JPS5853197Y2 - Squeezing roller in roller press dewatering machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a squeezing roller in a roller press dehydrator.

Generally, when wastewater such as domestic wastewater or industrial wastewater is treated biologically or chemically, a slurry with a high moisture content is produced depending on the treatment method. is subjected to dehydration treatment.

Conventionally, a roller press dehydrator as shown in Fig. 1 is known as a device for dewatering such slurry. Furnace cloth support/driving rolls 3 and 4 and driven rolls 5 and 6 are stretched so as to face each other, and each of the driving rolls 3 and 4 is driven by a deceleration motor (not shown) or the like. The apparatus is configured to move each F cloth 1, 2 in the direction of arrow A by driving at appropriate speeds in synchronization with each other.

Then, at a location where each furnace cloth 1, 2 faces between each of the driving rolls 3, 4 and the corresponding driven rolls 5, 6,
A plurality of rollers 7a, 7b, and 7c are provided to perform a dewatering action, and these rollers 7a, 7b, and 7c bend and tension the pair of upper and lower furnace cloths 1. Due to the tension, the slurry between the furnace cloths 1 and 2 IJ -
A is compressed to perform dehydration.

However, the roller 7ay7b configured as described above
, 7c, when trying to increase the dehydration pressure of the furnace cloths 1 and 2, the surface pressure P applied to the slurry A sandwiched between the furnace cloths 1 and 2
(kg/cyst) needs to be increased.

The above surface pressure P,! :, Tension T of F fabrics 1 and 2 (kg/cII
There is a relationship of P=T/r between the radius r (cIrL) of the rollers 7a, 7b, and 7c.

Therefore, in order to increase P, either increase T or
It is necessary to reduce r.

If the tension T of the furnace cloths 1 and 2 is increased, the life of the furnace cloths will be shortened, leading to an increase in dewatering costs.

Furthermore, if the diameters of the rollers 7a, 7b, and 7C are made smaller, the cloth supporting force, which is one of the functions of the press rollers, will be reduced, causing the rollers to bend, which will cause wrinkles in the furnace cloth. Become.

Therefore, such a roller press dewatering machine has the disadvantage that it is not possible to obtain a good dewatering effect.

This invention was made in view of the above circumstances, and its purpose is to provide a roller that can squeeze the furnace cloth with a small roller, and that can also strongly tension the furnace cloth and obtain a good dewatering effect. An object of the present invention is to provide a squeezing roller in a press dewatering machine.

Hereinafter, one embodiment of this invention will be described in detail based on FIGS. 2 and 3.

Note that the same reference numerals in the figure as in FIG. 1 indicate the same constituent elements, so the explanation thereof will be omitted.

In FIG. 2, between each drive roll 3, 4 and the corresponding driven roll 5, 6, and at the location where the pair of upper and lower oven cloths 1, 2 face each other, there is one guide roller 10 and Corresponding pressing rollers 11 and 12 are provided, and the furnace cloths 1 and 2 are brought into pressure contact with each other by the guide roller 10 and guided between the pressing rollers 11 and 12.

As shown in FIG. 3, the squeezing rollers 11 and 12 include five small rollers 11 around opposing rollers lla and 12a.
b..., 12b... are provided at equal intervals, and the small roller 11b of one squeeze roller 11,
One of the small rollers 12b of the other pressing roller 12 is located between the rollers 11b, and these form a kind of gear mechanism.

Furnace cloths 1 and 2 are inserted between each of the small rollers 11b, 12b, and 11b, and these furnace cloths 1 and 2 are bent into a substantially inverted W shape and compressed.

In addition, numeral 13 in the figure is a hopper that continuously supplies an appropriate amount of the slurry IJ-A onto the lower furnace cloth 2.

Next, the operation of the embodiment configured as described above will be explained.

First, the p cloth supporting and driving rolls 3.4 are driven in the direction of the arrow A in synchronization with each other by a drive device of a deceleration motor (not shown), and each oven cloth 1.2 is moved in the direction of the arrow A.

Next, the hopper 1 is placed above the furnace cloth 2 that moves as described above.
From No. 3 onwards, continuously feed the slug IJ-A in appropriate amounts.

The slurry A thus supplied is transported in the direction of the arrow A, and is squeezed between the furnace cloths 1 and 2 by the guide roller 10.
Next, in this state, the furnace cloths 1 and 2 are guided between the pressing rollers 11 and 12, and each of the pressing rollers 11 and 12 is connected to the small roller 11.
b..., 12''b... constitute a kind of gear mechanism, so first the small roller 11b of the squeezing roller 11 bends and squeezes the furnace cloths 1 and 2, and then the squeezing roller 1
The oven cloths 1 and 2 are bent and squeezed by the second small roller 12b in the opposite direction to the above, and further bent and squeezed by the other small roller 11b of the squeezing roller 11. In this way, the oven cloth 1
, 2 are compressed by being bent in a substantially inverted W-shape between the respective pressing rollers 11 and 12, so that the dewatering efficiency of the slurry IJ-A is improved.

Further, the slurry A dehydrated as described above is conveyed as a cake B in the direction of arrow A by oven cloths 1 and 2.

In such pressing rollers, the rollers that come into pressure contact with the oven cloths 1, 2 are the small rollers 11b...12b..., so their radius is small, so the tension of the oven cloths 1.2 cannot be increased. Naturally, the surface pressure P applied to the slurry IJ-A sandwiched between the furnace cloths 1 and 2 increases, and the dewatering efficiency improves.

Moreover, since each of the small rollers 11b, 12b, .

For example, if the width of the furnace cloths 1 and 2 is 30001L1 and the tension of the furnace cloths 1 and 2 is 10 kg/cm, the diameter of the conventional pressing roller can only be reduced by about 200 to 250 degrees, and the surface pressure P The limit is 1 to 0.8 ky/c/L.

On the other hand, in this pressing roller, small rollers 11b...12b
If a radius of 1001 m is used for ..., the surface pressure will be 2 and 9/cIi under the same conditions.

When sewage sludge was dewatered using a conventional pressing roller having the above dimensions, the moisture content of the cake was 77 to 78 yen, but with this pressing roller, it was 75 to 76 yen.

Furthermore, when the slurry containing a lot of fiber was dehydrated, the water content was 57 to 60% in the conventional slurry, whereas it was 60 to 65 in the conventional slurry.

In the above embodiment, the small roller 12b of the other pressing roller 12 is simply located between the small rollers 11b 211b of one pressing roller 11, but the present invention is not limited to this, for example. As shown in FIG. 4, a braking force is applied to the roller 15a of one pressing roller 15, and the small roller 15b of this pressing roller 15 and the small roller 14b of the other pressing roller 14 press the furnace cloths 1 and 2. It is also possible to configure such a configuration.

Although only a pair of squeezing rollers are shown in this figure, a plurality of squeezing rollers are also naturally included in the present utility model.

As explained in detail above, according to this invention, by providing a plurality of small rollers at equal intervals around the opposing rollers, which mesh with each other and rotate each of the rollers, the diameter of the rollers can be increased. The strength of the furnace cloth against tension can be increased, and since the furnace cloth is squeezed with small rollers, the dewatering pressure can be increased, and the slurry can therefore be efficiently dehydrated.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing a conventional roller press dewatering machine.
FIG. 2 is a schematic configuration diagram of a roller press dewatering machine according to this invention, FIG. 3 is a side view showing its pressing roller, and FIG. 4 is a side view showing another pressing roller. 1.2...Bed supporting and driving roll, 5 (P cloth), 3, 4... Furnace support, 6... Driven roll, 11°12. 14.15... Pressing roller, 11a,
12a. 14a, 15a--roller, 11b, 12b
. 14b, 1sb...Small roller, A...
slurry.

Claims (1)

[Scope of utility model registration request] In a roller press dehydrator that transports slurry between a pair of belts and squeezes the water from the slurry with opposing rollers, the rollers mesh with each other around the opposing rollers. A squeezing roller in a roller press dehydrator, characterized in that a plurality of small rollers to be rotated are provided at equal intervals.