JPH0735677Y2 - Belt press dehydrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a belt press dewatering machine, and more particularly to a dewatering machine characterized by the structure of a rotating roller for pressing a filter cloth belt.

(Prior Art) In the prior art, as in the invention described in JP-A-60-203399, the interval between a pair of highly cloth-permeable filter cloth belts that run along the peripheral surface of a rotating drum is gradually reduced. By doing so, it is known that the water contained in the raw material sandwiched between the filter cloth belts is separated.

In the belt pressurization type dehydrator, when the raw material is sludge containing a large amount of water, the free water of the raw material on the filter cloth is separated by natural gravity dehydration near the raw material input part, and then the raw material does not escape. It is dehydrated by gradually applying pressure with a weak force, and finally by applying high pressure to dehydrate.

In the above-mentioned conventional technique, the filter cloth belt is pressed by the rotary drum having the surface provided with the drainage groove. Therefore, substantially no space is formed between the filter cloth belt and the peripheral surface of the rotary drum. For this reason, the filter cloth belt is wound around the entire surface of the rotary drum, and is uniformly pressed against the drum surface by the tension of the filter cloth belt to extend the raw material, so that so-called side leak in which the raw material leaks from the side of the belt easily occurs. For this reason, the operation speed of the filter cloth belt must be slowed for soft materials, or the material supply width must be 60 to 70% of the width of the filter cloth belt for operation. There is a problem that the processing capacity of is poor. Further, in the belt press, when a plurality of rotary rollers are used for printing, the surface of the filter cloth contacting the rotary rollers differs from roller to roller, and the belt in contact with the rollers slides and the outer belt is pulled. For this reason, the belt that comes into contact with the rotating roller has a smaller friction coefficient and is more slippery, so that the belt is not damaged.

(Problems to be solved by the invention) The present invention provides a belt press dehydrator that can pressurize and dehydrate without causing side leak even if the raw material is soft sludge containing a large amount of water. It is an object.
Another object of the present invention is to provide an energy-saving belt press dehydrator that prevents damage to the filter cloth belt.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a plurality of filter cloth belts sandwiching a raw material on a peripheral surface of a rotary roller which presses the plurality of filter cloth belts in a width direction of the filter cloth belt. It is characterized by the provision of ridges.

(Operation) The raw material is supplied between the pair of filter cloth belts 5 and 7, and the filter cloth belts 5 and 7 are provided on the peripheral surfaces of the rotating rollers 1 and 2 with the ridges 1a and 2
Runs in contact with a. For this reason, a gap is formed between the surface of the rotating rollers 1 and 2 and the filter cloth belts 5 and 7, and the gap allows the filter cloth belts 5 and 7 to bend toward the rotating rollers 1 and 2 side. The raw material supplied between the filter cloth belts 5 and 7 is compressed while being wrapped in the belt.

Therefore, even a raw material such as sludge containing a large amount of water can be appropriately dehydrated with a small amount of side leak. Further, since a gap is secured between the filter cloth belts 5 and 7 and the outer peripheral surfaces of the rotating rollers 1 and 2, the separated filtrate is easily discharged.

(Embodiment) FIG. 1 is a side view showing the structure of a belt press dehydrator according to the present invention. A first rotating roller 1, a second rotating roller 2, and a third rotating roller which are driven to rotate by a driving device (not shown).
, 4f via the guide rollers 4a, 4b, ..., 4f to stretch and hold the first filter cloth belt 5,
To the third rotating rollers 1, 2, 3 by tensioning and holding the second filter cloth belt 7 through a part of the guide roller and the auxiliary rollers 6a, 6b, ..., 6e, Are configured.

The second filter cloth belt 7 extends so as to project more than the first filter cloth belt 5, and a raw material hopper 8 supplies a raw material containing a large amount of water to the projecting second filter cloth belt 7. 9a, 9b, 9c and 9d are preloading rollers, 10 is an outlet for the dehydrated cake, 11a and 11b are drainage receivers, 12 is a first rotating roller 3
And a backup belt for pressing the second filter cloth belts 5, 7 with a strong force.

The first and second filter cloth belts 5 and 7 are made of, for example, a mesh cloth, a metal net, a sponge-like member, porous rubber, porous plastic, etc. ing.

The first and second rotating rollers 1 and 2 form a low-pressure dehydrating section, and the third rotating roller 3 forms a high-pressure dehydrating section.
According to FIGS. 2 and 3, the first and second rotating rollers 1, 2
By providing a plurality of protrusions 1a, 2a along the width direction of the filter cloth belts 5, 7 (axial direction of the rotating rollers) on the outer peripheral surface of the filter cloth belts 5, 7, the protrusion cloths 1a, 2a are formed. I am trying to support it.

Further, the heights and intervals of the ridges 1a and 2a are set so that the straight line connecting the vertices of the ridges 1a and 2a adjacent to each other circumscribes the outer peripheral surface of the main body of the rotating rollers 1 and 2. The filter cloth belts 5 and 7 can be stably supported while maintaining a gap between the filter cloth belts 5 and 7 and the outer peripheral surfaces of the rotating rollers 1 and 2. The ridges 1a and 2a are formed by welding, for example, round bars or pipes to the outer peripheral surfaces of the rotating rollers 1 and 2.

In the embodiment configured as described above, in the belt press dewatering machine provided with the first and second rotating rollers 1 and 2, the first and second filter cloth belts 5 and 7 holding the raw material are the second As shown in the figure, the rollers 1 and 2 are in contact with each other via the ridges 1a and 2a. Therefore, since a gap is formed between the filter cloth belts 5 and 7 and the outer peripheral surfaces of the rotating rollers 1 and 2, the filter cloth belt located on the inner side of rotation is bent toward the roller side by the amount of this gap and is rotated on the outer side of rotation. Wrap the raw material with the belt.

Therefore, the raw material supplied between the filter cloth belts is not rapidly compressed, and the side leak of the raw material is prevented in combination with the wrapping action of the filter cloth belts 5 and 7.

Incidentally, in the prior art, when the raw material was supplied at a width of 60 to 70% of the width of the belt, side leak occurred. Side leakage did not occur even when the width was supplied, and the operating speed of the filter cloth belts 5 and 7 could be approximately doubled.

In the embodiment, the ridges 1a and 2a are arranged along the width direction of the rotary rollers 1 and 2, but in the embodiment shown in FIG. Refractive ridge 1 which is bent so as to be displaced forward or backward in the rotation direction of
b and 2b are provided.

As in the embodiment shown in FIG. 4, when the birefringent birefringent refraction ridges 1b and 2b are provided, the degree of elongation of the raw material can be adjusted by the refraction angle of the ridges.

Further, although the protrusions 1a and 2a are provided only on the outer peripheral surfaces of the first rotating roller 1 and the second rotating roller 2 in the embodiment, they also protrude on the outer peripheral surface of the third rotating roller 3 for performing high-pressure dehydration. Articles can be provided.

In this case, the protrusion of the first rotary roller 1 to be pressed first is made the highest and the third rotary roller 3 to be pressed last is applied.
The compression force acting on the raw material may be gradually increased by making the ridges of No. 1 to be the lowest. When dehydration is performed by using three rotating rollers as in the embodiment, the diameter of the first rotating roller 1 which compresses the raw material first is increased and the third rotating roller which pressurizes in the final stage is used. The diameter of 3 may be reduced.

(Effect of the Invention) The present invention can prevent the side compression of the raw material by preventing the rapid compression of the raw material without impairing the stability of the pair of filter cloth belts for sandwiching the raw material, so that the raw material contains a large amount of water. It is possible to efficiently dehydrate even sludge containing the same. Further, according to the present invention, since the rotary roller is provided with the ridge, the rotary roller and the filter cloth belt are in contact with each other by a line contact, which reduces the friction coefficient with the filter cloth belt. Therefore, the filter cloth belt becomes slippery, prevents damage to the belt, and does not require a strong driving force.

[Brief description of drawings]

FIG. 1 is a side view showing the structure of a belt press dehydrator according to the present invention, FIG. 2 is a side view showing a rotating roller and a filter cloth belt, FIG. 3 is a front view of the rotating roller, and FIG. It is a front view of the rotation roller which shows the modification of a strip. 1 ... 1st rotation roller, 1a, 1b ... ridge 2 ... 2nd rotation roller, 2a, 2b ... ridge 2 ... 3rd rotation roller 4a-4f ...... guide roller 5 ...... 1st filter cloth belt 6a-6e …… Auxiliary roller 7 …… Second filter cloth belt, 8 …… Raw material hopper 9a-9d …… Preload roller 10 …… Dewatering cake discharge port 11a, 11b …… Drained water Receiving, 12 ... Backup belt

Claims (1)

[Scope of utility model registration request] 1. A belt press dehydrator for sandwiching a raw material containing water between a pair of filter cloth belts capable of passing water, which are rotated along the peripheral surfaces of a plurality of rotating rollers, and performing pressure dehydration. A plurality of ridges are provided on the peripheral surface of the rotary roller, and the ridges are formed in a straight line parallel to the axial direction of the rotary roller or displaced forward or backward toward the axial end of the rotary roller. Belt press dewatering machine characterized in that.