JP4063853B2 - Scum collection device - Google Patents

Description

  The present invention relates to a scum recovery device for scraping and recovering scum floating near the water surface of a sedimentation basin in a sewage treatment facility, a sludge treatment facility, or the like.

  For example, in a sewage treatment facility, after solids and the like are removed from sewage, untreated water containing sludge is sent to a settling basin. The settled sludge accumulates on the bottom of the sedimentation basin. Of this deposit, sludge containing gas generated by rot, etc. floats as scum and floats near the water surface. The suspended matter such as scum is scraped by the scraping plate of the scum recovery device and recovered by the recovery mechanism. The recovery mechanism is positioned on a track around which the scraping plate circulates, and has a scum inlet for recovering the scum. A drain pipe for discharging the scum communicates with the scum inlet, and the scum collected at the scum inlet is discharged to the outside through the drain pipe.

  Here, a scum recovery device is proposed in which a weir is provided in front of the scum inlet of the recovery mechanism (see, for example, Patent Document 1). The front end side of the scum inlet opens at a position lower than the water surface, and the weir is provided to move up and down at a position before the scum inlet. When the scum is scraped toward the collecting mechanism by the scraping plate, the weir is lowered from the water surface in conjunction with the scum, and the scum flows into the scum inlet together with the water to be treated and is collected by the collecting mechanism. After that, the weir rises from the surface of the water, so that the weir is in a dammed state.

JP 7-305325 A

  However, in the scum recovery device having the above-described configuration, the recovery mechanism is fixed, and the height position of the scum inlet does not change. Therefore, the following problem occurs in a sedimentation basin with a large fluctuation in water level. For example, if the water level in the sedimentation pond becomes high, the amount of water that flows over the weir and into the scum inlet of the recovery mechanism together with the scum becomes too large, so that the drainage by the drain pipe cannot catch up and the scum flows into the scum recovery mechanism Since no flow can be obtained, the scum cannot be recovered. Further, when the water level in the sedimentation basin becomes low, scum hardly flows into the scum inlet of the recovery mechanism, and a large amount of recovery leakage occurs.

  The present invention has been made paying attention to the above-mentioned problems, and even in a sedimentation basin where the fluctuation of the water level is large, the amount of scum and water flowing into the scum inlet is kept constant, and the scum is stabilized. An object of the present invention is to provide a scum recovery device that can be discharged.

In the scum recovery device according to the present invention, the scum floating near the water surface of the sedimentation basin is scraped by the scraping plate that circulates on the water surface in the sedimentation basin and introduced into the scum inlet arranged on the passageway of the scraping plate. It is a thing. The scum recovery device includes a support arm that circulates in the settling basin, a scraping plate that is provided integrally with the support arm at a rear position in the traveling direction of the support arm, and a scum inlet and a scum inlet that face upward. A scum recovery box provided on the front end side and having a weir held on the water surface during normal times, and supported so as to be tiltable so that the scum inlet faces in the direction in which the scraping plate advances, and the support A scum having a support arm float that is attached to the arm and vertically displaces the tip of the support arm in accordance with fluctuations in the water level of the settling basin , a horizontal guide surface on the upper surface, and a pressing member that projects downward on the lower surface. a movable guide for the guide surface above the collection box via a link mechanism is movable up and down while maintaining a horizontal, of the support arm in the traveling direction of the forward position of the raking plate Is supported by the end, a pressing roller that rolls on the guide surface in a state where said dam by the pressing member is pressed from above scum collection box down the movable guide until the tilt, the link mechanism is erected And a spring for urging the movable guide back to its original state . The movable guide has a guide surface length so that the scum recovery box tilts when the scraping plate comes to a position before the scum inlet, and the scum recovery box returns to its original state when it reaches the scum inlet. Is set.

In the above-described configuration of the present invention, the “ scum recovery box ” includes a scum recovery saddle generally called “scum skimmer”, but is not necessarily limited to such a form. The scum inlet of the scum recovery box is maintained on the water surface during normal times by attaching a balance weight to the scum recovery box , for example, so that the height of the scum inlet is above the water surface. As a result, water and scum are prevented from flowing into the scum inlet. In a preferred embodiment of the present invention, the weir is formed by a float so that the height position thereof is displaced up and down in accordance with fluctuations in the water level of the settling basin. According to this embodiment, even when the water level of the sedimentation basin is greatly increased or decreased, the height position of the scum inlet of the scum recovery box rises and falls following the fluctuation of the water level of the sedimentation basin due to the buoyancy of the weir. Therefore, the scum inlet is always kept at an upper position with respect to the water surface during normal times.

In the scum recovery device according to this embodiment, when the support arm and the scraping plate circulate integrally on the water surface in the settling basin, the scum floating near the water surface of the settling basin is guided to the outer scraping plate by the support arm. When the scraping plate reaches a position in front of the scum inlet of the scum recovery box , a pressing roller provided at a front position of the scraping plate rolls on the guide surface on the upper surface of the movable guide to push the movable guide downward. . When the movable guide is pushed down, the pressing member protruding from the lower surface of the movable guide presses the weir provided in the scum collection box downward, and the scum collection box is directed in the direction in which the scraping plate advances. Tilt. As a result, the end portion of the scum inlet on the scum inflow side is submerged below the surface of the water, so that the scum scraped to the front of the scraping plate flows into the scum inlet with water and is collected in the scum collection box . Thereafter, when the scraping plate reaches the scum inlet, the pressing roller falls from the guide surface of the movable guide, and the movable guide is raised to the original height position by the biasing force of the spring . Thereby, since the scum recovery box is released from the pressing force by the pressing member , the scum recovery box returns to the original state, and the inflow of water to the scum inlet is prevented.

According to this scum recovery device, even when the water level of the sedimentation basin changes as it rises or falls, for example , the height of the scum inlet of the scum recovery box is the same as the water level of the sedimentation basin due to the buoyancy of the weir formed by the float . Since it is displaced up and down following the fluctuation, the scum inlet is always kept at a position above the water surface during normal times . On the other hand, the pressing roller is displaced up and down following the fluctuation of the water level due to the buoyancy of the support arm float attached to the support arm, so that the pressing roller is immersed below the surface of the water at the end on the inflow side of the scum inlet. Is kept almost constant. Therefore, the amount of scum and water flowing into the scum inlet can be kept constant.

According to the present invention, when the water level of the sedimentation basin changes, the pressing roller receives the buoyancy of the float for the support arm attached to the support arm and moves up and down following the fluctuation of the water level of the sedimentation basin. The displacement by which the scum recovery box is pushed down by the pressing roller via the pressing member is kept constant, and the amount of scum and water flowing into the scum inlet can be kept constant. Moreover, if the weir is formed by a float, the height of the scum inlet of the scum recovery box will follow the fluctuation of the water level of the sedimentation basin due to the buoyancy of the scum even if the water level of the sedimentation basin changes greatly. Therefore, the scum inlet can always be held at the same height above the water surface during normal times.

  1 and 2 show an example in which a scum recovery device 1 according to an embodiment of the present invention is installed in a settling basin in a final treatment process in a sewage treatment facility. In addition, the scum recovery apparatus of this invention is applicable not only to a sedimentation basin of a sewage treatment facility but also to other sedimentation basins such as a sludge treatment facility.

The sedimentation basin 100 in the illustrated example has a circular planar shape, and the basin 100a of the sedimentation basin 100 has an inclined surface that inclines toward the center. A cylindrical portion 2 protruding upward is formed at the center position of the pond bottom 100a. Inside the cylindrical portion 2, an inflow pipe 3 for flowing sewage before treatment (hereinafter referred to as “raw water”) W ₀ after removal of solids and the like into the settling basin 1 penetrates. The raw water W ₀ is distributed and supplied to the settling basin 100 from the outlet at the upper end of the inflow pipe 3.
An annular groove 4 for accumulating sludge M is formed along the outer periphery of the cylindrical portion 2 on the bottom 100a of the settling basin 100, and a drawing for extracting the sludge M to the outside in the annular groove 4 is formed. A tube 5 is in communication.

In the upper position of the outer peripheral wall of the sedimentation basin 100, a water channel 6 that goes around the sedimentation basin 100 is formed. The treated water W after removing the scum from the raw water W ₀ flows into the water channel 6. The treated water W that has flowed into the water channel 6 is drawn to the outside by the drawing tube 9. A scum inflow prevention plate 7 is attached to the inside of the water channel 6, and the scum inflow prevention plate 7 prevents scum floating near the water surface of the sedimentation basin 100 from flowing into the water channel 6. In FIG. 1, reference numeral 8 denotes a bridge constructed above the sedimentation basin 100.

  At the center position of the sedimentation basin 100, a rotary drive mechanism 10 using the motor 11 as a drive source is provided. The motor 11 is installed on a disc-shaped mounting substrate 12 fixed to the cylindrical portion 2. The motor shaft of the motor 11 passes through the mounting substrate 12 and protrudes downward, and a pinion gear (not shown) is attached to the protruding portion. The rotation drive mechanism 10 includes a rotation frame 13 provided so as to surround the outer periphery of the cylindrical portion 2, and a rotation ring 14 connected to the upper end of the rotation frame 13. The inner peripheral surface of the rotating ring 14 is formed as an internal gear that meshes with the pinion gear. When the pinion gear rotates, the rotating ring 14 rotates in conjunction with this rotation, and the rotating frame 13 rotates in the direction of arrow a in FIG. To do.

  A pair of rake arms 15 </ b> A and 15 </ b> B made of a truss-shaped structure project in the radial direction below the outer peripheral surface of the rotary frame 13. Each rake arm 15A, 15B circulates in the annular groove 4 and the blade 16 for sludge scraping to scrape the sludge M accumulated on the pond bottom 100a by sliding on the pond bottom 100a into the annular groove 4. A slat 17 for collecting the sludge M is provided. The annular groove 4 communicates with the extraction pipe 5, and the sludge M collected in the annular groove 4 is extracted outside by the extraction pipe 5.

The scum floating near the water surface h of the settling basin 100 is scraped by the scum recovery device 1 of the present invention and recovered in the scum recovery box 42 of the scum recovery mechanism 40. As shown in FIGS. 3 and 4, the scum recovery device 1 rotates integrally with the rotary frame 13 of the rotary drive mechanism 10 described above and rotates around the settling basin 100 along the water surface h. A scum recovery box 42 having a scraping plate 21 that circulates integrally with the support arm 20 along the water surface h, a scum inlet 41 for introducing the scum scraped by the scraping plate 21, and a scum recovery A movable guide 50 is provided above the box 42 so as to be movable up and down.

  The support arm 20 is connected and fixed at its base end to the rotary frame 13, and rotates in the settling basin 100 in the direction of arrow a in FIG. Suck the scum to be guided to the outer circumferential direction. The support arm 20 and the auxiliary arm 29 integrated with the support arm 20 have base ends connected to the rotary frame 13 via universal joints 30a and 30b, whereby the tip end of the support arm 20 is the base end. It can be tilted up and down with the part as a fulcrum.

A pressing roller 22 is attached to the front end portion of the support arm 20 at a front position in the moving direction of the scraping plate 21. The pressing roller 22 rides on the guide surface 51 of the movable guide 50 attached above the scum collection box 42 and rolls to push down the movable guide 50 for a certain period.

  The setting position of the pressing roller 22 can be adjusted in advance by an adjusting bolt 25. The amount by which the movable guide 50 is pushed down by the pressing roller 22 can be adjusted by raising and lowering the setting position of the pressing roller 22 with the adjusting bolt 25, thereby allowing the weir float 47 to be pressed by the pressing member 52 as will be described later. It is possible to adjust the amount of pressing down.

  The support arm 20 is provided with a hollow support arm float 23 from the center to the tip. Upon receiving the buoyancy of the support arm float 23, the support arm 20 is always held on the water surface h as shown in FIG. 5 (1), and the pressing roller according to the fluctuation of the water level. The height position of 22 is adjusted. That is, when the water surface h of the settling basin 100 rises, the support arm 20 is inclined so that the tip end portion becomes higher with the base end portion as a fulcrum, as shown in FIG. Displace upward. When the water surface h of the settling basin 100 is lowered, the support arm 20 is inclined so that the tip end portion is lowered with the base end portion as a fulcrum as shown in FIG. Displace.

  The scraper plate 21 is composed of a base body 26 attached to the support arm float 23 and a rubber plate-like piece 28 suspended on the lower surface of the base body 26 via a suspension member 27. The scraping plate 21 circulates in the settling basin 100 integrally with the support arm 20 along the water surface h. The scum scraped by the support arm 20 is guided to the scum collection mechanism 40.

The scum recovery mechanism 40 is installed in the sedimentation basin 100 by the bracket 18 installed on the outer peripheral wall of the sedimentation basin 100. As shown in FIGS. 3, 4, and 6, the scum collection mechanism 40 includes a scum collection box 42 having a scum inlet 41 for collecting scum on the upper surface thereof opened upward, and a scum collection box 42 The scum outlet 42a is connected to the scum outlet 42a located at the lower portion through a flexible tube 43 having a bellows structure. The scum outflow pipe 44 is for discharging the scum from the sedimentation basin 100, and is guided to the outside of the sedimentation basin 100 through the outer peripheral wall of the sedimentation basin 100. The flexible tube 43 is interposed between the scum outlet tube 44 so that the scum recovery box 42 can tilt.

The scum recovery box 42 is integrally provided with a support shaft 45 at a central position. Both end portions of the support shaft 45 are rotatably supported by bearings 46 and 46 fixed to the bracket 18, whereby the scum collection box 42 can tilt . When the scum recovery box 42 is tilted forward about the support shaft 45, the front end side of the scum inlet 41 (the end portion on the scum inflow side, which is the upper end of the weir float 47 in this embodiment) is lowered to the water surface h. Sink down.

A hollow weir float 47 that functions as a weir is attached to the front end side of the scum inlet 41 of the scum recovery box 42. Due to the buoyancy of the weir float 47, the scum recovery box 42 tilts about the support shaft 45, and as shown in FIGS. 7 (1), 7 (2) and 7 (3), the scum inlet 41 Even if the water level of the sedimentation basin 100 fluctuates , the end on the scum inflow side (the upper end of the weir float 47) is always held at a position higher than the water surface h. In the figure, 48 is a balance weight.

When the fluctuation of the water level of the sedimentation basin 100 is not so large, the weir float 47 does not need to have a hollow float structure, and the height position of the scum inlet 41 is set on the water surface h with only the balance weight 48. It may be configured to keep.

The scum collection box 42 is disposed on a circular track through which the scraping plate 21 passes. When the scum is not collected, the scum inlet 41 faces directly upward and is positioned higher than the water surface h so that water does not enter. However, when the scum is collected, the scum inlet 41 Since the scraping plate 21 is inclined so as to face the direction in which the scraping plate 21 proceeds, the end portion on the inflow side is submerged below the water surface h , so that the scum can be swallowed. In order to change the posture of the scum inlet 41 in this way, a movable guide 50 having a pressing member 52 protruding downward is disposed at an upper position of the scum collection box 42 so as to be movable up and down. It can be tilted.

As shown in FIG. 6, the movable guide 50 has an upper surface serving as a guide surface 51 along the passage of the pressing roller 22, and includes four link mechanisms 53, front and rear and left and right supported by the bracket 18. 53, the guide surface 51 is supported at a position above the scum collection box 42 so as to be vertically movable in a state where the guide surface 51 is kept horizontal. In the figure, reference numeral 54 denotes a spring that urges each link 53 in the standing direction. A pressing member 52 is provided on the lower surface of the movable guide 50 so as to push the weir float 47 provided in the scum recovery box 42 from above to incline the scum inlet 41 in the direction in which the scraping plate 21 advances. Yes. In the illustrated pressing member 52, a pressing roller 52a is rotatably supported at the lower ends of the left and right leg portions 52b, 52b.

  When the scraping plate 21 is not approaching, the movable guide 50 is maintained at an upper standby position where the pressing member 52 does not contact the weir float 47 as shown in FIG. The end of the inlet 41 on the scum inflow side is positioned higher than the water surface h. When the scraping plate 21 approaches and comes to a position in front of the scum inlet 41, the pressing roller 22 rides on the guide surface 51 of the movable roller 50 and presses the movable guide 50 as shown in FIG. Then, it rolls on the guide surface 51. Since the movable guide 50 is pushed down during the period in which the pressing roller 22 rolls on the guide surface 51, the pressing member 52 presses the weir float 47 from above. As a result, the scum collection box 42 tilts around the support shaft 45 so as to face the direction in which the scraping plate 21 advances, and the end of the scum inlet 41 on the scum inflow side is submerged below the water surface h. When the end portion on the scum inflow side is submerged below the water surface h, a flow of water and scum toward the scum recovery box 42 occurs, and the scum flows into the scum recovery box 42. Furthermore, as the scraping plate 21 approaches the scum collection box 42, the scum is scraped into the scum collection box 42 from the scum inlet 41.

  When the scraping plate 21 reaches the scum inlet 41, the pressing roller 22 falls from the guide surface 51 of the movable guide 50, so that the movable guide 50 is moved by the restoring force of the springs 54, 54 as shown in FIG. ), The pressing member 52 returns again to the upper standby position where it does not contact the weir float 47. As a result, the weir float 47 is released from the pressing force of the pressing member 52, so the scum recovery box 42 returns to its original state, and the end of the scum inlet 41 on the scum inflow side is higher than the water surface h. Return.

  The length of the guide surface 51 of the movable guide 50 corresponds to the length of time for which the scum collection box 42 is maintained in an inclined state, that is, the length of time for which scum can be collected, and the amount of scum collected is large. In the case of a sedimentation basin, if the guide surface 51 is lengthened, the scum recovery time can be set longer. In the case of a sedimentation basin with a small scum collection amount, the scum collection time can be set short by shortening the guide surface 51.

  In addition to the above-described configuration, the scum recovery device 1 of this embodiment prevents the pressing roller 22 from being pushed back when the movable guide 50 is pressed down between the rake arm 15A and the pressing roller 22. A lock mechanism 60 is provided.

  As shown in FIGS. 4 and 9, the lock mechanism 60 is a chuck having a column 61 vertically provided on the rake arm 15 </ b> A and a pair of holding members 64 </ b> A and 64 </ b> B capable of holding the outer peripheral surface of the column 61. The mechanism 62 includes a chuck driving mechanism 70 that drives the chuck mechanism 62 while the pressing roller 22 rolls on the guide surface 51 of the movable guide 50.

  Each of the gripping members 64A and 64B has a concave curved gripping surface along the outer peripheral surface of the support column 61, and the base end portions of the gripping members 64A and 64B project from the support shaft 68A, 68B is rotatably supported. The substrate 67 is integrally attached to the front end portion of the support arm float 23, and the support column 61 projects through a through hole 72 formed in the substrate 67 and projects onto the substrate 67. Since the through hole 72 is formed to have a diameter sufficiently larger than the outer diameter of the column 61, the column 61 is not restrained by the through hole 72.

  The chuck driving mechanism 70 includes a driving plate 71 formed in series with one gripping member 64B, gears 63A and 63B integrally mounted on the lower surface of the base end portion of each grip member 64A and 64B, And a coil spring 65 for urging the holding member 64B away from the other holding member 64B. The gears 63A and 63B mesh with each other, and when one gripping member 64B rotates in a direction approaching the other gripping member 64A, the rotational force is transmitted to the other gripping member 64A via the gears 63A and 63B. The As a result, the gripping member 64A rotates in a direction opposite to the gripping member 64B, that is, in a direction approaching the gripping member 64B, and the support column 61 is gripped between the gripping members 64A and 64B facing each other.

  A guide roller 66 is provided at the tip of the drive plate 71. The guide roller 66 rides on a vertical guide plate 102 installed at a proper position in the settling basin 100 and rolls. The installation position and length of the guide plate 102 are set so that the guide roller 66 rides on the guide plate 102 when the pressing roller 22 rolls on the guide surface 51 of the movable guide 50. .

  In a state where the guide roller 66 is on the guide plate 102, the leading end side of the drive plate 71 is pushed, and as a result, the grip member 64B integrated with the drive plate 71 approaches the other grip member 64A, that is, FIG. The column 61 shown in FIG. On the other hand, in a state where the guide roller 66 does not ride on the guide plate 102, the pressure on the distal end side of the drive plate 71 is released and the tensile force of the coil spring 65 acts on the gripping member 64B. This is a state away from the gripping member 64A, that is, a state in which the column 61 shown in FIG. 9B is released.

  According to the lock mechanism 60 configured as described above, when the pressing roller 22 rolls on the guide surface 51 of the movable guide 50 as the support arm 20 turns, as shown in FIG. As a result of riding on the guide plate 102 and rolling, the gripping member 64B rotates in the direction of arrow a in FIG. When the gripping member 64B is rotated in the direction of the arrow a, the gripping member 64A is rotated in the direction of the arrow b in the figure in conjunction with this, so that the column 61 is gripped by the gripping members 64A and 64B. As a result, the support arm 20 is integrally connected and fixed to the rake arm 15 </ b> A, and the vertical displacement of the pressing roller 22 is restricted, so that the pressing roller 22 is pushed down without being pushed back by the movable guide 50. Rolls stably on the guide surface 51.

In the case of the large scum recovery box 42 , a large force is required to push the scum recovery box 42 by the pressing member 52 and tilt the scum inlet 41. Therefore, when the pressing roller 22 rolls the movable guide 50. The resistance from the scum recovery box 42 may be received and pushed back together with the support arm float 23. However, by incorporating the lock mechanism 60 described above, the vertical position of the pressing roller 22 is fixed while the pressing roller 22 rolls on the guide surface 51 of the movable guide 50, so that even with the large scum recovery box 42 . Even if it exists, the pressing roller 22 is pushed back and does not lift from the movable guide 50, and the scum inlet 41 can be tilted via the pressing member 52.

  When the pressing roller 22 falls off from the guide surface 51, as shown in FIG. 9 (2), the gripping member 64B is moved around the support shaft 68B by the restoring force of the coil spring 65 as shown by the arrow c in FIG. Rotate in the direction. When the gripping member 64B is rotated in the direction of the arrow c, the gripping member 64A is rotated in the direction of the arrow d in the same figure, so that the column 61 is released from the gripping members 64A and 64B. Thereby, since the integral connection of the support arm 20 and the rake arm 15A is released, the support arm 20 can be moved up and down according to the water level of the settling basin 100.

In the scum recovery device 1 having the above-described configuration, when the support arm 20 circulates in the sedimentation basin 100, the scraping plate 21 circulates on the water surface h integrally with the support arm 20 and floats near the water surface h of the sedimentation basin 100. Scrap scum. When the scraping plate 21 reaches a position in front of the scum inlet 41 of the scum recovery box 42 , the pressing roller 22 provided at the front position of the scraping plate 21 rides on the guide surface 51 of the movable guide 50 and moves. 50 is pushed downward and rolls on the guide surface 51 in this state. When the movable guide 50 is pushed down, the pressing member 52 provided on the movable guide 50 presses the weir float 47 downward in conjunction with it, so that the scum collection box 42 tilts and the scum inlet 41 is a scraping plate. It turns in the direction that 21 advances. As a result, the end portion of the scum inlet 41 on the scum inflow side is submerged below the water surface h, so that the scum scraped by the scraping plate 21 flows into the scum recovery box 42 from the scum inlet 41 and is discharged together with water. Is done.

  Thereafter, when the scraping plate 21 reaches the scum inlet 41, the pressing roller 22 falls from above the movable guide 50, and the movable guide 50 is raised to the original position by the restoring force of the spring 54. As a result, the pressing force applied to the weir float 47 by the pressing member 52 is released, so that the scum recovery box 42 returns to its original state and the scum inlet 41 faces upward. Inflow is blocked.

In the scum recovery device 1 having the above-described configuration, when the water level of the sedimentation basin 100 rises or falls, the height position of the scum inlet 41 of the scum recovery box 42 varies due to the buoyancy of the weir float 47. Accordingly, the scum inlet 41 is always kept at an upper position with respect to the water surface h. On the other hand, due to the buoyancy of the support arm float 23 attached to the support arm 20, the pressing roller 22 is displaced up and down following the fluctuation of the water level, so the position of the pressing roller 22 from the water surface h is kept constant. . Accordingly, the depth at which the inflow side end of the scum inlet 41 is submerged below the water surface h by the pressing roller 22 is kept substantially constant, and the amount of scum and water flowing into the scum inlet 41 is kept constant. .

It is a top view which shows the example which installed the scum collection | recovery apparatus which is one Example of this invention in the sedimentation basin of a sewage treatment facility. It is a longitudinal cross-sectional view of the Example of FIG. It is a top view which expands and shows the outer peripheral part of a sedimentation basin. It is a longitudinal cross-sectional view which expands and shows the outer peripheral part of a sedimentation basin. It is explanatory drawing which shows operation | movement of the support arm with respect to the fluctuation | variation of the water level of a sedimentation basin. It is a front view which shows the structure of a scum collection | recovery mechanism. It is explanatory drawing which shows operation | movement of the scum collection | recovery box with respect to the fluctuation | variation of the water level of a sedimentation basin. It is explanatory drawing which shows operation | movement of a scum collection | recovery mechanism. It is a top view which shows the structure and operation | movement of a locking mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scum collection | recovery apparatus 15A, 15B Rake arm 20 Support arm 21 Scraping plate 22 Press roller 23 Support arm float 40 Scum collection mechanism 41 Scum inlet 42 Scum collection box 47 Weir float 48 Balance weight 50 Movable guide 51 Guide surface 52 Press Member 53 Link mechanism 60 Lock mechanism 61 Post 62 Chuck mechanism 70 Chuck drive mechanism 100 Sedimentation basin

Claims (3)

In the scum recovery device, the scum floating near the water surface of the sedimentation basin is scraped by a scraping plate that circulates on the water surface in the sedimentation basin and introduced into the scum inlet arranged on the passage of the scraping plate.
A support arm that circulates in the settling basin;
A scraping plate provided integrally with the support arm at a rear position in the traveling direction of the support arm;
There is a scum inlet facing upward and a dam on the front end side of the scum inlet and held on the water surface during normal times, and can be tilted so that the scum inlet faces in the direction in which the scraping plate advances A scum collection box supported by
A float for a support arm that is attached to the support arm and displaces the tip of the support arm up and down in accordance with fluctuations in the water level of the settling basin;
A movable guide that has a horizontal guide surface on the upper surface and a pressing member that projects downward on the lower surface, and is supported above the scum recovery box so that the guide surface can be moved up and down via a link mechanism. ,
A guide that is supported by the tip of the support arm at a forward position in the direction of travel of the scraping plate, and that the movable guide is pushed down until the dam is pushed from above by the pressing member and the scum recovery box tilts. A pressing roller that rolls on the surface;
A spring that urges the link mechanism to stand up and returns the movable guide to its original state ;
The movable guide has a guide surface length so that the scum recovery box tilts when the scraping plate comes to a position before the scum inlet, and the scum recovery box returns to its original state when it reaches the scum inlet. A scum recovery device that is set. The scum recovery device according to claim 1, wherein a balance weight is attached to the scum recovery box , and a height position of the scum inlet is held on the water surface by the balance weight. 3. The scum recovery device according to claim 1, wherein the weir is formed by a float so that a height position thereof is displaced up and down in accordance with a change in a water level of the sedimentation basin .

Images