JPS6320166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a dehydration system in which an endless band-shaped filter cloth is provided in a rotating state from a gravity dehydration section to a forced dehydration section, and a device is provided for supplying a material to be processed to the gravity dehydration section. Regarding equipment.

The above device has the disadvantage that wrinkles occur in the filter cloth due to processing in the forced dewatering section, and the filter cloth is easily damaged.The present invention aims to investigate the cause of wrinkles and prevent the occurrence of wrinkles in the filter cloth. The purpose is to make it preventable.

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

A storage tank 1 that supplies and stores materials to be treated such as sludge,
A flocculation system is formed by connecting a pipe R ₁ with a pump 2 and a pipe R 2 to a coagulant storage tank 4 and a pipe R ₂ with a variable capacity pump 5. A agent mixing device 6 is provided, and the material to be treated and the flocculant from both devices 3 and 6 are supplied to a rotary mixer 7 for agglomeration and mixing, and the agglomerated mixture is supplied to a belt press type dehydrator 8. The dewatering device is designed to be incorporated into various water treatment systems for human waste, urban sewage, industrial wastewater, etc., and to dehydrate materials to be treated such as sludge generated therein.

The belt press type dehydrator 8 is provided with an endless belt-shaped first rotary filter cloth 9, and supplies the material to be processed from the mixer 7 between the first rotary filter cloth 9 and the case side wall and partition wall 10. A gravity dehydration section 11 is formed to filter water by gravity, and the thickness of the cake fed out on the first rotating filter cloth 9 is adjusted on the downstream side of the gravity dehydration section 11 in the rotational direction of the filter cloth. A cake thickness adjusting roll 12 is provided as an example of an adjusting device for adjusting the thickness of the cake, and a second rotary filter cloth 13 is provided on the lower side of the roll 12 to clamp the cake whose thickness has been adjusted between it and the first rotary filter cloth 9. , a forced dewatering section 14 consisting of a constrictive dewatering zone A having a linear path, a compressive dehydrating zone B having a large diameter arcuate path, and a shear dehydrating zone C having a meandering path is formed, and the gravity dewatering section 11 of the first filter cloth 9 is formed. The structure is such that the object to be treated is dehydrated as it rotates from the to the forced dewatering section 14.

In the middle of the rotation of the first filter cloth 9 from the end of the forced dewatering section 14 to the beginning of the gravity dewatering section 11,
A filter cloth cleaning device 15 that acts on each of the front and back sides of the filter cloth,
On the other hand, a filter cloth cleaning device 16 is provided in the middle of rotation of the second filter cloth 13 below the shear dewatering zone C, and both filter cloths 9 and 13 are cleaned by the device 1.
The structure is such that backwashing is performed by jetting and supplying cleaning water through nozzles 17 of each of 5, 15, 16.

At the lower side of the cake thickness adjuster 12, a first
Sensors S are arranged in parallel at a predetermined interval in the width direction of the filter cloth 9 so as to be able to be displaced individually upon contact with the cake placed on the first filter cloth 9, and the signals from the sensors S are determined. A detection device 19 is configured to detect the difference in thickness of the cake placed on the first filter cloth 9 in the width direction of the filter cloth based on the input to the circuit 18 and the comparison with the maximum displacement amount.

A pressing force is forcibly applied while vibrating to the cake placed on the first filter cloth 9 at a location on the downstream side of the detection device 19 and on the upstream side of the supply section to the forced dewatering section 14. , a roller 20 that equalizes the thickness of the cake in the width direction of the filter cloth is provided so as to be switchable between an active position and a non-active position, and the detection device 19 makes a determination based on the detection of a difference in thickness that is equal to or greater than a first set value. The switching mechanism 21 is actuated by inputting a command signal from the circuit 18 to automatically switch the roller 20 to the operating position.

Further, based on the detection by the detection device 19 of a difference in thickness equal to or greater than a second set value that is larger than the first set value, a command signal is input from the determination circuit 18 to close the power supply circuit 23 in which the alarm device 22 is interposed. With,
The drive stop mechanism 24 for the motor M that drives and rotates the first and second filter cloths 9, 13 is activated, and the first
And the rotation of the second filter cloths 9, 13 is automatically stopped.

In the above embodiment, the roller 20 for reducing the difference in cake thickness, the alarm device 22, and the stop mechanism 24 for automatically stopping the rotation of the filter cloths 9 and 13 are provided. The difference in thickness is eliminated by the roller 20, but if a difference in thickness occurs that cannot be eliminated by the roller 20, the rotation of the filter cloths 9 and 13 is automatically stopped and the difference is corrected. Although the operator is notified by an alarm, it is sufficient to provide only one of the roller 20, the alarm device 22, and the stop mechanism 24, and these are collectively referred to as safety mechanisms 20, 22, and 24.

Further, in order to prevent a continuous difference in the thickness of the cake on the filter cloth 9 in the filter cloth width direction, the inclination of the cake thickness adjusting roller 12 may be changed.

In summary, the present invention provides the above-mentioned dewatering apparatus, in which the cake placed on the filter cloth 9 between the terminal end of the gravity dehydrating section 11 and the starting end of the forced dehydrating section 14 is removed. A device 19 for detecting a thickness difference in the width direction is provided, and safety mechanisms 20, 22, and 24 are provided that automatically operate based on the detection of a thickness difference greater than a set value by the detection device 19. shall be.

In other words, as a result of research, it was discovered that the cause of wrinkles in the filter cloth 9 is that the cake is placed on the filter cloth 9 and sent to the forced dehydration section 14 with a difference in thickness in the width direction of the filter cloth, and based on this knowledge, Based on this, as described above, safety mechanisms 20, 22, and 24 are installed to issue an alarm, stop the rotation of the filter cloth 9, or correct the thickness difference using the roller 20 when the thickness difference is detected. Preventing the occurrence of wrinkles on the cloth 9,
Also, damage to the filter cloth 9 caused by wrinkles can be eliminated,
The life of the filter cloth 9 can now be extended.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the dehydration device according to the present invention,
FIG. 1 is an overall schematic vertical sectional view, and FIG. 2 is a front view showing the detection device. 3... Processing material supply device, 9... Filter cloth, 11...
... Gravity dehydration section, 14 ... Forced dehydration section, 19 ... Detection device, 20 ... Roller, 22 ... Alarm device, 2
4... Stop mechanism, 20, 22, 24... Safety mechanism.

Claims (1)

[Scope of Claims] 1. An endless band-shaped filter cloth 9 is provided in a rotating state from a gravity dehydration section 11 to a forced dehydration section 14, and a device 3 is provided for supplying the material to be treated to the gravity dehydration section 11. The dewatering device detects a difference in thickness in the width direction of the filter cloth 9 of a cake placed on the filter cloth 9 between the terminal end of the gravity dewatering section 11 and the starting end of the forced dehydration section 14. safety mechanisms 20, 22, 2 that automatically operate based on the detection of a thickness difference greater than a set value by the detection device 19;
A dehydrating device characterized by being equipped with 4. 2 The safety mechanisms 20, 22, 24 are alarm devices 2
2. The dewatering device according to claim 1, characterized in that: 3 The safety mechanisms 20, 22, 24 are connected to the filter cloth 9.
2. The dewatering device according to claim 1, further comprising a mechanism 24 for automatically stopping the rotation of the dewatering device. 4. The dewatering device according to claim 1, wherein the safety mechanisms 20, 22, and 24 are rollers 20 that act to press the filter cloth 9 in order to equalize the thickness of the cake in the width direction. Device.