a part of the notch chain 4. The notch chain 4 is configured as an endless chain in which a plurality of link plates 41 are rotatably connected by connecting pins 40.

  Each link plate 41 includes a single annular portion 42 having a narrow width formed on the base end side and a pair of wide annular portions 43, 43 formed in a fork-like shape formed on the distal end side. It is integrally formed so as to be integrally connected at 44.

  In a state where the annular portion 42 of one link plate 41 is sandwiched between the annular portions 43, 43 of the other link plate 41, the connecting pin 40 is fitted so that the axial centers of the respective annular portions coincide with each other so as to be freely connected. Has been.

  A notch 45 that engages with the drive pin of the drive shaft sprocket S1 is formed in the vicinity of the annular portion 42 in the abdomen that is the lower edge of the link member 44 in a front view, and the sheave wheels S2, S3, and the like on the annular portions 43, 43 side. A gentle curved surface is formed along the circumferential surface of S4. An attachment seat 46 for the flight board 25 is provided on the back surface of the link member 44.

  As shown in FIGS. 5C and 5D, the drive shaft sprocket S1 has a pair of left and right disk-shaped side plates 30 and 30 connected together by a support ring 31 so as to be integrally rotatable, and a plurality of drive pins 32 are connected to the side plate 30. , 30 are arranged so as to be parallel to the support ring 31. When the support ring 31 is fitted and fixed to the support shaft 3a (see FIG. 2), the drive shaft sprocket S1 rotates integrally with the support shaft 3a.

  When the notch 45 of the notch chain 4 wound around the drive shaft sprocket S1 is engaged with the drive pin 32, the notch chain 4 is sent in the rotational direction of the drive shaft sprocket S1 and travels.

  A chain guard 10 is provided on the outer peripheral portion of the drive shaft sprocket S1 to prevent a tooth skip phenomenon in which the notch 45 is engaged with the drive pin 32 and the notch 45 is engaged with the drive pin 32 in the region where the notch chain 4 approaches. Yes.

  The surface of the chain guard 10 facing the drive shaft sprocket S1 is formed in an arcuate curved surface coaxial with the drive shaft sprocket S1, and the minimum distance between the back surface of the notch chain 4 and the arcuate curved surface of the chain guard 10 can prevent tooth skipping. Is set to a proper interval. The chain guard 10 is supported and fixed to the left and right side walls by mounting brackets (not shown).

  As shown in FIG. 6B, attachments 50 for fixing the flight plate 5 to the mounting seats 46 of the notch chain 4 are provided at both ends of the long flight plate 5. The back surface of the notch chain 4 is placed on the attachment 50, the bolt B is inserted into the pair of mounting holes 51, and the nut N is fastened and fixed.

  Guide shoes 5a and 5b are attached to the upper and lower surfaces of the attachment 50 with the notch chain 4 interposed therebetween. When the flight plate 5 travels while being supported by the guide rails 7 and 7 installed in the upper layer, the guide shoe 5a slides on the guide rails 7 and 7 and the guide shoe 5b faces a pressing member, which will be described later. The guide shoe 5b slides on the guide rails 6 and 6 when the plate 5 travels while being supported by the guide rails 6 and 6 laid on the pond bottom.

  As shown in FIG. 7C, the sheave wheels S <b> 2, S <b> 3, S <b> 4 are configured by forming flanges 61 on both side surfaces of the cylindrical body 60 having a smooth peripheral surface. The abdomen of each link member 44 constituting the notch chain 4 is in contact with the part to support the traveling track of the notch chain 4.

  Corrosion-resistant metals such as resin and stainless steel are preferably used as the guide rail material, and wood, resin and corrosion-resistant metal are preferably used as the flight board material.

  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. There is a risk that the endless chain may be detached from the drive shaft sprocket and sheave wheel provided in the above and 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.

  As shown in FIGS. 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. Is provided with a first mounting member 9B and a second mounting member 9C for positioning and fixing the presser member 8 to the support member 9A. In FIG. 3, reference numeral 4 represents a notch endless chain, and reference numeral 5 c represents an attachment portion of the notch 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.

  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 A fixing portion 92b for tightening the first mounting portion 9B so that the separation distance h1 between the flight plate 5 and the pressing member 8 can be adjusted in a state where the pressing member 8 is sandwiched between the first mounting member 9B. The separation distance h <b> 1 between the flight plate 5 and the pressing member 8 is a distance from the surface of the guide shoe 5 b provided on the flight plate 5 to the tip of the pressing member 8.

  Further, the second mounting member 9C and the pressing member 8 are configured to be relatively movable in a state where the pressing member 8 is sandwiched between the engaging portion 92a and the first mounting member 9B. The presser member 8 can be slid in the extending direction of the presser member 8 with respect to the second mount member 9C in a state of being fastened or temporarily fixed to the first mount 9B. The second mounting member 9C can be aligned with the first mounting portion 9B by sliding the 2 mounting member 9C in the extending direction of the pressing member 8.

  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.

  The pressing member 8 is positioned by a support mechanism 9 at a predetermined position facing the guide shoe 5 b provided on the upper surface of the attachment 50 of the flight plate 5. 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 board 5, the presser 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 holding member , so that the flight plate 5 having a lower strength than the guide shoe has a lower strength. 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 pressing member 8 is disposed on the endless chains 4 and 4 wound around the support shafts 3a and 3b disposed at least 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 pressing 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.

  As shown in FIG. 6A and FIGS. 7A and 7B, the separation distance h1 between the flight plate 5 and the presser member 8 is relative to the maximum height H1 of the flange 61 of the sheave wheel S2. It is set to a value satisfying h1 ≦ H1. As already described, the separation distance h1 between the flight plate 5 and the pressing member 8 is a distance from the surface of the guide shoe 5b provided on the flight plate 5 to the tip of the pressing member 8.

  In the sheave wheel S2, which has a smooth peripheral surface and does not mesh with the notch chain 4, the notch chain 4 may slide in the axial direction of the sheave wheel S2 when it swings in the lateral direction under the influence of sloshing. Even in such a case, if the separation distance h1 between the flight plate 5 and the pressing member 8 is set to a value satisfying h1 ≦ H1 with respect to the maximum height H1 of the flange 61 of the sheave wheel S2, the notch Even when a large fluid pressure acts on the chain 4 and the flight plate 5, the notch chain 4 comes into contact with the presser member 5 before it is detached from the sheave wheel S <b> 2 beyond the maximum height H <b> 1, so that the notch chain 4 is separated from the sheave wheel S <b> 2. Slip in the axial direction and get over the flange 61 of the sheave wheel S2 to be separated is avoided.

  Further, since the flight plate 5 does not contact the presser member 8 during normal travel of the notch chain 4, smooth travel is not hindered and the endless chain is not damaged by the contact. .

  Further, the separation distance h1 between the flight plate 5 and the pressing member 8 is set to a value satisfying h1 ≦ H2 with respect to the maximum height H2 of the flange portion 30a formed on the peripheral portion of the side plate 30 of the drive shaft sprocket S1. Has been. The maximum height H2 of the flange portion 30a is the maximum distance between the outermost peripheral portion of the drive pin 32 and the outermost peripheral portion of the side plate 30 from the center of the side plate 30. The collar portion 30a may be formed integrally with the side plate 30 or may be formed separately from the side plate 30.

  When the notch chain 4 that meshes with the drive shaft sprocket S1 swings in the lateral direction due to the influence of sloshing, there is a risk that the notch chain 4 will ride over the flange 30a of the drive shaft sprocket S1 and slide in the axial direction of the drive shaft sprocket S1. . Even in such a case, if the separation distance h1 between the flight plate 5 and the pressing member 8 is set to a value satisfying h1 ≦ H2 with respect to the maximum height H2 of the flange portion 30a of the drive shaft sprocket S1, Even when a large fluid pressure is applied to the notch chain 4 and the flight plate 5, the notch chain 4 comes into contact with the presser member before being detached from the drive shaft sprocket S1 to a height not less than the maximum height H2, so that the notch chain 4 is driven to the drive shaft sprocket. It is possible to avoid slipping in the axial direction from S1 and getting over the collar portion 30a of the drive shaft sprocket S1.

  Further, the separation distance h1 between the flight plate 5 and the pressing member 8 satisfies h1 ≦ H3 with respect to the depth H3 of the notch groove 45 formed in the notch chain 4 and meshed with the drive pin 32 of the drive shaft sprocket S1. Is set to a value.

  According to the above-described configuration, even when a large fluid pressure is applied to the notch chain 4 and the flight plate 5, the notch chain 4 comes into contact with the presser member 8 before being detached from the drive shaft sprocket S1 to the maximum height H3 or more. The occurrence of an unfavorable situation in which the notch groove 45 formed in the notch chain 4 is detached from the drive pin 32 of the drive shaft sprocket S1 and idles is avoided.

  Further, the separation distance h1 between the flight plate 5 and the holding member 8 is relative to the gap distance H4 between the chain guard 10 and the notch chain 4 which is disposed on the outer peripheral portion of the drive shaft sprocket S1 and prevents tooth skipping of the notch chain 4. , H1 ≦ H4.

  When the separation distance h1 between the flight plate 4 and the holding member 8 is set to be equal to or less than the gap distance H4 between the chain guard 10 and the notch chain 4, even when a large fluid pressure acts on the notch chain 4 and the flight plate 8, When the notch chain 4 enters the gap between the drive shaft sprocket S1 and the chain guard 10 disposed on the outer periphery of the drive shaft sprocket S1, occurrence of an unfavorable situation in which the notch chain 4 comes into contact with the chain guard 10 and is broken is avoided. The

  The separation distance h1 between the flight plate 5 and the pressing member 8 is set to a value satisfying H5 ≦ h1 with respect to the gap distance H5 between the chain guard 10 and the attachment 50 of the flight plate 5 attached to the notch chain 4. Preferably it is.

  The separation distance h1 between the flight plate 4 and the pressing member 8 is the maximum height H1 of the flange 61 of the sheave wheel S2, the depth H3 of the notch groove formed in the notch chain 4, and the chain guard 10 and the notch chain 4 The gap distance H4 is preferably set to a value satisfying h1 ≦ H4 ≦ H3 ≦ H1. Further, the gap distance H5 between the chain guard 10 and the attachment 50 of the flight plate 5 is preferably set to a value satisfying H5 ≦ h1 ≦ H4 ≦ H3 ≦ H1.

  In the present embodiment, the link plate 41 has a left-right length of about 200 mm, a vertical length of about 70 mm, an outer diameter of the annular portions 42, 43 of about 50 mm, an inner diameter of about 30 mm, and a maximum depth annular portion 43, 43 in the front view. The length between them is set to about 75 mm, and the depth H3 of the notch is set to about 20 mm.

  The maximum height H1 of the flange 61 of the sheave wheel S2 is about 40 mm, the maximum height H2 of the flange 30a formed on the peripheral portion of the side plate 30 of the drive shaft sprocket S1 is about 30 mm, the chain guard 10 and the notch chain. 4 is set to about 20 mm, and a gap distance H5 between the chain guard 10 and the attachment 50 of the flight plate 5 is set to about 5 mm.

  That is, in this embodiment, the relationship is H5 (5 mm) ≦ h1 (20 mm) ≦ H4 (20 mm) ≦ H3 (20 mm) ≦ H1 (40 mm). However, the specific dimensions of each part can be set as appropriate within a range satisfying H5 ≦ h1 ≦ H4 ≦ H3 ≦ H1.

  In other words, if the separation distance h1 is too large, the notch chain can be easily detached from the drive sprocket and the driven sheave wheel due to sloshing. On the other hand, if the distance h1 is too small, the flight plate and the presser member can come into contact with each other even with minute vibration during normal operation Therefore, there exists an optimum range as the separation distance h1 that does not affect the sludge scraping device. Further, by clarifying the separation distance h1, it is possible to expect improvement in workability and securing of quality stability.

  The upper limit of the optimum range h1 can be set to the height H1 of the sheave wheel of the upper driven shaft when the chain guard is not generally provided. H2, then the notch groove depth H3 of the notch chain, and the gap distance H4 between the notch chain and the notch chain provided on the outer periphery of the drive shaft sprocket can be determined in order.

  The lower limit of the optimum range h1 can be the gap distance H5 between the chain guard for preventing tooth skipping of the notch chain provided on the outer periphery of the drive shaft sprocket and the attachment of the flight plate attached to the notch chain. If h1 is set to be smaller than the gap distance H5, if sloshing occurs during operation of the sludge scraping device, even if the attachment passes through the chain guard, it may come into contact with the presser member, and the flight plate may be damaged.

  As shown in FIG. 6A, the sheave wheel S2 is equal to or greater than a predetermined distance L determined based on the distance from the axis of the sheave wheel S2 disposed adjacent to the downstream side of the drive shaft sprocket S1 to the terminal end of the guide rail 7. The distance h1 between the flight plate 5 and the presser member 8 is a value that satisfies h1 ≦ H1 with respect to the maximum height H1 of the flange 61 of the sheave wheel S2 in a far region separated upstream from the axis of The distance h2 between the flight plate 5 and the presser member 8 is greater than the separation distance h1 and is the maximum height of the collar portion of the sheave wheel in the vicinity of the set distance from the shaft center of the sheave wheel S2 by the predetermined distance L. It is preferably set to H1 or less. The downstream side refers to the direction in which the notch chain 4 is sent out by the drive shaft sprocket S1 for sludge conveyance, and the upstream side refers to the opposite direction.

  When the notch chain 4 in which the link plates 41 are connected to each other by the connecting pins 40 is supported by the sheave wheel S2 and the traveling direction changes downward, the adjacent link plates 41 are affected by friction and the like. Thus, the sheave wheel S2 may be brought into contact with the connecting pin 40 without being smoothly rotated. In such a case, the notch chain 4 may swell radially in the upstream side of the sheave wheel S2. Such a phenomenon may occur in the vicinity of the sheave wheel S2 from the axial center of the sheave wheel S2 to the end of the guide rail 7 up to a predetermined distance L determined with reference to the distance L1.

  Therefore, by setting the separation distance h2 between the flight plate 5 and the pressing member 8 in the vicinity region to be larger than the separation distance h1 and slightly smaller than the maximum height H1 of the flange portion 61 of the sheave wheel S2. Contact between the flight plate 5 and the presser member 8 can be avoided, and even if the notch chain 4 swells in the radial direction, stable running of the notch chain 4 is ensured, and sloshing generated by an earthquake. Even when a large fluid pressure is applied to the notch chain 4 and the flight plate 5 due to the phenomenon, the notch chain 4 comes into contact with the presser member 8 before it is larger than the maximum height H1 and disengages from the sheave wheel S2. It is possible to avoid the separation from the sheave wheel S2.

  The predetermined distance L is preferably set to a value longer than the distance L1 from the axial center of the sheave wheel S2 to the end of the guide rail 7, and 0.8D ≦ L ≦ with respect to the outer diameter D of the sheave wheel S2. It is preferably set in the range of 2.5D.

  According to experiments, when the outer diameter D of the sheave wheel S2 is about 450 mm, it is preferably set in a range of 360 mm ≦ L ≦ 1125 mm, and more preferably in a range of 400 mm ≦ L ≦ 1000 mm. Further, when setting in a range of h1 <h2 ≦ H1, for example, when H1 = 40 mm, a range in which H5 ≦ h1 ≦ H3 is established, and h1 <h2 ≦ 40 mm is satisfied.

  Another embodiment is shown below.

  In the above-described embodiment, the sheave wheel has been described as an example of the wheel provided at both ends of the driven spindle, but a sprocket wheel may be used instead of the sheave wheel.

  4 (b) and 4 (c), 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. 6A and 6B, 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.

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.
ing.
The

  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: driving spindles 3b, 3c, 3d: driven spindle 30a: flange 32 of driving shaft sprocket: driving pin 4: notch chain (endless chain)
5: Flight plates 6, 7: Guide rail 61: Sheave wheel flange 8: Presser member 9: Support mechanism 9A: Support member 9B: First attachment member 9C: Second attachment member 91: First fixing mechanism 92: First 2 Fixing mechanism S1: Drive shaft sprocket S2, S3, S4: Sheave wheel

Claims (8)

A pair of endless notch chains wound between a plurality of spindles, a plurality of flight plates attached to the notch chains, and a long length that supports the flight plates that move as the notch chains travel A sludge scraping device that scrapes sludge accumulated on the bottom of a 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 notch chains are wound around a drive shaft sprocket fixed to both ends of the driving support shaft and wheels provided at both ends of the driven support shaft, and a separation distance h1 between the flight plate and the pressing member. However, the sludge scraping device is set to a value satisfying h1 ≦ H1 with respect to the maximum height H1 of the heel portion of the wheel. Distance h1 between the pressing member and the front Symbol flight plate, the maximum height H2 of the flange portion of the drive shaft sprocket, sludge raking of claim 1, wherein it is set to a value that satisfies h1 ≦ H2 apparatus.   The separation distance h1 between the flight plate and the pressing member is set to a value satisfying h1 ≦ H3 with respect to the depth H3 of the notch groove formed in the notch chain and meshed with the drive pin of the drive shaft sprocket. The sludge scraping device according to claim 1 or 2.   A separation distance h1 between the flight plate and the pressing member is h1 ≦ with respect to a gap distance H4 between the chain guard and the notch chain which is disposed on the outer peripheral portion of the drive shaft sprocket and prevents tooth skipping of the notch chain. The sludge scraping device according to any one of claims 1 to 3, which is set to a value satisfying H4.   A separation distance h1 between the flight plate and the pressing member is a gap distance between a chain guard disposed on the outer periphery of the drive shaft sprocket and preventing tooth skipping of the notch chain and an attachment of the flight plate attached to the notch chain. The sludge scraping device according to any one of claims 1 to 4, wherein the sludge scraping device is set to a value satisfying H5≤h1 with respect to H5.   In a region near a predetermined distance L which is a predetermined distance L or more based on the distance from the wheel shaft disposed adjacent to the downstream side of the drive shaft sprocket to the terminal end of the guide rail and upstream from the wheel shaft. The sludge scraping device according to any one of claims 1 to 5, wherein a separation distance h2 between the flight plate and the pressing member is set to a value larger than the separation distance h1.   A separation distance h1 between the flight plate and the pressing member is disposed at a notch groove depth H3 formed in the notch chain and meshed with a drive pin of the drive shaft sprocket, and an outer peripheral portion of the drive shaft sprocket. The sludge scraping device according to claim 1, wherein the clearance distance H4 between the chain guard for preventing tooth skipping of the notch chain and the notch chain is set to a value satisfying h1 ≦ H4 ≦ H3 ≦ H1. A separation distance h1 between the flight plate and the pressing member is a gap distance between a chain guard disposed on the outer periphery of the drive shaft sprocket and preventing tooth skipping of the notch chain and an attachment of the flight plate attached to the notch chain. The sludge scraping device according to claim 7 , wherein the sludge scraping device is set to a value satisfying H5 ≦ h1 ≦ H4 ≦ H3 ≦ H1 with respect to H5.

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