JPH0233480B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for continuously dewatering sludge generated in the treatment of water, sewage, industrial wastewater, and other water.

[Conventional technology]

A device in which an endless filter cloth belt is movably hung around a plurality of roll groups in a face-to-face polymerized state, and dewatering using a plurality of pressing rolls while squeezing sludge between these filter cloth belts is a device that can be used in various dewatering devices. In response to the trend toward energy saving, dehydration performance such as dehydration to obtain a dehydrated cake with a lower water content is required for this equipment, and various improvements have been made. For example, it is equipped with a shear dehydration section that includes a sun roll and a plurality of planetary rolls that remove and apply shearing force to the sun roll, and the number of times of shearing by these planetary rolls can be adjusted without being limited by the number of planetary rolls. A device with improved dewatering efficiency has been proposed in Japanese Utility Model Application Publication No. 12594/1983.

[Problem that the invention seeks to solve]

However, in the shear dewatering section proposed in the above-mentioned Japanese Utility Model Publication No. 61-12594, etc., the separated water flowing out from the filter cloth belt side that contacts the planet roll at the upper part of the sun roll is transferred to the lower part of the sun roll. When the filter cloth is held between the planetary roll and the sun roll until the filter cloth reaches 100, and the flow rate is large, the filter cloth and the liquid surface may come into contact with each other, resulting in a decrease in dewatering efficiency.

In addition, when the sludge is not properly refined, the sludge leaks from the filter cloth belt, but in that case it falls between the planetary roll and the sun roll, contaminates the planetary roll and the sun roll, and is self-cleaned only with separated water. In some cases, there were problems such as the amount of time required.

The present invention solves such conventional problems, and quickly drains the separated water flowing out from the filter cloth belt side in contact with the planetary roll from the sun roll, and
Even if side leakage of sludge occurs due to insufficient refining, the purpose is to provide a dewatering device that can quickly discharge sludge using separated water, prevent rolls from becoming dirty, and further improve dewatering efficiency. be.

[Means for solving problems]

In the present invention, an endless filter cloth belt is movably hung around a plurality of roll groups in a face-to-face superposed state, and while sludge is compressed between these filter cloth belts, shearing force is applied by a plurality of shear rolls. In a dehydration apparatus equipped with a shear dehydration section that performs shear dewatering, the shear dehydration section is formed from a sun roll and a planetary roll circumscribing the sun roll, support plates are provided at both ends of the planet roll, and a space between these support plates is provided. The planetary rolls are rotatably supported by connecting rods penetrating through the inside of the planetary rolls, and these support plates are rotatable relative to the sun rolls, and further, the ends of the sun rolls or their vicinity are supported from the central part. This dewatering device is characterized by having a small diameter groove formed in the circumferential direction.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of the present invention, in which sludge 1
The endless filter cloth belt 2 that receives the supply of sludge 1 and the endless filter cloth belt 3 that does not receive the supply of sludge 1 are connected to a drive device (not shown) and rotate at the same speed using a drive roll 4 and a group of 5 rolls. It is mounted so that it can travel in a face-to-face state. Further, the vicinity of the sludge supply section of the filter cloth belt 2 is a gravity dewatering section G provided with a large number of support rolls 6, and then the filter cloth belts 2 and 3 are superposed with the sludge 1 in between.

Furthermore, a shear dewatering section
After running, the cloth belts 2 and 3 are separated, and the dehydrated cake 7 is peeled off and falls onto the conveyor 8. In this case, in front of the shear dewatering section X, pressing rolls (not shown) may be arranged in parallel as appropriate.

In the figure, numeral 9 indicates a cleaning device for each of the filter cloth belts 2 and 3.

As shown in FIGS. 2 and 3, the structure of the shear dewatering section
is rotatably supported by the support plate 12, and the support plate 12
is rotatable relative to the sun roll 10, and the planetary roll 11 is rotatable around the sun roll 10 while rotating on its own axis. Although these shear dewatering sections X are provided at two locations in the illustrated example, they may be provided at one location.

In addition, when dewatering sludge, high pressure is applied to the shear dewatering section The roll 11 is supported by a support plate 1 as shown in the illustration.
2 are provided at both ends of the planetary roll 11, and the planetary roll 1
A connecting rod 13 for preventing twisting passes through the center of the connecting rod 1, and each end is removably fixed to the support plate 12 with a nut 14 or the like.

Furthermore, the diameter of both ends of the sun roll 10 or the vicinity thereof is made smaller than the diameter of the center part, and grooves 1 are formed in the circumferential direction.
5 is formed. This groove 15 can be formed between the large diameter part of the sun roll 10 and the support plate 12, with the end part of the sun roll 10 having a small diameter, for example, as shown in the illustrated example.

The sun roll 10 also has a rotating shaft 16 at the end.
A sprocket 17 is provided on this rotating shaft 16.
are connected to each other, and rotation is applied to the sun roll 10 by a variable speed motor or the like (not shown) through a chain 18, and the rotation direction can be rotated in forward or reverse directions, and the rotation speed is also variable.

Therefore, the planetary roll 11 is given rotation by the sun roll 10 circumscribing the filter cloth belts 2 and 3 hung thereon, and when a certain speed is set for the filter cloth belts 2 and 3, the rotation of the sun roll 10 is The rotation direction and rotation speed of the planetary roll 11 change depending on the direction and rotation speed. Therefore, by adjusting the rotation direction and rotation speed of the sun roll 10, the revolution of the planetary roll 11 can be adjusted as appropriate.

Furthermore, as shown in FIGS. 4 and 5, the sun roll 10
Even if the rotation of the planetary roll 11 is stopped and fixed, the revolution of the planetary roll 11 can be adjusted by the speed of the filter cloth belts 2 and 3.

The sludge 1 to be dewatered is supplied onto the running filter cloth belt 2, is transported while being gravity dehydrated in the gravity dewatering section G, is turned and polymerized face to face with the filter cloth belt 3, and the sludge 1 is transferred to both filter cloths. While being held between the belts 2 and 3, the belts run under tension as they reach the shear dewatering section X, and are sequentially subjected to shearing force from the planetary rolls 11. By adjusting the rotation of the sun roll 10, the number of times of shearing by the planetary roll 11 can be increased, allowing efficient dewatering.

At this time, since the groove 15 is provided in the circumferential direction at or near the end of the sun roll 10, the separated water of the sludge dehydrated by the planetary roll 11 is quickly drained through the groove 15, and the separated water is Separated water does not accumulate between the planetary roll 11 and the sun roll 10 and comes into contact with the filter cloth belts 2 and 3, increasing dewatering efficiency. Furthermore, even if sludge side leaks due to insufficient refining, the presence of the grooves 15 prevents it from being discharged together with the separated water and contaminating the planetary rolls 11, thereby preventing the rotation and revolution of the planetary rolls 11. It can be made smooth.

The dehydrated cake 7 thus dehydrated is peeled off, falls down, and is conveyed by a conveyor 8.

〔Effect of the invention〕

As described above, according to the present invention, the number of times of shearing in the shear dehydration section can be adjusted arbitrarily without being limited by the number of planetary rolls,
It is always possible to improve the dewatering efficiency depending on the properties of the sludge, and by providing grooves in the circumferential direction at or near the end of the sun roll, separated water and side leaked sludge can be quickly removed. This prevents the rolls from becoming dirty, and since the separated water is not held between the planetary roll and the sun roll, it does not come into contact with the filter cloth, further increasing the dewatering efficiency, and further improving the effects of double-sided filtration.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an explanatory diagram of the overall configuration, Fig. 2 is a cutaway front view of the shear dewatering section, Fig. 3 is a partially enlarged cross-sectional view of Fig. 2, and Fig. 4 is a diagram illustrating the overall configuration. A fixed explanatory diagram of the sun roll, FIG. 5 is a view taken along the - line in FIG. 4. DESCRIPTION OF SYMBOLS 1...Sludge, 2,3...Endless filter cloth belt, 4...Drive roll, 5...Roll, 6...Support roll, 7...Dewatered cake, 8...Conveyor, 9...Washing device, 10...
Sun roll, 11... Planet roll, 12... Support plate,
13...Connecting rod, 14...Nut, 15...Groove, 16...
Rotating shaft, 17... Sprocket, 18... Chain,
19...Pin, 20...Fixed support material, G...Gravity dehydration section, X...Shear dehydration section.

Claims (1)

[Claims] 1. An endless filter cloth belt is hung movably around a group of rolls in a face-to-face polymerized state, and the sludge is compressed between these filter cloth belts and shear force is applied by a plurality of shear rolls to perform shear dewatering. In a dehydration apparatus equipped with a shear dehydration section, the shear dehydration section is formed from a sun roll and a planet roll circumscribing the sun roll, support plates are provided at both ends of the planet roll, and the planet roll is installed between these support plates. The planetary rolls are rotatably supported by connecting rods penetrating through the inside, and these support plates are rotatable relative to the sun roll, and further, the ends of the sun roll or the vicinity thereof are formed into a circle with a smaller diameter than the center part. A dewatering device characterized by having grooves formed in the circumferential direction.