JP2018015732A - Filter cloth for filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter cloth for a filter press not imposing a burden on a latching part of a liquid feeding plate, when discharging a dewatering cake by opening a pair of filter cloths of the filter press.SOLUTION: In a filter cloth for a filter press for sandwiching a liquid feeding plate between a pair of filter cloths suspended between filter plates, and for supplying stock solution into a filtration chamber formed between the filter cloths and dewatering therefrom, a bag-shaped pocket for storing and holding the liquid feeding plate is connected to the filter cloths between the pair of filter cloths, and thereby the liquid feeding plate can be attached/detached easily, and even when the filter cloths are opened in order to discharge a dewatering cake, a burden is hardly imposed on a connection part of the filter cloths because the pocket has a bag-like shape.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an attachment / detachment structure of a liquid supply plate for supplying a stock solution to a filtration chamber formed between a pair of filter cloths suspended from a filter press, and in particular, a filter having a structure in which the liquid supply plate can be easily attached / detached. It relates to a filter cloth for press.

A filter press hangs a pair of filter cloths on a plurality of filter plates arranged in a freely openable and closable manner, and presses the stock solution into a filtration chamber formed between the pair of filter cloths from a liquid supply plate fixed to the filter cloths. Solid-liquid separation is performed with cloth.
For example, a conventional filter press liquid supply plate hangs a pair of filter cloths up and down between a filter plate and a squeezed filter plate, and fastens the presser plate to each filter cloth with a bolt and attaches the head of the bolt. Patent Document 1 discloses a filter press having a structure for fixing a liquid supply plate to a filter cloth.

  In addition, the mounting band is disposed along the inner surface of the supply path, and both end portions thereof are bent along the notch portions provided at the left and right end portions of the supply path of the liquid supply plate, respectively, and the bent portion is filter cloth. Patent Document 2 describes a technique for attaching a liquid supply plate to a filter cloth by engaging with a part of the filter.

  Then, at the mounting position of the liquid supply plate between the pair of filter cloths, a filter cloth is attached along the left and right of the liquid supply plate, and a latching member is provided to connect the pair of filter cloths at the lower end of the liquid supply plate. Patent Document 3 discloses a filter press in which a liquid supply plate is disposed at a mounting position surrounded by a landing portion and a latching member, so that the liquid supply plate can be mounted without being shifted left, right, or downward from the mounting position. Have been described.

No. 7-5847 Utility Model Registration No. 2565955 Japanese Patent Application Laid-Open No. 2015-066540

  Conventionally, filter cloths used in filter presses are consumables that need to be replaced periodically when the filtration operation is repeated. At that time, the liquid supply plate for supplying the stock solution between the pair of filter cloths is detached from the old filter cloth and attached to the new filter cloth.

  In the case of using bolts and pins as in Patent Document 1, it takes time to install the bolts and pins, and when the screw part is loosened, the head part of the bolt pops out to tighten the filter plate. Occasionally, the filter plate, diaphragm, packing, or filter cloth may be damaged. The liquid supply plate is also prone to clogging due to fibers contained in the stock solution. In this case, first remove the filter cloth suspended between the filter cloths from the filter press body, remove the bolts and pins, and remove the liquid supply plate. It was necessary to inspect and clean, and maintenance was complicated.

  In Patent Document 2, the liquid supply plate is fixed to the filter cloth without using bolts or pins, but the upper portion of the liquid supply hole of the liquid supply plate is fixed between the filter cloths only by the pressure of the mounting band. Therefore, when pressing and cake peeling are repeated, the supply plate is displaced downward, and when the amount of displacement is increased, the supply plate may drop downward.

  In Patent Document 3, a liquid supply plate is hooked to a hooking member connected to a pair of filter cloths, and a pair of filter cloths are connected to both sides of the liquid supply plate to attach the liquid supply plates. In this case, if the filter cloth is opened when discharging the dewatered cake, the hooking member restricts the opening of the pair of filter cloths, and the dewatered cake remains in the vicinity of the liquid supply plate. Moreover, if it tries to open a filter cloth to the liquid supply board vicinity, stress will concentrate on a connection part and will be damaged.

  The present invention provides a filter press filter cloth that facilitates the removal of a liquid supply plate, does not leave a dehydrated cake when the dehydrated cake is discharged, and further reduces the load on the structure for attaching the liquid supply plate.

  Holding the liquid supply plate between a pair of filter cloths suspended between the filter plates, and storing the liquid supply plate in the filter cloth of the filter press that feeds and dehydrates the stock solution into the filtration chamber formed between the filter cloths. The bag-like pocket that is held in place is connected to the filter cloth between the pair of filter cloths, so that the liquid supply plate can be easily attached and detached, and even if the filter cloth is opened to drain the dehydrated cake, the pocket is A load is not easily applied to the connecting portion of the filter cloth.

  The side surface of the pocket is provided with a side hole corresponding to the liquid supply passage of the liquid supply plate, and a bottom hole corresponding to the liquid supply passage of the liquid supply plate is provided on the bottom surface. Thus, the stock solution can be supplied to the filtration chamber through the liquid supply plate stored in the pocket.

  The upper edge of the pocket has a connecting part connected to one of the pair of filter cloths and a connecting part connected to the other of the pair of filter cloths, so that the pair of filter cloths are inverted when the dehydrated cake is discharged, and the connecting parts The dehydrated cake can be easily discharged. In addition, since the pair of filter cloths can be opened widely, there is a margin for inversion of the filter cloth, and a load is not easily applied to the connecting portion between the pocket and the filter cloth.

  By forming gussets that are detachable from the pair of filter cloths on both sides of the connecting portion, the pockets can be easily opened and the liquid supply plate can be easily attached and detached. Moreover, the opening width of a pair of filter cloth becomes large.

In the present invention, since the liquid supply plate is attached to the filter cloth without using the stopper, the stopper does not contact the filter cloth and the filter cloth is not damaged. In addition, since the stopper is not used, the connecting portion is not damaged when the filter cloth contracts.
Since the liquid supply plate is stored and mounted in a pocket connected to the filter cloth, it is easy to remove, and only the liquid supply plate can be replaced without removing the filter cloth from the filter press.
By connecting the upper edge of the pocket of the liquid supply plate to the filter cloth, when discharging the dewatered cake formed between the pair of filter cloths, the pair of filter cloths can be opened widely, and the dewatered cake is discharged. It becomes easy. And since the filter cloth can be reversed to the vicinity of the connecting portion, when discharging the dewatered cake formed below the liquid supply plate, there is a margin for the inversion of the filter cloth, and it is difficult for the connecting portion to be loaded. .

It is a perspective view of a pair of filter cloth which fixed the liquid supply board of the filter press concerning the present invention. Similarly, it is a principal part side view of a filter press. Similarly, it is the top view and side view of the liquid supply board of a filter press. Similarly, it is a perspective view of a pocket provided between a pair of filter cloths of the filter press. Similarly, it is a front view of the filter cloth of a filter press. Similarly, it is a longitudinal cross-sectional view of the filter cloth of a filter press. It is AA sectional drawing of the filter cloth of FIG. It is a cross-sectional perspective view of the filter cloth which concerns on the other Example 1 of this invention. It is a front view of the filter cloth of the filter press which concerns on other Example 2 of this invention.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a pair of filter cloths to which a liquid supply plate of a filter press according to the present invention is fixed.
The upper ends of the pair of filter cloths 1 are joined together to form the bag part 2, and the bag parts 3 are also formed at the lower end of the filter cloth 1. The upper filter cloth core 4 and the lower filter cloth core 5 are inserted into the upper bag portion 2 and the lower bag portion 3, respectively. The stock solution passage 7 of the liquid supply plate 8 is aligned with the through hole 6 opened in the upper center of the filter cloth 1, and the liquid supply plate 8 is sandwiched between the pair of filter cloths 1. A liquid supply path 9 is provided for supplying the raw liquid to the filtration chamber formed between the filter cloths 1 and 1 by branching from the raw liquid passage 7 of the liquid supply plate 8.

  FIG. 2 is a side view of an essential part of the filter press according to the present invention. A pair of filter cloths 1 shown in FIG. 1 are arranged between filter plates 10 and 10 which are arranged in parallel to be openable and closable, and a drive chain 11 connected to both ends of an upper filter cloth core 2 of the filter cloth 1 is connected to the filter plate 10. It is hung on a sprocket 12 that is supported on the shoulder portion.

  The lower filter cloth core 5 is inserted into the lower end of the filter cloth 10 by suspending the lower ends of the filter cloth 1 suspended from the front and rear of the filter board 10 on the return rolls 13 that are suspended from the lower part of the filter board 10. Are connected to the other ends of the front and rear drive chains 11, respectively, so that the filter cloth 1 can be raised and lowered in a seesaw shape. When the parallel filter plates 10 are closed, the liquid supply plate 8 provided between the filter cloths 1 and 1 is sandwiched between the front and rear filter plates 10, and a pair of filter cloths 1 stretched on the filter bed of the filter plate 10, A filtration chamber 14 is formed between the two. The stock solution passage 7 of the feed plate 8 is communicated with the stock solution supply path formed in the filter plate 10, and the stock solution is pressed into the filtration chamber 14 from the feed channel 9 of the feed plate 8, and solid-liquid separation is performed with the filter cloth 1. Do.

FIG. 3 is a plan view and a side view of a liquid supply plate of the filter press according to the present invention.
A stock solution passage 7 extends through the front and rear surfaces slightly above the center of the solution supply plate 8 and branches downward from the solution supply passage 7 to provide a solution supply passage 9. The liquid supply path 9 passes through the center of the liquid supply plate 8 to the lower end.
The bottom surface of the liquid supply plate 8 is configured in a tapered shape so that the contacted filter cloth 1 is not damaged.

FIG. 4 is a perspective view of a pocket provided between a pair of filter cloths of the filter press according to the present invention. In the present invention, in order to arrange the liquid supply plate 8 between the pair of filter cloths 1, 1, a pocket 15 for storing the liquid supply plate 8 is used.
The pocket 15 is formed in a bag shape by weaving synthetic fibers such as PP, and is disposed between the pair of filter cloths 1 and 1. The liquid supply plate 8 is inserted into the inside through the opening at the top of the pocket 15 and supported by the bottom surface of the pocket 15, thereby holding the liquid supply plate 8 between the filter cloths 1 and 1.
A side hole 16 corresponding to the stock solution passage 7 of the liquid supply plate 8 is provided in the center of the side surface of the pocket 15, and when the liquid supply plate 8 is inserted into the pocket 15, the stock solution passage 7 and the through hole 6 of the filter cloth 1. The side hole 16 of the pocket 15 communicates.

  A bottom hole 17 corresponding to the liquid supply path 9 is provided on the bottom surface of the pocket 15. When the liquid supply plate 8 is inserted into the pocket 15, the liquid supply path 9 and the bottom hole 17 of the pocket 15 communicate with each other. Therefore, the stock solution supplied to the filter press is supplied from the stock solution passage 7 through the liquid supply passage 9 to the filtration chamber 14 between the filter cloths 1 and 1.

The width of the pocket 15 is appropriately set to such a size that the stock solution passage 7 of the liquid supply plate 8 and the through hole 6 of the filter cloth 1 do not shift to the left and right. Similarly, the depth of the pocket 15 is inserted into the liquid supply plate 8. At this time, the depth is set as appropriate so that the stock solution passage 7 and the through hole 6 communicate with each other.
The pocket 15 is formed into a bag shape by appropriately stitching the bottom or side.

FIG. 5 is a plan view of the filter cloth of the filter press according to the present invention. FIG. 6 is a longitudinal sectional view of the filter cloth of the filter press according to the present invention.
Between the pair of filter cloths 1, 1, the pocket 15 is disposed at a position where the through hole 6 that opens to the filter cloth 1 and the side hole 16 of the pocket 15 communicate with each other, and the filter cloth 1 and the pocket 15 are connected. By connecting the pocket 15 between the filter cloths 1 and 1, the liquid supply plate 8 can be easily attached and detached.
Moreover, the pocket 15 arrange | positions the pocket 15 so that the upper end edge 18 may be connected with the filter cloth 3, and it may be suspended. An upper end edge 18 of the pocket 15 connected to one of the pair of filter cloths 1 is a connecting portion 19a, and an upper end edge 18 of the pocket 15 connected to the other of the pair of filter cloths 1 and 1 is a connecting portion 19b.

When the upper end edge 18 of the pocket 15 and the filter cloth 1 are connected and suspended, the lower portion of the pocket 15 does not adhere to the filter cloth 1, and when discharging the dehydrated cake, the filter cloth 1 is connected to the connecting portion 19 a of the pocket 15. 19b can be opened and discharged. Therefore, it is possible to open the pair of filter cloths 1 and 1 up to the height of the liquid supply plate 8, and the dehydrated cake can be easily peeled off. When the dewatered cake is discharged so that the pair of filters 1 and 1 cloth are opened to the lower side of the liquid supply plate 8, a large load is not applied to the connecting portions 19a and 19b of the pocket 15 and the filter cloth 1.
Notches may be formed on the side surface and bottom surface of the pocket 15 as long as the stored liquid supply plate 8 can be supported. The stock solution accumulated in the pocket 15 is discharged from the notch, and the sealing failure of the filter plate can be prevented.

FIG. 7 is a cross-sectional perspective view of the filter cloth of FIG.
The pocket 15 provided between the pair of filter cloths 1, 1 connects the connecting part 19 a of the upper edge 18 to one filter cloth 1 and the connecting part 19 b to the other filter cloth 1.
In FIG. 7, the entire circumference of the upper edge 18 of the pocket 15 is connected to one of the filter cloths 1. The side surface below the upper edge 18 of the pocket 15 is configured to be detachable from the filter cloth 1.
Accordingly, when the dewatered cake is discharged, the filter cloth 1 can be reversed up to the vicinity of the connecting portions 19a and 19b. Therefore, when the dewatered cake formed below the liquid supply plate 8 is discharged, the filter cloth 1 is reversed. There is a margin, and it is difficult to apply a load to the connecting portions 19a and 19b.
In this embodiment, the upper end edge 18 of the pocket 15 is connected to both of the pair of filter cloths 1, 1. However, if the upper end edge 18 is connected to one of the filter cloths 1, the effect can be obtained. .

FIG. 8 is a cross-sectional perspective view of a filter cloth according to another embodiment 1 of the present invention.
FIG. 8 is an AA cross-sectional perspective view of FIG. 5 and shows an embodiment different from FIG. The upper end edge 18 of the pocket 15 is configured to be detachable from the pair of filter cloths 1, 1 without connecting the both sides of the connecting portions 19 a, 19 b. That is, a gusset 20 is provided at the upper edge 18 of the pocket 15 to facilitate opening in the opening / closing direction of the filter cloth 1. By providing the gusset 20, the pocket 15 can be opened widely, so that the liquid supply plate 8 can be easily attached and detached. Further, the pair of filter cloths 1, 1 can be greatly opened by the gusset 20. If the length of the gusset 20 is adjusted to the thickness of the liquid supply plate 8, it is difficult for the displacement to occur when the liquid supply plate 8 is stored.

FIG. 9 is a front view of a filter cloth of a filter press according to another embodiment 2 of the present invention.
The pocket 15 provided between the pair of filter cloths 1, 1 in the other embodiment 1 has the same shape as the liquid supply plate 8, and the upper edge 18 is formed in an arc shape. The pocket 15 and the filter cloth 1 connect the highest position of the upper edge 18 and a part of the lowest position of the upper edge 18. Alternatively, the entire upper edge 18 may be connected along the arcuate upper edge 18.
Thus, when the filter plate 10 is closed for dehydration by using the pocket 15 in which the upper end edge 18 having the same shape as the liquid supply plate 8 is formed in an arc shape, the filter plate 10 and the liquid supply plate The stock solution is prevented from leaking through the gap of 8.
Further, since the upper edge 18 is connected to the filter cloth and the pocket 15 can be opened from the height of the lower ends of the connecting portions 19a and 19b, when the liquid supply plate 8 is inserted into the pocket 15, the liquid supply plate 8 The upper portion protrudes upward from the lower ends of the connecting portions 19a and 19b, and the liquid supply plate 8 can be easily attached and detached.

  In this way, the liquid supply plate 8 can be attached to and detached from the filter cloth 1 without using a stopper only by connecting the pocket 15 for storing the liquid supply plate 8 to the filter cloth 1. A connection position etc. can be suitably set according to the specification of a filter press.

  The filter press filter cloth according to the present invention is provided with a pocket for storing the liquid supply plate between a pair of filter cloths, so that the liquid supply plate can be easily attached and detached, and a load is not applied to the filter cloth because no stopper is used. Has been reduced. Therefore, the filter cloth is optimal for multi-chamber type filter presses for treating large-capacity sludges such as sewage sludge and sewage sludge, and filter presses for treating industrial wastewater containing stock solutions that corrode metals and the like.

DESCRIPTION OF SYMBOLS 1 Filter cloth 6 Through-hole 7 Stock solution flow path 8 Liquid supply plate 9 Liquid supply path 10 Filter plate 14 Filtration chamber 15 Pocket 16 Side hole 17 Bottom hole 18 Upper edge 19a, 19b Connection part 20 Machi

Claims (4)

A filtration chamber (14) formed between a pair of filter cloths (1, 1) by sandwiching a liquid supply plate (8) between a pair of filter cloths (1, 1) suspended between the filter plates (10, 10). In the filter cloth for filter press that dehydrates by supplying the stock solution to
A filter cloth for a filter press, wherein a bag-like pocket (15) for storing and holding a liquid supply plate (8) is connected to the filter cloth (1) between a pair of filter cloths (1, 1). A side hole (16) corresponding to the stock solution passage (7) of the liquid supply plate (8) on the side surface of the pocket (15);
A bottom hole (17) corresponding to the liquid supply path (9) of the liquid supply plate (8) on the bottom surface;
The filter cloth for filter press according to claim 1, wherein the through hole (6) of the filter cloth (1) communicates with the stock solution passage (7) and the side hole (16). The upper edge (18) of the pocket (15)
The connecting portion (19a) connected to one of the pair of filter cloths (1, 1) and the connecting portion (19b) connected to the other of the pair of filter cloths (1, 1). Or the filter cloth for filter presses of 2. The filter cloth for a filter press according to claim 3, wherein a gusset (20) that is detachable from the pair of filter cloths (1, 1) is formed on both sides of the connecting portion (19a, 19b). .

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