JPS6232720Y2 - - Google Patents

Description

[Detailed description of the invention] This invention supplies the material to be treated in a storage tank between a pair of endless band-shaped filter cloths wound around a large number of idle rolls, and The present invention relates to a belt press type dehydrator configured to pressurize and dehydrate an object to be processed.

In the above-mentioned dehydrator, when the fluidity of the processed material is high due to changes in the properties of the processed material, the processed material protrudes from both ends of the filter cloth in the width direction due to the clamping pressure of both filter cloths, and solidifies. There were problems that reduced the recovery efficiency and sometimes led to inoperability.

Therefore, in order to deal with the occurrence of extrusion, it has conventionally been common practice to adjust the amount of coagulant added or adjust the tensioning force applied by tensioning rolls to each of the filter cloths. However, in the former case, because the point where the protrusion occurs and the point where the flocculant is added are far apart, the protrusion continues to occur until the processed material whose coagulation state has been adjusted is sent to the protrusion point, resulting in poor responsiveness. Unfortunately, it had the disadvantage of unnecessarily lowering the solid content recovery efficiency. On the other hand, in the latter case, as the tension of the filter cloth is weakened to prevent extrusion, the clamping pressure of both filter cloths decreases overall, and the moisture content of the dehydrated product increases, which The problem was that the dehydration itself was poor.

In view of the above-mentioned points, the present invention is designed to eliminate protrusion by making the clamping pressure at the terminal end of the clamping pressure part of both filter cloths as little as possible and with good responsiveness, thereby improving the properties of the processed material. The purpose is to enable dehydration treatment to be performed satisfactorily depending on each case.

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

The processed material supplied from the first storage tank 1 and the second
A mixer 3 is provided to coagulate and mix the flocculant supplied from the storage tank 2, and a gravity dewatering section 5 is attached to the endless belt-shaped first rotary filter cloth 4, and the direction of rotation of the gravity dewatering section 5 is On the lower side, there is a clamping pressure unit 7 that clamps the thickened sludge to perform forced dewatering in cooperation with the second rotary filter cloth 6.
With the rotation of the first and second rotating filter cloths 4 and 6, materials to be treated such as sludge generated in various water treatments such as human waste, urban sewage, and industrial wastewater are continuously collected. The belt press type dehydrator is configured to perform dehydration treatment.

The clamping pressure section 7 is composed of a compression dehydration zone A having a linear path, a compression dehydration zone B having a large diameter arcuate path formed by large diameter rolls 8, and a zigzag configuration in which rolls 9 are arranged side by side. A shear dewatering zone C is provided in which a path is formed, and the clamping pressure by the first and second filter cloths 4 and 6 is increased sequentially.

A brake 1 is attached to the rotating shaft 10 of each of the idle rolls 9 in the shear dewatering zone C.
1 is attached.

The brake 11 includes a brake drum 12 integrally attached to the rotating shaft 10 and a pair of brake shoes 1 that act on the brake drum 12.
3 and 13, both brake shoes 1
3 and 13 are interlocked and connected via an air cylinder 14.

Each of the air cylinders 14 and the compressor 15 is connected to an electromagnetically operated air pressure regulating valve 1.
It is connected via 6. A device 17 for detecting the solid content concentration of the material to be treated is provided in the first storage tank 1, and the detection results from the detection device 17 are sent to the arithmetic processing device 1 at set time intervals (for example, 30 seconds, 1 minute, etc.).
8, and based on the input results, a predetermined command signal is input to the operation section 19 of each of the air pressure regulating valves 16, and the arithmetic processing unit 18 is programmed in advance in a state corresponding to each solid content concentration. air cylinder 1 so that the applied pressure can be automatically obtained.
4. It is configured to adjust the air pressure for each air operation.

That is, when the solid content concentration is low, the load on the brakes 11 is increased so that the increase in filter cloth tension decreases from the upper side to the lower side in the filter cloth running direction, and the final Without reducing the pressure as much as possible,
The pressure applied by the intermediate roll 9 is applied to the filter cloths 4 and 6.
On the other hand, when the solid content concentration is high, the increase in filter cloth tension decreases from the upper side to the lower side in the filter cloth running direction. In this way, by increasing the load on the brakes 11... and increasing the overall pressure applied by the rolls 9... without changing the final pressure too much, the water content of the solids can be lowered better. We will make the necessary adjustments.

Also, compression dehydration zone B and shear dehydration zone C
A device 20 is provided at each predetermined location to detect protrusion of the processed material from both widthwise ends of the filter cloths 4 and 6,
The detection result by the protrusion detection device 20 is input to the arithmetic processing unit 18, and based on the protrusion state detection, when protrusion occurs in the shear dehydration zone C,
Priority is given to the detection result of the solid content concentration detection device 17, and only the load on the brake 11 at the end is increased beyond the setting, and when overflow occurs in the compression dehydration zone B, the brake on the upper side in the filter cloth traveling direction is increased. 1
As mentioned above, the load on the brakes 11 is appropriately adjusted to quickly eliminate the protrusion.

In order to adjust the load on the brakes 11, the mutual adjustment degree of the brakes 11 may be set appropriately.

The brake 11 may be provided on the large-diameter roll 8;
The brake 11 may be provided to a plurality of the rolls 8, 9, . . . .

Although the embodiments have been described above, the main features of the belt press type dehydrator of the present invention are as follows:
In a shearing water cutoff zone C in which the moving path of the filter cloths 4, 6 is configured in a zigzag shape, the pressure applied by both the filter cloths 4, 6 is adjusted to each of the plurality of idle rolls 9. Attach the brake 11 freely,
A device 17 for detecting the concentration of the processed material is provided in the storage tank 1, and a device 20 for detecting protrusion of the processed material from both ends of the filter cloths 4 and 6 in the width direction is provided in the shear dehydration zone C. an arithmetic processing unit 18 that controls the force applied to the brake 11 based on the detection result of the detection device 17, and controls the force applied to the brake 11 with priority given to the detection result of the protrusion detection device 20 when detecting the protrusion; The functions and effects are as follows.

That is, brakes 11 attached to a plurality of rolls 9, such as the roll 9 on the terminal end side and the roll 9 on the start end side or the middle roll 9, etc., in the shear dehydration zone C configured with a zigzag path are used in the storage tank 1. Since the operation is performed based on the concentration detection result of the material to be processed, it is possible to obtain a pressing force in advance according to the properties of the material to be processed, and efficient dehydration can be performed. Moreover, if the material to be processed protrudes from the filter cloth when the pressure is automatically controlled in this way, the pressure is adjusted with priority given to controlling the protrusion, so the protrusion can be quickly resolved and the protrusion can be prevented. A pressurizing force close to the maximum pressure can be obtained within the range where no pressure is generated. Therefore, the concentration detection device and the overflow detection device complement each other's shortcomings, and while performing efficient dehydration according to the properties of the processed material, overflow can be quickly resolved with good responsiveness, and the overall As a result, it has become possible to improve the recovery efficiency of solids and to sufficiently and favorably reduce the water content of the dehydrated material by suitably responding to each of the properties of the material to be treated.

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]

The drawings show an embodiment of the belt press type dehydrator according to the present invention, with FIG. 1 being a general longitudinal cross-sectional view of the whole, and FIG. 2 being an enlarged cross-sectional view of the main parts. 4, 6... filter cloth, 8, 9... roll, 11...
Brake, 17... Concentration detection device, 18... Arithmetic processing device, 20... Extrusion detection device, C... Shear dehydration zone.

Claims (1)

[Scope of utility model registration request] The material to be treated in the storage tank 1 is supplied between a pair of endless belt-shaped filter cloths 4, 6 wound around a large number of idle rolls 8, 9, etc.
In a belt press type dehydrator configured to pressurize and dehydrate the material to be processed between the zones, a shear dehydration zone C has a moving path of the filter cloths 4 and 6 in a zigzag shape.
A brake 11 is attached to each of the plurality of idle rolls 9 so that the pressure applied by the two filter cloths 4 and 6 can be freely adjusted, and the concentration of the material to be treated in the storage tank 1 is adjusted. A detection device 17 is provided, and a device 20 is provided in the shear dehydration zone C to detect protrusion of the processed material from both ends of the filter cloths 4 and 6 in the width direction. 11 and an arithmetic processing device 18 that controls the acting force of the brake 11 by giving priority to the detection result of the protrusion detection device 20 when detecting the protrusion. Dehydrator.