JPH11347311A - How to open the frame of the filter press and the filter press - Google Patents

Abstract

(57) [Problem] To improve the opening / closing method of a filter plate in a filter press, while maintaining the conventional advantage of preventing the frame opening distance of the filter plate from becoming longer and preventing the total length of the filter press from becoming longer. Another object of the present invention is to greatly reduce the conventional operation time when dehydration and washing are repeated in a plurality of batches. SOLUTION: This is a method of opening a frame between a plurality of pairs of a compressed filter plate 1a and a normal filter plate 1b provided in a filter press, wherein only a group of filter plates is moved to compress the compressed filter plate 1a and the compressed filter plate 1a. To open the filter chamber between the ordinary filter plates 1b adjacent to one side of
From the frame opening step and the open state in the first frame opening step, only the other group of filter plates is moved to close the compressed filter plate 1a and the compressed filter plate 1a that were closed in the first frame opening step. A second frame-opening step of opening the filter chamber between the ordinary filter plates 1b adjacent to the other side, and, from the open state in the second frame-opening step, only a group of filter plates in the first frame-opening step. A third frame which is moved in the same direction or the opposite direction to open the frame between the compressed filter plate 1a and the ordinary filter plate 1b adjacent to one side of the compressed filter plate 1a which has been closed in the second frame opening step.
And a frame opening step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of opening a frame of a filter press and a filter press, and more particularly, to an improvement of a filter press opening / closing system in the filter press.

[0002]

2. Description of the Related Art In general, a filter press having a large number of filter plates connects adjacent filter plates with a connecting means such as a chain, and all the filter plates are simultaneously tightened by advancing a movable plate. When the movable plate is retracted, all the filter plates are simultaneously opened through the connecting means.

[0003]

Therefore, when the filter plates are opened, all the filter plates are opened simultaneously, so that the larger the number of filter plates, the longer the distance between the filter plates and the longer the filter press. However, there is a problem that the total length is longer.

In order to solve such a problem, a filter press disclosed in Japanese Patent No. 2602606 has been developed.

In this filter press, first, in a first frame opening step, only a group of filter plates is moved to open a filter chamber between a pressed filter plate and a normal filter plate adjacent to one side of the pressed filter plate. Next, only the other group of filter plates is moved to open the filter chamber between the compressed filter plate and the ordinary filter plate adjacent to the other side of the compressed filter plate which was closed in the first frame opening step. It is.

[0006] Thus, the filter plates of one group and the filter plates of the other group are separately opened so as to prevent the total length of the filter press from being lengthened when the frame is opened.

However, although the state can be shifted from the state of the first step to the state of the second step as described above, the state cannot be shifted from the second step to the first step.

[0008] This is because, in the portion where the connecting means is mounted on each filter plate, the mounting portion is connected via the long hole, so that the mounting portion moves in a free state by the length of the long hole, Therefore, although a group of each filter plate can be pulled in one direction by the pulling force of the driving means for driving the filter plates, the force for pushing in the opposite direction does not act on each filter plate.

As a result, the following problem has occurred.

That is, after the dewatered cake is discharged after the first frame opening step, the filter cloth from which the cake has been peeled cannot be immediately washed, and the dewatered cake is discharged and the filter cloth is removed in the second frame opening step. Washing was performed, and thereafter, after all the filter chambers were closed, the state was again set to the first frame opening step, and the filter cloth in the filter chamber opened in the first frame opening step had to be washed.

The reason that washing cannot be performed immediately after the cake is discharged after the first frame opening step is that a conveyor for transferring the discharged cake is provided below the filter chamber, and a pan that can be opened and closed is provided thereon. When washing is performed after discharging the cake after the first frame opening step, washing water remains on the filter plate or the filter cloth,
This is because when the cake is discharged to the tray after the second frame opening step, the washing water remaining on the filter plate or the like also falls to the tray and the water content of the cake increases.

For this reason, when the above-described filter press is used for, for example, tap water sludge, the dehydration step is repeated in each batch for the sake of working efficiency, and the washing is performed after the last batch in one day.

Therefore, although the working efficiency did not decrease so much, for example, in the case of sewage sludge or sludge of industrial waste liquid, it is preferable to alternately repeat the dehydration step and the washing step because the sludge easily adheres to the filter cloth. In this case, when the above-described filter press is used, it takes a long time for washing to dewater a certain amount of sludge.

The present invention has been made in order to solve such a problem, and maintains the conventional advantage that the opening distance of the filter plate is increased and the total length of the filter press is prevented from being increased. Another object of the present invention is to greatly reduce the conventional operation time when dehydration and washing are repeated in a plurality of batches.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made as a method for opening a filter press and a filter press. Is a method of opening a frame between the compressed filter plate 1a and the ordinary filter plate 1b provided with a plurality of pairs, wherein only a group of filter plates is moved to be adjacent to one side of the compressed filter plate 1a and the compressed filter plate 1a. A first frame opening step of opening the filter chamber between the ordinary filter plates 1b, and from the open state in the first frame opening step, only the other group of filter plates is moved and closed in the first frame opening step. The second frame opening step of opening the filter chamber between the compressed filter plate 1a and the ordinary filter plate 1b adjacent to the other side of the compressed filter plate 1a, and from the open state in the second frame opening step, In the second frame opening step, only a group of filter plates is moved in the same direction or the opposite direction as in the first frame opening step. It consists in a third frame opening step of opening the closed filter plate 1a and the frame between the ordinary filter plate 1b adjacent to one side of the compressed filter plate 1a.

The features of the filter press are as follows:
A filter press comprising a plurality of compressed filter plates 1a and ordinary filter plates 1b, wherein only one group of filter plates is moved to
And a first frame opening means for opening the filter chamber between the ordinary filter plates 1b adjacent to one side of the compressed filter plate 1a, and only the other group of filter plates from the open state by the first frame opening means. The second frame for moving to open the filter chamber between the compressed filter plate 1a and the ordinary filter plate 1b adjacent to the other side of the compressed filter plate 1a, which is closed when the frame is opened by the first frame opening means. Means, and from the open state of the second frame opening means, only a group of filter plates is moved in the same direction or the opposite direction as when the filter plate is moved by the first frame opening means, and There is provided a third frame opening means for opening the frame between the compressed filter plate 1a and the ordinary filter plate 1b adjacent to one side of the compressed filter plate 1a, which is closed when the frame is opened.

As means for moving only one group of filter plates in the third frame opening step, means for moving the first movable plate 12 interlocked with one group of filter plates by a pulling force from the rear side of the filter press, For moving the filter plate by the pulling force from the front side of the filter press.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1a denotes a compression filter plate, 1b denotes a normal filter plate, and electrode plates 2a and 2b are provided inside the filter plate.

Reference numeral 3 denotes a diaphragm provided on the compression filter plate 1a side.

4a and 4b are suspended by a filter cloth suspension rod 5 with a pair of filter cloths.

Reference numeral 6 denotes a filter cloth 4a, 4b through the filter cloth suspending rod 5.
And is rotatably mounted on the rotating shaft 7.

The filter cloth can be cleaned with a cleaning liquid from a cleaning nozzle (not shown), and the dewatered cake attached to the filter cloth is peeled off by a peeling roller (not shown).

A plurality of such press filter plates 1a and ordinary filter plates 1b are provided, and are arranged between stands 8 and 9 before and after the filter press as shown in FIG.

The odd-numbered filter plates (mostly the compressed filter plates 1a) from the front side (left side in FIG. 2) are connected to each other by links 10,..., And the rearmost compressed filter plate 1a is the first compressed filter plate 1a. It is fixedly attached to the movable plate 12.

The even-numbered filter plates from the front side (mostly the normal filter plates 1b) are connected to each other by links 11,..., And the rearmost normal filter plate 1b is fixed to the second movable plate 13. It is attached.

Therefore, when the first movable plate 12 retreats, the odd-numbered filter plates (compression filter plate 1a) retreat at the same time, and when the second movable plate 13 retreats, the even-numbered filter plates (the compressed filter plates 1a) retreat. Normally, the filter plate 1b) retreats all at once.

These links are arranged alternately inside and outside, and are connected to the filter plate by pins.

The insertion holes of the pins of each link are elongated in the front-rear direction. When the filter plates are tightened, the filter plates adjacent to each other with the filter cloth interposed therebetween are allowed to be tightened with each other.
When the filter plate is opened, the adjacent filter plates are allowed to open each other at a predetermined interval.

Numeral 14 denotes a hydraulic cylinder as a filter plate driving device, which tightens each filter plate to the front stand 8 side via the first movable plate 12, but when a driving force is applied in the opposite direction, As described above, each filter plate can be retracted via the first movable plate 12.

In FIG. 3, reference numeral 15 denotes a hydraulic jack, and the second movable plate 13 is moved by the elastic force of a spring to the rear stand 9.
To move to the side.

Filtration and dewatering of sludge are performed by the electroosmotic dewatering machine having the above-described configuration. A case in which the frames between the filter plates are opened thereafter will be described below.

First, the first movable plate 12 is moved backward by driving the hydraulic cylinder 14. That is, the first movable plate 12 is moved in the direction of arrow A in FIG.

As a result, the link 10 and the link
The plurality of compressed filter plates 1a,... Connected via... Are also retracted, and each compressed filter plate 1a is adjacent to the compressed filter plate 1a on the front side (the side opposite to the first movable plate). A space is formed between the ordinary filter plates 1b,..., And a frame is opened between the compressed filter plate 1a and the ordinary filter plate 1b (first frame opening step, FIG. 4 (a)).

At this time, with the retraction of the compressed filter plates 1a,..., The ordinary filter plate 1b adjacent to the rear side (the first movable plate side) is also pushed back by the compressed filter plates 1a,.

As described above, the dewatered cake is discharged while the frame between the compressed filter plate 1a and the ordinary filter plate 1b is open.

In this case, the dewatered cake is discharged
Since it is performed only in every other filter room, it is necessary to open the frame of the adjacent filter room next.

That is, when the frame between the filter plates in the closed frame state is opened in the open frame state of FIG.
When the hydraulic jack 15 between the movable plate 12 and the second movable plate 13 is driven, the second movable plate 13 moves backward. That is, the second movable plate 13 moves by the distance x in the direction of arrow a in FIG.

Along with this, the ordinary filter plate 1b connected to the second movable plate 13 by the link 11 retreats, and the compressed filter plate 1a adjacent to the front side (opposite to the movable plate side) of the ordinary filter plate 1b. Are formed at predetermined intervals, and the frame is opened between the compressed filter plate 1a and the ordinary filter plate 1b (second frame opening step, FIG. 4 (b)).

As described above, the ordinary filter plate 1b and the compressed filter plate 1a, which have been closed in the first frame opening step, are opened to form a frame.
The dewatered cake between the opened ordinary filter plate 1b and the compressed filter plate 1a is discharged.

After the dewatered cake is discharged, the filter cloth is washed.

Next, the hydraulic cylinder 14 is driven again to move the first movable plate 12 backward. Thereby, the first movable plate 12
Moves by the distance x in the same direction as that in the first frame opening step (the direction of the arrow A in FIG. 4).

The retreat of the first movable plate 12 causes the first
As in the case of the frame opening step, the links 10, 10,.
Are also retracted.

As a result, the frame between the compressed filter plate 1a and the ordinary filter plate 1b that was opened at the time of the first frame opening step is opened (third frame opening step).

In the third frame opening step, it is possible to wash the filter cloth in the filter chamber between the opened filter plate 1a and the ordinary filter plate 1b.

In the series of steps as described above, as described in the above-mentioned prior art, the force for pushing each filter plate in the direction opposite to the direction a in FIG. 4 does not act.
Although it is not possible to shift to the process, in the present embodiment, the first movable plate is moved in the same direction as in the first process in the third process as described above, so that the compressed filter plate 1a and the ordinary filter plate 1b are moved. , The filter chambers that could not be washed in the second step can be immediately washed in the third step without closing all the filter chambers after the second frame opening step as in the related art.

In the second and third steps as described above, the operation of washing the filter cloth by the washing nozzle and the operation of peeling the cake by the peeling roller are the same as those in the case of a general filter press, and the description thereof is omitted. I do.

In the above embodiment, in the third step, the first movable plate 12 is moved in the same direction as in the first step by the pulling force of the hydraulic cylinder 14 on the rear side of the filter press as in the first step. By doing so, the filter chamber that had been opened during the first step was opened, thereby allowing the filter chamber that could not be washed during the first step to be washed, but from the rear side as in this embodiment. Not limited to the tensile force, the same filter chamber may be opened by the tensile force from the front side of the filter press.

That is, on the front side of the filter press,
As shown in FIGS. 5 and 6, a hydraulic jack 16 is provided which moves to the front side of the filter press by a tensile force, and the compressed filter plates 1a,. By moving the compressed filter plate 1a and the like via the link 11 with the tensile force of a hydraulic jack or the like, it becomes possible to open the same filter chamber as the filter chamber opened in the third step of the above embodiment. .

Further, in this embodiment, the compressed filter plate 1a and the ordinary filter plate 1b are connected to the first movable plate 12 and the second movable plate 13 via a link, and the first movable plate 12 and the Each of the compressed filter plates 1a and the ordinary filter plate 1b is configured to move in conjunction with the movement of the second movable plate 13, but the compressed filter plates 1a and The means for moving the ordinary filter plate 1b in an interlocking manner is not limited to this, and it is also possible to configure so as to be able to interlock with other means.

Further, in the above embodiment, the first movable plate 12
The hydraulic cylinder 14 is used as a means for driving the second movable plate, and the hydraulic jack 15 is used as a means for driving the second movable plate. The means for driving the first movable plate 12 and the second movable plate 13 are the same as those of the present embodiment. The invention is not limited to the hydraulic cylinder 14 and the hydraulic jack 15.

Further, the structure of the filter press is not limited to this embodiment, but can be arbitrarily changed in design.

Further, in the above embodiment, the case where the present invention is used as an electroosmotic dehydrator has been described, but the present invention can be applied to a general filter press other than the electroosmotic dehydrator.

[0054]

As described above, the present invention relates to a filter plate which is positioned at an odd number in the first frame opening step. After moving only the filter plate to open the frame between the compressed filter plate and the ordinary filter plate, only the even-numbered filter plate is moved in the second frame opening process to move the ordinary filter plate closed in the first frame opening process. The frame between the plate and the pressed filter plate is opened, and only the odd-numbered filter plates are moved in the same direction as in the first frame opening process in the subsequent third frame opening process in the same manner as in the first frame opening process. Because it is a method of opening the frame between the plate and the ordinary filter plate, there is no need to perform washing as a state of the first frame opening step again after closing all the filter chambers after the second frame opening step, as in the related art. The filter chamber adjacent to the filter chamber cleaned in the second frame opening step can be immediately cleaned in the third frame opening step, and therefore, the operation of washing after dehydration in the filter chamber can be shortened as compared with the related art. This has the effect.

Incidentally, conventionally, a work time of about 15 minutes was required only in one washing step, but in the present invention,
The work time of about 4 minutes per operation could be reduced by only the washing step.

This is only a reduction of the work time of 4 minutes when only one batch process of dehydration and washing is considered.
Considering the case where a number of batches of dehydration and washing are repeated as one day's work, the work time can be greatly reduced as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view schematically showing a pair of a squeezed filter plate and a normal filter plate of a filter press according to an embodiment.

FIG. 2 is a schematic side view of a filter press as one embodiment.

FIG. 3 is a partially sectional side view showing a driving mechanism of a first movable plate and a second movable plate.

FIG. 4 is a schematic side view schematically showing each frame opening step.

FIG. 5 is a schematic side view schematically showing a third frame opening step of another embodiment.

FIG. 6 is an enlarged schematic plan view of a portion A in FIG. 5;

[Explanation of symbols]

 1a… Compressed filter plate 1b… Normal filter plate 12… First movable plate 13… Second movable plate 14… Hydraulic cylinder

Claims (5)

[Claims] 1. A method of opening a frame between a compressed filter plate (1a) and an ordinary filter plate (1b) provided in a plurality of pairs in a filter press, wherein only a group of filter plates is moved to thereby obtain a compressed filter plate (1a). ) And a first frame opening step of opening the filter chamber between the ordinary filter plate (1b) adjacent to one side of the compressed filter plate (1a), and the other group from the open state in the first frame opening step. The filter chamber between the compressed filter plate (1a) and the ordinary filter plate (1b) adjacent to the other side of the compressed filter plate (1a), which was closed in the first frame opening step by moving only the filter plate of From a second frame opening step of opening the frame, and an open state in the second frame opening step.
The compressed filter plate (1a) and the compressed filter plate (1a) which were closed in the second frame opening step by moving only a group of filter plates in the same direction or the opposite direction as in the first frame opening step. A third frame opening step of opening the frame between the ordinary filter plates (1b) adjacent to one side. 2. A means for moving only a group of filter plates in the third frame opening step, wherein the first movable plate (12) interlocked with the group of filter plates is moved by a pulling force from the rear side of the filter press. 2. The method for opening a frame of a filter press according to claim 1, which is a means for causing the frame to open. 3. The method according to claim 1, wherein the means for moving only one group of filter plates in the third frame opening step is means for moving the filter plates by a pulling force from the front side of the filter press. . 4. A filter press comprising a plurality of compressed filter plates (1a) and a plurality of ordinary filter plates (1b), wherein only a group of filter plates is moved to compress the compressed filter plate (1a) and the compressed filter plate (1a). First frame opening means for opening the filter chamber between the ordinary filter plates (1b) adjacent to one side of 1a), and only the other group of filter plates are moved from the open state by the first frame opening means. The filter chamber between the compressed filter plate (1a) and the ordinary filter plate (1b) adjacent to the other side of the compressed filter plate (1a), which was closed when the first frame opening unit opened the frame, is opened. The second frame opening means and the open state of the second frame opening means move only one group of filter plates in the same direction or the opposite direction as the movement of the filter plates by the first frame opening means, thereby forming the second frame. A third frame opening means for opening a frame between the compressed filter plate (1a) and the ordinary filter plate (1b) adjacent to one side of the compressed filter plate (1a), which is closed when the frame is opened by the frame opening means. Filter Nest. 5. The third frame opening means for moving the filter press by a pulling force from the front side of the filter press.
Filter press as described.