JPH0213049Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sediment scraper installed in a settling basin of a water treatment plant such as a sewage treatment plant, a pump station, or a water treatment plant.

[Conventional technology]

A bucket conveyor-type sand scraper that scrapes up and removes the sediment that accumulates on the bottom of a sand settling pond can be used when the bucket conveyor is left on the bottom of the pond after the raking work is completed. There is a risk that the section of the bucket conveyor will be buried in the sediment piled up on the pond bottom, and the resistance of the accumulated sediment will make it impossible to restart the operation. For example, a pair of drive sprockets for guiding a predetermined section of a bucket conveyor so as to crawl along the pond bottom are provided at the lower end of each swing arm, and the swing arm is raised and lowered by swinging, and the pair of driven sprockets are A take-up device such as a counterweight type or a cylinder type is provided to prevent the bucket conveyor from coming off the sprocket, which loosens as the sprocket rises. There was an anti-siltation type sand scraper that lifted the conveyor up from the bottom of the pond to a predetermined height while preventing the conveyor from loosening.

[Problem that the invention attempts to solve]

However, the above-mentioned conventional siltation prevention type sand-scraping machine requires a take-up device that removes slack from the bucket conveyor in synchronization with the rise of the driven sprocket around which the bucket conveyor is wound. The synchronous operation mechanism was complicated, which caused problems such as complicated maintenance.

The present invention was devised in view of the above points, and aims to provide an anti-siltation type sand raking machine that does not require a take-up device, has a simple structure, and is easy to operate and maintain.

[Means for solving problems]

As a means to solve the above-mentioned problems, the present invention proposes a bucket conveyor that is wound and driven by a driving sprocket provided at the upper part of the sand settling basin, and is wound between driven sprockets provided at the lower ends of a pair of swing arms. The conveyor is arranged in a sand settling basin so that it can be raised and lowered by guiding and swinging both the swing arms, and the section between the two driven sprockets on the path of the chain conveyor is located at the bottom of the pond during the work of scraping up sand accumulated on the pond bottom. In the siltation prevention type sand scraper, which lowers the chain conveyor to a creeping position and raises it to a position where the section of the chain conveyor is not buried in sediment when not in operation, the pair of swing arms are each provided with the driven sprocket when not in operation. The lower ends of the
The position of the swing fulcrum of each swing arm and the length of each swing arm are determined so that when each swing arm swings, each driven sprocket at its lower end is at an angle of approximately 45 degrees with respect to the straight line connecting the two driven sprockets. It is characterized by the position and length of the movement drawing a trajectory close to intersecting straight lines.

[Effect]

With this configuration, when the pair of swing arms are respectively swung in a direction in which their respective lower ends move away from each other, the driven sprockets provided at each lower end of the swing arms form an arc diagonally upward at an angle of about 45 degrees. The bucket conveyor rises from the pond bottom without loosening and is prevented from coming off the sprocket, and rises to a position higher than the water surface of the sand settling basin or to a position where it is not buried in the sand.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the embodiment of the siltation prevention type sand scraper according to the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the present invention, in which a tower 2 surrounded by a rain cover is constructed on a slab 1a covering the upper part of a settling basin 1 in which a plurality of water treatment plants are installed. A motor 4 that drives the bucket conveyor 3 is installed on the tower 2.

In addition, within the tower 2, a slab 1a is laid so that the sand raked from the sand settling basin 1 is transported to the sand collection site together with the sand raked up in another sand settling basin (not shown). A conveyor 5 is disposed above the conveyor 5, and a funnel-shaped discharge chute 6 is provided above the conveyor 5 to receive the sediment scraped up by the bucket conveyor 3 and guide it onto the conveyor 5. A drive shaft 7 is provided above the discharge chute 6 so that the rotation of the drive motor 4 is wound around it and is driven to rotate, and a drive sprocket 8 for the bucket conveyor 3 is attached to the drive shaft 7. It is attached to the shaft.

A pair of swing arms 9 and 10 are installed in the settling basin 1 whose upper part is covered with a slab 1a.
As shown in Fig. 1, each swing arm 9 is attached to two rotating shafts that are supported on the side wall of the settling basin and spaced apart from each other by a predetermined distance, in a symmetrical position with the lower part expanded in a V-shape. , 10 at the longitudinal intermediate portion 9a,
10a, respectively, and cover the range from the lowered working position (indicated by the solid line in Figure 1) to the raised position (indicated by the double-dashed line in Figure 1). It is arranged so that it can swing.

Further, the upper ends of both the swing arms 9 and 10 are supported so as to be swingable, respectively, with the base ends extending upward from the opening 1b of the slab 1a as fulcrums, and the swing arms 9 and 10 are swingably supported. Each piston rod 11 of a hydraulically driven cylinder device 11, 12, such as a fluid operated type or a motor operated type.
The tips of a and 12a are connected. Furthermore, driven sprockets 13 and 14 are rotatably attached to the lower ends of both swing arms 9 and 10, respectively.
4 is attached to each swing arm 9, 10 so that it can expand and contract slightly in the axial direction, and is biased in the expansion direction by a spring (not shown).

On the other hand, the bucket conveyor 3 consists of an endless chain 3a and a large number of buckets 3b attached to the chain 3a at equal intervals. After being wrapped around the drive sprocket 8 and also around the first guide sprocket 15 rotatably provided in the tower 2 to change its direction in a substantially vertical direction, the sand plate is inserted into the settling basin 1 from the opening 1b of the slab 1a. A second shaft is guided into the settling basin 1 and is rotatably provided near the fulcrum 9a of the swing arm 9 in the settling basin 1.
The guide sprocket 16 and the third guide sprocket 17, which is rotatably provided at approximately the same height as the second guide sprocket 16 on the outside (on the right side in FIG. 1) of the fulcrum 10a of the swing arm 10, are successively installed. After wrapping it, it is sequentially wound around the driven sprocket 14 attached to the lower end of one swing arm 10 and the driven sprocket 13 attached to the lower end of the other swing arm 9, and the outer side of the second guide sprocket 16 is wrapped. (on the left side in Fig. 1) and is guided by winding it around the fourth guide sprocket 18, which is rotatably provided at approximately the same height, and then extending upwardly from the opening 1b of the slab 1a, and then again The bucket conveyor 3 is arranged in an annular manner leading to the drive sprocket 8.
The section extending between the driven sprockets 13 and 14 is always arranged substantially horizontally.

Furthermore, the pair of swing arms 9 and 10 are
The piston rods 11a, 12 are operated by operating both the cylinder devices 11, 12 using fluid pressure or the like.
By extending or shortening a, the lower ends of each swing arm 9, 10 are driven to swing in a direction away from each other or in a direction toward each other, from the lowered position, which is the working position, to the raised position.
Alternatively, both swing arms 9 and 10 move from the raised position, which is the non-working position, to the lowered position.
The driven sprockets 13 and 14 attached to the lower ends of the sprockets 13 and 14 are always close to the straight line A or the straight line B, which intersects the straight line connecting the two sprockets 13 and 14 at an angle θ of about 45 degrees, respectively, to the fulcrum 9a. Or, so as to move by drawing arc-shaped trajectories ML and ML centered on the fulcrum 10a, respectively,
Each fulcrum 9a, 1 of both swing arms 9, 10
The position of 0a and the length from each fulcrum 9a, 10a to the lower end driven sprocket 13, 14 are respectively set.

Next, an explanation will be given of the operation of the anti-siltation type sand scraper of this embodiment configured as described above.

In order to prevent the section stretched between the driven sprockets 13 and 14 of the pair of swing arms 9 and 10 from being buried, the section of the bucket conveyor 3 is raised to a higher position than the water surface of the sand settling basin 1 during non-operation. To change from the normal position to the working position where the section of the bucket conveyor 3 crawls on the bottom of the pond, both swing arms 9 and 10 are retracted in the direction in which the piston rods 11a and 12a of the cylinder devices 11 and 12 are shortened. When both the driven sprockets 13 and 14 are oscillated in the direction toward each other,
The driven sprocket 13 attached to the lower end of one swing arm 9 follows an arcuate trajectory ML close to the straight line A, and the driven sprocket 14 attached to the lower end of the other swing arm 10 follows a circular trajectory ML close to the straight line B. Both swing arms 9 and 10 move diagonally downward while drawing arc-shaped trajectories ML.
are respectively lowered positions, that is, working positions.

When the swing arms 9 and 10 move from the non-working position to the working position, the driven sprockets 13 and 14 move along arc-shaped trajectories, respectively.
The distance between the driven sprocket 13 and the fourth guide sprocket 18 and the distance between the driven sprocket 14 and the third guide decrease as the distance between the driven sprockets 13 and 14 decreases as the sprockets move by drawing ML and ML. The distance between the sprockets 17 is automatically increased to prevent the bucket conveyor 3 from becoming slack, and the two driven sprockets 1
The bucket conveyor 3 wrapped around the conveyor belts 3 and 14 is prevented from coming off from each sprocket.

Further, the two driven sprockets 13, 14, which move by drawing arcuate trajectories ML, ML by the swinging of the two swing arms 9, 10, move in the middle of each of the trajectories ML. The driven sprockets 13 and 14 are located at the lower ends of the swing arms 9 and 10, respectively, and extend and contract slightly in the axial direction. Since the swing arms 9 and 10 are installed so that they can swing smoothly, they are always kept in a tensioned state due to the predetermined elastic force, and the bucket conveyor 3 is loosened and each Prevent each from coming off the sprocket.

At the working position where both the swing arms 9 and 10 are moved to the lowered position, the motor 4
When the drive sprocket 8 is driven to rotate, the bucket conveyor 3 moves clockwise, and both driven sprockets 1 of the bucket conveyor 3
The section stretched between 3 and 14 is approximately horizontal with sand settling pond 1
A large number of buckets 3b of the bucket conveyor 3 scrape off the sediment accumulated on the pond bottom, and the sand is conveyed upward from the driven sprocket 13.
After passing through the position where it is guided by the fourth guide sprocket 18 and wrapped around the drive sprocket 8,
Each bucket 3b is overturned, and the scraped sand is dropped into the discharge chute 6. After dropping the sand, each bucket 3b has a first guide sprocket 15,
It is sequentially guided by the second guide sprocket 16 and the second guide sprocket 17 and passes through the section crawling on the pond bottom again to scrape off the sediment.

Further, the sand thrown into the discharge chute 6 is conveyed to the sand collection site by a conveyor 5 installed below the discharge chute 6 together with the sand raked up from other sand settling ponds installed in parallel.

After the sand raking work is completed, a bucket conveyor is used to collect the sand that accumulates on the pond bottom during non-work periods.
In order to prevent the section crawling on the bottom of the pond from being buried,
Both swing arms 9 and 10 are connected to the cylinder device 1.
1 and 12 to raise the section of the bucket conveyor 3 to a non-working position higher than the water surface of the sand settling basin 1.

At this time, as both driven sprockets 13 and 14 move in directions away from each other while drawing circular arc-shaped trajectories ML and ML, the distance between driven sprockets 13 and 14 becomes longer. The distance between the fourth guide sprocket 18 and the distance between the driven sprocket 14 and the third guide sprocket 17 are automatically shortened, and each of the driven sprockets 13 and 14 is biased, so that the bucket conveyor 3 will not loosen and will not come off from each sprocket.

Further, FIG. 2 shows a second embodiment of the present invention, in which a swing arm is provided at the upper end of the arm instead of the swing arm that is provided with a swing fulcrum in the middle of the arm adopted in the first embodiment. A swing arm is adopted, and the same components as in the first embodiment are designated by the same reference numerals and detailed explanation thereof will be omitted.

Inside the settling basin 1 whose upper part is covered with a slab 1a, a pair of swing arms 21, 21 each having a driven sprocket 20, 20 attached to its lower end are installed.
They are supported so as to be swingable about their respective upper ends 21a as fulcrums, and are arranged symmetrically in a V-shape with their lower ends widened.

Moreover, this pair of swing arms 21, 21
is approximately the center of each swing arm 21 in the length direction,
Piston rods 22 of cylinder devices 22, 22 whose base ends are swingably suspended from the lower surface of the slab 1a.
a, 22a, respectively, and is moved to a lowered position (position shown by a solid line in FIG. 2) which is a working position by operating the cylinder devices 22, 22.
It is driven to swing from the position to the raised position (the position indicated by the two-dot chain line in FIG. 2) which is the non-working position.

Further, as the swing arms 21, 21 swing, the driven sprockets 20, 2 attached to the lower ends of the swing arms 21, 21, respectively.
0 is a straight line A that intersects the straight line connecting both driven sprockets 20, 20 with an angle θ of approximately 45°.
Alternatively, each of the swing arms 2 may be moved so as to draw an arcuate trajectory ML centered on each of the fulcrums 21a while always being close to the straight line B.
The position of the fulcrum 21a of the first embodiment and the length from the fulcrum 21a to the lower end of each driven sprocket 20 are set respectively. Each swing arm 2 operates in the same manner as when the swing arm 2 is not working.
1 is swung, respectively, to raise the section of the bucket conveyor 3 stretched between the two driven sprockets 20, 20 to a position higher than the water surface of the sand settling basin 1, thereby preventing siltation. .

[Effect of idea]

As explained above, the present invention is provided with a pair of swing arms that are swingable, each having a driven sprocket attached to the lower end thereof for winding and guiding a bucket conveyor. In addition to swinging in directions away from each other, the position of the swing fulcrum of each swing arm and the length of each swing arm are controlled so that when each swing arm swings, each driven sprocket at its lower end The position and length of the movement are such that the position and length of the bucket draw a trajectory close to a straight line that intersects at approximately 45 degrees with the straight line connecting between Since the conveyor is prevented from slackening, the take-up device required in conventional siltation prevention type sand raking machines is not required, and the siltation prevention type silt raking machine has a simple structure and is easy to operate and maintain. It can be used as a machine.

[Brief explanation of drawings]

Each of the figures shows an embodiment of the present invention. Fig. 1 is a cross-sectional front view of a sand settling basin equipped with a siltation prevention sand scraper according to the first embodiment of the present invention, and Fig. 2 is a cross-sectional front view of a sand settling basin equipped with a sedimentation prevention sand scraper according to the first embodiment of the present invention. FIG. 7 is a sectional front view of a sand settling basin provided with a sinking prevention type sand settling and scraping machine according to a second embodiment. 1...Sand basin, 3...Bucket conveyor, 8...
... Drive sprocket, 9, 10... Swing arm, 9a, 10a... Fulcrum, 11, 12... Cylinder device, 11a, 12a... Piston rod,
13, 14...driven sprocket, 15, 16,
17, 18... Guide sprocket, 20... Driven sprocket, 21... Swing arm, 21
a...Fully point, 22...Cylinder device, A, B...
Straight lines that intersect at approximately 45 degrees, ML...The locus drawn by the driven sprocket.

Claims (1)

[Scope of utility model registration request] A bucket conveyor, which is wound and driven by a drive sprocket provided at the top of the settling basin, is guided by being wound between driven sprockets provided at the lower ends of a pair of swing arms, and is raised and lowered by swinging both swing arms. It is possible to dispose it in a sand settling pond, and when working to scrape up sand accumulated on the pond bottom, the section of the path of the chain conveyor between the two driven sprockets is lowered to a position where it crawls on the pond bottom, and when not working, the chain conveyor's In a siltation prevention type sand scraper that raises a section to a position where it will not be buried in sediment, the pair of swing arms are oscillated in a direction in which the lower ends of each of the swing arms provided with the driven sprocket are separated from each other during non-operation, and The position of the swing fulcrum of each swing arm and the length of each swing arm are determined so that when each swing arm swings, each driven sprocket at its lower end is at an angle of approximately 45 degrees with respect to the straight line connecting the two driven sprockets. A siltation prevention type sand raking machine characterized by having a position and length that moves along a trajectory close to intersecting straight lines.