JPS6145987Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a belt press dewatering machine (hereinafter abbreviated as belt press) that separates solid liquid from a raw solution containing solid content and dehydrates wastewater such as sludge. Regarding.

A belt press usually consists of three elements: a coagulation reaction stirring section, a gravity dehydration section, and a compression dehydration section, or variations thereof.

The schematic structure of a conventional belt press is shown in FIG. In FIG. 1, the sludge supplied to the sludge hopper 1 rides on the upper surface of the lower cloth 2b, and first in the gravity dewatering section, most of the water in the sludge passes through the lower cloth 2b and is discharged into the drain tray 8. Furthermore, in the wedge dewatering section, the sludge on the lower cloth 2b is sandwiched between the upper cloth 2a and water is gradually removed through the lower cloth 2b into the drain tray 8. When the sludge further passes through several rolls 5 arranged in a staggered manner, the cloth 2a,
The tension of the sludge 2b and the curvature of the roll 5 are transferred to induce a squeezing force to remove moisture in the sludge through the lower cloth 2b and into the drain tray 8. The dewatered sludge is peeled off from the upper and lower cloths 2a and 2b by upper and lower scrapers 9a and 9b provided in the drainage section and transferred to the cake conveyor 10.
is discharged.

However, in the gravity dewatering section of a conventional belt press, as shown in FIGS. 2 to 5, the solids (SS) in the sludge form flocs 11, and the separated water 12 is passed through the lower cloth 2b. 12a. At this time, the separated water 12b in the lower part of the sludge (relative to its thickness) easily passes through the cloth 2b, but the separated water 12c in the upper part becomes difficult to pass through the sludge layer because the lower floc 11a becomes an obstacle.
Furthermore, since the flocs themselves settle to the bottom of the sludge due to gravity, it becomes even more difficult to remove the separated water 12, which not only reduces the functionality of the gravity dewatering section, but also causes a decline in the functionality of the belt press itself. There is.

The present invention includes an upper cloth stretched between a plurality of upper rolls and rolls arranged in a staggered manner, a lower cloth stretched between a plurality of lower rolls and the staggered rolls, and a cloth stretched between a plurality of lower rolls and the rolls arranged in a staggered manner. a driving source that drives the
In the gravity dewatering section of the belt press dewatering machine, which includes a sludge supply hopper that supplies sludge onto the lower cloth, a partition wall is provided on the lower cloth and has a height for storing the sludge and the separated water present thereon. a sludge supply hopper having a sludge supply hopper; and a hollow rotating roll having a water-absorbing material with good water absorption property on its surface, penetrating both widthwise walls of the sludge supply hopper in a watertight manner, and disposed so as to be in contact with the sludge surface on the lower cloth. , a rotating roll drive source that rotates the hollow rotating roll in a direction opposite to the transport direction of the sludge, and a rotating roll drive source that discharges water absorbed by the water absorbing material of the hollow rotating roll to the outside of the system through the hollow part of the hollow rotating roll. The purpose is to eliminate the above-mentioned drawbacks of the conventional belt press, reduce the gravity dewatering section of the belt press, and improve the dewatering performance of the belt press. It provides an auxiliary dewatering device for belt presses that can measure

Hereinafter, a preferred embodiment of the present invention will be described based on the embodiment shown in FIGS. 6 and 7.

In FIG. 1, FIG. 6, and FIG. 7, a plurality of upper rolls, that is, an upper guide roll 3a, an upper wedge dewatering roll 4a, an upper peeling roll 6a, an upper tension roll 7a, and rolls that are arranged in a staggered manner are shown. The upper cloth 2a stretched over the dewatering roll 5, a plurality of lower rolls, that is, the lower guide roll 3b, the lower wedge dewatering roll 4b, the lower peeling roll 6b, the lower tension roll 7b, and the pressing roll which is the staggered arrangement roll. a lower cloth 2b stretched over the dewatering roll 5; a drive source 13 for driving the cloths 2a and 2b; In the gravity dewatering section of the belt press, which consists of a sludge supply hopper having a partition wall with a height for storing separated water, a water absorbing material 15 with good water absorption is used.
a hollow rotary roll 18 having on its surface penetrating both walls 1a, 1b in the width direction of the sludge supply hopper 1 in a watertight manner 16, 17 and disposed so as to be in contact with the surface of the sludge 14 on the lower cloth 2b; A rotating roll drive source 11 rotates the hollow rotating roll 18 in a direction opposite to the conveying direction of the sludge 14 (arrow A in FIG. 1), and a rotating roll driving source 11 rotates the hollow rotating roll 18 in a direction opposite to the transport direction of the sludge 14 (arrow A in FIG. Dehydration discharge means 20 that discharges water out of the system through the hollow part 19 of the roll 18
It is composed of.

Furthermore, to explain this embodiment in detail, there are two bearings at both ends.
1, and a cloth fixing ring 25 and several reinforcing rings 2 are connected via several stays 24 to a shaft 23 having a driving sprocket 22 or a pulley.
Fix 6 and make into a roll. The length up to the cloth fixing rings 25 on both sides is greater than the width of the sludge hopper 1. A material 15 having a suitable mesh such as wire mesh or cloth is stretched around the outer periphery of the roll 18 via cloth fixing rings 25 on both sides. A circular hole 27 is made in both side walls 1a, 1a of the sludge hopper 1, and the rotating roll 18 is passed through it. In order to prevent the sludge 14 supplied to the sludge hopper 1 from flowing out through the gap between the rotary roll 18 and the holes 27 made in both side walls 1a, 1a of the sludge hopper 1, the sealing material 16 that contacts the cloth fixing ring 25 is sealed on the fixing plate 18. Sludge hopper 1 through
Attach to.

The mounting height of this rotating roll 18 is the rotating roll 1
The height is such that the cloth 15 stretched around the outer circumference of 8 slightly presses down the surface of the supplied sludge.

The drive source 11 for the rotary roll 18 is driven by a chain or the like from the guide rolls 3a, 3b, etc. of the belt press main body, and is configured to rotate in the opposite direction to the direction of movement of the sludge. A scraper 28 is provided to scrape off the sludge 14 on the cloth 15 adhering to the surface of the rotating roll 18.

In this embodiment configured in this manner, the rotating roll 18 having a length equal to or longer than the entire width of the sludge hopper 1 rotates in the opposite direction to the movement by the belt of the belt press. When the sludge 14 in the dewatering process is squeezed by the rotating roll 18, excess moisture in the sludge 14 enters the hollow part of the inner cylinder 19 of the rotating roll 18 through the material 15 forming the surface of the rotating roll 18. This excess water is removed from both ends 20 of the rotating roll 18.
is discharged to the outside. On the other hand, the sludge from which excess water has been removed is sent to the next step, the dewatering section, with the thickness approximately equal to the gap between the rotating roll 18 and the rolling surface.

As explained in the above embodiment, the following effects can be obtained by the present invention.

That is, in the gravity dewatering section, the flow of the sludge supplied from the sludge supply hopper is blocked by rotating a hollow roll in the region between both side walls of the hopper in the opposite direction to the moving direction of the lower cloth using a drive device. Since it can be stored, gravity dehydration can be performed extremely efficiently by increasing gravity and applying water pressure. In addition, the excess water that separates in the upper part of the sludge and is difficult to pass through the sludge layer forms the surface of the hollow roll and is sufficiently impregnated with water by the water-absorbing material that has water absorption properties. It can enter the hollow part of the inner cylinder and be discharged to both ends.

Note that when the hollow roll rotates, the hollow roll rotates in the opposite direction to the moving direction of the cloth as described above, which increases the apparent speed difference between the hollow roll and the sludge moving in the opposite direction. , thereby minimizing the adhesion of sludge to the surface of the water-absorbing material.

Furthermore, as the lower cloth moves, some of the sludge escapes from the gap between the hollow roll and the press-dewatering section, but at this time, the water-absorbing material stretched around the outer circumference of the hollow roll slightly presses down the surface of the supplied sludge. At the height of
In addition, by rotating the hollow roll as described above, the fresh surface of the water-absorbing material always comes into contact with the sludge to efficiently absorb water, and the sludge in the dewatering process is strongly squeezed to further promote preliminary dewatering. can do.

In this way, with the device of the present invention, it is possible to significantly reduce the water content in the sludge supplied to the press dewatering section and to equalize the layer thickness of the sludge layer. It reduces the load, prevents side leaks from the edges of the fabric, makes effective use of the fabric, and can be expected to increase throughput, while also shortening the machine length of the belt press.

The present invention can be applied not only to belt presses but also to sludge dewatering machines such as band presses, drum presses, screw press pre-dehydrators, belt press vacuum dehydrators, press filters, etc.
It can also be applied to paper making machines.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a belt press, Figure 2 is a diagram of sludge in the belt press gravity dewatering section, Figure 3 is a diagram of raw sludge, Figure 4 is a diagram of sludge with flocs, Figure 5 is a schematic diagram of sludge floc on cloth, Figure 6 is a perspective view of an embodiment of the present invention, and Figure 7 is a schematic diagram of a sludge floc on cloth.
The figure is a side view thereof. 1...Sludge supply hopper, 1a...Side wall, 2
a, 2b...Upper and lower cloths, 3a, 3b...Upper and lower guide rolls, 4a, 4b...Upper and lower wedge dewatering rolls, 5...Compression dewatering rolls, 6a, 6b...Upper and lower peeling rolls, 7a, 7b ...Upper and lower tension rolls, 8...Drainage tray, 9a, 9b...Upper and lower scrapers, 10...Cake conveyor, 11...
...Flock, 11a...Lower flock, 12...
Separated water, 12a... Super water, 12b... Lower separated water, 12c... Upper separated water, 13... Drive source, 1
4...Sludge, 15...Cloth (water absorbing material), 16...
Seal material, 17... Seal fixing material, 18... Hollow rotating roll, 19... Hollow part, 20... Both ends,
21...Bearing, 22...Drive sprocket, 2
3...shaft, 24...stay, 25...cloth fixing ring, 26...reinforcement ring, 27...hole, 28...
…scraper.

Claims (1)

[Scope of utility model registration request] An upper cloth stretched between a plurality of upper rolls and the staggered rolls, a lower cloth stretched between a plurality of lower rolls and the staggered rolls, and a drive for driving the cloth. In the gravity dewatering section of the belt press dewatering machine, which consists of a source and a sludge supply hopper that supplies sludge onto the lower cloth, the height is set on the lower cloth to store the sludge and the separated water present thereon. a sludge supply hopper having a partition wall, and a hollow space having a water-absorbing material with good water absorption on its surface, watertightly penetrating both walls in the width direction of the sludge supply hopper, and disposed so as to be in contact with the sludge surface on the lower cloth. A rotating roll, a rotating roll drive source that rotates the hollow rotating roll in a direction opposite to the transporting direction of the sludge, and a system for transferring water absorbed by the water absorption material of the hollow rotating roll through the hollow part of the hollow rotating roll. A dewatering auxiliary device for a belt press dehydrator, comprising a dewatering means for discharging water to the outside.