JP2000117006A - Sludge recovering device for sewage treating vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge sludge settled on the bottom of a sewage treating vessel with a simple means. SOLUTION: Many sludge discharge ports 2 are arranged at a fixed interval on the bottom 1b of the sewage treating vessel 1, the lower end of each discharge port is made to communicate with a piece of a discharge pipeline 3 and a valve body 4 for opening and closing each discharge port 2 is placed on the upper end of each discharge port 2. A bracket 12a is projectingly disposed on the upper surface of the valve body 4 and supports a roller type cam driven member 12. A sludge collecting plate 6 widely covering the bottom part 1b is placed on a guide rail 5 and is tugged by a wire 8 to be moved a little above the bottom part 1b and the valve body 4. A pair of the cams curved upward in a circular arc state are arranged on the under surface of the sludge collecting plate 6 in the moving direction and when the sludge collecting plate 6 reaches above the valve body 6, the cam enters to the under surface of a roller 12c of the driven body 12 and pushes up to open the valve body 4. The sludge on the lower side of the sludge collecting plate 6 is pushed into the discharge port 2 by water pressure and flows out from the discharge pipe line 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used for recovering sludge settled at the bottom of a sewage treatment tank.

[0002]

2. Description of the Related Art In a conventional sludge collecting apparatus, a bottom groove lower than a horizontal bottom is provided at an end of a sewage treatment tank, and a scraping blade in contact with the bottom of the treatment tank is provided in parallel with the bottom groove. Means have been used in which the sludge is scraped and dropped into the bottom groove while moving to the bottom groove, and the sludge collected in the bottom groove is discharged by another scraping blade or a suction pump.

[0003] According to this means, since the entire amount of sludge is moved by the scraper blades, a rugged device for transmitting a large force is required, which is expensive.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to recover sludge by simple means.

[0005]

According to one aspect of the present invention, a plurality of sludge discharge ports are arranged at intervals in a bottom of a sewage treatment tank as described in claim 1. At the upper end of each sludge discharge port, a valve body for opening and closing the sludge discharge port is provided so as to be vertically movable, and the lower end of each sludge discharge port is connected to a series of discharge pipes to widely cover the valve body and the surrounding tank bottom. A wide mud collecting plate is provided so as to sequentially move above each valve body while maintaining a constant gap between the bottom of the tank and the upper surface of the valve body. A valve device comprising a cam extending in the moving direction of the plate and a driven member pushed up by the cam is provided.

According to this means, when the collecting plate moves onto the valve body, the valve body is raised by the valve opening device by the cam to open the sludge discharge port, and the sludge below the collecting plate is pressed by the water pressure. Then, it flows into the sludge discharge port and flows out from the discharge line. As the mud collecting plate continues to move, the open valve body closes and the next valve body opens to perform the same operation.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a sewage treatment tank, 1
a is the side wall and 1b is the bottom. When the sewage F is introduced into the treatment tank 1 as shown in FIG. 2, the sedimentable sewage in the sewage F gradually precipitates and the sludge M is formed on the bottom 1b. Accumulate. In the present invention, the sludge M is automatically discharged. A plurality of sludge discharge ports 2 are provided downward at regular intervals on the bottom 1b, and the lower end of each sludge discharge port 2 communicates with one discharge conduit 3. Sludge discharge port 2
A valve body 4 capable of opening and closing the opening is provided on the opening at the upper end so as to be movable up and down, and four guide pins 4a fixed to the lower surface thereof are loosely inserted into guide holes 4b provided in the bottom 1b. ing. A pair of guide rails 5 is laid near the side wall 1a at the bottom 1b.
This guides the mud plate 6.

The mud collecting plate 6 has a roof 6b on a quadrilateral plate 6a.
And four wheels 7 are pivotally supported on the left and right sides of the front part and the rear part, and the wheels 7 and the guide rails 5
The mud collecting plate 6 moves so as to keep a constant distance from the bottom 1b. As a driving means for causing this movement, an endless wire 8 is connected to the end in the moving direction, and the wire 8 is wound around a pulley and driven. In addition,
Instead of the driving means using the wire 8, a transmission chain may be extended endlessly along one or both guide rails 5 and the transmission chain may be driven by a sprocket. A cover 9 is provided on the guide rail 5 in an eaves shape so that sludge does not accumulate on the rail.

When discharging the sludge, the valve body 4 of the sludge discharge port 2 is pulled up and opened, and when the discharging is completed, the valve body 4 is closed. Valve 2
2 and a pair of long rod-shaped cams 11 that are curved so that the middle part is high are provided on the mud collecting plate 6 side.
The cam 11 is attached to the mud collecting plate 6 by an inwardly bent L-shaped support 11a, as shown in FIG. The cam 11 extends parallel to the direction in which the sludge discharge ports 2 are arranged, that is, the direction in which the sludge collecting plate 6 moves.

On the other hand, a driven member 12 is provided on the valve body 4 side. The driven member 12 includes a bracket 12a projecting upward from the valve body 4 and a pin shaft 12 supported by the bracket 12a.
b, a roller 12c attached to the pin shaft 12b,
When the mud collecting plate 6 moves in the direction of arrow A, the cam 11 comes in contact with and separates from the lower side of the roller 12c.

With the above structure, when the mud collecting plate 6 is pulled by the wire 8 and moves on one valve body 4, the cam 11
The lower end portion of the roller contacts the lower surface of the roller 12c of the driven member 12, and gradually pushes up the roller 12c as the mud collecting plate 6 advances, thereby pushing up the valve element 4 as shown in FIG. To release. Then, the sewage F tries to flow into the sludge discharge port 2 from the periphery of the sludge collecting plate 6 through the lower surface of the sludge collecting plate 6 due to the water pressure, and the action of flushing the sludge M accumulated on the bottom 1b by the water flow. As a result, the sludge M in the lower part of the sludge collecting plate 6 and the surrounding part thereof is transferred to the sludge discharge port 2 as shown by the arrow.
And discharged from the discharge line 3.
At this time, since the water flow is considerably disturbed at the lower part of the sludge collecting plate 6, the sludge on the valve body 4 also flows down and flows out. Since the upper surface of the sludge collecting plate 6 is the roof 6b, the sludge accumulated here gradually falls to the bottom 1b due to the inclination of the roof 6b and the water flow in the tank, and is discharged together with other sludge. You.
If a suction pump is provided downstream of the discharge line 3, the sludge discharge operation is further improved.

When the sludge collecting plate 6 moves rightward from the state shown in FIG. 2, the opened valve body 4 descends along the inclination of the cam 11 due to its weight and water pressure, and closes the sludge discharge port 2. Then, when it overlaps with the next valve element 4, the same action as described above occurs to open the valve element 4 and flush the surrounding sludge M to the discharge port 2. When the collecting plate 6 reaches the end, the same operation is performed while returning.

In the above description, the cam 11 is provided on the mud plate 6 side and the driven member 12 is provided on the valve body 4 side.
The center of the curve is opposite to the one shown in the figure, and the center is low, and it is mounted on the valve body 4 side, the driven member 12 is provided on the mud plate 6 side, and the roller 12c of the driven body 12 is in contact with the lower surface of the cam 11. Alternatively, the cam 11 may be pushed up by the roller 12c to open the valve. Further, the driven member 12 can be changed to a simple sliding piece that does not use the roller 12.

In the above-described embodiment, the case where only one sludge collecting plate 6 is used has been described. However, in a long sewage treatment tank, the sludge discharge ports 2 are divided into groups of the same number, and each group has one. The sludge collecting plate 6 may be provided. In a wide sewage treatment tank, the sludge discharge port 2 and the sludge collecting plate may be provided in parallel.

[0015]

As is apparent from the above description, according to the present invention, the valve body is opened and the sludge flows out only by moving the sludge collecting plate onto the valve body. Although the closing action can be performed automatically, the structure required for this is extremely simple, and since the sludge flows by the flow of the waste water, there is an effect that the sludge does not diffuse into the waste water again. In addition, the force applied to this device is only the force for moving the collecting plate, and the resistance to the movement is not particularly large. Therefore, there is an advantage that the device does not need to have a sturdy structure.

[Brief description of the drawings]

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

FIG. 2 is also a longitudinal side view

FIG. 3 is also a longitudinal front view

FIG. 4 is a perspective view of a valve train.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage treatment tank 1b Bottom part 2 Sludge discharge port 3 Discharge line 4 Valve body 5 Guide rail 6 Mud collecting plate 7 Axle 8 Wire 9 Cover 12 Follower member

Claims (5)

[Claims] A plurality of sludge discharge ports are arranged at intervals at the bottom of a tank of a sewage treatment tank, and a valve body for opening and closing the sludge discharge ports is provided at an upper end of each sludge discharge port to be movable up and down. The lower end of the outlet is connected to a series of discharge pipes, and the valve body and the surrounding mud plate having a wide area covering the bottom of the tank are separated from each other while maintaining a certain gap between the bottom of the tank and the upper surface of the valve body. Are provided so as to be sequentially moved above, and at the center of the lower surface of the mud plate and the upper surface of the valve body, a valve device including a cam extending in the moving direction of the mud plate and a driven member pushed up by the cam is provided. A sludge recovery device for a sewage treatment tank, characterized in that: 2. The cam of claim 1, wherein the cam of the valve operating device is fixed to a mud collecting plate with a pair of left and right cam surfaces having a middle portion having a high arc shape, and the driven member is in contact with the cam surface. A sludge collection device for a sewage treatment tank, comprising a pair of members and fixed to a valve body. 3. The sludge recovery device for a sewage treatment tank according to claim 1, wherein a suction pump is connected downstream of the drainage pipe. 4. The sludge collecting apparatus for a sewage treatment tank according to claim 1, wherein the upper surface of the sludge collecting plate has a roof shape having a high center portion and a low peripheral portion. 5. The sludge collecting plate according to claim 1, wherein guide rails are laid on both sides of the sludge discharge line, an axle supported by the sludge collecting plate is supported by the guide rail, and a traction member is connected to the sludge collecting plate. A sludge recovery device for a sewage treatment tank, characterized in that: