JP2021062318A - Sludge scraper - Google Patents

Abstract

To provide a sludge scraper where a structure for guiding a flight is improved.SOLUTION: In a sludge scraper 10: one or more of flights 30 are the flights for normal rotation with a flight normal rotation operation arm 101; one or more of the flights 30 are the flights for reverse rotation with a flight reverse rotation operation arm 102; a chain structure 20 is provided with one or more of flight normal rotation strikers 111 and one or more of flight reverse rotation strikers 112; a lower end of the flight for normal rotation is descended by acting the flight normal rotation striker 111 to the flight normal rotation operation arm 101 and lower ends of other flights 30 descend via a link rod 70; and the lower end of the flight for reverse rotation rises by acting the flight reverse rotation striker 112 to the flight reverse rotation operation arm 102 and the lower ends of other flights 30 rise via the link rod 70.SELECTED DRAWING: Figure 10

Description

The present invention relates to a sludge scraper used in a settling basin. The settling basin is, for example, a sewer or a water supply.

In order to remove the sludge accumulated on the bottom of the sedimentation basin, a sludge scraper is used to scrape the sludge upstream. As an example of the sludge scraper, those disclosed in Patent Documents 1 and 2, for example, are known.

The technique of Patent Document 1 has a total of four shafts, a drive shaft, an idler shaft, a take-up shaft, and an underwater shaft, arranged inside the settling basin to drive the flight. A guide rail will be installed at the bottom of the pond to guide the outbound flight, and a guide rail will be installed near the surface of the water to guide the return flight. FIG. 13 shows an example of a configuration using such a technique. 13 (a) is a front view and FIG. 13 (b) is a side view.

According to Patent Document 2, as a measure against sloshing, flight shoes are configured to sandwich the guide rail from both sides. In particular, a plate (guide plate with protrusions) is newly installed so that the head of the guide rail on the return route side is sandwiched between the protrusions and the protrusions on the return route side.

An example of sloshing damage in a settling basin is that the treated water swings due to an earthquake or the like, and the flight deviates from the guide rail due to this swing.

Japanese Patent No. 4536595 Japanese Patent No. 5727075

In the conventional technique, there are various problems regarding the structure for guiding the flight.
For example, as an issue related to workability, there is a problem related to construction at the bottom of a pond.

In the technique of Patent Document 1, as shown in FIG. 13, it is necessary to lay the guide rail near the bottom of the pond and the water surface. When installing the pond bottom guide rail 502, it is necessary to embed the pond bottom guide rail 502 in the pond bottom to reduce the gap between the flight and the pond bottom in order to reduce the amount of sludge left on the pond bottom.

To embed the pond bottom guide rail 502, after fixing the pond bottom guide rail 502 to the pond bottom with anchor bolts, pour unreinforced concrete over the entire pond bottom including the area around the pond bottom guide rail 502 to raise the pond bottom. The pond bottom guide rail 502 is embedded.

In order to improve the adhesion between this unreinforced concrete and the reinforced concrete of the settling basin, it is necessary to hang the entire bottom of the basin and roughen the surface, which takes a lot of time and effort.

Furthermore, after pouring unreinforced concrete, a curing period is required, but during this curing period, the work inside the pond, including the bottom of the pond, becomes impossible, and the work process is inevitably lengthened.

Also, when updating the existing chain flight type sludge scraper, the unreinforced concrete on the bottom of the pond is hung to replace the existing guide rail 502 on the bottom of the pond, and the existing guide rail 502 on the bottom of the pond is exposed and removed. It is necessary to do the work.

Another issue related to workability is related to the number of foundation bolts to be installed and work at height.

As shown in FIG. 13, a chain flight type sludge scraper as in Patent Document 1 has a total of four shafts, a drive shaft 503, an idler shaft 504, a take-up shaft 505, and an underwater shaft 506, in the pond.

Each shaft is fixed to the pond wall with foundation bolts. For this purpose, it is necessary to suspend the sedimentation basin, expose the reinforcing bars, and bind the foundation bolts to the exposed reinforcing bars. In addition, after fixing the shaft with foundation bolts, it is necessary to backfill and cure the skeleton with concrete.

Further, of the four shafts, the drive shaft 503 and the idler shaft 504 are arranged near the water surface about 3 m to 5 m from the bottom of the pond, so that a scaffolding for work at a high place is required at the time of construction.

It takes time to install and disassemble the work scaffolding at high places, and it takes time to raise and lower objects on the work scaffolding at high places and to raise and lower the workers, so the workability is worse than that of work not at high places.

In addition to the drive shaft 503 and idler shaft 504, parts to be installed in high places require a guide rail 501 on the return path side and a bracket for supporting it. is necessary.

In addition, there is a problem regarding sloshing countermeasures.
The technique of Patent Document 2 newly provides a plate (guide plate with protrusion) in which the protrusion is located at a position facing the protrusion of the shoe on the return path side as a measure against sloshing, but it is necessary to add an accessory to the flight. Because of this, the manufacturing and installation work of accessories becomes complicated.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a sludge scraper having an improved structure for guiding a flight.

An example of the sludge scraper according to the present invention is
In a sludge scraper that drives a chain structure with multiple flights to scrape sludge from the bottom of the settling basin.
The sludge scraper
A guide rail for movably supporting each of the above flights,
A bracket fixed to the side wall of the settling basin and supporting the guide rail,
A link rod that connects each of the above flights to each other and synchronizes the movement of each of the above flights.
With
One or more of the above flights are forward rotation flights equipped with a flight forward rotation operating arm.
One or more of the above flights are reversal flights equipped with a flight reversal actuating arm.
The chain structure comprises one or more flight forward strikers and one or more flight reverse strikers.
When the flight forward rotation striker acts on the flight forward rotation actuating arm, the lower end of the forward rotation flight is lowered, and the lower end of the other flight is lowered via the link rod.
When the flight reversing striker acts on the flight reversing actuating arm, the lower end of the reversing flight is raised, and the lower end of the other flight is raised via the link rod.
It is characterized by that.

According to the sludge scraper according to the present invention, a sludge scraper that has good workability and is less affected by sloshing because it does not require a pond bottom lifting work, foundation bolt construction work, and high-altitude work is provided. can do.

For example, regarding the construction at the bottom of the pond, an example of the sludge scraper according to the present invention has a flight suspension structure, and the flight has a structure of being suspended from the guide rail on the side wall of the pond, so that the guide rail at the bottom of the pond is unnecessary. This eliminates the need for fishing work (roughening work) at the bottom of the pond. In this way, workability is improved.

Further, regarding the number of foundation bolts to be installed and work at height, in an example of the sludge scraper according to the present invention, the flight is arranged only at the bottom of the pond and reciprocates in the scraping direction and the returning direction. Therefore, the number of shafts can be reduced from four to two, and the number of foundation bolts installed can be halved.

Further, since parts to be installed near the water surface (for example, the drive shaft 503, the idler shaft 504, the return route side guide rail 501, etc. in the conventional chain flight type sludge scraper shown in FIG. 13) are not required, the height at the time of installation is not required. No need for on-site work. In this way, workability is improved.

Further, regarding measures against sloshing, in an example of the sludge scraper according to the present invention, the flight is arranged only on the bottom of the pond where the influence of sloshing is small, and the flight is not arranged near the water surface where the influence of sloshing is large. It is possible to suppress flight deviations due to

A side view of the sludge scraper according to the first embodiment of the present invention. The plan view of the sludge scraper of FIG. The front view of the sludge scraper of FIG. Front view of the drive mechanism. The perspective view of the sludge scraper of FIG. 1 in the state where the flight is in the lowered position. The perspective view of the sludge scraper of FIG. 1 in the state where the flight is in the raised position. A partially enlarged view of FIG. The perspective view around the drive shaft device of FIG. The perspective view around the driven shaft device of FIG. The perspective view which shows the positional relationship of each arm and each striker. A side view illustrating the movement of the flight ascending. A side view illustrating the action of the flight descending. The figure which shows the structure of the conventional sludge scraper.

Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1.
FIG. 1 is a side view of the sludge scraper according to the first embodiment of the present invention. A sludge scraper 10 is installed in the settling basin 200. Hereinafter, for convenience of explanation, the left direction of the paper surface of FIG. 1 is the front direction, the right side of the paper surface of FIG. 1 is the rear direction, the upper direction of the paper surface of FIG. 1 is the upward direction, and the downward direction of the paper surface of FIG. 1 is the downward direction. The treated water flows from front to back in the direction of the white arrow in FIG.

The sludge scraper 10 is a sludge scraper that drives the chain structure 20 to scrape the sludge at the bottom of the sedimentation basin. A plurality of flights 30 are attached to the chain structure 20. Flight 30 is configured to be able to scrape sludge from the bottom of the pond forward. The sludge that has been scraped up is accumulated in, for example, a sludge pit 201 formed in front of the bottom of the pond. Although a plurality of flights 30 are provided, only one reference code may be indicated by the figure. The same applies to the components other than the flight 30.

The chain structure 20 is driven by the drive mechanism 40. The drive mechanism 40 includes a drive device 41, a drive shaft device 42, and a driven shaft device 43, and the drive device 41 is installed above the water of the settling basin 200. The position of the drive device 41 is not limited to that shown in the figure.

The sludge scraping machine 10 includes a scum scraping mechanism 80. The scum scraping mechanism 80 is attached to the chain structure 20. The scum scraping mechanism 80 includes a scum scraping plate 81. The scum scraping plate 81 is provided near the water surface, and scoops the scum on the water surface rearward to reach the scum collecting device 90. The scum collecting device 90 may be what is called a scum gap, and collects scum and discharges it to the outside of the settling basin 200. The scum collecting device 90 can be configured by using, for example, a scum pipe.

FIG. 2 is a plan view of the sludge scraper 10, and FIG. 3 is a front view of the sludge scraper 10. Note that the drive mechanism 40 is omitted in FIG. The sludge scraper 10 includes a guide rail 50 for movably supporting each flight 30. The guide rails 50 are rails extending in the front-rear direction, and are provided as a pair on the left and right sides to support both end portions or both end portions of each flight 30 from below and restrict upward movement. An example of a specific support structure by the guide rail 50 will be described later with reference to FIG. 7 and the like. Further, the sludge scraper 10 includes a bracket 60 that supports the guide rail 50. The bracket 60 is fixed to the side wall of the settling basin 200.

As shown in FIG. 1, the chain structure 20 is configured as a closed loop structure including a chain portion and an intermediate rod. In the present embodiment, the chain structure 20 includes a first chain portion 21, a second chain portion 22, a first intermediate rod 23, and a second intermediate rod 24. The first chain portion 21 is wound around the drive wheel in the drive shaft device 42, and the second chain portion 22 is wound around the driven wheel in the driven shaft device 43.

The first intermediate rod 23 is connected between the lower end of the first chain portion 21 and the lower end of the second chain portion 22. The second intermediate rod 24 is connected between the upper end of the first chain portion 21 and the upper end of the second chain portion 22.

FIG. 4 is a front view of the drive mechanism 40. As shown in FIG. 1, the drive wheel of the drive device 41 and the drive wheel of the drive shaft device 42 are connected by a motion transmission mechanism (belt, chain, etc.) (this motion transmission mechanism itself is not shown in FIG. 4). ), The rotation of the drive shaft of the drive device 41 is transmitted to the drive shaft of the drive shaft device 42. Further, another drive wheel of the drive shaft device 42 and the driven wheel of the driven shaft device 43 are connected by a chain structure 20, and the rotation of the drive shaft of the drive shaft device 42 is transmitted to the driven shaft of the driven shaft device 43. ..

Here, the conventional chain flight type sludge scraper requires a total of four shafts as shown in FIG. 13, but according to the sludge scraper 10 according to the present embodiment, the drive in the settling basin 200 is required. The number of rotating shafts of the mechanism 40 can be reduced to only two, that is, the drive shaft of the drive shaft device 42 and the driven shaft of the driven shaft device 43. Therefore, the entire work process related to the shaft can be reduced.

Furthermore, in the conventional chain flight type sludge scraper, it is necessary to arrange a part of the shaft (drive shaft and idler shaft) near the water surface about 3 m to 5 m from the bottom of the pond, so that a scaffolding for work at height is required at the time of construction. You will need it. On the other hand, according to the sludge scraper 10 according to the present embodiment, all the shafts in the settling basin 200 can be installed near the bottom of the basin. In this way, workability is improved.

As shown in FIG. 1, each flight 30 and the scum scraping mechanism 80 are connected to one of the first intermediate rod 23 and the second intermediate rod 24 (the first intermediate rod 23 in this embodiment). As the first intermediate rod 23 moves back and forth, each flight 30 and the scum gathering mechanism 80 move back and forth along the guide rail 50. Also, with respect to the first intermediate rod 23, each flight 30 is configured to be rotatable around its respective connecting shaft (described later with reference to FIGS. 11 and 12).

The sludge scraper 10 includes a link rod 70. The link rod 70 connects each flight 30 to each other and synchronizes the movement of each flight 30. That is, when a flight 30 rotates around a connecting shaft with the first intermediate rod 23, all flights 30 connected to the link rod 70 also rotate around their respective connecting shafts.

The rotation of the flight 30 in a certain direction is the rotation of lowering the flight 30 (particularly its lower end), which is hereinafter referred to as "normal rotation". Further, the rotation in the opposite direction is the rotation for raising the flight 30 (particularly the lower end thereof), and hereinafter, this is referred to as "reversal".

As shown in FIG. 2, in the present embodiment, a total of two link rods 70 are provided on both the left and right sides, and these are fixed to each other via the fixing structure 71. In the example of FIG. 2, the fixed structure 71 is a brace rod provided so as to intersect across the left and right sides, but the specific structure is not limited to this. For example, a quadrangular (square, rectangular or trapezoidal) plate may be arranged horizontally and the left and right link rods 70 may be fixed along two parallel sides.

FIG. 5 is a perspective view of the sludge scraper 10. In the sludge scraping machine 10 of FIG. 5, each flight 30 and the scum scraping mechanism 80 are in a lowered state. In this state, the position of the flight 30 (particularly the position of the lower end thereof, which is shown as the lower end 30c in FIGS. 11 and 12; the same applies hereinafter) is arranged at a low position where sludge at the bottom of the pond can be scraped. Further, the position of the scum scraping plate 81 is below the water surface as shown in FIGS. 1 and 3, and is arranged at a position where the scum on the water surface is not scraped. The front-rear positions of each flight 30 and the scum scraping mechanism 80 in FIG. 5 are different from those in FIG.

When the chain structure 20 rotates in this state and the first intermediate rod 23 moves forward, the flight 30 also moves forward, and sludge at the bottom of the pond can be scraped forward according to the position. ..

Here, as shown in FIGS. 1 and 5, the length of the first chain portion 21 is longer than the arrangement pitch of the flight 30. The length of the second chain portion 22 is also longer than the arrangement pitch of the flight 30. According to such a configuration, the movement range of each flight 30 overlaps the movement range of the adjacent flight 30 before and after, so that the entire surface of the pond bottom can be covered by the plurality of flights 30, for example, the movement range of the pond bottom. The sludge accumulated in the rear can be scraped to the sludge pit 201 in the front.

FIG. 6 is another perspective view of the sludge scraper 10. In the sludge scraping machine 10 of FIG. 6, each flight 30 and the scum scraping mechanism 80 are in a raised state. In this state, the position of the flight 30 (particularly the position of the lower end 30c thereof) is arranged at a high position that does not (or is difficult to contact) with the sludge at the bottom of the pond. Further, the scum scraping plate 81 is arranged at a high position including the water surface, and can scrape the scum on the water surface.

When the chain structure 20 rotates in this state and the first intermediate rod 23 moves rearward, the scum scraping plate 81 also moves rearward, and the scum on the water surface is scraped rearward according to the position. Can be done.

Here, as shown in FIGS. 5 and 6, in the present embodiment, a plurality of guide rails 50 (two in total in this example) are provided to support both sides of each flight 30, and similarly, a chain is provided. A plurality of first intermediate rods 23 of the structure 20 are also provided (two in total in this example) to support both sides of each flight 30. However, in the chain structure 20, only one first chain portion 21, the second chain portion 22, and the second intermediate rod 24 are provided (that is, only on one side). Further, only one drive mechanism 40 is provided (that is, only on one side). Therefore, as compared with the configuration in which the drive mechanism 40 and the entire chain structure 20 are arranged on both sides, the configuration is simplified and the workability is improved. However, as a modification, it is also possible to provide the drive mechanism 40 or the entire chain structure 20 on both sides.

As described above, according to the sludge scraper 10 according to the present embodiment, since the guide rail 50 is provided on the side wall of the settling basin 200 via the bracket 60, it is not necessary to fix the guide rail 50 to the bottom of the pond. Therefore, even when the sludge scraper 10 is installed, it is not necessary to hang the bottom of the settling basin 200 or to roughen the eyes. Further, since it is not necessary to newly use unreinforced concrete for the bottom of the pond, it is possible to avoid the situation where the work in the pond cannot be performed during the curing period, and the work process can be shortened. Further, when the sludge scraper 10 is renewed, the guide rail 50 can be replaced without working on the concrete at the bottom of the pond. In this way, workability is improved.

Further, according to the sludge scraper 10 according to the present embodiment, all the flights 30 are arranged near the bottom of the pond and do not move near the water surface, so that the influence of sloshing on the flight 30 can be suppressed. it can. Therefore, for example, an additional structure for sloshing countermeasures is not required.

FIG. 7 is a partially enlarged view of one end side of the flight 30 and the scum scraping mechanism 80 of FIG. Further, FIG. 8 is a perspective view of the periphery of the drive shaft device 42. Further, FIG. 9 is a perspective view of the periphery of the driven shaft device 43. As shown in FIG. 9, all flights 30 need not have the same shape and structure, for example, the rearmost flight 30 (particularly shown as flight 30a) may have a different shape.

As shown in FIGS. 7 to 9, the sludge scraper 10 is provided with connecting plates 31 for connecting the flight 30 and the guide rail 50 on both the left and right sides of each flight 30. Each flight 30 is supported by a guide rail 50 via a connecting plate 31.

The connecting plate 31 includes a guided portion, and the guided portion is movably supported by the guide rail 50. In the present embodiment, the guided portion is configured as the guide wheel 32 shown in FIG. The rollers of the guide wheel 32 are rotatably supported by the guide rails 50, so that the connecting plate 31 and the flight 30 are supported via the shaft of the guide wheel 32. The guided portion does not have to be configured to be rotatable like the guide wheel 32, and may be configured to be slidable in the guide rail 50, for example.

The connecting plate 31 is fixed to the first intermediate rod 23. Further, the flight 30 is rotatably connected to the connecting plate 31, and the position of the flight 30 changes as each flight 30 rotates. This rotation operation will be described later with reference to FIGS. 11 and 12.

As shown in FIG. 7, the sludge scraper 10 includes a flight forward rotation operation arm 101 and a flight reverse rotation operation arm 102. The flight forward rotation operating arm 101 is provided for one or more of the flights 30 (forward rotation flight). Further, the flight reversing operation arm 102 is also provided for one or more of the flights 30 (reversing flight). In this embodiment, they are provided one by one and are provided for the same flight 30. That is, in the present embodiment, one flight 30 functions as both a forward flight and a reverse flight.

These arms are fixed to flight 30. Therefore, the position of each arm changes according to the position of the flight 30 (for example, the rotation position). As a result, the height of each arm (for example, the height of the upper end) also changes.

The chain structure 20 includes one or more flight forward striker 111 and one or more flight reverse striker 112. These are provided on the side of the first intermediate rod 23 and the second intermediate rod 24 to which the flight 30 is not connected (the second intermediate rod 24 in the present embodiment). In this embodiment, these strikers are provided one by one. The flight forward rotation striker 111 may be provided in the same number as the flight forward rotation operation arm 101, and the flight reverse rotation striker 112 may be provided in the same number as the flight reverse rotation operation arm 102.

The flight forward rotation actuating arm 101 and the flight forward rotation striker 111 are arranged at positions in the left-right direction where they can interfere with each other. That is, when these front-rear positions and the height (particularly the height of the flight forward rotation operating arm 101) satisfy a predetermined relationship, they come into contact with each other and exert a mechanical force on each other.

Similarly, the flight reversing actuating arm 102 and the flight reversing striker 112 are also arranged at positions in the left-right direction where they can interfere with each other. On the other hand, as shown in FIG. 7, the flight forward rotation operating arm 101 and the flight reverse rotation striker 112 have different positions in the left-right direction and do not interfere with each other. Similarly, the flight reverse rotation actuating arm 102 and the flight forward rotation striker 111 also have different positions in the left-right direction and do not interfere with each other.

FIG. 10 is a perspective view showing the positional relationship between the flight forward rotation operation arm 101, the flight reverse rotation operation arm 102, the flight forward rotation striker 111, and the flight reverse rotation striker 112 in the present embodiment. In this example, as described above, the flight forward rotation actuating arm 101 and the flight reverse rotation actuating arm 102 are provided on the same flight 30. Further, in this example, the flight forward striker 111 is provided behind the flight reverse striker 112.

The operation of ascending the flight 30 will be described with reference to FIG. Note that the flight 30 shown in FIG. 11 includes both a flight forward rotation operating arm 101 and a flight reversing operating arm 102 in the present embodiment, but for convenience of explanation, only the flight reversing operating arm 102 is shown in FIG. The flight forward rotation operating arm 101 is not shown.

FIG. 11A shows a state in which the flight 30 is in the lowered position. The flight reversal striker 112 is located in front of the flight reversal actuating arm 102. The lower end 30c of the flight 30 is located near the bottom of the pond.

The flight 30 is rotatably connected to the connecting plate 31 via a connecting shaft 33. The guide wheel 32 of the connecting plate 31 can be moved back and forth along the guide rail 50 (not shown in FIG. 11). When the first intermediate rod 23 moves forward in response to the drive of the drive mechanism 40, the flight 30 also moves forward. As a result, Flight 30 scrapes the sludge from the bottom of the pond forward.

On the other hand, the second intermediate rod 24 moves rearward, and the flight reversal striker 112 also moves rearward.

Due to these movements, the flight reversing actuating arm 102 and the flight reversing striker 112 eventually come into contact with each other. FIG. 11B shows a state in which a slight amount of time has passed since the contact. The flight reversing actuating arm 102 is pushed rearward by the flight reversing striker 112, which causes the flight 30 to rotate around the connecting shaft 33. As a result of this rotation, the flight 30 (particularly its lower end 30c) rises.

Here, since the link rod 70 is connected to the flight 30, the position of the link rod 70 with respect to the first intermediate rod 23 also changes according to the rotation of the flight 30. More precisely, the flight 30 is connected to the link rod 70 via the connecting shaft 72, and the position of the connecting shaft 72 changes according to the rotation of the flight 30.

Further, since all the flights 30 are connected to the link rod 70, the other flights 30 also receive a force via the link rod 70 and are used for reversing flights (of the flights 30 having the flight reversing operating arm 102). Rotate in the same way as. As a result, all flights 30 rise as shown in FIG. 11 (b).

As described above, when the flight reversing striker 112 acts on the flight reversing actuating arm 102, the lower end 30c of the reversing flight rises, and the lower end 30c of the other flight 30 also rises via the link rod 70.

FIG. 11 (c) shows a state in which a further time has passed from FIG. 11 (b). The flight reversing actuating arm 102 is pushed further rearward, further raising the flight 30.

Here, each flight 30 and the link rod 70 are raised by the gravity acting on each flight 30 and the link rod 70 when each flight 30 (particularly its lower end 30c) is in an elevated position. It is connected so that the position is maintained. That is, the link rod 70 is a component that also acts as a counterweight, and can also be called a weight rod.

Specific design values for realizing such an action will not be described in particular, but those skilled in the art can appropriately design. For example, in consideration of the weight of the flight 30 and its distribution, the weight of the link rod 70 and its distribution, the axial position of the guide wheel 32, the position of the connecting shaft 33, the position of the connecting shaft 72, etc. This can be achieved by setting the moment within an appropriate range.

By adopting the structure utilizing gravity in this way, the configuration for controlling the operation of the flight 30 can be simplified. For example, no additional structure or the like is required to keep the flight 30 in an elevated position.

At the time of FIG. 11C, or after a predetermined margin time has elapsed, the drive mechanism 40 reverses the drive direction. The flight 30 then moves backwards and the flight reversal striker 112 moves forwards. However, since the flight reversing actuating arm 102 is lowered to or below the position shown in FIG. 11C, it does not come into contact with the flight reversing striker 112 and passes each other.

The operation of the flight 30 descending will be described with reference to FIG. Note that the flight 30 shown in FIG. 12 is the same as the flight 30 shown in FIG. 11 in the present embodiment, and includes both the flight forward rotation operating arm 101 and the flight reverse rotation operating arm 102, but for convenience of explanation. , FIG. 12 shows only the flight forward rotation operation arm 101, and the flight reverse rotation operation arm 102 is not shown.

FIG. 12A shows a state in which Flight 30 is in an elevated position. This corresponds to the state of FIG. 11 (c). The flight forward rotation striker 111 is in contact with the flight forward rotation operation arm 101 from behind the flight forward rotation operation arm 101.

When the first intermediate rod 23 moves rearward in response to the drive of the drive mechanism 40, the flight 30 also moves rearward. On the other hand, the second intermediate rod 24 moves forward, and the flight forward striker 111 also moves forward.

FIG. 12B shows a state in which a slight amount of time has passed from FIG. 12A. The flight forward rotation actuating arm 101 is pushed forward by the flight forward rotation striker 111, which causes the flight 30 to rotate around the connecting shaft 33. As a result of this rotation, the flight 30 (particularly its lower end) descends.

As described with reference to FIG. 11, the other flight 30 also receives a force via the link rod 70 and is provided with a forward rotation flight (of the flight 30, the flight forward rotation operating arm 101 is provided, and in the present embodiment, the flight is reversed. It rotates in the same manner as the flight 30), which is the same as the flight for. As a result, all flights 30 descend as shown in FIG. 12 (b).

As described above, when the flight forward rotation striker 111 acts on the flight forward rotation operating arm 101, the lower end 30c of the forward rotation flight is lowered, and the lower end 30c of the other flight 30 is also lowered via the link rod 70.

FIG. 12 (c) shows a state in which more time has passed since FIG. 12 (b). The flight forward rotation operating arm 101 is pushed further forward, and the flight 30 is further lowered. This corresponds to the state of FIG. 11 (a).

Further, when the flight 30 rotates to the position shown in FIG. 12 (c), the flight 30 and the connecting plate 31 come into contact with each other. More specifically, the support end 31a of the connecting plate 31 contacts the rear surface 30b of the flight 30 and supports the rear surface 30b from the rear to the front. Here, since the flight 30 and the connecting plate 31 are connected via the connecting shaft 33, the flight 30 and the connecting plate 31 are fixed to each other by the support end 31a supporting the rear surface 30b. In this way, the connecting plate 31 limits the range of motion (eg, rotational range) of the flight 30.

At the time of FIG. 12 (c), or after a predetermined margin time has elapsed, the drive mechanism 40 reverses the drive direction. After that, the flight 30 moves forward, and the flight forward striker 111 moves backward. However, since the flight forward rotation operating arm 101 is lowered to the position shown in FIG. 12 (c), it does not come into contact with the flight forward rotation striker 111 and passes each other.

When the flight 30 moves forward in this way, the sludge at the bottom of the pond can be scraped forward again. This state corresponds to FIG. 11 (a). At this time, since the support end 31a of the connecting plate 31 supports the rear surface 30b of the flight 30 from the rear to the front, the connecting plate 31 receives the sludge from the flight 30 when the flight 30 scrapes the sludge. The range of motion (for example, rotation range) of the flight 30 is limited against the force, that is, the situation where the flight 30 is pushed by sludge or the like and moves (for example, the lower end 30c rotates backward) is prevented.

With such a support structure, the configuration for controlling the operation of the flight 30 can be simplified. That is, the connecting plate 31 for connecting the flight 30 to the first intermediate rod 23 can also be used as a maintenance structure for maintaining the flight 30 in the lowered position, and the number of parts can be reduced.

In the present embodiment, the position of the scum scraping mechanism 80 is configured to change according to the change in the position of the flight 30. Hereinafter, the operation of the scum scraping mechanism 80 will be described.

As shown in FIGS. 7 and 10, the scum scraping mechanism 80 includes a sliding shaft 82, a movable frame 83, and a connecting member 84. The sliding shaft 82 is fixed to the connecting plate 31. The connecting member 84 connects the flight 30 and the movable frame 83 (Note that FIG. 7 shows only the portion of the connecting member 84 that is connected to the movable frame 83). The movable frame 83 is configured to fit with the sliding shaft 82 and slide in a predetermined sliding direction with respect to the sliding shaft 82. The sliding direction is, for example, a vertical direction, but may be an oblique direction including a front-back direction component. A scum scraping plate 81 is fixed to the upper end of the movable frame 83.

As described with respect to FIG. 11, when the flight 30 is raised by the flight reversing striker 112 acting on the flight reversing actuating arm 102, the connecting member 84 is also raised accordingly. As a result, the movable frame 83 is lifted, the scum scraping plate 81 rises and reaches the water surface, and is arranged at a position where the scum on the water surface is scraped. That is, the flight reversing striker 112 acts on the flight reversing actuating arm 102, so that the scum scraping plate 81 rises. In this way, the ascending operation of the scum scraping plate 81 is synchronized with the ascending operation of each flight 30.

When the scum scraping plate 81 moves backward in a raised state, the scum on the water surface can be scraped backward and collected by the scum collecting device 90.

On the other hand, as described with respect to FIG. 12, when the flight 30 descends due to the flight forward striker 111 acting on the flight forward actuating arm 101, the connecting member 84 also descends accordingly. As a result, the movable frame 83 is pulled down, the scum scraping plate 81 is lowered and submerged, and the scum on the water surface is arranged at a position where the scum is not scraped. That is, the flight forward rotation striker 111 acts on the flight forward rotation operation arm 101, so that the scum scraping plate 81 is lowered. In this way, the lowering motion of the scum scraping plate 81 is also synchronized with the lowering motion of each flight 30.

At the position where the scum scraping plate 81 is lowered, even if the scum scraping plate 81 moves forward, the scum is not scraped forward.

In this way, by synchronizing the operation of the scum scraping plate 81 with the operation of the flight 30, the overall configuration can be simplified. For example, it is not necessary to install a scum scraping mechanism 80 or a dedicated driving device for driving the scum scraping plate 81.

The vertical movement structure using such a sliding shaft and a movable frame can also be used for a part or all of the flight 30. For example, the rearmost flight 30 shown in FIG. 9 (particularly shown as flight 30a) may be repositioned by moving the movable frame up and down according to the operation of the link rod 70. In such a case, the flight 30a does not rotate around the connecting shaft 33 with the connecting plate 31 as in the other flights 30, but translates in the direction of the sliding shaft.

The vertical movement structure using such a sliding shaft and a movable frame may be configured not to be used for any of the flights 30. That is, the rearmost flight 30 (particularly shown as flight 30a) may be configured to operate in the same manner as other flights 30. In this case, all flights 30, including the rearmost one, may be rotatably connected to the connecting plate 31 via the connecting shaft 33.

10 ... Sludge scraper 20 ... Chain structure 21 ... 1st chain part 22 ... 2nd chain part 23 ... 1st intermediate rod 24 ... 2nd intermediate rod 30 (30a) ... Flight 30b ... Flight rear surface 30c ... Flight lower end 31 ... Connecting plate 32 ... Guide wheel 40 ... Drive mechanism 50 ... Guide rail 60 ... Bracket 70 ... Link rod 71 ... Fixed structure 80 ... Scum scraping mechanism 81 ... Scum scraping plate 82 ... Sliding shaft 83 ... Movable frame 84 ... Connecting member 90 ... Scum collector 101 ... Flight forward rotation operation arm 102 ... Flight reverse rotation operation arm 111 ... Flight forward rotation striker 112 ... Flight reverse rotation striker 200 ... Settling basin 201 ... Sludge pit

Claims (6)

In a sludge scraper that drives a chain structure with multiple flights to scrape sludge from the bottom of the settling basin.
The sludge scraper
A guide rail for movably supporting each of the above flights,
A bracket fixed to the side wall of the settling basin and supporting the guide rail,
A link rod that connects each of the above flights to each other and synchronizes the movement of each of the above flights.
With
One or more of the above flights are forward rotation flights equipped with a flight forward rotation operating arm.
One or more of the above flights are reversal flights equipped with a flight reversal actuating arm.
The chain structure comprises one or more flight forward strikers and one or more flight reverse strikers.
When the flight forward rotation striker acts on the flight forward rotation actuating arm, the lower end of the forward rotation flight is lowered, and the lower end of the other flight is lowered via the link rod.
When the flight reversing striker acts on the flight reversing actuating arm, the lower end of the reversing flight is raised, and the lower end of the other flight is raised via the link rod.
A sludge scraper that is characterized by this. The sludge scraper comprises, for each flight, a connecting plate that connects the flight to the guide rail.
The connecting plate includes a guided portion and
The guided portion is movably supported by the guide rail and is supported.
The sludge scraper according to claim 1, wherein the connecting plate limits the range of motion of the flight against the force that the flight receives from the sludge when the flight attracts sludge. When the lower end of each flight and the link rod are in an elevated position, the gravity acting on each flight and the link rod maintains the height position of the lower end of each flight. Connected to,
The sludge scraper according to claim 1. A scum scraping plate that attracts scum on the water surface is further attached to the chain structure.
When the flight forward rotation striker acts on the flight forward rotation actuating arm, the scum scraping plate is lowered, and the scum scraping plate is lowered.
When the flight reversing striker acts on the flight reversing actuating arm, the scum scraping plate is raised.
The sludge scraper according to claim 1. The chain structure includes a first chain portion, a second chain portion, a first intermediate rod, and a second intermediate rod.
Each of the flights is connected to the first intermediate rod.
The second intermediate rod is provided with the flight forward striker and the flight reverse striker.
The length of the first chain portion and the length of the second chain portion are both longer than the arrangement pitch of the flight.
The sludge scraper according to claim 1. A plurality of guide rails are provided to support both sides of each flight.
Only one chain structure is provided.
The sludge scraper according to claim 1.

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