JPS6124385Y2 - - 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, and the sludge is dehydrated by gravity on a mesh-like cloth belt. This method compresses the 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; however, if the cloth belt is simply clamped between 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 fabric belt, and the pressure roll on one side is positioned between the pressure rolls on the other side, so that the fabric 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 have the disadvantage that they cannot sufficiently reduce the dewatering rate of sludge.

The present invention eliminates the drawbacks of the conventional pressurized belt dewatering method as described above, and creates a dewatering device that can apply a large clamping pressure to a cloth belt for a long period of time, and that can produce sludge with a low moisture content. The gist of this paper is to provide a dewatering device in which a pressure device for pinching a pair of endless fabric belts is installed in the joining section of the fabric belt, in which one pressure roll is used to press the other fabric belt. It is pressed in a zigzag manner from both sides by a set of pressure rolls located in the middle of the pressure rolls, and an elastic material layer is formed along the outer periphery of each set of pressure rolls on the side of the contact surface with the cloth belt. The present invention resides in a dewatering device characterized by being provided with an endless belt having a large tensile strength.

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 respective pressure rolls 51, 52, 53, and 54 in the set of pressure rolls 5, so as to clamp the endless belts 6 and 7 and the cloth belts 1 and 2.

The endless belts 6 and 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 and 7 that are in contact with the cloth belts 1 and 2 is the elastic material layer 61,
71 is provided. This elastic material layer 61, 71
The material is preferably easily deformable, such as a high-magnification foamed soft porous material, a non-woven fabric, a pile fabric, or a rubber-like elastic material having an uneven surface. The endless belts 6 and 7 and the elastic material layers 61 and 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.

In this example, the sludge dewatering process is
Sludge is supplied onto the cloth belt 2, the cloth belt 1 is joined onto it, and the cloth belts 1 and 2 are clamped and pressed by the pressurizing device 3. The dewatered sludge is removed from the cloth belts 1, 2 by scrapers 11, 21.

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 high tensile strength is stretched along the outer periphery of each set of pressure rolls. The pressing force can be increased, and the sludge can be strongly squeezed between the cloth belts to form sludge with a low water content.

In addition, since the cloth belt is pinched in a zigzag manner from both sides by a set of pressure rolls with one pressure roll positioned between the other pressure rolls, the gap between the endless belts increases as the clamping pressure increases. Since the sludge is compressed for a long period of time, the water content of the sludge can be further reduced.

In addition, since the elastic material layer is provided on the contact surface side of the endless belt with the cloth belt, the sludge that is squeezed and dehydrated between the cloth belts is prevented from being pushed out in the width direction of the cloth belt. The cloth belt can be clamped with such strong clamping pressure.

[Brief explanation of the drawing]

FIG. 1 is an explanatory 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. 1, 2: Endless cloth belt, 3: Pressure device, 4,
5: Pressure roll set, 41, 42, 43, 51,
52, 53, 54: Pressure roll, 6, 7: Endless belt, 61, 71: Elastic material layer, 8: Press 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. An endless belt with high tensile strength, which is pressed in a zigzag manner from both sides by a set of pressure rolls, and an elastic material layer is provided on the side of the contact surface with the cloth belt along the outer periphery of each set of pressure rolls. A dehydration device characterized by being hung over the