JPS6010799Y2 - Continuous dewatering equipment for sludge, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dewatering device useful for continuous dewatering treatment of sludge.

Conventional belt pressurized continuous dewatering machines have a phenomenon in which the sludge backslides when it is bitten, and sludge with a high moisture content tends to escape from the pressurized surface.In addition, when solid foreign matter is mixed in, the pressure is applied to the vicinity of the foreign matter. This has the disadvantage that an imbalance occurs and the belt is damaged.

There is also a conventional technique in which a polymer flocculant is added to the object to be dehydrated and the material is granulated into a semi-dehydrated state using a granulator, but this method has the disadvantage of increasing the processing cost.

Therefore, as an improved version of the belt pressurization type, the filter cloth belt that carries the material to be removed gets into the mesh of the running net, and the material to be removed is caught between the filter cloth belt, which swells in each mesh, and the rotating drum. Devices have been proposed in which the liquid material is pressurized between the rotating drum and the pressure roller, but these devices are very unsatisfactory.

Firstly, the material to be drained cannot be pressurized beyond the gripping force of the mesh, which is limited by the stretching force of the running net, so the draining ratio is insufficient, and secondly, the material to be drained is not placed on top. Since the filter cloth belt continuously enters between the running net and the drum, when the material to be deliquid is caught between the belt and the drum, the material to be deliquid is caught even though the capture is insufficient. Because the sludge is subjected to pressure based on the stretching force of the running network, a backflow or leakage phenomenon occurs.Thirdly, the captured sludge is pressurized by the roller, so even if the roller or rotating drum is made to have elasticity. This is because the pressurizing action cannot be made sufficiently uniform.

On the other hand, vacuum dehydration type dehydration equipment has been used in the past, but it has the disadvantage that the service life is significantly shortened due to filter cloth clogging, and the dehydration ratio is extremely inferior to that of the pressurized type when the amount of filtration is large.

Therefore, the present invention eliminates the drawbacks of the prior art and provides a chamber on the outer circumferential surface of the rotating body, and as the rotating body rotates, sludge, etc. is fed into the chamber, and then the chamber is closed, and compressed air is supplied to the chamber. The object of the present invention is to provide a dewatering device that sequentially repeats the process of performing soft pressing dehydration treatment by, etc., and then discharging the treated object.

Next, one embodiment of the present invention will be described based on the drawings. Fig. 1 is a side view showing a partial longitudinal section of the device, and Figs. 2 and 3 are views of the device before or during compression. It is a partially enlarged sectional view, and 1 in the figure represents the main roller.

The main roller 1 is supported by bearings (not shown) at both ends of a main shaft 2 that passes through its center, and rotates clockwise at low speed in the figure due to power. A chamber 6 is formed.

Further, the inner filter cloth 7 is wound around between the main roller 1 and the roller 8, and covers the inner surface of the chamber 6 on the outer periphery of the main roller 1.

A hopper 11 is located above the main roller 1 and feeds the sludge 10 into the chamber 6.

21 represents a cover.

The cover 21 is wound around between the four rollers 22, 23, 24, and 25, and covers each chamber 6 located approximately on the right half of the main roller 1 in the drawing.

Reference numeral 31 denotes an air supply pipe provided for each chamber 6, and when the chamber 6 is in a position where its entire length is covered by the cover 21 (from angle A to angle B in the figure), the container pipe 31 When the valve 32 provided in the middle is opened by the cam action of the cam surface 33, compressed air is supplied into the chamber 6, and conversely, the chamber 6 is at least partially uncovered. When in position (from angle B to angle A in the figure), valve 3
2 becomes closed and air supply stops.

In FIG. 2, the structure of the outer surface of the main roller 1 is as follows:
A rubber plate 4 with water passage grooves 4a is laid on the outer surface of the outer circumferential body 3 that penetrates through the rubber plate 4, and an outer frame body 5 is fixed on the rubber plate 4, and the outer frame body 5 consists of side plates 5a and partition plates 5b. Thus, a chamber 6 for receiving sludge 10 is opened on the circumferential surface of the main roller 1.

The structure of the cover 21 is such that an outer filter cloth 2 is placed on the chamber 6 side of the belt 26.
7 is pasted, and the belt 26 has a large number of drainage holes 26a.
It has the following.

Now, to explain the function of this device, Aiko Hopper 11
As the main roller 1 rotates, the sludge sent to the sludge is supplied into the chamber 6 located above the main roller 1 and rides on the inner filter cloth 7 in the chamber 6.

When the main roller 1 rotates further, the chamber 6 is sealed by the cover 21, and the rubber plate 4 is placed in the chamber 6 by the action of the valve 32.
Compressed air is sent through the air pipe 31 from below the third
As shown in the figure, the sludge in the chamber 6 is compressed and dehydrated by the expanded rubber plate 4.

A part of the dehydrated water passes through the outer filter cloth 27 and is drained from the drain hole 26a of the cover 21, and the remainder passes through the inner filter cloth 7 and is guided to the water passage groove 4a of the rubber plate 4. and is discharged from a drainage hole 5c formed in the side plate 5a.

When the chamber 6 reaches a predetermined position B on the outer periphery of the main roller, the desired dehydration is completed, the compressed air is released to the atmosphere, and the cover 21 is guided by the roller 25 and separated from the main roller 1.

The dehydrated and solidified sludge also leaves the main roller 1 placed on the outer filter cloth 27 and is transferred from the roller 25 to the conveyor 41.
The waist falls onto the top and is then ejected.

In addition to providing the scraper 42 at the position where the sludge falls from the cover 21, a scraper or the like may be appropriately provided at the position where the sludge leaves the inner filter cloth 7.

The main roller 1, inner filter cloth 7, and cover 21 after the liquid removal process
The sludge is rotated or revolved, returns to its original position, and takes part in receiving or sealing the sludge again.

The present invention is based on the above configuration, and its effects are as follows.

(1) Since the dewatering device of the present invention statically pressurizes the sludge at a uniform pressure using air pressure in a sealed chamber, damage to the cover etc. is less likely to occur and a uniform dewatering ratio can be obtained.

(2) Since the sludge is fed into the room in a non-pressurized state, it is possible to keep the backflow phenomenon caused by clogging to a minimum.

(3) Since continuous processing can be performed using a rotary system while enjoying the above effects, the processing effect is high.

(4) The dewatering device of the present invention applies soft pressing dewatering treatment to the sludge as much as it can withstand within the tension range of the cover, and uses the tension of the cover to apply pressure from the outside to the chamber. Therefore, there is no need for any external pressure device to add to the tension of the cover, and therefore the device itself is simple, mutually lightweight, and can be made cheaper.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view showing a part of the dehydrating device in longitudinal section; FIG. 2 is a partially enlarged sectional view showing the interior of the device in an uncompressed state; FIG. 3 is a partially enlarged sectional view showing the compressed state inside the room. 1...Main roller, 6..., Chamber, 7...
...Inner filter cloth, 10...Sludge, 11...
...Aiko Hoppa, 21...Cover, 26...
...Belt, 27...Outer i cloth, 31...
... Air pipe, 32 ... Valve, 33 ... Cam surface, 41 ... Conveyor.

Claims (1)

[Scope of utility model registration request] A plurality of chambers are arranged in series on the circumferential surface by an outer frame body, and each chamber has a main roller configured such that a rubber plate on the bottom surface is expanded in the centrifugal direction by air supply, and the circumferential surface of the main roller is arranged in a circumferential shape. A filter cloth is arranged to rotate and cover the bottom of the chamber, a supply means for supplying the object to be deliquified such as sludge to each chamber, and a filter cloth that rotates together with the main roller to supply each chamber approximately half of the circumferential surface of the main roller. In a continuous dehydrating device comprising an endless cover disposed to close the lid while moving, and a drive mechanism for each of the rotating bodies, the cover faces the chamber of a rubber belt having a large number of drainage holes penetrating the front and back sides. 1. A continuous dewatering device for sludge, etc., characterized in that a filter cloth is attached to a surface of the chamber and the filter cloth rotates as a unit, and drainage holes are provided in the side plates of each of the chambers.