JP2016073929A - Belt press filter cloth fold unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt press in which a filtration space is formed by folding-back a piece of endless shape filter cloth, and thereby there is no occurrence of a side leak.SOLUTION: Provided is, in a belt press 1 in which a piece of endless shape filter cloth 3 is travel freely wound around over a plurality of rollers 2--, a filter cloth fold unit in which by including: a pressing roller 11 for pressing a filter cloth 3 downwardly to form an U-shaped bottom portion; a guide roller 12 for folding back both ends in width-direction of the filter cloth 3 at both sides of the pressing roller 11, to form U-shaped both sides; and a plurality of guide bar 13 for folding back to the sludge supplied side so as both ends in width-direction of the filter cloth 3 folded-back in U-shape, to overlap, the filter cloth 3 can be smoothly folded back and the sludge can be dewatered like wrapping the sludge with the filter cloth 3, and thereby there is no occurrence of a side leak.SELECTED DRAWING: Figure 4

Description

The present invention relates to a belt press that forms a filtration space by folding back an endless filter cloth that hangs around freely in the width direction.

Conventionally, a belt press that dewaters sludge sandwiched between two filter cloths by using two endless filter cloths by multiple rollers and dewatering them by the tension of the filter cloths and the pressing force of the pressure roller. It is used.
In addition, in Patent Document 1, a single endless filter cloth is held in a double fold shape perpendicular to the traveling direction of the filter cloth, and sludge is supplied to the double fold and dehydrated by a pressure roller. A belt press is disclosed.

Further, Patent Document 2 discloses a moromi frying tank method that squeezes moromi in a tri-fold filter cloth using an apparatus for squeezing moromi.
Similarly, Patent Document 3 discloses an apparatus that wraps and squeezes moromi with a trifolded filter cloth and folds the filter cloth into three folds.

JP 58-50197 A Japanese Examined Sho 46-28152 Japanese Patent Publication No. 46-22557

In the belt press using two conventional filter cloths, or in the dewatering part of the belt press disclosed in Patent Document 1, the moisture content of sludge is high or the supply amount is large. For example, part of the sludge escapes in the vertical and horizontal directions. Here, the longitudinal direction indicates the traveling direction of the filter cloth, and the lateral direction indicates a direction perpendicular to the traveling direction (width direction) on the filtration surface of the filter cloth.

In a conventional belt press using an endless filter cloth, two filter cloths are stacked one above the other, or one filter cloth is folded in two to form a filtration space between the filter cloths. When the filtration space is formed in this way, the filter cloth forming the filtration space is always torn and discontinuous at both ends or one end in the longitudinal direction of the filtration space deformed by external pressure. Therefore, the mating surface of the filter cloth is easily opened by the pressure from the inside.
Therefore, when pressure is applied from the outside during dehydration and sludge in the filtration space escapes in the lateral direction, there is a possibility that side leakage occurs and the sludge protrudes from the end of the filter cloth.
For these reasons, the belt press is often limited to the pressure of pressing, and is often inferior to other dehydrators in terms of moisture content of the dehydrated cake.

Moreover, although patent document 2 and patent document 3 disclose the technology of wrapping and squeezing moromi in a tri-fold filter cloth, the tri-fold filter cloth is further folded, stacked, and pressed. It does not squeeze and squeeze the filter cloth continuously.

In a belt press in which an endless piece of filter cloth is run around a plurality of rollers, the filter cloth is pressed downward to form a U-shaped bottom, and the filter cloth is formed on both sides of the press roller. By having a guide roller that bends both ends in the width direction to form both sides of the U shape, and a plurality of guide bars that bend on the sludge supply side so as to overlap the width direction both ends of the filter cloth that is bent in the U shape, One endless filter cloth can be smoothly folded back and the filter cloth can be run while forming a filtration space.

By arranging a hopper for supplying sludge on the downstream side of the pressing roller and on the upstream side of the guide rod, the sludge supplied to the U-shaped filter cloth does not flow outside.

Since the guide bar extends horizontally from the side of the filter cloth toward the upper side of the filter cloth, both side ends of the U-shaped filter cloth can be folded back to the sludge supply side.

One or more guide wheels are disposed on the downstream side of the guide rod, the guide wheels extending from the lower side of the filter cloth to the upper side of the filter cloth along the side, and a plurality of rotating bodies attached to the rotary shaft. With this configuration, the side surface of the filtration space is supported, and the development of the filter cloth is prevented above the filtration space.

A rotary body having a width equal to the width of the filter cloth is attached to the rotary shaft below the filter cloth, thereby supporting the filtration space from below and preventing downward deflection.

By using the folding device of the present invention, it is possible to smoothly fold one endless filter cloth and run the filter cloth while forming a filtration space. Continuous dehydration can be performed by supplying sludge to the filtration space while folding the filter cloth, and running the endless filter cloth. Further, the folding device can easily determine the position of folding the filter cloth, and can cope with various ways of folding the filter cloth.

Since the belt press using the folding device of the present invention forms the filtration space by folding back the filter cloth at both side ends of the filtration space, no side leak occurs. Since the filtration space is formed by overlapping the folded filter cloths to form a seal, the seals of the overlapped filter cloths become stronger by applying external pressure. Since side leakage does not occur, it becomes possible to increase the amount of sludge supplied and to dehydrate at a higher pressure.
Also, no special equipment is required to seal the filtration chamber. Furthermore, since dehydration is performed while running an endless filter cloth, dehydration can be performed continuously.

1 is a schematic side view of a belt press according to the present invention. Similarly, it is the schematic of the filter cloth folded with the folding apparatus. Similarly, it is the schematic of the other filter cloth folded by the folding apparatus. Similarly, it is a top view of the folding device of a filter cloth. Similarly, it is a side view of a filter cloth folding device. Similarly, it is sectional drawing of the guide ring of a folding device. Similarly, it is a top view of the filter cloth wound around the developing roller.

The present invention is a belt press in which a filtration space is formed by folding a piece of endless filter cloth that is hung around freely and dewatering is performed by supplying sludge to the filtration space.
FIG. 1 is a schematic side view of a belt press according to the present invention.
The belt press 1 of the present invention includes a plurality of rollers 2, a single endless filter cloth 3 that can be run around the plurality of rollers 2, and a hopper that supplies sludge onto the filter cloth 3. 4, the filter cloth 3 is folded back from both sides in the width direction of the filter cloth 3 to the sludge supply side, and the folded filter cloth 3 is overlapped to form a filtration space 5, and the shear for winding the folded filter cloth 3 A roll 7 and a developing roller 8 for developing the folded filter cloth 3 are provided.

One endless filter cloth 3 wound around a plurality of rollers 2 is folded back at both ends in the width direction by a folding device 6. The folding device 6 supplies the sludge from the hopper 4 while folding both ends of the filter cloth 3 in the traveling direction (vertical direction) so that the endless filter cloth 3 receives the sludge. Therefore, in the process of folding, both ends of the filter cloth 3 are folded, and sludge is supplied onto the filter cloth 3 when the cross section of the filter cloth 3 becomes U-shaped. The filter cloth 3 is folded by the folding device 6, and the filter cloth 3 is overlapped to form a filtration space 5, and the supplied sludge is wrapped with the filter cloth 3. The filter cloth 3 that has supplied the sludge to the filtration space 5 is wound around the shear roll 7 to dehydrate the sludge. After dehydration, the filter cloth 3 folded by the developing roller 8 is developed, and the dehydrated cake is discharged by a peeling device.

FIG. 2 is a schematic view of the filter cloth folded by the folding device according to the present invention.
The endless filter cloth 3 shown in FIG. 2 (a) has folding portions 9a and 9b that extend in the direction of travel of the filter cloth 3 and fold back to the sludge supply side from both ends in the width direction. . First, a 1/3 width portion (folding surface 10a) is folded inward at one folding portion 9a at the 1/3 width portion, and then 1 / at the other folding portion 9b at the 1/3 width portion. The three-width portion (folding surface 10b) is folded back inward. Accordingly, the filter cloth 3 is folded back so that the folding surfaces 10a and 10b are overlapped on the inner side to form a trifold, and the filtration space 5 is formed inside the trifold.

By folding back the filter cloth 3, both ends in the longitudinal direction of the filtration space 5 deformed by pressure are formed by the folded portions 9 a and 9 b of the filter cloth 3, so both ends of the filtration space 5 formed by the trifold filter cloth 3 are It is not torn and no side leak occurs.
Further, the folded surfaces 10 a and 10 b of the folded filter cloth 3 are overlapped to seal the filtration space 5. By applying pressure from the outside, the strength of the seal at the overlapping portions of the folding surfaces 10a and 10b is increased, so that sludge does not leak from the overlapping portions of the folding surfaces 10a and 10b.
In the embodiment of the present invention, the trifold filter cloth 3 is used, but the effects of the present invention can be obtained by other folding methods.

The endless filter cloth 3 shown in FIG. 2 (b) has folding portions 9a and 9b that fold back from the both sides in the width direction to the sludge supply side at a position slightly on the center side from the 1/4 width. First, the folding surface 10a is folded inward from the folding portion 9a slightly on the center side than the quarter width, and then the other folding surface 10b is folded on the inside from the folding portion 9b slightly on the center side than the quarter width. Since the folded portions 9a and 9b are folded back at a position slightly central from the both sides, the folded surfaces 10a and 10b overlap to form the filtration space 5 inside.

In addition, since the effect of this invention will be acquired if the both ends of the folded back filter cloth 3 overlap, one side is folded inward at a 1/4 width location, and the other is a location on the middle side slightly from the 1/4 width location. The effects of the present invention can also be obtained by folding inward. Therefore, at least one of the folded portions 9a and 9b may be set slightly on the center side from the quarter width portion. Moreover, it does not ask which of the cloth cloth both ends up and down in the overlapping part of the folding surfaces 10a and 10b.

Since the filter cloth 3 is folded back, both ends in the longitudinal direction of the filtration space 5 deformed by pressure are formed by the folded portions 9a and 9b of the filter cloth 3, and both ends of the filtration space 5 are not torn, Does not occur.
Further, the folded surfaces 10 a and 10 b of the folded filter cloth 3 are overlapped to seal the filtration space 5. By applying pressure from the outside, the strength of the seal at the overlapping portions of the folding surfaces 10a and 10b is increased, so that sludge does not leak from the overlapping portions of the folding surfaces 10a and 10b. Since the area where the folding surfaces 10a and 10b overlap is small compared to the tri-fold, the effective filtration area can be increased.

As described above, the endless filter cloth 3 can form the filtration space 5 by folding back both sides in the width direction from the both ends to more than 1/4 width and 1/3 width or less. .

FIG. 3 is another schematic view of the filter cloth folded by the folding device according to the present invention.
In addition to the filter cloth shown in FIG. 2, as shown in FIG. 3A, the end face of the endless filter cloth 3 is folded at the center in the width direction with the fold 9 a, and the filter cloth 3 is folded at both ends. It is also possible to form the filtration space 5 inside by folding back the folding surface 10b from the portion 9b.

Further, as shown in FIG. 3 (b), at one end of the filter cloth 3 in the width direction, one side of the filter cloth 3 is a folded surface with a portion having a width of 1/3 or more and less than 10 width from one end in the width direction. Even if the folding surface 10b is folded using the other side of the filter cloth 3 as a folded portion 9b with the other width of the filter cloth 3 being 1/4 width or less from the other end in the width direction, the folded surfaces 10a and 10b of the filter cloth 3 are overlapped. If it turns back, the filtration space 5 can be formed.

As described above, various forms of folding the filter cloth 3 according to the present invention can be considered. In any case, one endless filter cloth 3 is folded back to the sludge supply side at both ends in the width direction. The filtration space 5 is formed by overlapping the three folding surfaces 10a and 10b. The endless filter cloth 3 prevents the occurrence of side leaks by forming both ends in the longitudinal direction of the filtration space 5 that is deformed by pressure from the outside by the folded portions 9 a and 9 b of the filter cloth 3. Then, the folded surfaces 10a and 10b of the endless filter cloth 3 that is folded back partially serve as a seal for the filtration space 5 by overlapping each other. In order to increase the sealing performance, the overlapping area of the filter cloth 3 folding surfaces 10a and 10b may be increased. Further, the sealing performance can be improved by further folding back the overlapping portions of the filter cloth 3 folding surfaces 10a and 10b.

The filter cloth 3 folding device 6 of the present invention bends the traveling filter cloth 3 by arranging a plurality of guides. In this embodiment, a folding device 6 that folds the filter cloth 3 in three is used.

FIG. 4 is a plan view of the filter cloth folding device according to the present invention.
FIG. 5 is a side view of the filter cloth folding device according to the present invention.
As shown in FIGS. 4 and 5, the folding device 6 of the present invention is composed of a pressure roller 11 and a guide roller 12 that bend the filter cloth 3 into a U shape, and guide bars 13 a and 13 b that horizontally guide the filter cloth 3. Yes. Moreover, the hopper 4 is arrange | positioned in the position which can supply sludge in the filter cloth 3 bent in the U shape.

The filter cloth 3 folded by the folding device 6 is formed in a U shape by the pressing roller 11 so that sludge does not leak out. The width of the pressing roller 11 is equal to the folded width of the filter cloth 3, and the filter cloth 3 is formed in a U shape by pressing the center portion of the upper surface of the filter cloth 3 downward with the pressing roller 11. Accordingly, the pressing roller 11 forms a U-shaped bottom.
The pressing roller 11 according to the present embodiment is provided with a pair of rollers attached to both side surfaces of the lower end of the column.
At the same time, both ends of the filter cloth 3 are bent by the guide rollers 12 arranged perpendicular to both side surfaces of the pressing roller 11 to form U-shaped side surfaces. On the downstream side of the pressing roller 11, a hopper 4 for supplying sludge is suspended toward the traveling filter cloth 3, and the sludge is continuously supplied.

The filter cloth 3 whose both side surfaces are vertical along the guide roller 12 is bent toward the sludge supply side by a plurality of horizontally fixed guide bars 13 downstream from the position where the hopper 4 is disposed.
One end of the filter cloth 3 on the vertical side is guided to bend toward the sludge supply side at the bottom of the guide bar 13a. Further, the filter cloth 3 supplied with sludge is supported at the upper part of the guide bar 13a ′ branched from the guide bar 13a toward the lower side of the filter cloth 3 so as not to bend. Thus, the filter cloth 3 is guided so as to be held between the guide bars 13a and 13a ′.
On the downstream side of the guide bar 13a, a guide bar 13a "for guiding one vertical filter cloth 3 (one folding surface 10a) to be bent horizontally is disposed. The guide bar 13a" It has enough length to guide horizontally to one edge.
By arranging the guide bars 13a, 13a ′, 13a ″ in this way, one folding surface 10a of the filter cloth 3 is smoothly bent.

The other vertical filter cloth 3 (the other folding surface 10b) is supported by a guide bar 13b arranged vertically along the end of the U-shaped filter cloth 3 so as not to tilt outward.
On the downstream side of the guide bar 13b, a guide bar 13b 'is disposed horizontally so that the other end of the filter cloth 3 is bent toward the sludge supply side.

On the downstream side of the guide rods 13a, 13a ′, 13a ″, 13b, 13b ′, guide wheels 24 that horizontally guide both ends of the folded filter cloth 3 and support it in the width direction may be provided.
FIG. 6 is a cross-sectional view of the guide wheel of the folding device according to the present invention.
The guide wheel 24 includes a rotating shaft 25 and a plurality of rotating bodies 26 attached to the rotating shaft 25. The rotary shaft 25 is disposed along the one end of the filter cloth 3 from below the filter cloth 3, and extends to above the filter cloth 3.

As shown in FIGS. 4 and 5, the guide ring 24 a supports one side surface of the filtration space 5 formed by the folding portion 9 a of the filter cloth 3, so that the overlap between the filter cloth 3 ends does not open above the filtration space 5. The filter cloth 3 is covered at both ends.
The guide ring 24b supports the other side surface of the filtration space 5 formed by the folded portion 9b of the filter cloth 3, and covers both ends of the filter cloth 3 so as not to open the overlap of both ends of the filter cloth 3 above the filtration space 5.
As shown in FIG. 6, at the bottom of the filter cloth 3, the use of rotating bodies 26 a and 26 b having a width equivalent to the width of the filter cloth 3 prevents the filter cloth 3 wrapped with sludge from bending downward. But you can.

By guiding the filter cloth 3 with such a folding device 6, the filter cloth 3 is folded in three while traveling and wraps sludge inside.
The folding device 6 described above can cope with various ways of folding the filter cloth 3 by appropriately arranging a plurality of guides as well as the three folding of the filter cloth 3.

As shown in FIG. 1, the filter cloth 3 wrapped with sludge by the folding device 6 is wound around a shear roll 7 to dehydrate sludge. The shear roll 7 is wound around the filter cloth 3 to apply surface pressure to the sludge in the filtration space 5 and further shears due to the difference in travel speed between the filter cloth 3 traveling inside and the filter cloth 3 traveling outside. Apply power to dehydrate. Dehydration is possible not only by the shear roll 7 but also by applying a high pressure from the outside with a pressure belt or a pressure roll. Since the filter cloth 3 is folded in three to prevent side leaks, no side leak is generated even when the pressure is increased.

FIG. 7 is a plan view of a filter cloth wound around a developing roller according to the present invention.
The filter cloth 3 wound around the plurality of shear rolls 7 is developed into three folded by the developing roller 8, and the dewatered cake is discharged by the peeling device. The filter cloth 3 that has been folded in three is unfolded, wound around the spreading roller 8, and traveled, so that the filter cloth 3 that has been folded in three is naturally spread between the shear roll 7 and the spreading roller 8.
Since the dewatered cake dehydrated at high pressure has good peelability, the dewatered cake can be easily peeled by wrapping the filter cloth 3 around a peeling roller provided as a peeling device. In this embodiment, the developing roller 8 is used as a peeling roller.

Since the belt press of the present invention includes a folding device for folding a single endless filter cloth to form a filtration space, the filter cloth can be folded smoothly. Since the filtration space is formed with folded surfaces at both ends, side leakage does not occur. Therefore, it is possible to perform high-pressure dehydration that cannot be performed conventionally due to side leakage. INDUSTRIAL APPLICABILITY The present invention can be used for various types of belt presses that fold a filter cloth to form a filtration space.

DESCRIPTION OF SYMBOLS 1 Belt press 2 Roller 3 Filter cloth 4 Hopper 6 Folding device 11 Press roller 12 Guide roller 13a, 13b Guide rod 24 Guide wheel 25 Rotating shaft 26 Rotating body

Claims (5)

In a belt press (1) in which a single endless filter cloth (3) is run around a plurality of rollers (2 ...).
A pressure roller (11) that presses the filter cloth (3) downward to form a U-shaped bottom,
A guide roller (12) that bends both ends in the width direction of the filter cloth (3) on both sides of the pressure roller (11) to form U-shaped side surfaces;
A belt press filter cloth folding device, comprising: a plurality of guide bars (13) bent to a sludge supply side so that both ends in the width direction of the U-shaped filter cloth (3) are overlapped. 2. The belt press filter cloth fold according to claim 1, wherein a hopper (4) for supplying sludge is disposed downstream of the pressing roller (11) and upstream of the guide rod (13). apparatus. 3. The belt press filter cloth folding according to claim 1, wherein the guide bar (13) extends from the side of the filter cloth (3) toward the top of the filter cloth (3). 4. apparatus. One or more guide wheels (24) are disposed downstream of the guide rod (13);
The guide ring (24) includes a rotating shaft (25) extending from the lower side of the filter cloth (3) to the upper side of the filter cloth (3) from the lower side,
The belt press filter cloth folding device according to any one of claims 1 to 3, wherein the belt press filter cloth folding device comprises a plurality of rotating bodies (26) attached to the rotating shaft (25). The belt press according to claim 4, wherein a rotating body (26) having a width equal to the width of the filter cloth (3) is attached to the rotating shaft (25) below the filter cloth (3). Filter cloth folding device.

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