JPS6027596Y2 - Dehydration equipment - Google Patents

Description

[Detailed description of the invention] The present invention provides an endless band-shaped filter cloth that rotates from a gravity dewatering section to a forced dewatering section, and a device that supplies a material to be treated to the gravity dewatering section. The present invention relates to a dewatering device provided with a cake thickness adjustment roll for making the thickness of the cake sent out from the dewatering section on the filter cloth constant in the width direction of the filter cloth.

Conventionally, the cake thickness adjusting roll in the above device is generally configured to have an approximately equal diameter over its entire length in the axial direction.
This is intended to suppress variations in the thickness of the cake conveyed from the gravity dewatering section on the filter cloth due to changes in properties such as changes in solid content concentration of the material to be treated supplied to the gravity dewatering section.

However, when the properties of the treated material change, there are cases where the fluidity is high and fluidity is low, and even if the thickness is made uniform, in the former case, the width of the filter cloth changes as the material is processed in the forced dewatering section. There was a drawback that the solid content protruded from both ends, reducing the solid content recovery efficiency.

In view of the above points, the present invention aims to improve the recovery of solids by fully utilizing the area of the filter cloth while preventing it from protruding from both ends in the width direction, regardless of changes in the fluidity of the material to be treated. The purpose is to enable dehydration treatment to be performed at a large scale and with significant work efficiency.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

The material to be treated is supplied from the first storage tank 1 and the second storage tank 2
A mixer 3 is provided to coagulate and mix the flocculant supplied from the
A gravity dewatering section 7 is formed between the endless strip-shaped first rotary filter cloth 4-, the case side wall 5, and the partition wall 6, which supplies the agglomerated product from the mixer 3 and filters water by gravity. At the same time, a first
A cake thickness adjusting roll 8 is provided as an example of an adjusting device for adjusting the thickness of the cake fed out on the rotary filter cloth 4, and a cake thickness adjusting roll 8 is provided on the lower side thereof between the cake thickness adjusting roll 8 and the first rotary filter cloth 4. , a second rotary filter cloth 9 that pinches the cake whose thickness has been adjusted
A forced dewatering section 10 consisting of a light pressure dewatering zone A having a linear path, a compression dehydrating zone B having a large-diameter arcuate path, and a shear dehydrating zone C having a meandering path is formed. As the cloth 4 rotates from the gravity dewatering section 7 to the forced dewatering section 10, it is possible to continuously dehydrate materials such as sludge generated in various water treatments such as human waste, urban sewage, and industrial wastewater. The dehydrator is configured as follows.

The adjustment roll 8 has cake thickness adjustment members 11 located at both ends thereof and corresponding to both ends of the filter cloth 4 in the width direction.
11 is installed.

The cake thickness adjusting members 11 and 11 are respectively fitted onto the roll 8 so as to be slidable in the axial direction thereof, and are attached to the roll 8 so as to be able to adjust the fixed position thereof, and have a diameter larger than that of the roll 8. The tapered surface portion F2 has a diameter larger than that of the roll 8 and becomes smaller toward the widthwise side of the filter cloth 4, and the thickness of the cake carried on the filter cloth 4 is is made smaller at both ends of the filter cloth 4 in the width direction than at the center, and the length of the thinner portion in the width direction of the filter cloth 4 can be adjusted as appropriate.

The distance between the lower peripheral surface of the roll 8 and the filter cloth 4 is usually 10
~40mm.

In the figure, reference numeral 13 denotes a receiving member for preventing the processed material from protruding from both ends of the filter cloth 4 in the width direction due to the action of the roll 8, and is located inside the filter cloth 4 in the width direction of the large diameter curved portion F1. The cake thickness adjusting member 11 can be displaced to a position where the side end portion approaches the receiving member 13.

As shown in FIG. 3, the cake thickness adjusting member 11 may not include the tapered surface portion F2, and in order to adjust the fixing position of the cake thickness adjusting member 11, as shown in FIG. An adjustment bolt 14 is provided along the longitudinal direction of the roll 8 so that it can only rotate freely, and the adjustment bolt 14 is screwed into the cake thickness adjustment member 11, and the cake thickness adjustment member 11 is pushed as the port 14 rotates. It may be configured to be operated by pulling.

In addition, the first and second storage tanks 1 and 2 and the mixer 3
Instead, various supply means can be employed, and these are collectively referred to as the processing object supply device 15.

In summary, the present invention provides a dehydration device that has been officially registered.
Cake thickness adjusting members 11.11 are installed on the roll 8 to adjust the thickness of the cake on the filter cloth 4 so that the thickness of the cake on the filter cloth 4 is smaller than that on the center side. The fixed position can be freely adjusted in the width direction.

In other words, when the material to be treated has high fluidity, the cake thickness adjustment members 11. Even if the processed material flows from the center in the width direction of the filter cloth 4 to both ends of the filter cloth 4 during processing in the forced dewatering section 10, the fluidized material is removed from the filter cloth 4. The dehydration treatment is performed while the filter cloth 4 is positioned within the width of the filter cloth 4 without reaching the ends in the width direction.On the other hand, if the fluidity is low,
The cake thickness adjusting member 11.11 is located near both ends of the filter cloth 4 in the width direction or in a place where it hardly acts, and the cake thickness adjustment member 11.11 is placed in a sufficiently wide area for a unit time without causing the object to be processed to protrude from both ends of the filter cloth 4 in the width direction. Maximize the amount of processing per unit,
Overall, regardless of the fluidity of the processed material,
It is now possible to perform dewatering treatment with high work efficiency while preventing the objects to be treated from protruding from the filter cloth 4 and improving the solid content recovery efficiency in a state corresponding to each condition.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the dehydration device according to the present invention.
The figure is a schematic vertical sectional view of the whole, FIG. 2 is a sectional view taken along lines 1 to 2 in FIG. 1, and FIGS. 3 and 4 are sectional views of main parts showing modified examples, respectively. 4...Filter cloth, 7...Gravity dewatering section, 8.
... Cake thickness adjustment roll, 10 ... Forced dewatering section, 11 ... Cake thickness adjustment member, 15 ...
...Processed material supply device.

Claims (1)

[Scope of utility model registration request] The endless belt-shaped filter cloth 4 is transferred from the gravity dehydration section 7 to the forced dehydration section 10.
A device 15 is provided which rotates over the entire length of the filter, and is provided with a device 15 for supplying the material to be processed to the gravity dewatering section 7, so that the thickness of the cake sent out from the gravity dewatering section 7 on the filter cloth 4 is constant in the width direction of the filter cloth. This is a dewatering device equipped with cake thickness adjustment rolls 8 for making the cake thickness on the filter cloth 4 smaller than that on the center side by placing them at respective widthwise ends of the filter cloth 4. A dewatering device characterized in that a cake thickness adjusting member 11.11 is attached to the roll 8 in a fixed position adjustable in the width direction of the filter cloth 4.