JP3315682B2 - Sludge scraper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge scraper for scraping sludge settled at the bottom of a sedimentation pond used in a sewer system or the like.

[0002]

2. Description of the Related Art Conventionally, a sludge scraper used in a sedimentation pond of a sewer system or the like is disclosed in Japanese Utility Model Publication No. 63-3360.
No. 4 is known. In this sludge scraper, a large number of scraping blades are swingably suspended on a sliding rod that reciprocates along the longitudinal direction of the sedimentation tank, and a stopper is provided on the back side of each scraping blade. Configuration. Then, when the sliding rod is moved toward the mud collecting section provided at the bottom of the pond, each of the scraping blades is prevented from swinging to the rear side by the stopper, and is kept in the vertical position while maintaining the vertical posture. It moves toward and the accumulated sludge is swept up. On the other hand, when the sliding rod is moved in the direction opposite to the sludge collecting section, each of the scraping blades is inclined so that the lower part thereof can be lifted by the resistance of the accumulated sludge, and the sludge is moved by moving in this state. Scratching back is suppressed.

[0003]

However, in such a sludge scraper, when the sliding rod is moved in the direction opposite to the sludge collecting section, the scraper blades are inclined by the resistance of the accumulated sludge. Therefore, at least the upper part of the accumulated sludge comes into contact with the raked blade. For this reason,
There is a problem that a part of the accumulated sludge is scraped back by the swirling blades, and is also wound up and diffused in water, thereby lowering the efficiency of scraping to the sludge collecting part.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a sludge scraper capable of reliably and efficiently scraping sludge.

[0005]

In order to solve the above-mentioned problems, a sludge scraper according to the present invention is supported by a plurality of guide rollers disposed on a side wall of a sedimentation basin, and is driven by the guide rollers. The frame can be slid in the direction, and the tip can be swung by the frame so that the tip can be changed to one of a scraping position in which the tip is located near the pond bottom and a return position in which the tip is separated from the pond bottom. A plurality of scrapers attached to the frame, and the plurality of scrapers are rotatably connected at a height position different from a swing fulcrum position of the plurality of scrapers with respect to the frame, and the plurality of scrapers are relatively rotatable with respect to the frame in the scraping direction. An interlocking rod that interlocks the plurality of scrapers to change the posture by intermittently displacing the plurality of scrapers; An operation drive source for applying a reciprocating slide operation drive force along the sludge scraping direction to the plurality of scrapers at a height position different from the swing fulcrum position with respect to the frame, and When the reciprocating sliding operation driving force is applied to the scraper, the plurality of scrapers are configured to interlock with each other via the interlocking rod, change their posture, and then slide together with the frame in the sludge scraping direction. It is characterized by the following.

According to such a sludge scraper, the plurality of scrapers are connected by the interlocking rod at a height different from the swinging point with respect to the frame. First, the posture is changed in conjunction therewith, and thereafter, the sliding operation is performed in the sludge scraping direction. That is, at the time of the scraping operation toward the sludge pit or the like, each of the scrapers is brought into the scraping posture in advance and then slid, whereby the sludge can be reliably scraped. On the other hand, at the time of return operation in the direction away from the sludge pit etc., each scraper slides after returning its tip to the pond bottom, and each scraper slides sludge settled on the pond bottom. It will pass above. Therefore, it is possible to prevent the sludge from being scraped back and the sludge from being wound up in the water during the return operation, and to efficiently scrape the sludge by repeating the scraping operation and the return operation.

Further, since the scraper passes over the sludge during the return operation, the scraper can be slid at an arbitrary return speed without scraping back the sludge or winding it up in the water.

Further, since the frame is supported by guide rollers provided on the side wall of the sedimentation basin, rails and the like for supporting and guiding the frame are not required at the bottom of the sedimentation basin. By making the pond bottom a mere plane, it is possible to reduce the construction cost.

In such a sludge scraper, it is desirable that the scraping attitude is such that the tip of the scraper is located at a height position where it does not contact the bottom of the pond.

[0010] In this case, the tip of the scraper does not contact the bottom of the pond in any of the scraping posture and the returning posture, so that the scraper is not damaged by contact with the pond bottom, and maintenance work is reduced. It is possible to extend the life of the device. In addition, since it is not necessary to form the bottom of the pond excessively smooth in order to prevent the damage of the scraper, the surface finishing step of the pond bottom and the like can be omitted, and the construction cost of the settling pond can be reduced.

Further, in such a sludge scraper, one of the plurality of scrapers is configured as a driving scraper to which a sliding operation driving force is given from the operation driving source, and the other scrapers are It is preferable that the attitude of the drive scraper be changed in conjunction with a change in the attitude of the drive scraper via an interlocking rod.

With this configuration, the weight of the interlocking rod for interlocking the plurality of scrapers can be substantially supported by the guide rollers on the side walls of the sedimentation basin via the frame, and the operation drive source is provided for the plurality of scrapers. Since only one of the driving scrapers needs to be provided with the sliding operation driving force, the sliding operation driving force of the operation driving source can be efficiently transmitted to the plurality of scrapers via the driving scraper.

In such a sludge scraper, the plurality of scrapers are attached to the plurality of scrapers so as to swing together with the plurality of scrapers, and when the plurality of scrapers take a scraping attitude, A balance weight that biases the plurality of scrapers by their own weight in the swinging operation direction to the side, and in the swinging operation direction on the return posture side when the plurality of scrapers take a return posture. desirable.

With this structure, the scraper can be stuck and returned in a stable manner with a simple structure in which the balance weight is simply attached, so that the sludge can be more reliably scraped and the sludge can be reliably scraped back. Return operation can be performed without the need.

Further, in such a sludge scraper, the operation drive source has a drive shaft that rotates at a substantially constant speed, and the rotation of the drive shaft is converted into a reciprocating slide operation and transmitted to the plurality of scrapers. It is desirable to be constituted so that.

With this configuration, the operation drive source for causing the scraper to perform the sludge scraping operation and the return operation can have a simple configuration in which the drive shaft is rotated at a substantially constant speed.
Cost reduction can be achieved. Note that, as described above, the scraper is in a pre-scraping posture during the scraping operation, and is in a pre-return posture during the return operation, so that the speed of the reciprocating slide operation is obtained by converting the rotational operation at a substantially constant speed. Sludge is surely scraped during scraping, and sludge is not scraped or rolled up during return operation.

Further, such a sludge scraper includes a scum scraper that scrapes scum floating near the surface of the sedimentation basin, and the scum scraper is driven by the drive shaft of the operation drive source. It is desirable to be configured so that:

In this manner, the scum floating near the water surface of the sedimentation basin can be raked and collected, and the drive source for raked the scum near the water surface can be shared with the drive source for raked the sludge at the bottom of the pond. Thus, cost reduction as a whole can be achieved. In addition, since the drive shaft of the operation drive source rotates at a substantially constant speed, the scum scraping device can be operated at a substantially constant speed, whereby a reliable scum scraping operation can be realized.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a sludge scraper according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view of the sludge scraper, and FIG. 2 is a schematic side view of the sludge scraper. As shown in these figures, this sludge scraper is a sludge scraper body 10 that scrapes sludge M settled on the bottom of a sedimentation tank 1 toward a sludge pit 2 provided on one side of the bottom of the settling tank 1. And a scum scraper 50 for scraping the scum S floating near the water surface toward the trough 3 provided near the water surface of the sedimentation basin 1, and driving the sludge scraper body 10 and the scum scraper 50. And a drive source 60.

The sludge scraper main body 10 includes a frame 20 supported so as to be slidable in the longitudinal direction of the sedimentation basin 1 (sludge scraping direction toward the sludge pit 2; left and right directions in FIG. 1) near the bottom of the pond. A plurality of scrapers (scraping blades) 30 swingably attached to the frame 20.
And an interlocking rod 40 for interlocking the plurality of scrapers 30 to change the posture.

The frame 30 is slidably supported in a sludge sweeping direction by a plurality of support brackets 24 provided on the pond wall near the pond bottom.

FIG. 3 is a detailed view of the support structure on both sides of the frame 20.

As shown in FIG. 3 and the like, the frame 20 has U-shaped frames 21 and 21 extending on both sides thereof in the longitudinal direction of the sedimentation basin (the direction in which the sludge is drawn), and as shown in FIGS. In the width direction of the sedimentation basin (the direction perpendicular to the paper of FIG. 1, FIG. 2,
Left and right U-shaped frame members 21 and 21
. Are connected to each other.

As shown in FIG. 3, the support bracket 24 has a roller support 242 mounted on a bracket base 241 provided below the pond wall near the bottom of the pond, and the guide roller 25 is rotatably mounted on the roller support 242. Is attached.

The guide roller 25 supports the U-shaped frame 21 inside the U-shaped frame 21 of the frame 20 and rotates the guide roller 25 to slide the frame 20 in the sludge scraping direction. We support as much as possible.

FIG. 4 is a front view showing the details of the mounting structure of the scraper 30, FIG. 5 is a side sectional view showing the details of the mounting structure of the scraper 30, and FIG. 6 explains the operation of the balance weight 35 mounted on the scraper 30. FIG.

As shown in FIGS. 4 and 5, the scraper 30 includes a blade main body 31 covering substantially the entire width of the sedimentation basin, and the blade main body 3 near the left and right ends of the blade main body 31.
And an interlocking link 32 integrally connected to the frame 1 and attached to a scraper support 27 provided below the U-shaped frame 21 of the frame 20 via a swing shaft 33. The scraper 30 swings by using the swing shaft 33 as a swing fulcrum, so that the tip of the blade body 31 is in the vicinity of the bottom of the pond, and is located at a height that does not contact the pond. (The position shown by the solid line in FIG. 4)
And a return posture (a posture indicated by a dashed line in FIG. 4) in which the tip of the blade main body 31 is separated from the bottom of the pond. The swinging operation range of the scraper 30 is regulated by stoppers 29, 29 described later, within an angle range between a scraping posture and a returning posture.

As shown in FIG. 5, balance weights 35 are attached to the left and right sides of the scraper 30 and inside the U-shaped frame 21 of the frame 20 so as to protrude substantially upward. . This balance weight 35
As shown in FIG. 6A, when the scraper 30 takes the scraping posture, the scraper 30 urges the scraper 30 in the swinging direction toward the scraping posture side by its own weight, while FIG. As shown in the drawing, when the scraper 30 assumes the return position, the weight of the scraper 30 urges the scraper 30 in the swinging direction toward the return position. Thus, in combination with the fact that the swinging operation range of the scraper 30 is restricted to the angle range between the scraping posture and the returning posture,
It is configured to be stable in any of the scraping posture and the returning posture.

As shown in FIG. 4, the connecting rod 40 is provided with an interlocking link 32 of each of the scrapers 30.
For pivotal connection. The height position (connection height position) of the rotating shafts 34 is higher than the swing shafts 33. When the connecting rod 49 is displaced relative to the frame 20 in the sludge sweeping direction,
The postures of the scrapers 30 are changed to a scraping posture and a returning posture in conjunction with each other.

FIG. 7 is a front view showing the details of the mounting structure of a drive scraper 30 'of the scrapers 30 to which a reciprocating slide operation driving force is applied from the drive source 60 in the sludge scraping direction.

As shown in FIG. 7, the driving scraper 30 'has a blade main body 31' extending over substantially the entire width of the sedimentation basin and a blade main body 31 'similar to the other scrapers 30 shown in FIG. The blade body 3 near the left and right ends
And a drive link 36 integrally coupled to the frame 1 and attached to a scraper support 27 provided below the U-shaped frame 21 of the frame 20 via a swing shaft 33 '. And, this drive scraper 30
Is swung with the swing shaft 33 'as a swing fulcrum, so that the tip of the blade body 31' is in a scraping position (position indicated by a solid line in FIG. 7) near the bottom of the pond, and the blade body 31 '
Can be changed to any one of a return posture (a posture indicated by a dashed line in FIG. 7) in which the tip of is separated from the pond bottom.

The drive link 36 of the drive scraper 30 'is longer than the interlocking links 32 of the other scrapers 30. The drive link 36 is provided at the upper end thereof.
0, a driving rod 67 that is reciprocally slid in the sludge scraping direction is rotatably connected by a rotating shaft 37,
In the middle part in the longitudinal direction, the interlocking rod 40 is
It is rotatably connected by 4 '. Therefore,
The drive link 36 of the drive scraper 30 ′ is provided with a reciprocating slide drive force in the sludge scraping direction from the drive source 60 via the drive rod 67, so that the drive scraper 30 ′ can move between the scraping posture and the returning posture. And the other scrapers 30... Interlock with the attitude changing operation of the driving scraper 30 ′ via the interlocking rod 40 to change the attitude to one of the scraping attitude and the returning attitude. Become.

As shown in FIG. 7, the drive scraper 30 'is attached to the portion where the drive scraper 30' is attached.
Stoppers 29, 29 for restricting the swinging operation range of the frame 20 with respect to the frame 20 are mounted so as to protrude laterally from the U-shaped frame 21 of the frame 20 via the mounting plates 28, 28. The stoppers 29, 29 are made of, for example, elastic rubber or the like, and come into contact with the drive link 36 of the drive scraper 30 'in the scraping posture and the return posture, respectively, so as to regulate the swing operation range of the drive scraper 30'. ing. As described above, since the other scrapers 30... Swing together with the drive scraper 30 ′ via the linkage rod 40, the respective swing operation ranges are adjusted by the stoppers 29, 29. And the return attitude is restricted to an angle range.

As shown in FIGS. 1 and 2, the drive source 60 is a drive motor 6 installed on the upper surface of the ceiling of the settling tank 1.
1, a drive shaft 62 driven at substantially constant speed by a drive motor 61 via a chain, and converting the rotation into a reciprocating slide operation along a sludge scraping direction toward the drive rod 67, And a link mechanism for transmitting to the scraper 30 '.

Specifically, the link mechanism includes a drive shaft 6
2 and the rotating disk 63
The first link 6 is pin-coupled to the vicinity of the outer periphery of the first link 6 and reciprocates in a substantially vertical direction by the rotation of the rotary disk 63
4 and a substantially L-shape, and a bent portion thereof is rotatably attached to a link bracket 65 provided on a side wall of the sedimentation basin, one end is pin-connected to the first link, and the other end is the drive And a second link 66 attached to the rod 67.

With the driving source 60 configured as described above, the driving scraper 30 ′ can move the driving rod 6 regardless of the direction of rotation of the driving motor 61 and the driving shaft 62.
7, a reciprocating sliding operation force is applied to the rotating shaft 37 at the upper end of the drive link 36 along the sludge scraping direction.

Next, the operation of the sludge scraper main body 10 by the driving force of the driving source 60 will be described with reference to FIGS.

FIG. 8 shows the final state of the return operation in which the sludge scraper main body 10 has moved to the most return position side. In this state, the substantially L-shaped second link 66 is
The drive rod 67 is located at the position where the drive rod 67 is most slid in the direction away from the sludge pit 2 (return operation direction) in the angular range of the swing rotation operation (the position where the drive rod 67 is swung leftmost in FIG. 8). The driving scrapers 30 'and the other scrapers 30 have a return posture in which the tips of the blade bodies 31', 31 ... are separated from the bottom of the pond.

FIG. 9 shows the driving source 60 from the state shown in FIG.
As a result, the substantially L-shaped second link 66 swings and rotates within a predetermined angle range, and the drive rod 67 slides in a direction approaching the sludge pit 2 (scraping operation direction).
.. Show a state in which each of the scrapers 30 ′, 30. That is, FIG.
When the drive rod 67 starts sliding in the direction of the scraping operation from the state shown in FIG. 7, this sliding operation driving force first acts on the upper end of the drive link 36 of the drive scraper 30 '. Then, the drive scraper 30 'swings with the other scrapers 30 via the interlocking rod 40 to take a scraping posture. In addition, the scrapers 30 ', 30 ...
Until the end of the posture changing operation, the frame 20 does not slide and stops at the same position as in FIG.

FIG. 10 shows the state of the driving source 6 from the state shown in FIG.
0, the second link 66 having a substantially L-shape allows the drive rod 67 to move the sludge pit 2 within the angular range of the swing rotation operation.
Swings to the position where it slides most in the direction approaching (the direction of the scraping operation) (the position where it swings rightmost in FIG. 10), and the driving rod 67 slides in the direction of approaching the sludge pit 2 (the direction of the scraping operation). .., The respective scrapers 30 ′, 30... Slide in the sludge scraping direction together with the frame 20 while maintaining the scraping posture, and the sludge settled on the bottom of the pond is shown. That is, as shown in FIG. 9, when the scrapers 30 ', 30... Are brought into the scraping posture state, the driving scraper 30' cannot be further displaced by the stopper. Therefore, the scrapers 30 ', 30 ...
After the scraper is in the scraping posture, drive scraper 3
When a slide operation drive force in the scraping direction is given to the drive link 36 of 0 ′, the slide operation drive force
The frame 20 slides together with each of the scrapers 30 ′, 30. At this time, since each of the scrapers 30 ', 30 ... is in a scraping posture in which the blade bodies 31', 31 ... are located near the bottom of the pond, the sludge settled on the bottom of the pond is surely scraped toward the sludge pit 2 side. Can be

FIG. 11 shows a state in which the drive source 60 rotates the substantially L-shaped second link 66 by a predetermined angle from the state shown in FIG. 10 and the drive rod 67 moves away from the sludge pit 2 (return operation). .., The respective scrapers 30 ′, 30... Have changed from the scraping attitude to the returning attitude. That is,
When the drive rod 67 starts to slide in the return movement direction from the state shown in FIG. 10, the slide operation drive force first acts on the upper end of the drive link 36 of the drive scraper 30 '. Then, the drive scraper 30 'swings with the other scrapers 30 via the interlocking rod 40 to take a return posture. Until the scrapers 30 ′, 30... Complete the posture changing operation, the frame 20 does not slide and stops at the same position as in FIG.

From the state shown in FIG. 11, a substantially L-shaped second
When the link 66 swings and rotates the drive rod 67 further away from the sludge pit 2 (return operation direction), the scrapers 30 ′, 30... Slide with the frame 20 in the return direction while maintaining the return posture. Then, the state returns to the state shown in FIG. That is, as shown in FIG. 11, when the scrapers 30 ′, 30... Return to the returning posture, the driving scraper 30 ′ cannot be further displaced by the stopper 29 (see FIG. 7). Therefore, after the scrapers 30 ′, 30... Return to the return position, when the driving link 36 of the driving scraper 30 ′ is further provided with a sliding operation driving force in the returning direction, the frame 20 is moved by the sliding operation driving force. Scraper 3
.. Will slide together with 0 ′, 30. At this time, each of the scrapers 30 ′, 30.
1 ′, 31... Are in a returning position away from the bottom of the pond, so that each of the scrapers 30 ′, 30... Passes above the sludge settled on the bottom of the pond, and does not scrape the sludge up or roll up the sludge. .

According to the sludge scraper body 10 configured as described above, each of the scrapers 30 ′, 30...
The driving source 6 is connected by the interlocking rod 40 with the rotating shafts 34...
At first, the posture is changed in conjunction with the reciprocating sliding operation driving force of 0, and the frame 20
In addition, since the sludge can be slid together with the frame 20, the sludge can be reliably swept together with the frame 20, so that the sludge is not scraped back or rolled up.
Therefore, by repeating the scraping operation and the returning operation, the sludge M settled on the bottom of the pond can be efficiently scraped.

Further, a plurality of scrapers 30 ', 30 ...
Is provided, the stroke of the reciprocating sliding operation of each of the scrapers 30 ′, 30... Can be set small when the sludge is swept over the entire bottom of the pond.

Also, the scraper 30 ', 30 ... is set at a position where the tips of the blade bodies 31', 31 ... do not contact the bottom of the pond, so that the scrapers 30 ', 30 ... are scraped. Are not damaged by contact with the bottom of the pond when the sliding operation is performed in the shifting posture, the maintenance work can be reduced, and the life of the device can be extended. be able to. Also, the scrapers 30 ', 3
Since it is not necessary to form the bottom of the pond excessively smooth in order to prevent the damage of 0 ..., the surface finishing step of the pond bottom and the like can be omitted, and the construction cost of the sedimentation basin 1 can be reduced.

Since the frame 20 is supported by guide rollers provided on the side wall of the sedimentation basin 1, rails and the like are attached to the bottom of the pond so as to support the frame 20 so as to be slidable in the sludge sweeping direction. No need. From this point as well, the step of finishing the bottom of the settling basin 1 and the like can be omitted, and thus, the construction cost of the settling basin 1 can be reduced.

Further, a plurality of scrapers 30 ', 30 ...
The weight of the link rod 40 for linking the
Are supported by the guide rollers 25..., The operation drive source 60 only needs to apply the slide operation drive force only to the drive scraper 30 ′ via the drive rod 67, and the weight of the interlocking rod 40 directly acts. Because there is no
The sliding operation driving force of the operation driving source 60 can be efficiently transmitted to the plurality of scrapers 30 including the driving scrapers 30 ′, and the posture changing operation can be performed.

Further, the scrapers 30 are urged by the balance weight 35 toward the scraping posture during the scraping posture and toward the returning posture during the returning posture, respectively, so that the scrapers 30 ', 30' By stabilizing the scraping posture and the returning posture, the sludge can be more securely scraped, and the returning operation can be reliably performed without scraping the sludge.

The scrapers 30 ', 30 ... take a scraping posture during the scraping operation, and take a returning posture during the returning operation, so that the scraper 30', 30 ', 30' is brought into the returning posture without being greatly affected by the sliding operation speed. Can be performed, and the return sliding operation can be performed without scraping or rolling up the sludge. Therefore, the driving source 60 that applies the reciprocating sliding operation driving force to the sludge scraper main body 10 can have a simple configuration in which the driving shaft 62 is rotated at substantially constant speed, and cost reduction can be achieved.

Since the substantially rotating operation of the driving source 60 is converted into a reciprocating sliding operation via the link mechanism, the sliding operation speed before and after the reversing of the sliding operation direction becomes relatively low. ., 30... Perform the posture changing operation immediately after the reversing of the sliding operation direction, so that the impact of the posture changing operation can be suppressed small, and the life of the device can be prolonged.

Further, the drive link 36 of the drive scraper 30 ′ to which the slide operation drive force is transmitted from the drive source 60.
Is configured to have a different length from the interlocking links 32 of the other scrapers 30. Therefore, the resistance of the operation of changing the attitude of all the scrapers 30. The length of the drive link 36 can be set according to the ratio with the initial movement resistance when the main body 10 slides. For this reason,
A series of operations in which each of the scrapers 30,..., 30 ′ is changed in attitude and then slides can be easily and reliably realized. In addition, the resistance of the operation of changing the attitude of all the scrapers 30.
It can be adjusted to some extent by the length of the interlocking links 32. Therefore, by adjusting the ratio between the length of the drive link 36 and the length of the interlocking link 32, the sliding operation can be performed after the posture of each of the scrapers 30,.

Next, the scum scraper 50 provided in the sludge scraper will be described with reference to FIGS.

The scum scraping machine 50 is provided with scum scraping blades 52 along guide rails 53 supported above rails 531.
The scum scraper main body 51 provided with is configured to reciprocate in the longitudinal direction of the sedimentation basin 1. When the scum scraper body 51 slides toward the trough 3 provided near the water surface of the sedimentation basin 1, the scum scraper blades 52 are inserted into the water from the scum scraper body 51. When the scum S floating in the vicinity of the water surface is scraped and the scum scraper 50 slides in the direction away from the trough 3, the scum scraping blade 52 is lifted above the water surface and the scum S is scraped. It is prevented from being returned.

On the other hand, the upper sprocket 68 attached to the drive shaft 62 of the drive source 60 and the guide rail 5
Lower sprocket 69 arranged at the height of 3,53
The lower sprocket 69 has a lower sprocket 69 along the guide rails 53, 53 and a trough upper sprocket 55 located above the trough 3.
The drive chain 54 is bridged to it. The main body 51 of the scum scraper includes guide rails 53, 53.
When the drive shaft 62 rotates, the guide rails 53 are moved in a direction toward the trough 3 or in a return direction away from the trough 3 in accordance with the rotation direction. The crab slides.

In this way, the scum floating near the water surface of the sedimentation basin can be raked and collected, and the driving source that rakes the scum near the water surface can be shared with the driving source that rakes the sludge at the bottom of the pond. Thus, cost reduction as a whole can be achieved. In addition, since the drive shaft of the operation drive source rotates at a substantially constant speed, the scum scraping device can be operated at a substantially constant speed, whereby a reliable scum scraping operation can be realized.

By providing the scum scraper 50 as described above, the scum S floating in the vicinity of the water surface of the sedimentation basin 1 is provided.
And the drive source for scraping the scum S near the water surface can be shared with the drive source for scraping the sludge at the bottom of the pond, thereby reducing the cost as a whole.

Since the drive shaft 62 of the drive source 60 rotates at a substantially constant speed, the scum scraper main body 51 is operated at a substantially constant speed, so that a reliable scum scraping operation can be realized.

The sludge scraper body 10 near the bottom of the pond receives the reciprocating slide driving force from the driving source 60 via the link mechanism, so that the same operation is performed irrespective of the rotation direction of the driving shaft 62. Can be performed,
If the scum scraper main body 51 reaches both ends of the sliding operation range along the guide rails 53, the rotation direction of the drive motor 61 and the drive motor 62 can be reversed regardless of the state of the sludge scraper main body 10. it can. Therefore, the scum S can be efficiently scraped by the scum scraper main body 51 also from this point.

Although the present invention has been described with reference to the embodiment, the sludge scraper according to the present invention is not limited to the above-described embodiment, and may be appropriately configured within the scope of the present invention. May be deformed.

For example, in the above embodiment, the scrapers 30 ′, 30.
Although the tip is configured not to contact the bottom of the pond, an elastic rubber or the like may be attached to the tip to scrape the bottom of the pond during the sliding operation.

Further, in the above embodiment, the configuration in which the scum scraper 50 is provided together with the sludge scraper main body 10 has been described, but the scum scraper 50 may not be necessarily provided.

[0063]

As described above, according to the sludge scraper according to the present invention, when a plurality of scrapers are scraped toward a sludge pit or the like, each of the scrapers is brought into a scraping posture before sliding. By doing so, the sludge can be reliably swept up, but when returning to the direction away from the sludge pit etc., each scraper slides after returning to the return position with its tip separated from the bottom of the pond. Since each of the scrapers passes over the sludge settled at the bottom of the pond, it is possible to prevent the sludge from being scraped back and the sludge from being rolled up in the water. Therefore, sludge can be efficiently scraped by repeating such a scraping operation and a return operation.

Further, since the frame is supported by guide rollers provided on the side wall of the sedimentation basin, rails and the like for supporting and guiding the frame on the pond bottom of the sedimentation basin are not required. By making the pond bottom a mere plane, it is possible to reduce the construction cost.

[Brief description of the drawings]

FIG. 1 is an overall schematic front view of a sludge scraper according to an embodiment of the present invention.

FIG. 2 is an overall side schematic view of the sludge scraper.

FIG. 3 is a detailed view of a support structure on both sides of a frame.

FIG. 4 is a front view showing details of a mounting structure of the scraper.

FIG. 5 is a side sectional view showing details of a mounting structure of the scraper.

FIG. 6 is an explanatory diagram illustrating the operation of a balance weight attached to a scraper.

FIG. 7 is a front view showing the details of the mounting structure of the drive scraper.

FIG. 8 is an operation explanatory view of a sludge scraper body.

FIG. 9 is an operation explanatory view of the sludge scraper body.

FIG. 10 is an operation explanatory view of a sludge scraper body.

FIG. 11 is an operation explanatory view of the sludge scraper body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sedimentation tank 2 Sludge pit 3 Trough 10 Sludge scraper body 20 Frame 25 Guide roller 30 Scraper 30 'Drive scraper 31 Blade body 31' Blade body 40 Interlocking rod 50 Scum scraper 60 Drive source 61 Drive shaft 67 Drive rod

Continuation of the front page (56) References JP-A-7-60010 (JP, A) JP-A-7-80212 (JP, A) JP-A-11-137912 (JP, A) JP-A-2000-79303 (JP, A A) JP-A-2001-190905 (JP, A) JP-A-2000-354705 (JP, A) JP-A-60-144906 (JP, U) JP-A-61-130301 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 21/00-21/34

Claims (6)

(57) [Claims] 1. A frame supported by a plurality of guide rollers provided on a side wall of a sedimentation basin and slidable by the guide rollers in a sludge scraping direction, and a scraping position in which a tip thereof is located near the bottom of the pond. And a plurality of scrapers swingably attached to the frame so as to be able to change the attitude to any of a return attitude in which the tip is away from the pond bottom, and a swing fulcrum position of the plurality of scrapers with respect to the frame. The plurality of scrapers are rotatably connected at different height positions from each other, and are displaced relative to the frame in the scraping direction, thereby interlocking the plurality of scrapers to change the posture and an interlocking rod. The plurality of scrapers at a height position different from the swing fulcrum position of the plurality of scrapers with respect to the frame. An operating drive source for providing a reciprocating sliding operation driving force along the sludge scraping direction to the scraper, wherein the reciprocating sliding operation driving force is applied to the plurality of scrapers by the operation driving source. The scraper according to any one of claims 1 to 3, characterized in that it is configured to change its posture in conjunction with said interlocking rod, and then slide with said frame in said sludge scraping direction. 2. The sludge scraper according to claim 1, wherein the scraping posture is a posture in which a tip of the scraper is located at a height position that does not contact a pond bottom. 3. One of the plurality of scrapers is configured as a drive scraper to which a slide operation driving force is given from the operation drive source, and the other scraper is configured to have a posture of the drive scraper via the interlocking rod. The sludge scraper according to claim 1, wherein the posture is changed in accordance with the change. 4. A device attached to the plurality of scrapers so as to swing with the plurality of scrapers,
When the plurality of scrapers take a scraping posture, in the swinging movement direction to the scraping posture side, and when the plurality of scrapers take a returning posture, in the swinging movement direction to the returning posture side, The sludge scraper according to any one of claims 1 to 3, further comprising a balance weight for urging the plurality of scrapers by their own weight. 5. The operation drive source has a drive shaft that rotates at substantially constant speed, and is configured to convert a rotation operation of the drive shaft into a reciprocating slide operation and transmit the reciprocal slide operation to the plurality of scrapers. The sludge scraper according to any one of claims 1 to 4. 6. A scum scraper for scraping scum floating near a water surface of a sedimentation basin, wherein the scum scraper is configured to be driven by the drive shaft of the operation drive source. The sludge scraper described.