JPS625831Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dewatering device for dewatering sludge generated in sewage treatment, human waste treatment, industrial wastewater treatment, etc.

There are methods for dewatering sludge, such as vacuum filtration, pressure filtration, and centrifugal dehydration, but the dehydration effect is low;
There are drawbacks such as a small throughput, and in recent years a pressure belt dehydration method has been adopted as a method to improve these drawbacks. In this pressurized belt dewatering method, a coagulant is added to the sludge to cause it to coagulate, which is then dehydrated by gravity on a mesh-like cloth belt. This method compresses sludge and squeezes out the water.

In this method, the dewatering effect depends on the magnitude of the clamping pressure on the cloth belt between the rolls and the length of the pressurizing time, but if the cloth belt is simply clamped with the rolls, the pressurizing time is extremely short; Even if a large number of pairs of clamping pressure rolls are installed, the pressing time does not become long. Further, a plurality of pressure rolls are provided along both sides of the cloth belt, and the pressure roll on one side is positioned between the pressure rolls on the other side so that the cloth belt is pressed by the pressure rolls. Then, the cloth belt is pressed in a wave shape along the pressure rolls on both sides, and the pressing time can be increased by increasing the number of pressure rolls, but the cloth belt is, so to speak, a cloth stretched between the rolls. Since the belt is pressed by the rolls in the middle, the pressing force from the rolls acts to increase the tension of the cloth belt, and it is difficult to increase the pressing force due to problems with the strength of the cloth belt. Both methods had the disadvantage that they were unable to sufficiently lower the water content of sludge.

Furthermore, when the sludge is squeezed between the cloth belts, the sludge spreads and protrudes from the cloth belts, so the width of the sludge supplied onto the cloth belts has to be narrowed, making it impossible to effectively utilize the width of the cloth belts.

The present invention solves the drawbacks of the conventional pressurized belt dewatering method as described above, and can apply large clamping pressure to the cloth belt over a long period of time, making it possible to produce sludge with a low moisture content, and at the same time, it is possible to reduce the clamping pressure. The purpose of the present invention is to provide a dewatering device in which sludge does not sometimes protrude from a cloth belt.The gist of the dewatering device is to provide a dewatering device in which a pressurizing device for pinching a pair of endless cloth belts is provided in a joining section of a pair of endless cloth belts. The fabric belt is pinched from both sides in a zigzag manner along the rolls by a set of multiple pressure rolls, one pressure roll being positioned between the other pressure rolls, and each of the sets of pressure rolls is An endless belt with high tensile strength and having an elastic material layer on the side that contacts the cloth belt is stretched along the outer periphery, and elastic strips are provided along both opposing ends of the cloth belt. The invention resides in a dehydration device characterized by the following.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a side view showing an example of the present invention, in which upper and lower endless cloth belts 1 and 2 are attached to rotate with a joining section.
A pressure device 3 for clamping the cloth belts 1 and 2 is provided in the joining section.

The pressure device 3 includes a plurality of pressure rolls 41, 42, 43 and 5 for pinching the cloth belts 1 and 2.
Sets 4 and 5 of pressure rolls 1, 52, 53, and 54 are arranged on both sides of cloth belts 1 and 2, and endless belts 6 and 7 are wrapped around these sets of pressure rolls 4 and 5. The set of pressure rolls 4 is provided so that the pressing force can be adjusted toward the set of pressure rolls 5 by a pressing tool 8 such as a hydraulic or pneumatic cylinder. It is preferable that the pressing tool 8 is provided on each of the pressing rolls 41, 42, 43 of the pressure roll set 4, and that the pressing force can be adjusted independently, since the pressing force can be gradually increased.

Each pressure roll 41 in the set 4 of pressure rolls,
42 and 43 are located between the pressure rolls 51, 52, 53, and 54 in the set of pressure rolls 5, and are designed to pinch the endless belts 6 and 7.

The endless belts 6, 7 may be made of leather belts, rubber belts, hemp belts, steel belts, etc. as long as they have a high tensile strength, but the surfaces of the endless belts 6, 7 in contact with the cloth belts 1, 2 may be is the elastic material layer 61,
71 is provided. This elastic material layer 61, 71
The material is preferably easily deformable, such as a soft porous material foamed at a high magnification, a nonwoven fabric, a pile fabric, or a rubber-like elastic material having an uneven surface. The endless belts 6, 7 and the elastic material layers 61, 71 have an elastic material layer 6.
It is preferable that a large number of through holes are provided leading from the front surface of the endless belts 1 and 71 to the back surfaces of the endless belts 6 and 7.

Elastic band-like bodies 11, 11 and 21, 2 are provided along the belts at both ends of the facing surfaces of the cloth belts 1, 2.
1 is provided, and in the joining section of the cloth belts 1 and 2, the elastic band-like bodies 11 and 21 are overlapped. This elastic band 1
1 and 21 are preferably easily deformable, for example, a soft porous material with a relatively large expansion ratio is optimal, and they may be glued or sewn to both ends of the cloth belts 1 and 2. , or attached with a fastener. The elastic band-like bodies 11, 21 usually have a thickness of 5 mm, depending on the dimensions of the cloth belts 1, 2.
~20mm, preferably with a width of 50-100mm. Further, the elastic band-like body may be provided on either one of the cloth belts 1 or 2.

In this example, the sludge dewatering process is performed by supplying the sludge onto the cloth belt 2, joining the cloth belt 1 thereon, and squeezing the cloth belts 1 and 2 by the pressure device 3. Cloth belt 1, 2
First, the elastic band-like bodies 11 and 21 at both ends are overlapped and then pinched, so the sludge sandwiched between the cloth belts 1 and 2 is transferred to the cloth belts 1 and 2.
is dammed at both ends by the elastic band-like bodies 11 and 21. Also, as the clamping pressure increases, the elastic band 11,
Since the sludge 21 is also compressed and compressed, it is possible to prevent the sludge from extruding even if the force for extruding the sludge increases. The dewatered sludge is sent to the scrapers 12 and 22.
is removed from the cloth belts 1 and 2 by.

When sludge is squeezed between cloth belts 1 and 2,
Each pressure roll 41, 42, 4 of pressure roll set 4
3 is each pressure roll 51, 5 of set 5 of pressure rolls.
2, 53, 54, an endless belt 6,
7, the fabric belts 1 and 2 are continuously pinched and pressed for a long time along the traveling direction, and the fabric belts 1 and 2 are lined with endless belts 6 and 7. Therefore, it can be pressed strongly and the sludge can be made with a low moisture content.
In addition, since the endless belts 6, 7 are provided with elastic material layers 61, 71, the elastic material layers 61, 71 are compressed and deformed in the area where the sludge is present, and the cloth belts 1, 2 are also deformed accordingly. Since the cloth belts 1 and 2 are pressed together at both ends of the belts 1 and 2, the elastic bands 11 and 21 at both ends of the cloth belts 1 and 2 facing each other are pressed more strongly to wrap around the sludge and remove the sludge. is prevented from protruding from both sides of the cloth belts 1, 2, and the cloth belts 1, 2 can be clamped with strong clamping pressure.

Furthermore, in the present invention, the gap between the pressure rolls in the pressure roll set 3 or 4 is made smaller than the diameter of the pressure rolls, and the fabric belts 1 and 2 are arranged in the pressure roll set 3 or 4.
It is clamped between rolls 4 and 4, and is clamped in a zigzag pattern along the roll surface.

The dewatering device of the present invention is preferably incorporated into a conventional dewatering device as a clamping pressure dewatering means at the final stage of clamping the fabric belt.

As mentioned above, in the dewatering device of the present invention, an endless belt with a high tensile strength provided with an elastic material layer is stretched along the outer periphery of each set of pressure rolls. The cloth belt is lined with a cloth to increase the pressing force of the pressure roll, and since the cloth belt is clamped in a zigzag pattern along the pressure roll, it is continuously clamped over a long period of time, and the sludge is Moisture content can be lowered. In addition, elastic band-like bodies are provided along both opposing ends of the cloth belt, and when the cloth belts are pinched together, the elastic band-like bodies are pinched more strongly, so strong clamping pressure is applied to the sludge. It is possible to prevent sludge from spilling out in the width direction of the cloth belt even if the belt is wet, and the sludge can be strongly compressed between the cloth belts to form sludge with a low water content.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the dewatering device of the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. 1, 2... Endless cloth belt, 11, 12... Elastic band-like body, 3... Pressure device, 4, 5... Pressure roll set, 41, 42, 43, 51, 52, 53,
54... Pressure roll, 6, 7... Endless belt, 6
1, 71... Elastic material layer, 8... Pressing tool.

Claims (1)

[Scope of utility model registration request] In a dewatering device in which a pressure device for pinching and pressing a pair of endless cloth belts is provided in a joining section of the pair, the cloth belts are formed of a plurality of cloth belts with one pressure roll located between the other pressure rolls. A tensile strength belt is pressed in a zigzag manner along the rolls from both sides by a set of pressure rolls, and an elastic material layer is provided along the outer periphery of each set of pressure rolls on the side of the contact surface with the cloth belt. A dewatering device characterized in that a large endless belt is stretched around the cloth belt, and elastic band-like bodies are provided along both opposing ends of the cloth belt.