JPS6321996Y2 - - 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 an improvement in a cake thickness adjusting section of a dewatering device, in which a cake thickness adjusting device is attached to be able to move up and down, adjusting the thickness of the cake sent out from the gravity dewatering section by rotating the filter cloth.

Conventionally, as shown in FIG.
2 is biased downward by a spring 18, and the vertical position of the cake thickness adjuster 12 is changed in accordance with the change in the pushing force of the cake _S1 itself as the filter cloth 6 rotates, or as shown in FIG. As shown in FIG. 2, a method was proposed in which the amount of supply from the supply device 3 to the gravity dewatering section A is adjusted by a sensor 19 and a controller 20 as the cake thickness adjuster 12 changes in the vertical position.

However, in the case shown in FIG. 3, if the cake _S1 is relatively soft, even if it accumulates on the upper side of the cake thickness adjuster 12, the cake thickness adjuster 12 cannot be pushed up much, so the amount of accumulation increases. Therefore, there is a risk that the cake S ₁ will go over the cake thickness adjuster 12.
There was room for improvement so that the cake thickness adjustment function was not lost. In addition, although the cake thickness adjustment function shown in FIG. 4 is sufficient, there is a risk that the filtration function in the gravity dewatering section A will be impaired due to changes in the thickness of the cake _S1 due to changes in the supply amount. There was room for improvement in terms of dehydration performance.

In view of the above-mentioned circumstances, the purpose of the present invention is to ensure that good cake thickness adjustment can be performed without adversely affecting gravity dewatering performance and regardless of whether the cake is hard or soft.

The characteristic configuration of the cake thickness adjusting section of the dewatering device according to the present invention is that it includes a cake thickness adjusting tool that can be raised and lowered to adjust the thickness of the cake sent from the gravity dewatering section to the forced dewatering section by rotating the endless band-shaped filter cloth. A cake thickness detection sensor is installed near the upper side, and a controller is installed to automatically operate the lifting device of the cake thickness adjuster to maintain the thickness detected by the sensor within the set range. The effects are as follows.

In other words, when the sensor detects that too much cake has accumulated on the upper side of the cake thickness adjuster due to the action of the controller and the lifting device, the gap between the cake thickness adjuster and the filter cloth increases, increasing the amount of cake delivered. This reliably prevents the cake from going over the cake thickness adjuster. Conversely, if the sensor detects that the amount of cake accumulated on the upper side of the cake thickness adjuster has become too small, the gap between the cake thickness adjuster and the filter cloth is reduced to reduce the amount of cake delivered. This adjustment prevents an abnormal decrease in the amount of cake accumulated in the gravity dewatering section. As a result, the amount of cake accumulated in the gravity dewatering section does not fluctuate extremely, and gravity dewatering can be reliably performed in a good filtration state without changing the amount of material to be processed to be supplied to the gravity dewatering section. became possible. In addition, since the cake thickness adjuster is raised and lowered by the driving force of the lifting device, it is possible to ensure good cake thickness adjustment regardless of the hardness or softness of the cake, and it is possible to provide extremely excellent dewatering performance as a whole. It became.

Next, an example will be shown with reference to FIGS. 1 and 2.

As shown in FIG. 1, a rotary mixer 3 is provided to mix the material to be treated supplied from the first storage tank 1 and the flocculant supplied from the second storage tank 2, and a side wall 4 and a rear wall 5 are provided. An endless belt-shaped first rotary filter cloth 6, which forms a gravity dewatering section A for the processed material from the mixer 3 in cooperation with the first rotary filter cloth 6, is provided to be freely rotatable. An endless section forming forced high water sections B, C, and D having a constrictive dewatering zone B that gradually compresses the cake, a compressive dewatering zone C consisting of a reversing path, and a shear dehydrating zone D consisting of a meandering path. A belt-shaped second rotary filter cloth 7 is provided so as to be freely rotatable.
The materials to be treated, such as sludge generated in various water treatments such as human waste, urban sewage, and industrial wastewater, are transferred from gravity dewatering section A to forced dewatering sections B, C, and D together with the first rotating filter cloth 6. A dewatering device is configured to send the cake to a conveyor 9, continuously dewater the cake, and collect the dehydrated cake onto a conveyor 9 using a scraper 8. In addition, 10
A and 10b are containers for collecting waste water obtained in the dehydration process, and 10c is a container for collecting the filter cloth 6 washing water from the nozzle 11.

As shown in FIG. 2, a roller 12 that adjusts the thickness of the cake S sent from the gravity dehydration section A to the forced dehydration sections B, C, and D is provided so that it can be raised and lowered by a fluid pressure cylinder 13, and a pair of long and short contacts are provided. A first sensor 14 having detection elements 14a, 14a,
The first sensor 14 is provided near the upper side of the roller 12.
The fluid pressure cylinder 13 is provided with a first controller 15 that automatically expands and contracts based on the information from the cylinder 13, so that when the cake _S1 comes into contact with the short element 14b, the roller 12 is raised and the cake S is removed from the long element 14a. ₁ is moved away, the roller 12 is lowered so that the thickness of the cake S ₁ immediately before the roller 12 is maintained within a set range of D ₁ to D ₂ .

A second sensor 16 having a pair of long and short contact detection elements 16a and 16b is provided at a position higher than the first sensor 14 and not affected by the cake accumulation caused by the roller 12, and detects the contact detection based on information from the second sensor 16. A second controller 1 that automatically operates the processing material supply amount control valve V ₁ and the flocculant supply amount control valve V ₂
7 is provided so that when the cake S ₂ comes into contact with the short element 16b, the supply amount of the material to be treated and the flocculant is directly proportionally reduced, and when the cake S ₂ is separated from the long element 16a, the amount of the material to be treated and the flocculant is reduced. The feed rate is increased in direct proportion to maintain a cake thickness between D ₃ and D ₄ at which gravity dewatering is good.

Next, another example will be shown.

The dehydration form of the forced dehydration sections B, C, and D can be freely changed, such as one type or a suitable combination of multiple types.

Various types or configurations can be used to supply the material to be processed to the gravity dewatering section A, and these are collectively referred to as a device 3 for supplying the material to be processed.

To adjust the thickness of the cake S delivered from the gravity dewatering section A, various members such as an inclined plate or a rubber plate can be used, and these are collectively referred to as the cake thickness adjuster 12. The mechanism for driving and lowering the lift can be changed in various ways, such as a hydraulic type, an electric type, a mechanical type, etc., and these are collectively referred to as the lifting device 13.

The detection method and configuration of the first and second sensors 14 and 16 can be changed to various methods, such as a light or ultrasonic projection method.

A method in which the cake thickness adjuster 12 is raised or lowered by the controller 15 is, for example, by setting an appropriate sampling time, and when the detected cake thickness value deviates from the set range, the cake thickness adjuster 12 is raised or lowered by a set distance. Various methods can be used, such as a method in which the cake thickness adjuster 12 is raised and lowered by a distance corresponding to the amount that the cake thickness detection value deviates from the set range.

The object of dehydration treatment and the purpose of treatment may be any.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged view of the main part of FIG. Third
FIG. 4 and FIG. 4 are diagrams showing main parts of different conventional examples. 3... Processing material supply device, 6... Filter cloth, 12
...Cake thickness adjuster, 13... Lifting device, 14...
...Sensor, 15...Controller, A...Gravity dehydration section, B, C, D...Forced dehydration section, S...Cake.

Claims (1)

[Scope of utility model registration request] An endless belt-shaped filter cloth 6 is provided in a rotating state from the gravity dehydration section A to the forced dehydration sections B, C, and D,
A device 3 for supplying the processed material to the gravity dewatering section A is provided, and the rotation of the filter cloth 6 causes the gravity dewatering section A to
In a dewatering apparatus in which a cake thickness adjusting tool 12 is installed to be able to move up and down to adjust the thickness of the cake S sent out, a cake thickness detection sensor 14 is provided near the upper side of the cake thickness adjusting tool 12, and the sensor 14 is used to detect the cake thickness. A cake thickness adjusting section of a dewatering apparatus, which is provided with a controller 15 that automatically operates the lifting device 13 of the cake thickness adjusting tool 12 so as to maintain the detected thickness within a set range.