JPS6356803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a sludge scraper mainly used in small-scale sewage treatment facilities, and more particularly to a sludge scraper in which a rake is suspended by a chain.

BACKGROUND OF THE INVENTION In recent years, sewerage systems have become widespread throughout Japan, including not only large cities but also regional cities, rural areas, fishing villages, etc., and along with this, there has been a demand for expansion of small-scale sewage treatment facilities.

Conventionally, in such small-scale sewage treatment, the oxidation date method has been adopted in order to reduce costs and save labor, and a sludge scraper as shown in FIG. 6 has been developed.

In this conventional scraper, a rake 2 placed at the bottom of a cylindrical water tank 1 circulates around a central shaft 3, thereby scraping the sludge settled at the bottom of the tank 1 into the center. This sludge was removed from the discharge port 4.

However, in this conventional raking machine, the rake 2 was fixed to the central shaft 3 with a shaped steel 5, etc., so when inspecting the submerged part of this raking machine, it was necessary to empty the water tank 1 once. Therefore, another series of water tanks for inspection is required, and the resulting problems of securing land and increasing costs have become important problems that must be solved, especially in small-scale sewage treatment.

Purpose This invention was made in order to eliminate the drawbacks of the conventional sludge scraper as described above, and it is capable of inspecting the rake without emptying the water tank.
It is an object of the present invention to provide a sludge scraper that can be repaired and has a simple structure, which can significantly reduce costs by eliminating the need to provide an additional water tank or the like.

Configuration This invention includes a cylindrical water tank, a shaft installed at the center of the water tank, an arm that is attached horizontally with one end pivotally supported by the shaft, and that is rotated by a drive device. and a rake suspended from the arm by a wire rod, the rake being concave in the circumferential direction, and suspended by the wire rod so that the outer end of the rake is pulled toward the inner circumferential wall of the aquarium. A roller is attached to the outer end of the rake to guide the rake along the inner peripheral surface of the aquarium, and the inner end of the rake is curved so as to wrap around the shaft. It is characterized by:

The present invention will be explained in more detail below based on embodiments shown in the drawings.

In FIGS. 1 and 2, a center pole 12 is erected in a cylindrical water tank 11, and an arm 13 connects one end of the center pole 12 to the center pole 12.
It is mounted horizontally and is pivoted on the upper end of the. A motor 14 is provided at the other end of this arm 13.
A drive roller 15 is attached to the drive roller 15, and as the drive roller 15 rotates and travels, the arm 13 revolves around the center pole 12.

Further, the arm 12 includes chains 17a to 17.
so that the rake 18 is oriented horizontally by c.
As the arm 13 revolves around the center pole 12, the rake 18
along the bottom of the aquarium 11, the center pole 12
It is designed to orbit around the As can be seen from FIG. 1, the chain 17a is stretched so that its upper end is inclined outward with respect to the vertical direction, and urges the rake 18 toward the inner circumferential wall of the water tank 11. ing.

Further, a roller 19 is attached to the outer end of the rake 18 so as to be rotatable in a horizontal plane, and the rake 18 is pressed against the inner circumferential wall of the water tank 11 by being urged by the chain 17a.
When the rake 18 revolves around the center pole 12 as the arm 13 rotates, the tip of the rake 18 is guided along the inner circumferential wall of the water tank 11.

A rubber plate 18a is attached to the lower edge of the rake 18 so that it slides on the bottom surface of the water tank 11 when the rake 18 revolves along the bottom surface of the water tank 11.

Furthermore, as can be seen from Figure 2, the rake 18
is curved in a concave shape with respect to the circumferential direction (direction of arrow A in FIG. 2), and the inner end 1
8b is extended and further curved so as to wrap around the center pole 12.

In the sludge scraper, as the drive roller 15 is rotationally driven by the motor 14 and moves along the rail 16, the arm 13 revolves around the center pole 12.
As the rake 18 rotates, the rake 18 rotates along the bottom surface of the water tank 11, thereby scraping the settled sludge to the center.

When inspecting or repairing the rake 18, pull up the chains 17a to 17c and remove the rake 18.
This can be done by taking out the water from the water tank 11. By making the rake 18 a hanging type using a chain instead of a fixed type as in the conventional case, the rake 18 can be inspected and repaired without emptying the water tank 11.

Furthermore, since the inner end 18b of the rake 18 is curved so as to wrap around the center pole 12, the sludge that has settled at the bottom of the water tank 11 can be absorbed into the rake 1.
As shown in FIG. 3, the force pushing the inner end 18b of the rake acts radially around the center pole 12 and is balanced in each different direction (arrow B), so that the inner end 18b of the rake does not come off from the center pole 12.

Furthermore, since the rake 18 is urged by the chain 17a in the direction of pressing its outer end against the inner circumferential wall of the water tank 11 (arrow C in FIG. 3), it is pushed out by the settled sludge and The end is aquarium 1
There is no risk of it coming off the inner peripheral wall of No. 1.

In other words, if the inner end of the rake does not have the shape described above or if the rake is simply suspended, the viscous resistance of the precipitated sludge α will Therefore, the inner end of the rake 18' is pushed away from the center pole 12, and the outer end of the rake is pushed away from the inner peripheral wall of the water tank 11, making the rake 18' unstable and leaving sludge behind. With the above configuration, the rake is stable and, like a fixed rake, it is possible to scrape up the sludge sufficiently as planned.

Further, since a roller 19 is attached to the outer end of the rake 18, the friction between the outer end of the rake 18 and the inner peripheral wall of the water tank 11 is reduced, and the rake 18 can rotate smoothly. It is something.

In addition, the rake, as shown in Figures 4 and 5,
Comparing the cases of using a curved one and a straight one, in the case of a straight rake of 18",
Even with the center raking method, if a load is applied to the center, the rake 18'' will have too much relief and will float, so it was observed that the curved rake 18' shown in FIG. 4 is more suitable. Even when the curved rake 18' was used, escape of the rake due to the accumulation of sludge in the central part was observed, and accumulation of sludge was also observed in the peripheral area due to escape of the rake. As shown in Figure 3, the inner end of the rake is extended and curved to wrap around the center pole, and the chain that suspends the rake is used to push the rake against the inner peripheral wall of the aquarium. It has been confirmed that applying force is effective.

Note that the method of attaching the chain is not limited to the one shown in the drawings, and any method of attaching the chain may be used as long as it presses the rake against the inner circumferential wall of the aquarium. Also, chains 17a to 17
A wire may be used instead of c.

Further, in the above embodiment, as shown in FIG. 1, when a picket fence consisting of chains 22a to 22c is attached to the arm 21 of the center pole 12, the picket fence promotes the settling of sludge, and the rake 18 removes the sludge. This makes it possible to further enhance the raking effect.

Effects As described above, this invention suspends the rake by a wire rod, so that when repairing or inspecting the rake, the wire rod is pulled up and the rake is taken out of the water tank. Since there is no need to empty the water tank, the rake can be easily repaired and inspected.Furthermore, there is no need to set up another series of water tanks for inspection, especially since an aeration tank is formed on the outside. When using a conventional sludge scraper in a small-scale sewage treatment facility with a double concentric circular structure that has only one sedimentation tank inside, it is necessary to install not only a sedimentation tank but also another series of aeration tanks. However, the present invention eliminates the need for these, and thus solves the problems of securing land and increasing costs, which is preferable. The rake is suspended so that its outer end is pulled toward the inner circumferential wall of the aquarium, and a roller is attached to this outer end to guide the rake by contacting the inner circumferential surface of the aquarium. Since the inner end is curved to wrap around the center pole, there is no risk of the rake escaping due to sludge accumulated on the entire bottom of the tank, and sludge can be scraped up stably. In addition, the surrounding motion of the rake can be carried out smoothly and stably.Furthermore, the picket fence made of multiple wire rods promotes the settling of sludge and improves the scraping effect of the rake. Each of them has excellent effects, such as being able to.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
FIG. 2 is a plan view of the same embodiment, FIG. 3 is an explanatory diagram showing the shape of the rake in the same embodiment, FIGS. 4 and 5 are explanatory diagrams explaining the operating state of the rake, and FIG. The figure is a schematic side sectional view showing a conventional sludge scraper. 11...Aquarium, 12...Center pole, 13
... Arm, 14 ... Motor, 15 ... Drive roller, 16 ... Rail, 17a to 17c ... Chain, 18 ... Rake, 19 ... Roller, 21 ...
Arm, 22a to 22c... Chain, 23...
Sludge extraction pit, 24...Sludge extraction pipe.

Claims (1)

[Scope of Claims] 1. A cylindrical water tank 11, a shaft 12 installed at the center of the water tank 11, one end of which is pivotally supported by the shaft 12, which is mounted horizontally, and is rotated by a drive device. and a rake 18 suspended from the arm 13 by a wire 17. A roll 19 is attached to the outer end of the wire rod 17 to guide the rake 18 along the inner peripheral surface of the water tank 11. A sludge scraper characterized in that an inner end is curved so as to wrap around a shaft 12. 2. The sludge scraper according to claim 1, wherein a picket fence 22 made of a plurality of wire rods 17 of an arm 21 is suspended.