JPH11179109A - Sludge-scraping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge scrapping device capable of prolonging the life of a shoe. SOLUTION: A pair of rails 20 are arranged in a truncated chevron shape, and thereby the slidingly contacting faces of shoes 34, which slidingly come into contact with the rails 20, are gradually moved as scraping plates 16 advances in the direction shown in an arrow on a figure. Thereby, uneven abrasion of the shoes 34 is prevented, and the life of the shoes 34 can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge scraping apparatus, and more particularly to a sludge scraper which runs along a pair of rails laid on the bottom of a settling pond to collect sludge settled on the bottom of the pond. The present invention relates to a sludge scraping device that scrapes into a mud pit.

[0002]

2. Description of the Related Art Conventionally, this kind of sludge scraping apparatus has a plurality of scraping plates. By moving this scraping plate along a pair of rails laid on the bottom of the pond, the scraping plate scrapes the sludge settled on the bottom of the pond. A pair of cast iron or abrasion-resistant resin shoes are fixed to the lower end of each scraping plate, and slidably contact the pair of rails.

In a conventional sludge scraper, the pair of rails are arranged in parallel with each other.

[0004]

However, in a conventional sludge scraper in which a pair of rails are arranged in parallel, the portion of the shoe that slides on the rail is always at the same position, so that the shoe is unevenly worn and the shoe is unevenly worn. Has a shortcoming that the life of the device is short. When replacing the shoes, it is necessary to stop the sewage treatment, drain the water from the sedimentation basin, remove the worn shoes from the scraper plate, and install new shoes, which is very troublesome.

[0005] The present invention has been made in view of such circumstances, and has as its object to provide a sludge scraping device that can extend the life of a shoe.

[0006]

According to the present invention, in order to achieve the above object, a scraping plate is provided on a pair of rails laid on a pond bottom through a pair of shoes provided on the scraping plate. The sludge scraping device that slidably mounts the sludge on the bottom of the pond by running the scraper along the pair of rails. The pair of rails are arranged in a C-shape, and flanges are provided on both sides of the shoe to prevent the shoe from falling off the rail.

According to the present invention, in order to achieve the above object, a scraping plate is slidable on a pair of rails laid on a pond bottom via a pair of shoes provided on the scraping plate. In the sludge scraping device that scrapes sludge settled on the bottom of the pond with the scraping plate by moving the scraping plate along the pair of rails, the pair of rails It is curved and arranged symmetrically with respect to a center line between a pair of rails, and both sides of the shoe are provided with flanges for preventing the shoe from falling off from the rail. Features.

According to the first aspect of the present invention, since the pair of rails are arranged in a C-shape, the sliding surface of the shoe that slides on the rail gradually moves as the scraping plate advances. For this reason, uneven wear of the shoe can be prevented, and the life of the shoe can be extended. Further, by providing the flanges on both sides of the shoe, it is possible to prevent the shoe from falling off the rail.

According to the second aspect of the present invention, the pair of rails are arranged in a C-shape that widens in the direction of travel of the scraping plate, so that the sliding contact surface that slides on the rail of the shoe is scratched. It gradually moves from the inside of the shoe to the outside as the board is advanced. For this reason, when the flange of the shoe comes into contact with the rail, it is possible to prevent the scraping plate from being locked and stopped.

According to the third aspect of the present invention, the pair of shoes of the scraping plate that has reached the end of the rail are slidably contacted with the pair of return guide rails arranged in a C-shape. It is guided by a pair of return-side guide rails and returned to the starting end of the rail. Since the return-side guide rails are similarly arranged in a C-shape, uneven wear of the shoes can be prevented, and the life of the shoes can be extended.

According to the fourth aspect of the present invention, since the return side guide rail is formed in a C-shape that widens in the direction of travel of the scraping plate, the scraping plate is locked and stopped. Can be prevented. According to the invention of claim 5, the distance D between the flanges provided on the shoe is set to 2C <D ≦ 3C, where C is the width of the sliding surface of the rail. When 2C ≧ D, the shoes are unevenly worn, and when 3C <D, the shoes are unnecessarily increased in size and the cost of shoes made of expensive materials is increased. Therefore, by setting 2C <D ≦ 3C, the life of the shoe can be extended sufficiently and the cost of the shoe can be minimized.

According to the sixth aspect of the present invention, the distance D between the flanges provided on the shoe is A, the distance between the starting ends of the pair of rails arranged in a V shape is A, and the distance between the ends is A. Assuming B, 2 × | AB | / 2 <D ≦ 3 × | AB
| / 2 is set. When 2 × | AB | / 2 ≧ D, the shoe is unevenly worn, and when 3 × | AB | <D, the shoe is unnecessarily enlarged, and the cost of the shoe made of an expensive material is increased. Increase. Therefore, 2 × | A−
By setting B | / 2 <D ≦ 3 × | A−B | / 2,
The life of the shoe can be sufficiently extended, and the cost of the shoe can be minimized.

According to the seventh aspect of the present invention, the pair of rails are formed to be curved and symmetrically arranged with respect to the center line between the pair of rails, so that the sliding contact surfaces that slide against the shoes of the rails. Moves gradually as the scraping plate advances. For this reason, uneven wear of the shoe can be prevented, and the life of the shoe can be extended. Further, by providing the flanges on both sides of the shoe, it is possible to prevent the shoe from falling off the rail.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sludge scraping apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a first embodiment of a sludge scraping device. As shown in FIG.
This is a device for scraping sludge 18 settled on the bottom of the sedimentation basin 12 for sewage treatment.
0.

FIG. 2 shows a scraping plate 16 of the sludge scraping device 10.
FIG. As shown in FIG. 1 and FIG.
Rakes the sludge 18 settled on the bottom of the pond, and is attached to the pair of chains 14. This chain 14
Is formed endlessly and stretched over a pair of sprockets 22 and 22 provided near the pond bottom and a pair of sprockets 24 and 24 provided near the water surface.
One sprocket 24 of the pair of sprockets 24, 24 is connected to a drive unit 28 on the water via a chain 26. The drive unit 28 drives the chain 14 to rotate in a direction indicated by an arrow in FIG. Each scraping plate 16 is circulated.

A pair of rails 20 and 20 are laid on the bottom of the pond, and the scraping plate 16 travels along the rail 20 in the direction of the arrow in the figure when passing between the pair of sprockets 22 and 22 to form a pond. The sludge 18 settled to the bottom is swept up. A sludge collecting pit 30 is formed at the left end of the pond bottom in the figure, and the sludge scraped to the end of the rail 20 is scraped out by the sludge collecting pit 30.

A pair of cast iron or wear-resistant resin shoes 34, 34 are fastened to each scraping plate 16 by bolts (not shown). Each of the shoes 34 slides on the upper end surface of the rail 20. Flanges 36, 36 protruding from the bottom surface of the scraping plate 16 are formed on both side edges of each shoe 34 to prevent the shoes 34 from dropping off the rail 20. A pair of rails (return side guide rails) 32, 32 are provided between the pair of sprockets 24, 24, and the scraping plate 16 passing between the sprockets 24 runs along the rail 32, and the slack of the chain 14 is reduced. Is prevented. Rake plate 16
A pair of shoes 38, 38 are attached to the
6 travels along the rail 32,
In sliding contact with the top surface of Flanges 36, 36 protruding from the bottom surface of the scraping plate 16 are formed on both side edges of each shoe 38 to prevent the rail 20 from dropping off the shoe 34.

As shown in FIG. 3, the pair of rails 20
The rake plates 16 are arranged in a C-shape which is symmetrical with respect to a center line indicated by a dotted line in the figure and widens toward the advancing direction indicated by an arrow in the figure. Similarly to the rail 20, the pair of rails 32 are arranged in a C-shape that widens in the traveling direction indicated by the arrow in the drawing.

Next, the operation of the sludge scraper constructed as described above will be described. The chain 14 is rotationally driven by a driving device 28 in the direction of the arrow in the figure, and each scraping plate 16 circulates and runs according to the rotation of the chain 14. Sprocket 2
The scraping plate 16 guided between 2 and 22 scrapes the sludge 18 settled on the bottom of the pond by traveling along the rail 20 in the direction of the arrow in the figure. At this time, the shoe 34 comes into sliding contact with the upper end surface of the rail 20, and as shown in FIG.
As the rail 20 is arranged in a U-shape, the sliding contact surface that slides on the rail 20 gradually moves from the inside to the outside of the shoe 34 in the direction of the arrow in the figure as the scraping plate 16 advances. Therefore, uneven wear of the shoe 34 can be prevented, and the life of the shoe 34 can be extended.

The scraping plate 16 reaching the end of the rail 20 is
The scraped sludge 18 is scraped out to the mud collecting pit 30. The scraping plate 16 from which the sludge 18 has been scraped is guided between the sprockets 24 as the chain 14 rotates, and travels along the rail 32 in the direction of the arrow in the figure. At this time, the shoe 38 comes into sliding contact with the upper end surface of the rail 32,
As the rail 32 is arranged in a U-shape, the sliding contact surface that slides gradually moves from the inside to the outside of the shoe 38 as the scraping plate 16 advances. Therefore, uneven wear of the shoe 38 can be prevented, and the life of the shoe 34 can be extended.

The scraping plate 16 having passed between the sprockets 24 runs again along the rail 20 and continuously scrapes the sludge 18 settled at the bottom of the pond. In this way, by circulating the scraping plate 16, the sludge 18 is continuously fed.
Rake. As shown in FIG. 3, when the outer flange 36 of the lower shoe 34 of the scraper 16 contacts the lower rail 20 when the scraper 16 travels along the rail 20, As indicated by the dashed line, the scraper 16 rotates counterclockwise about the contact point. When the outer flange 36 of the upper shoe 34 of the scraping plate 16 comes into contact with the upper rail 20 by this rotation, the scraping plate 16 rotates clockwise about the contact point. Thus, the pair of rails 20
Are arranged wider in the direction of travel, so that the scraping plate 16 advances while repeating rotation. Conversely, if the pair of rails 20 is arranged narrower in the traveling direction, when the flange 36 contacts the rail 20 and the scraping plate 16 rotates, the flanges 36 at both ends sandwich the rail 20, As a result, the scraping plate 16 is locked and stopped.

The flanges 36, 3 of the shoe 34 shown in FIG.
The interval D between the six is set as follows. Assuming that the interval between the start ends of the rails 20 and 20 shown in FIG. 3 is A and the interval between the ends is B, the above D is set as in the equation (1).

[0023]

2 × (B─A) / 2 <D ≦ 3 × (B─A) / 2 (1) (B─A) / 2 is the moving distance of the rail 20 shown in FIG. When 2 × | AB | / 2 ≧ D, the shoe 34 is unevenly worn, and when 3 × | AB | <D, the shoe 34 is unnecessarily enlarged and made of an expensive material. The cost of the shoe 34 is increased.

When the width of the upper end surface of the rail 20 is C, D is set as in the following equation (2).

[0025]

2C <D ≦ 3C (2) When 2C ≧ D, the shoe 34 wears unevenly and 3C <D
In this case, the size of the shoe 34 is unnecessarily increased, and the cost of the shoe 34 made of an expensive material increases. By setting the interval D between the flanges 36, 36 as described above, the life of the shoe 34 can be sufficiently extended, and the cost of the shoe 34 can be minimized.

FIG. 5 is a rail layout diagram of the sludge scraping device of the second embodiment. The pair of rails 40 are formed in a curved shape and are symmetrically arranged with respect to a center line indicated by a dotted line. As a result, the sliding surface of the shoe 34 that slides on the rail 40 sequentially moves from the inside to the outside, from the outside to the inside, and from the inside to the outside of the shoe 34 as the scraping plate 16 advances. By moving the sliding contact surface in this way, uneven wear of the shoe 34 can be prevented, and the life of the shoe 34 can be extended.

[0027]

As described above, according to the sludge scraping device of the present invention, since the pair of rails are arranged in a C shape, uneven wear of the shoe can be prevented, and Life can be extended. Further, by providing the flanges on both sides of the shoe, it is possible to prevent the shoe from falling off the rail.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a sludge scraping device according to a first embodiment.

FIG. 2 is a front view of a scraping plate of the sludge scraping device of FIG. 1;

FIG. 3 is a rail layout diagram of the sludge scraping device of FIG. 1;

FIG. 4 is an explanatory view for explaining a change in a sliding position of a rail on a shoe of the sludge scraping device of FIG. 1;

FIG. 5 is a rail layout diagram of the sludge scraping device according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Sludge scraping device 12 ... Sedimentation pond 14 ... Chain 16 ... Scrape plate 18 ... Sludge 20, 40 ... Rail 32 ... Rail 34, 38 ... Shoe 36, 40 ... Flange

Claims (7)

[Claims] 1. A scraping plate is slidably mounted on a pair of rails laid at the bottom of a pond via a pair of shoes provided on the scraping plate. In the sludge scraping device that runs along the rails of the above to scrape the sludge settled on the bottom of the pond with the scraping plate, the pair of rails are arranged in a C-shape, and both sides of the shoe A sludge scraping device, wherein a flange for preventing the shoe from falling off from the rail is provided in the portion. 2. The sludge scraping apparatus according to claim 1, wherein said pair of rails are arranged in a C-shape that widens in a direction of movement of said scraping plate. 3. A return-side guide rail, which is slidably brought into contact with a pair of shoes of the scraping plate that has reached the end of the rail and returns the scraping plate to the starting end of the rail, is disposed. The sludge scraping device according to claim 1, wherein the rails are arranged in a C shape. 4. The sludge scraping device according to claim 3, wherein the return side guide rail is formed in a C-shape that widens in a direction of movement of the scraping plate. 5. A distance D between the flanges provided on the shoe is 2 when a width of a sliding surface of the rail is C.
2. The sludge scraping apparatus according to claim 1, wherein C <D ≦ 3C. 6. The distance D between the flanges provided on the shoe is 2 × |, where A is the distance between the start ends of the pair of rails arranged in a C shape and B is the distance between the ends. A-
2. The sludge scraping apparatus according to claim 1, wherein B | / 2 <D ≦ 3 × | A−B | / 2. 7. A scraping plate is slidably mounted on a pair of rails laid at the bottom of a pond via a pair of shoes provided on the scraping plate, and the scraping plate is attached to the pair of shoes. In the sludge scraping device for running along the rails of the sludge to scrape the sludge settled on the bottom of the pond with the scraping plate, the pair of rails are formed to be curved and the center between the pair of rails is formed. A sludge scraper, which is disposed symmetrically with respect to a line, and provided on both sides of the shoe with flanges for preventing the shoe from falling off the rail.