JP3116121B2 - Rotary driven scum remover in circular sedimentation basin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a rotary-driven scum removal device for a circular sedimentation basin.

[Prior art]

In a circular sedimentation basin, the front wall is lower than the water surface and the back wall protrudes higher than the water surface, and a trough formed in a gutter shape orbits around the water surface, so that the scum floating on the water surface is swept together with the water on the water surface and the center rotates. Some are stored in a tank and the scum water in the rotating tank is removed outside the pond. In such a system, the orbiting scraper and the fixed trough are combined, so that the structure is simplified.

[Problems to be solved by the invention]

However, since the front wall of the orbiting trough is fixed at a fixed height relative to the water surface, it is not possible to follow the water level fluctuation that is common in this kind of circular sedimentation basin. If the water level cannot be increased or the water level rises high, instead of scum, the water will be swallowed more, and the capacity of the next treatment device after the sedimentation basin increases, which is not preferable. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a constant and low ratio of scum and water at all times even when the water level fluctuates, so that the water can be smoothly attracted. An object of the present invention is to provide a rotary scum removing device for a circular sedimentation basin.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a rotary shaft provided in the center of a pond in a vertical axis, a swaging device provided around the rotary shaft to rotate on the pond bottom, and A fixed cylinder having an open top and a bottom provided on the outer periphery of the upper portion of the rotary shaft, an outflow pipe having one end communicating with the fixed cylinder and the other end communicating with the outside of the pond via an open / close valve, and a water surface. A rotating cylinder that is provided rotatably around the rotation axis so as to be above and below and is connected concentrically and relatively rotatably to the upper side of the fixed cylinder, and a rotation direction front wall is below the water surface. There is a gutter-shaped elongate member whose back wall protrudes above the water surface, one end of which is inserted into the rotating cylinder in a communicating manner, and the other end of which is communicated with the rotating cylinder. Rollable on the surrounding wall of the pond via a roller, and freely rotatable with the rotary cylinder A rotary driven scum removal device in a circular sedimentation basin provided with a trough that has been provided and means for appropriately opening and closing the open / close valve, wherein the trough has a long front side in the circumferential direction and has a long shape in its longitudinal direction. A weir provided with a plurality of recesses is provided so as to be able to move up and down along the front wall, and the weir is guided by a guide such that the upper end side other than the recess is always kept at a level lower than the water surface by a certain amount. A vertically guided float is provided.

【Example】

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 to 3 show an embodiment of the present invention. That is, 1 is a circular sedimentation basin, and the sedimentation basin 1 has a peripheral wall 2 and a conical bottom wall 3. Reference numeral 4 denotes a mold steel corridor fixed across the upper center of the sedimentation basin 1, and a motor 5 equipped with a speed reducer is fixed in the longitudinal center of the corridor 4 in the longitudinal direction. A rotating shaft 6 is provided so as to extend downward from the motor 5. Rotary shaft 6
A scraping device 7 is provided on the outer periphery of the lower part of. A scraping plate 8 is attached to a lower portion of the device 7. A perforated cylinder 10 is rotatably provided between the upper and lower portions of the rotary shaft 6 by welding, and a number of holes 11 are formed in the outer periphery of the perforated cylinder 10. An inflow pipe 12 is passed through the peripheral wall 2 of the pond 1 toward the inside of the pond, and an end of the inflow pipe 12 faces the inside of the porous tube 10. Sewage flows in from the inflow pipe 12, which is
By flowing out of the perforated cylinder 10 through the holes 11, the sludge is settled toward the bottom of the pond, and the sludge is collected at the bottom of the pond by the scraping device 7 so as to be eliminated. An upper rotary cylinder 15 and a lower fixed cylinder 16 are provided above the rotary shaft 6. These are one of the means to attract scum water and temporarily hold them. Rotating cylinder 15
Is open at the bottom, and the fixed cylinder 16 is open at the top, and these are joined together up and down by a seal (O-ring or rubber band) 17 to form a closed room. The upper rotary cylinder 15 rotates together with the rotary shaft 6, and the lower fixed cylinder 16 is fixed regardless of the rotary shaft 6. Numeral 20 is a trough (one of means for attracting scum water and temporarily retaining them), which also serves as a conventional scraper and scum removing means. This trough 20 has a longitudinal shape and a J-shaped cross section. It has a similar shape. The front of the trough 20 is an induction port 22, which is lower than the water surface 24 and into which the scum 21 is introduced. The back wall 23 is a scraper, and the back wall 23 is a water surface.
It is a wall that rises above 24. One end of the trough 20 serves as a mounting portion, and is inserted into the rotary cylinder 15 and fixed by welding. Drop holes 25, 25 are provided at the bottom of this portion. The trough 20 rotates together with the rotary cylinder 15, and a roller 27 is provided at an end on the outer peripheral side by a bracket 26, and the roller 27 rolls on a step 28 of the peripheral wall 2. . In front of the front wall 29 of the trough 20, floats 31, 31 are provided so as to move up and down by a guide 30 on both right and left sides, and a weir 32 is provided on the front wall 29 by the floats 31, 31. The weir 32 moves up and down following the water surface 24, so that the dimension between the upper surface of the weir 32 and the water surface 24 is always kept constant. In addition,
The weir 32 is provided with a plurality of recesses 33... In the longitudinal direction, so that the large scum 21 is also drawn into the trough 20. A switch (means for opening and closing a valve 38, which will be described later, once per rotation) 35 is provided on the inner periphery of the pond 1, and is turned on / off when the bracket 26 rotates. From the bottom of the fixed cylinder 16, an outflow pipe (one of means for attracting scum water and temporarily retaining them) is provided so as to penetrate the peripheral wall 2. A scum pit 37 is provided correspondingly to a portion of the outflow pipe 36 outside the pond. A valve (one of means for stopping and releasing the discharge of the scum water) 38 is provided at an outlet portion of the outflow pipe 36, and opens and closes according to the switch 35. In addition, opening and closing of this valve 38 is quick when opening,
It is slow when closing. For this reason, a cylinder 41 having a throttle 39 and a check valve 40 is connected to the valve 38. Trough 20 is rotated and scums with water from the front
Attract 21…. The back wall 23 acts as a scraper. The scums 21 flow through the trough 20 so as to correspond to the center of the pond, and are guided into the fixed cylinder 16 through the drop ports 25, 25. The scums 21 in the fixed cylinder 16 are guided into the scum pit 37 through the outflow pipe 36. Guidance into the scum pit 37
When the roller bracket 26 is actuated to the switch 35, this causes the valve 38 to open and scum to flow into the scum pit 37. At other times, the valve 38 is closed so that the scum 21... Enters between the trough 20 and the outflow pipe 36. The scum is removed by this repetition. Here, the scum 21 is floating on the water in the pond and is not attracted into the trough 20 as it is. Therefore, the scum is mixed with some water, that is, the scum water becomes It is customary to be invited to In the case of this embodiment, after being drawn into the trough 20 as scum water, it is introduced into the rotary cylinder 15 through a flow path in the trough 20, guided into the outflow pipe 36, and stored therein. Outflow pipe 36
When the inside is full of scum water, it is stored in the rotary cylinder 15.
The scum water thus accumulated is sequentially accumulated as scum-mixed water as described above, and is drained through the outflow pipe 36 as it is, so that it is drained without sticking to a series of path walls and remaining. As shown in FIG. 4, the means for obtaining the state in which the scum is extracted and the state in which the scum is stopped may be such that a valve 38 such as a ball provided on the outflow pipe 36 is opened and closed by the rotation of the trough 20 itself. Good. In this embodiment, the actuator of the valve 38 is configured to be linked by a swing arm 44 with a roller 43. As shown in FIGS. 5 and 6, the means for obtaining the state in which the scum is withdrawn and the state in which the scum is stopped are provided with a roller 46 at the bottom of the walkway 4 and a roller 469 on the peripheral wall 3. Float 3 by rollers 46 and 46
Rollers 47,47 on 1,31 are pressed down and floats 31,31
31 and the weir 32 may be lowered to control the attraction of the scums 21. FIG. 7 shows that the trough 20 is attached to the scraping device 7 in place of the above embodiment in which the trough is supported by rollers on the outer periphery.
Is shown. That is, a stay 50 is erected from the scraping device 7, and the upper end of the stay 50 is connected to the bottom of the trough 20. In addition, the sewage inflow form of this pond flows horizontally through a hole formed in the peripheral wall 2. Therefore, the perforated cylinder is omitted. In addition, since the stay 50 is provided, the outflow pipe 36 is introduced into the rotary cylinder 15 from above and sucked by the pump 52 so as not to hit the stay 50. Pump 52
May be provided in the rotary cylinder 15 as shown. Further, the rotary cylinder 15 itself may be provided with a spiral portion 53 so that scum and water can smoothly enter the outflow pipe 36. Next, examples of proposals added to FIGS. 8 to 13 will be described. FIG. 8 shows a square settling basin with rounded corners 55. The trough 20 is provided in this pond in the same manner as described above, but the trough 20 does not act on the corner 55. Therefore, the one that removes the scum of the same part is presented here. In other words, in each part of corner 55,
An elastic piece 56 such as a rubber or a spring is provided which returns to a position indicated by a virtual line. The elastic piece 56 is kicked by the trough 20 and pushes the scum in the corner 55 in the rotation direction as shown by the solid line. FIG. 9 and FIG. 10 show another method. That is, it is sufficient to just open the end of the trough 20, but as shown in the figure, a small auxiliary trough 57 is provided at the end of the trough 20, and the trough 57 is configured to communicate with the trough 20. At the same time, the auxiliary trough 57 itself is provided with a weir (float type) 58 that can move up and down. In addition, this weir
58 is pressed down by rollers 60 of a bracket 59 extending from the outer periphery of the pond so that scum can enter. In addition,
At this time, the weir 32 in front of the trough 20 may be configured to rise up and close when the weir 58 opens. FIG. 11 shows another proposal example. Protrusion at the end of trough 20
61 are provided, and the rotating blades 62 provided in the corners 55 are rotated by the projections 61 to push the scum. FIG. 12 also shows another proposal example. In this pond into which sewage flows in from the side, there are cases where there is much scum on the side preceding rotation of the rotating trough 20, and cases where it is not. That is, the trough 20 shown by the solid line in FIG.
Although turning clockwise, in this case, since the inflow direction of the sewage and the rotation direction of the trough 20 match, the scum hardly enters the trough 20. From that point clockwise trough 20
When it rotates, it becomes a virtual line. In that case, the direction of rotation of the trough 20 and the direction of inflow of sewage are opposite to each other, so that the scum can easily flow into the trough 20. Therefore, it is preferable that the trough 20 is raised in the case of the trough 20 indicated by a solid line, and the trough 20 is lowered in the case of the trough 20 indicated by a virtual line so that scum can easily enter. The base of the trough 20 is supported by a bellows 63, and a projection 64 and a groove for lowering the roller 64 at the tip are provided on the pond as shown in FIG. The tendency is to form a continuous road surface such as a high part → slightly low part → lower part in a clockwise direction as shown by an arrow in FIG. The trough 20 is made to extend. As another method of moving the scum, as shown in FIG. 12, the nozzles 65 may be arranged corresponding to the corners of the outer periphery of the pond.

【The invention's effect】

As described above, the present invention provides a rotary shaft provided in the center of a pond in a vertical axis, a rake device provided around the rotary shaft to rotate on a pond bottom, and the rotary shaft corresponding to a position below water. An upper open, bottomed fixed cylinder provided on the upper outer periphery, an outflow pipe with one end communicating with the fixed cylinder and the other end communicating with the outside of the pond via an open / close valve, A rotating cylinder that is rotatably provided around the rotation axis and that is concentrically connected to the upper side of the fixed cylinder so as to be relatively rotatable; a back wall having a front wall in the rotation direction below the water surface and a back wall; Is a long member having a gutter-like shape projecting above the water surface, one end of which is inserted into the rotary cylinder in a communicating manner so as to be communicated with the rotary cylinder, and the other end is on the pond peripheral wall side. A tiger that is rotatably supported by rollers via rollers and that can rotate around with the rotary cylinder When, a rotary drive type scum removing apparatus in a circular sedimentation basin and means for opening and closing the on-off valve properly, the circumferential direction front side of the trough,
A weir having a long shape and provided with a plurality of notches in the longitudinal direction thereof is provided so as to be able to move up and down along the front wall, and the dam has an upper end other than the notch always lower by a certain amount from the water surface. It is characterized by a float that is guided up and down by a guide so that it is maintained at a level, so that even if the water level fluctuates, the ratio of scum and water is always constant and low, and it is smoothly induced As a result, troubles such as draining a large amount of water or difficulty in inducing scum as in the related art are eliminated. In addition, since the amount of extracted water is always kept low, the size of the next scum water separator can be reduced. In particular, since the upper end of the weir is not linear but has a recess, the scum of a general size can be also attracted by responding to a large scum while constantly attracting them. Also,
Since the trough is supported at a stable height by rollers on the outer periphery, the weir also maintains a constant height with respect to the water surface, and the attracted state is always constant.

[Brief description of the drawings]

FIG. 1 is a plan view of a pond showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view thereof.

FIG. 3 is a cross-sectional view of the trough portion of FIG.

FIG. 4 is a sectional view showing another embodiment.

FIG. 5 is a sectional view showing another embodiment.

FIG. 6 is an enlarged side view of the main part.

FIG. 7 is a sectional view of a pond showing another embodiment.

FIG. 8 is a plan view showing an additional proposed example, in which an elastic piece pushes a scum.

FIG. 9 is a plan view showing another scum pushing device.

FIG. 10 is an enlarged sectional view of a main part thereof.

FIG. 11 is a plan view showing another scum pushing device.

FIG. 12 is a plan view showing another scum pushing device.

FIG. 13 is a cross-sectional view showing a method for increasing the trough.

[Explanation of symbols]

1 ... circular sedimentation basin, 2 ... peripheral wall, 6 ... rotating shaft, 15 ... rotating cylinder, 16 ... fixed cylinder, 20 ... trough, 23 ... back wall, 24 ...
… Water surface, 27 …… roller, 29 …… front wall, 30 …… guide,
31 ... Float, 32 ... Weir, 33 ... Recess, 35 ... Switch, 36 ... Outflow pipe, 38 ... Open / close valve.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-44088 (JP, A) Japanese Utility Model Showa 60-21389 (JP, U) Japanese Utility Model Application Showa 60-24389 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) C02F 1/40 B01D 21/24

Claims (1)

(57) [Claims] 1. A rotating shaft provided in the center of a pond in a longitudinal axis, a scraping device provided around the rotating shaft to rotate on the bottom of the pond, and an outer periphery of the upper portion of the rotating shaft corresponding to below the water surface. A fixed cylinder with an open top and a bottom is provided, and an outflow pipe, one end of which is connected to the fixed cylinder and the other end of which is connected to the outside of the pond via an opening / closing valve, and which are vertically above and below the water surface. A rotating cylinder provided rotatably with the rotation axis around the rotation axis and connected concentrically to the upper part of the fixed cylinder so as to be relatively rotatable, a front wall in the rotation direction being below the water surface and a back wall being above the water surface. One end of the gutter-shaped elongate member is formed so as to protrude into the rotary cylinder and one end thereof is connected to the fixed cylinder so as to communicate with the fixed cylinder. A trough rotatably supported through the rotary cylinder and rotatable with the rotary cylinder; A rotary set scum removal device in a circular sedimentation basin comprising means for appropriately opening and closing a valve, wherein the trough is provided with a plurality of notches in a longitudinal direction on a front side in a circulating direction thereof in a longitudinal direction thereof. The weir is provided so as to be able to move up and down along the front wall, and the weir has a float guided up and down by a guide so that the upper end side other than the recess is always kept at a level lower than the water surface by a certain amount. A rotary drive type scum removing device for a circular sedimentation basin, which is provided.