JP2003175304A - Vacuum filter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the uniform and efficient filtering of a slurry and to uniformize and reduce the liquid content of a dehydrated cake while preventing the collapse or scattering of the cake at the time of release of vacuum suction force. <P>SOLUTION: In this vacuum filter apparatus constituted so that the vacuum tray 14 connected to a vacuum suction device is provided under the filter cloth provided to the apparatus main body so as to be capable of running in an almost horizontal direction and the slurry supplied to the upper surface of the filter cloth is sucked under vacuum by the vacuum tray 14 through the filter cloth to be filtered, vacuum suction chambers 19, 19A and 19B allowing vacuum suction force to act on the slurry S from the suction holes bored in the upper surface part 18 of the vacuum tray 14 through the filter cloth 11 are formed to the vacuum tray 14 under the upper surface part 18 of the vacuum tray 14 and connected to the vacuum suction device at a plurality of places, between which an interval is provided, at least in one of the running direction F and width direction of the filter cloth. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum filtration device for filtering a slurry supplied onto a filter cloth which can be moved substantially horizontally by vacuum suction by a vacuum tray provided under the filter cloth. It is about.

[0002]

2. Description of the Related Art As a vacuum filtering device of this type, there are endlessly wound filter cloths around a plurality of rolls provided in the device main body as disclosed in Japanese Patent No. 2707170 and Japanese Patent No. 3091200. In the filtering section, which is capable of intermittently running in the rotating direction, of which the filter cloth on the upper part of the main body of the apparatus is run horizontally, a plurality of vacuum trays are arranged under the filter cloth in the running direction of the filter cloth. What is provided is described. Here, these vacuum trays have a horizontally flat box shape, and a large number of suction holes are formed in the upper surface portion thereof, and the inside of the box shape below the upper surface portion is a vacuum suction device. It is a vacuum suction chamber connected to. Thus, in such a vacuum filtration device, on the filter cloth that is brought into close contact with the upper surface portion of the vacuum tray in the filtration unit, the slurry is supplied on the rear side with respect to the running direction of the filter cloth in the filtration unit, The vacuum suction force generated in the vacuum suction chamber by the vacuum suction device while the filter cloth is stopped while sequentially moving the slurry together with the filter cloth on the vacuum tray in the traveling direction by intermittent running of the filter cloth. Is applied to the slurry from the suction holes on the upper surface of the vacuum tray through a filter cloth, whereby the liquid content of the slurry is sucked and filtered.

[0003]

By the way, in the vacuum filtration device described in the above publication, in each of the plurality of vacuum trays provided in the traveling direction of the filter cloth, the space between each vacuum suction chamber and the vacuum suction device is increased. One suction pipe is connected to each of the vacuum suction chambers. Therefore, one vacuum suction chamber is connected to the vacuum suction device at one location by this one suction pipe. However, the vacuum suction chamber is 1
If it is only connected to the vacuum suction device at a point, a strong vacuum suction force acts on the vacuum suction chamber around this connection point (connection point with the suction tube), and the position above it is high. On the upper surface of the vacuum tray, a strong vacuum suction force acts on the slurry from the suction holes through the filter cloth, while the vacuum suction inside the box-shaped vacuum tray away from this connection point. In the vicinity of the corner of the chamber, a sufficient vacuum suction force does not act on the slurry, and as a result, the dehydrated cake obtained by filtering the slurry locally remains at a high liquid content, and such a liquid content is not sufficiently absorbed. When a uniform cake is further processed in the next step, the processing in the next step may be hindered, and the liquid content of the entire cake itself may be increased.

Further, when the slurry is moved together with the filter cloth on the vacuum tray as described above, the vacuum cutoff valve provided in the suction pipe is closed and the vacuum release valve is opened to perform vacuum suction in the vacuum suction chamber. An operation is performed to release the force and return the inside of the vacuum suction chamber to the atmospheric pressure. At this time, however, it is inevitable that a part of the filtrate or air accumulated in these switching portions flows back into the vacuum suction chamber. However, when the vacuum suction chamber is connected to the vacuum suction device through one suction pipe at one location like the vacuum filtration device described in the above publication, a part of the filtrate or air enters the vacuum suction chamber. Even when backflowing, it will flow back from the connection part of this suction pipe to the vacuum suction chamber all at once, and the impact will destroy the cake formed on the filter cloth located on the upper surface of the vacuum tray around this connection part. There is a risk that cracks will occur and the vacuum suction force will short-pass in subsequent vacuum suction to prevent reliable filtration, or scattering due to collision (digging up) of cake cake.

The present invention has been made under such a background, and it aims at uniform and efficient filtration of a slurry, and also makes the liquid content in the dehydrated cake uniform and reduces it.
Another object of the present invention is to provide a vacuum filtration device capable of preventing the cake from collapsing and scattering due to collision of lumps even when the vacuum suction force is released.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems and to achieve the above object, the present invention provides a vacuum suction under a filter cloth which is provided in the apparatus main body so as to be able to travel substantially horizontally. A vacuum filtration device provided with a vacuum tray connected to the device, wherein the slurry supplied onto the filter cloth is filtered by vacuum suction through the filter cloth by the vacuum tray, and the vacuum tray includes: A vacuum suction chamber is formed under the upper surface of the vacuum tray to apply a vacuum suction force to the slurry from the suction hole formed in the upper surface through the filter cloth. Is connected to the vacuum suction device at a plurality of locations spaced apart in at least one of the running direction and the width direction of the filter cloth. Therefore, in such a vacuum filtration device, the vacuum suction chamber is connected to the vacuum suction device at at least one of the running direction and the width direction of the filter cloth, that is, the vacuum suction apparatus at a plurality of positions spaced in the spreading direction of the filter cloth. Since it is possible to generate a vacuum suction force evenly in this vacuum suction chamber, the vacuum suction force is evenly applied to the slurry from the suction holes on the upper surface of the vacuum tray through the filter cloth, Uniform and efficient filtration can be achieved, and since the reverse flow of filtrate and air when the vacuum suction force is released is also dispersed at the above-mentioned plurality of locations, it is possible to prevent the cake from being impacted. In addition, in order to connect the vacuum suction chamber and the vacuum suction device at a plurality of locations as described above, the vacuum suction chamber may be connected to the vacuum suction device via a suction pipe branched into a plurality of branches.

On the other hand, when a plurality of vacuum trays are arranged in the apparatus main body in the running direction of the filter cloth as described above, the apparatus main body is also provided with a plurality of vacuum suction devices, and some of these vacuum trays are vacuumed. It is desirable to connect the vacuum suction chamber of the tray to a vacuum suction device different from other vacuum suction chambers. This is because when a plurality of vacuum trays are arranged in this way, the vacuum suction chambers of all of these vacuum trays are connected to one vacuum suction device via, for example, a branched suction pipe, and at this time, It is possible to adjust the vacuum suction force of each vacuum suction chamber by installing a pressure control valve on the suction pipe, but in such a case, this vacuum suction device becomes extremely large and it is rather uneconomical. Of course, even if the pressure is adjusted with the pressure adjustment valve, the vacuum suction force balances between the vacuum suction chambers while the filtration work is continued, and the readjustment is often forced. While there is a possibility that work efficiency may be deteriorated, the apparatus main body is provided with a plurality of vacuum suction devices as described above, and some vacuum suction chambers of the plurality of vacuum trays are different from other vacuum suction devices. When linked to Although the number of vacuum suction devices increases, each vacuum suction device can be economical because it can use a relatively small general-purpose product, and the vacuum suction force of each vacuum suction chamber can be stabilized. At the same time, the adjustment becomes easy.

[0008]

1 to 7 show an embodiment of the present invention. In the vacuum filtration device of this embodiment, the endless belt-shaped filter cloth 11 is provided in the device body 10.
Are sequentially wound around a plurality of rolls 12, and the upper portion of the filter cloth 11 is arranged so as to extend in the horizontal direction to form a filter portion 11A. And this filter cloth 11
Is a filter cloth drive device 13 provided at the bottom of the device body 10.
As a result, the filter unit 11A travels from one end side (left side in FIG. 1) to the other end side (right side in FIG. 1) in the traveling direction indicated by the arrow F in the drawing.
1 is intermittently rotated clockwise in FIG. 1 and a vacuum tray 14 is provided below the filtering portion 11A of the filter cloth 11, and a device is provided above the filtering portion 11A. A supply device 15 for the slurry S is provided on the one end side of the main body 10, and the slurry S supplied from the supply device 15 onto the filter cloth 11 on the vacuum tray 14 is
While being moved in the traveling direction F as the filtering unit 11A is traveling, the vacuum tray 14 vacuum-sucks through the filter cloth 11 to filter, and is discharged as a dehydrated cake from the other end on the traveling direction F side. Has been done.

As shown in FIG. 1, the filter cloth driving device 13 has an arm 13A which is rotatable around a swing axis parallel to the rotation axis of the rolls 12 ... Is provided so that it can be swung at a predetermined angle around the swing axis by a driving means 13B such as a cylinder device attached to the device body 10. This clamper 13C is equipped with
The filter cloth 11 is sandwiched by and the arm 13A is swung in one direction by the driving means 13B, so that the filter cloth 11 is rotated in a predetermined stroke to cause the filter portion 11A to travel in the traveling direction F. With the clamper 13C separating the filter cloth 11, the arm 13A is swung in the direction opposite to the one direction, whereby the arm 13A is returned to the original position without pulling back the filter cloth 11. By repeating such operations, the filter cloth 11 is intermittently driven to rotate, and the filter portion 11A is also intermittently run. It should be noted that the adjusting roll 16 wound around the filter cloth 11 is provided on the lower part of the one end side of the apparatus body 10.
A tension adjusting device 16 for the filter cloth 11 is provided, which is equipped with A and is also made swingable by a driving means 16B such as a cylinder device.

In the vicinity of the roll 12 located on the running direction F side (the other end side) of the filtering unit 11A, the slurry S supplied on the filtering unit 11A and filtered by the vacuum tray 14 is provided. A knife 10A that scrapes off the dehydrated cake from the filter cloth 11 and removes it is provided in the apparatus main body 10, and the dehydrated cake that is removed by the knife 10A has a paddle provided below it at the most other end side of the apparatus main body 10. It is accommodated in the mold conveyor 10B and discharged. Further, on the other end side of the lower part of the apparatus main body 10, the dehydrated cake was peeled off between the filter 12 and the roll 12 on the running direction F side of the filtering portion 11A in the loop path of the filter cloth 1. A filter cloth cleaning device 17 for cleaning the subsequent filter cloth 11 is provided. Here, the filter cloth cleaning device 17 is connected to a cleaning water supply device (not shown) in a cleaning box 17A provided in the lower part of the apparatus main body 10 so that the filter cloth 11 can pass therethrough, and the cleaning water is directed toward the filter cloth 11. The cleaning pipe 17B for injecting is provided so as to be able to advance and retreat in the passage direction of the filter cloth 11 passing through the inside of the cleaning box 17A. In particular, in the present embodiment, the cleaning pipe 17B is the filter cloth drive device 13 Is connected to the arm 13A of the arm 13A and is movable forward and backward integrally with the swing of the arm 13A by the driving means 13B.
By adjusting the speed at which A returns to the original position, the filter cloth 11 is reliably washed.

On the other hand, the vacuum tray 14 is composed of a plurality (eight in this embodiment) of vacuum trays 14A to 14H arranged in the traveling direction F in this embodiment. These vacuum trays 14A to 14H have substantially equal lengths in the running direction F and have the same stroke of intermittent running of the filter cloth 11, and the filter cloth 1
1 has the same width along the width direction (vertical direction in FIG. 2, left-right direction in FIGS. 3 to 5), and has substantially the same shape and size, and is attached to and detached from the apparatus body 10 in this embodiment. Possibly installed and fixed. Each of the vacuum trays 14 is in the shape of a box that is flat in the vertical direction and is flat in the horizontal direction, and its upper surface portion 18 has a wide flat portion 18A having a horizontal central portion in the width direction of the filter cloth 11. At both sides in the width direction, the wall portions 18 that are inclined upward toward the outside in the width direction are provided.
B and 18B are formed with a width smaller than that of the flat portion 18A, and the flat portion 1 is formed between the vacuum trays 14A to 14H.
8A and the wall portions 18B, 18B are arranged so as to be flush with each other in the traveling direction F, and the filter cloth 11 is provided in the filter portion 11A.
The center portion in the width direction is superposed on the flat portion 18A, and both side portions are brought into close contact with the upper surface portion 18 so as to ride on these wall portions 18B, 18B and run in the running direction F. Therefore, the slurry S supplied onto the filter cloth 11 also passes through the filter cloth 11 on both sides of the vacuum tray 14 and these wall portions 18B, 18B.
As a result of being deposited on the upper surface, a cross section orthogonal to the traveling direction F has an isosceles trapezoidal shape that is flat and flat in the width direction.

Further, the inside of the box shape formed by the vacuum tray 14 is an air-tight and liquid-tight vacuum suction chamber 19 which is connected to a vacuum suction device such as a vacuum pump (not shown). Each vacuum tray 14A-14H
Isolated from each other. Further, the upper surface portion 18 is provided with a large number of suction holes communicating with the vacuum suction chamber 19, and the slurry S on the upper surface portion 18 via the filter cloth 11 adhered to the upper surface portion 18 through the suction holes. Vacuum suction chamber 1
The slurry S can be vacuum-sucked as described above by applying a vacuum suction force from 9 and is located on the traveling direction F side of the filter cloth 11 in the vacuum trays 14A to 14H in the present embodiment. In the vacuum trays 14F to 14H
The slurry S can be vacuum-sucked from the wall portion 18B of the upper surface portion 18 through the filter cloth 11.

That is, in this embodiment, the vacuum suction chamber 19 of each vacuum tray 14 extends from below the flat portion 18A at the center of the upper surface portion 18 to below the wall portions 18B, 18B on both sides. It is provided, but flat part 1
The lower portion of 8A and the lower portions of both wall portions 18B, 18B are separated by, for example, a partition wall 19C shown in FIG. Then, the plurality of vacuum trays 14A to 14
Of H, the traveling direction F of the filter cloth 11 in the filter unit 11A
In a plurality of (a majority of five in this embodiment) vacuum trays 14A to 14E on the rear side (one end side), only the vacuum suction chamber 19 below the flat portion 18A of the upper surface portion 18 is vacuum-sucked. Therefore, only the lower part of the flat portion 18A functions as a vacuum suction chamber 19 and is connected to the apparatus, and the slurry S is vacuumed through the filter cloth 11 from the suction holes formed in the flat portion 18A. While a suction force is applied, a plurality of the remaining part of the traveling direction F side (the other end side) (in the present embodiment, less than a majority of three) of the vacuum trays 1
In 4F to 14H, the portion below the flat portion 18A and the wall portion 18
The lower part of B and 18B is connected to a vacuum suction device,
As shown in FIGS. 5 and 6, these portions function as the vacuum suction chamber 19A and the vacuum suction chambers 19B and 19B, respectively. Further, as shown by the line P in FIG. The flat portion 18A is also bored in the wall portion 18B, and a vacuum suction force is applied to the slurry S from the suction holes bored in the wall portion 18B through the filter cloth 11 so that the slurry S is vacuum sucked. It is possible. Moreover, in the present embodiment, the vacuum suction chamber 19A and the vacuum suction chambers 19B, 19B are connected to different vacuum suction devices, and thereby act on the slurry S from the wall portion 18B through the filter cloth 11. The vacuum suction force and the vacuum suction force acting from the flat portion 18A of the upper surface portion 18 on the inner side in the width direction of the wall portion 18 can be controlled to different strengths, and the vacuum tray on the traveling direction F side can be controlled. 14F-14
At H, the vacuum suction force acting on the slurry S from the wall portion 18B is made stronger than the vacuum suction force acting on the flat portion 18A.

On the other hand, the vacuum suction chamber 19 of the vacuum tray 14
(19A, 19B) and the vacuum suction device are connected by suction pipes 20A to 20D arranged laterally below the vacuum trays 14A to 14H from the side of the apparatus main body 10. However, of these, the vacuum suction chamber 1 of the two vacuum trays 14A and 14B on the rear side in the traveling direction F
9 and 19 are connected by a common suction pipe 20A, and the vacuum suction chambers 19, 19 of the next two vacuum trays 14C and 14D on the traveling direction F side are also connected by a common suction pipe 20B. Further, in the four vacuum trays 14E to 14H on the traveling direction F side, the vacuum suction chamber 19 of the vacuum tray 14E and the vacuum suction chamber 19A of the vacuum trays 14F to 14H are also connected by the common suction pipe 20C, while Vacuum suction chamber 19 of trays 14F to 14H
B and 19B are also connected by a common suction tube 20D, and the apparatus main body 10 is equipped with a plurality (four) of vacuum suction apparatuses, and these suction tubes 20A to 20D are connected to different vacuum suction apparatuses. Has been done. Therefore, in this embodiment, a part of the vacuum suction chambers 19 (19A, 19B) of the plurality of vacuum trays 14A to 14H arranged side by side in the running direction F of the filter cloth 11 is different from the other vacuum suction chambers. Will be connected to the device, and the vacuum tray 14
The vacuum suction chamber 19A and the vacuum suction chamber 19 of E to 14H
B and 19B are also connected to different vacuum suction devices as described above.

Of these, the suction tube 2 connected to the vacuum suction chambers 19 and 19A located below the upper surface 18A.
0A to 20C are branched into two in the suction tubes 20A and 20B and four in the suction tube 20C in accordance with the number of the vacuum trays 14 to be sucked, and respectively in the central portions of the vacuum trays 14A to 14H in the traveling direction F. After extending in the width direction, in the three portions of the central portion of the flat surface portion 8A in the width direction and the portions equally spaced on both outer sides thereof,
Also in the traveling direction F, each of the vacuum trays 14A to 13A is branched into three portions, that is, the center of the flat surface portion 8A of each vacuum tray 14 and a portion at equal intervals on the traveling direction F side and the traveling direction F rear side. A vacuum suction chamber 19 vertically from below 14H,
19A and thus each vacuum tray 14
The vacuum suction chambers 19 and 19A of the
The suction pipes 20 </ b> A to 20 </ b> C will be connected at a plurality of points (a total of nine points in each of three points in the present embodiment) equally spaced apart from each other. On the other hand, the suction pipe 20D connected to the vacuum suction chamber 19B of each of the vacuum trays 14F to 14H also has a traveling direction F.
At the vacuum tray 14 from between the suction tubes 20B and 20D.
After being extended to the center portion in the width direction, it is branched to both outer sides in the width direction and extended below the vacuum suction chambers 19B, 19B, and further bent in the traveling direction F. The vacuum suction chambers 19 extend in parallel to each other in the traveling direction F and are located on both sides of each of the vacuum trays 14F to 14H.
It is also vertically connected to B and 19B from below. The suction tube 20D is used for each of the vacuum trays 14F to 14F.
The vacuum suction chambers 19B and 19B of H are connected at a plurality of positions at equal intervals in the traveling direction F.

Each of the suction pipes 20A to 20D is provided with a vacuum shutoff valve 21 such as a butterfly valve at the connection portion with the vacuum suction device side, and the vacuum tray 14 side of the vacuum shutoff valve 21 is also on the vacuum tray 14 side. A vacuum opening pipe 23 having a vacuum opening valve 22 such as a butterfly valve is provided so as to extend vertically upward, and an air filter 24 is attached to an upper end portion of the vacuum opening pipe 23. Here, as shown in FIG. 1, the vacuum open tube 23 is a suction tube 20A, 2
In 0B, these are provided at the branching portion that branches into two, while in the suction pipe 20C that branches into four, they are provided at the shoulder between the branching portions of the vacuum trays 14E and 14F. Further, in the suction tube 20D,
Vacuum suction chambers 18B, 18 of the vacuum trays 14A to 14H
The front pipe branching to B is provided in one part.

Further, as shown in FIG. 7, the air filter 24 is installed in a bottomed cylindrical cover 24B which is detachably attached to the upper end of the vacuum open tube 23 with the opening facing downward by a thumbscrew 24A. A filter element 24C, which is obtained by bending a sheet woven of polyester fiber or the like into a bellows shape and wound in a cylindrical shape, has a space between the filter element 24C and the inner circumference of the cover 24B, and the outer circumference rather than the opening of the vacuum release tube 23 The filter element 24C is disposed so as to be located on the side, and the upper and lower end portions of the filter element 24C are the cover 2
4B and the annular bottom plate 24D arranged on the outer circumference of the opening of the vacuum open tube 23 are closed, and an annular opening is made between the outer circumference of the bottom plate 24D and the lower end of the cover 24B. ing. Thus, in this embodiment,
When the filter cloth 11 travels after vacuum suction in each vacuum tray 14, the vacuum cutoff valve 21 is closed and then the vacuum release valve 22 is opened to suck the cover 24B from the outer peripheral side of the lower end portion. The air that has passed through the bellows-shaped peripheral wall of the filter element 24C passes through the vacuum open pipe 23 and the suction pipes 20A to 20D, and the vacuum suction chamber 19 (19).
A, 19B), and the pressure in the vacuum suction chamber 19 is returned to atmospheric pressure.

Further, the supply device 15 for the slurry S provided on the one end side above the filtration portion 11A is driven by the drive means 25 such as an air cylinder provided in the main body 10 of the apparatus in the present embodiment, so that the traveling direction is changed. It is possible to move back and forth toward F. Here, the supply device 15 is capable of advancing and retracting within the range where the vacuum tray 14A is provided in the traveling direction F on the vacuum tray 14A on the one end side of the vacuum tray 14 which is the rearmost side in the traveling direction F. There is. On the other hand, on one of the three vacuum trays 14C to 14E located on the traveling direction F side of the vacuum tray 14A,
Cleaning devices 26A to 26C for supplying the cleaning liquid L to the cake in which the slurry S located on the vacuum trays 14C to 14E has been suction-filtered to clean the cake are respectively provided, and these cleaning devices 26A to 26C are also provided. The vacuum trays 16C to 16E can be moved forward and backward in the traveling direction F in a range where the vacuum trays 16C to 16E are provided. Further, in the present embodiment, the cleaning devices 26A to 26C are different from the driving device 25 of the supply device 15 in that the driving device 2 such as another air cylinder is used.
7, so that the supply device 25 and the cleaning devices 26A to 26C can move forward and backward independently of each other in the traveling direction F.

The cylinder device such as the air cylinder which constitutes the driving means 25 of the supply device 15 is attached to the device main body 10 such that the cylinder rod thereof is projected and retracted toward the running direction F side of the filter cloth 11. The supply device 15 is attached to the tip of this cylinder rod and can move back and forth. On the other hand, the cleaning device 26
The cylinder device constituting the driving means 27 of A to 26C is provided so as to project and retract the cylinder rod on the rear side in the traveling direction F contrary to the driving means 25, and the cleaning devices 26A to 26C are connected to each other. In the embodiment, they are connected to each other and can be integrally moved back and forth by this one drive means 27. The heights of the supply ports of the cleaning liquid L of the two cleaning devices 26B and 26C on the traveling direction F side are equal to each other and lower than the position of the supply port of the cleaning device 26A on the rear side of the traveling direction F. There is.

Therefore, in the vacuum filtration device thus constructed, the vacuum suction chamber 19 or the vacuum suction chambers 19A and 19B of each vacuum tray 14 is provided with a vacuum suction device, and a plurality of suction pipes 20A to 20D connecting them are provided. By branching into the vacuum suction chambers 19, 19A, 19B, the vacuum suction chambers 19, 19A, 19B are connected at a plurality of points in the traveling direction F and the width direction of the filter cloth 11. ，
It is possible to evenly generate a vacuum suction force in 19B and to apply a uniform vacuum suction force to the slurry S from the upper surface portion 18 of the vacuum tray 14 through the filter cloth 11.
Moreover, these suction pipes 20A to 20D are provided at a plurality of locations at equal intervals on both sides of the center of the filter cloth 11 in the traveling direction F of the filter cloth 11, and in the vacuum suction chambers 19 and 19A, in the width direction of the filter cloth 11. Is also connected to the both sides of the vacuum suction chamber 19 at equal intervals on both sides of the central portion.
The vacuum suction force is evenly generated in 19A and 19B, whereby the vacuum suction force can be applied to the slurry S more uniformly, and the non-uniform liquid content is generated in the dehydrated cake. It can be prevented more reliably. In addition, the vacuum suction chambers 19, 19A, 19B are connected at a plurality of points by the suction pipes 20A to 20D branched into a plurality of branches, so that the vacuum shutoff valve 21 is closed when the filter cloth 11 is moved together with the slurry S. When the vacuum release valve 22 is opened, the filtrate and air are collected in the vacuum suction chamber 19,
Even if it flows back to 19A and 19B, since these are dispersed at the above-mentioned plurality of connection points, the impact given to the cake formed on the filter cloth 11 is small, and the cake collapses and the cake lumps collide (dig up). It is possible to prevent scattering due to. In the present embodiment, the connection points of the suction pipes 20A to 20C in the vacuum suction chambers 19 and 19A are arranged in a grid pattern in a plan view, but they may be arranged in a staggered pattern. On the contrary to the vacuum suction chamber 19B, when the vacuum suction chamber is long in the width direction of the filter cloth and short in the traveling direction, the vacuum suction chamber may be connected to the vacuum suction device at a plurality of positions only in the width direction.

Further, in this embodiment, the vacuum trays 14A and 14B and the vacuum tray 1 among these vacuum trays 14 are used.
4C and 14D are connected to different suction tubes 20A and 20B, and also in the vacuum trays 14E to 14H,
The vacuum suction chambers 19, 19A and the vacuum suction chambers 19B are connected to different vacuum suction devices, that is, the vacuum suction chambers 19, 19A, 1 provided in the plurality of vacuum trays 14.
Some of the plurality of vacuum suction devices provided in the apparatus main body 10 among the plurality of 9B are other vacuum suction chambers 19, 19A, 19B.
It is connected to a vacuum suction device different from B. However, at this point, for example, the apparatus main body is provided with only one vacuum suction device, all the vacuum suction chambers of all the vacuum trays are connected to this one vacuum suction device, and the pressure adjusting valve is provided in the suction pipe between them. Although it is possible to adjust the vacuum suction force of each vacuum suction chamber by providing, for example, in such a case, this vacuum suction device may become extremely large and rather uneconomical. Of course, even if the pressure is adjusted by the pressure adjusting valve, the vacuum suction force is balanced between the vacuum suction chambers during the filtration work, and the readjustment is often forced to deteriorate the work efficiency. On the other hand, in the vacuum filtration device of the present embodiment adopting the above configuration, the slurry S is supplied on the rear side in the traveling direction F, the cake is formed, and the cake is washed by the subsequent washing devices 26A to 26C. And in the running direction F side vacuum tray 14F
It is possible to surely apply the final dehydration filtration by ~ 14H and the vacuum suction force suitable for each step to the slurry S.

In addition, in the present embodiment, the plurality of vacuum suction devices and the vacuum suction chambers 19, 19A and 19B of the plurality of vacuum trays 14A to 14H are respectively provided from one vacuum suction device. Are connected to each other by suction pipes 20A to 20D branched from each other, and each suction pipe 20A to 20D is connected to an individual vacuum suction chamber 19, 19A, 19
Since B is branched into a plurality of branches and connected at a plurality of locations as described above, it is possible to avoid an increase in the number of vacuum suction devices, and to balance economic efficiency and work efficiency. The advantage that is possible is also obtained. In addition,
In this embodiment, these vacuum trays 14 are used as the apparatus main body 10.
The vacuum filtration device, which is fixed to the filter cloth 11 so that the filter cloth 11 runs intermittently, has been described. For example, the filter cloth can run continuously and the vacuum tray can advance and retreat in a certain stroke in the running direction of the filtering section. It is of course possible to apply the present invention to such a vacuum filtration device.

On the other hand, in the vacuum filtration device of this embodiment, as described above, the vacuum suction chamber 19 of the vacuum tray 14 is the filter cloth 1
In the vacuum trays 14F to 14H on the traveling direction F side of
From the bottom of the flat portion 18A in the center of the upper surface portion 18 to the wall portions 1 on both sides
In addition to being extended to 8B and 18B, suction holes are also bored in these wall portions 18B and 18B, so that a vacuum suction force can be applied to the slurry S also from these wall portions 18B. Therefore, it becomes possible to reliably perform the dehydration filtration of the slurry S deposited on the wall portion 18B, which is difficult only by the vacuum suction from the flat portion 18A. Therefore, as described above, the vacuum suction chambers 19 and 19A are provided. , 19B and the vacuum suction device are connected at a plurality of locations, the dehydrated cake of the slurry S that has been dehydrated and filtered has a locally high liquid content, and a portion with a non-uniform liquid content may be generated. It is possible to more reliably prevent this from occurring, and it is possible to further reduce the liquid content of the entire cake. Due to such an uneven liquid content of the cake and insufficient dehydration filtration, smooth operation in the next step is possible. It is possible to prevent the treatment from being hindered and to improve the efficiency of the treatment in the next step.
Moreover, in the present embodiment, in the vacuum trays 14F to 14H for performing the final dehydration filtration of the slurry S after the vacuum trays 14C to 14E provided with the cleaning devices 26A to 26C in the traveling direction F of the filter cloth 11. As described above, since the slurry S can be vacuum-sucked from the wall portion 18B, that is, the vacuum suction can be performed from the wall portion 18B only in a necessary portion, the number of vacuum suction devices can be increased and vacuum suction can be performed. The dehydration filtration of the slurry S on the wall portion 18B can be efficiently performed as described above without increasing the force. However, of course, it does not matter if the vacuum trays 14A to 14E can be suctioned to the rear side in the traveling direction F or from the wall portion 18B if necessary.

Further, particularly in this embodiment, in the vacuum trays 14F to 14H on the traveling direction F side for performing the final filtration of the slurry S as described above, the vacuum trays 14F to 14H are formed below the flat portion 18A at the center of the upper surface portion 18 thereof. Vacuum suction chamber 19A and wall 18
Vacuum suction chambers 19B and 19B formed below B and 18B
Are separated from each other by a partition 19C, and are connected to different vacuum suction devices via suction pipes 20C and 20D different from each other. These vacuum suction devices allow the slurry to be slurried from the respective vacuum suction chambers 19A and 19B through the filter cloth 11. The vacuum suction force acting on S can be controlled to different strengths. And, of these, the vacuum suction chamber 19 on the wall portion 18B side
The vacuum suction force acting on the slurry S from B is generated by the flat portion 18
Since it is made stronger than the vacuum suction force that acts on the slurry S from the vacuum suction chamber 19A on the A side, according to the present embodiment, the wall portion 1 in which efficient dehydration filtration is difficult as described above.
The slurry S deposited on 8B can be reliably filtered, the dehydration efficiency can be further improved and the liquid content can be made uniform, and the plurality of vacuum trays 14 can be used.
Of these, since the vacuum suction force is controlled to have different strengths at the stage where the dehydrated cake is finally formed on the running direction F side of the filter cloth 11, a smoother smoothing of the process in the next step,
It is possible to promote efficiency.

In this embodiment, the wall portion 18 is
The vacuum suction force acting from the vacuum suction chamber 19B on the B side is made stronger than the vacuum suction force by the vacuum suction chamber 19A on the flat portion 18A side, but the thickness of the slurry S becomes thin depending on the properties of the slurry S. If a high vacuum suction force is applied to the wall portion 18B, the dehydrated cake may be cracked and the vacuum suction may short-pass. In such a case, the vacuum suction force from the vacuum suction chambers 19A and 19B is reduced. To be approximately equal to each other, or conversely to the above, the flat portion 18
The vacuum suction force from the vacuum suction chamber 19A on the A side is applied to the wall portion 18B.
It may be made stronger than the vacuum suction force from the vacuum suction chamber 19B on the side. In addition, in the present embodiment, particularly when the vacuum suction chambers 19A and 19B are isolated from each other, one vacuum suction chamber 19 is extended to below the wall portions 18B and 18B, and then the partition wall 19C is provided. Although the vacuum suction chambers 19A and 19B have the advantage of being easy to form, they are located below the flat portion 18A of the upper surface portion 18 and the wall portion 1.
Separate box-shaped vacuum suction chambers 19A and 19B may be formed below 8B and 18B, respectively.

On the other hand, in this embodiment, this vacuum tray 1 is used.
4, a supply device 15 for supplying the slurry S to the filter cloth 11 on the vacuum tray 14A on the rear side of the traveling direction F, and the filter cloths 11 of the vacuum trays 14C to 14E located on the traveling direction F side of the vacuum tray 14A. Cleaning devices 26A to 26A for supplying a cleaning liquid to the cake of the upper slurry S to clean the cake
6C and 6C can move forward and backward independently of each other in the traveling direction F. However, in this respect, the above-mentioned Japanese Patent No. 27071
In the vacuum filtration device described in Japanese Patent Publication No. 70 and Japanese Patent Publication No. 3091200, since the slurry supply device and the cleaning device are made to advance and retreat integrally, the slurry supply and the cake cleaning are performed. According to the present embodiment, on the other hand, the supply device 15 and the cleaning devices 26A to 26C are not synchronized with each other, but are advanced and retreated with different time charts to supply the slurry S and the cake. It can be washed. That is, for example, the slurry S is supplied by slowly moving the supply device 25 in one direction toward the traveling direction F side or its rear side while the filter cloth 11 is stopped, and the slurry S is evenly distributed on the filter cloth 11. The slurry S is supplied with a uniform thickness to return the supply device 25 to the original position while the filter cloth 11 is running, while the cleaning devices 26A to 26C are also used.
While the filter cloth is stopped, the filter cloth can be moved back and forth once or more at a uniform speed to supply a sufficient cleaning liquid to the cake obtained by filtering the slurry S to ensure reliable cleaning.

Therefore, according to such a vacuum filtration device, the supply of the slurry S by the supply device 15 and the cleaning of the cake by the cleaning devices 26A to 26C are made independent from each other in this way, and the device 1 is provided with a time chart suitable for each.
By advancing and retracting 5, 26A to 26C, the feeding device 1 is moved by advancing and retracting the cleaning devices 26A to 26C as in the conventional case.
The forward / backward movement of 5 is restrained, so that the slurry S cannot be spread evenly on the filter cloth 11, or conversely, the cleaning device 2
It is possible to prevent a situation in which the forward / backward movement of 6A to 26C is restrained by the forward / backward movement of the supply device 15 and it becomes impossible to sufficiently supply the cleaning liquid L to the dehydrated cake of the slurry S. Slurry S with uniform thickness
The cleaning liquid L can be sufficiently supplied to the dehydrated cake having a uniform thickness by the slurry S thus supplied to perform cleaning. And, by doing so, it is possible to prevent uneven washing or partially insufficient filtration in the finally obtained dehydrated cake, and to obtain a cake that has a uniform liquid content and is sufficiently washed. Becomes

Moreover, in this embodiment, when the supply device 15 and the cleaning devices 26A to 26C are independently advanced and retracted as described above, individual drive means 25 and 27 are connected to each other to drive them forward and backward. That is, the supply device 15 and the cleaning devices 26A to 26C can be moved back and forth by independent drive means 25 and 27. However,
In this respect, for example, the drive means is common to both devices,
It is possible to separately advance and retreat the supply device and the cleaning device by interposing a link mechanism or the like between them, but in such a case, the link mechanism becomes complicated, and both the supply device and the cleaning device are complicated. If one of the time charts is to be changed, this link mechanism must be replaced, and the work is inevitably complicated, while the supply device 15 and the cleaning devices 26A to 26A.
According to the vacuum filtration device of the present embodiment in which the driving means 25 and 27 of 26C are also independent of each other, even when the time chart is changed, the changing devices 15 and 26A to
Only the driving means 25 and 27 of 26C need to be controlled accordingly, and the operation is easy, and the time chart can be changed in a short time.

Furthermore, in the present embodiment, the suction pipe 20A connecting the vacuum tray 14 and the vacuum suction device.
The air filter 24 is attached to the vacuum release tube 23 provided in the vacuum release valve 2 to 20D.
It is possible to remove dust and dirt in the air flowing into the vacuum suction chambers 19, 19A and 19B when opening 2 to prevent the filtrate filtered from the slurry S from being contaminated with the dust and dirt. In addition, it is possible to prevent a large noise from being generated when the vacuum release valve 22 is opened.
That is, when the vacuum suction in each vacuum tray 14 is completed, the vacuum release valve 22 is opened to return the inside of the vacuum suction chambers 19, 19A, 19B to the atmospheric pressure as described above.
After that, the filter cloth driving device 13 causes the filter cloth 11 to travel, but in order to shorten the time and improve the efficiency of the work, the vacuum opening valve 22 must be opened all at once. At that time, air also inflows from the vacuum open pipe 23 at once, and unless the diameter of the pipe is made large, it is inevitable that a large noise is generated. However,
On the other hand, by providing the air filter 24 as in the present embodiment, the inflowing air receives resistance when passing through the filter element 24C and the inflow speed is reduced, so that such noise can be suppressed. It will be possible. Further, in the present embodiment, since the cover 24B of the air filter 24 is removable, there is also an advantage that maintenance of the filter element 24C and the like are easy.

[0030]

As described above, according to the vacuum filtration device of the present invention, one vacuum suction chamber of the vacuum tray is vacuum suction device at a plurality of locations spaced in the running direction and width direction of the filter cloth. By connecting with the vacuum suction chamber, a uniform vacuum suction force can be generated in this vacuum suction chamber, and a uniform vacuum suction force can be applied to the slurry. To prevent the liquid content from becoming uneven and the dehydration efficiency itself to be impaired to increase the liquid content of the dehydrated cake, and to achieve uniform and efficient filtration of the slurry. Therefore, even when this dehydrated cake is treated in the next step, it is possible to prevent a situation in which this treatment is hindered, it is possible to promote smooth and stable treatment, and the cake collapses. And scattered Gukoto can. Further, by connecting this vacuum suction chamber to the vacuum suction device via a suction pipe branched into a plurality of branches, it is possible to achieve both filtration efficiency and economical efficiency, and further a plurality of vacuum trays are arranged. In this case, the device body also has multiple vacuum suction devices,
By connecting the vacuum suction chamber of some vacuum trays to a vacuum suction device that is different from other vacuum suction chambers, it is possible to further improve economic efficiency and stabilize the vacuum suction force, and Adjustment can be facilitated.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a vacuum filtration device of the present invention.

FIG. 2 is a plan view of the vacuum tray 14 of the embodiment shown in FIG.

FIG. 3 is a sectional view taken along line XX in FIG.

FIG. 4 is a sectional view taken along line YY in FIG.

5 is a cross-sectional view taken along the line ZZ in FIG.

6 is an enlarged sectional view of a side portion of the vacuum tray 14 in FIG.

7A is a partially cutaway side view showing the air filter 24 of the embodiment shown in FIG. 1, and FIG. 7B is a transverse sectional view of a filter element 24B.

[Explanation of symbols]

10 Device body 11 filter cloth 11A Filter section 13 Coating drive 14 (14A-14H) Vacuum tray 15 Supply device 18 Top surface of vacuum tray 14 18A Flat part in the center of the upper surface 18 18B Upper surface part 18 side wall part 19, 19A, 19B Vacuum suction chamber 20A-20D suction tube 24 air filter 26A-26C cleaning device F Running direction of filter cloth 11 S slurry L cleaning liquid

Claims (3)

[Claims] 1. A vacuum tray connected to a vacuum suction device is provided under a filter cloth provided on the apparatus main body so as to be able to travel substantially horizontally, and the slurry supplied onto the filter cloth is provided by the vacuum tray. A vacuum filtration device for filtering by vacuum suction through the filter cloth, wherein the vacuum tray has a suction hole formed under the upper surface of the vacuum tray, and the filter cloth is suctioned through the suction hole. A vacuum suction chamber for applying a vacuum suction force to the slurry is formed through the one vacuum suction chamber, and one vacuum suction chamber is provided at a plurality of locations spaced in at least one of the running direction and the width direction of the filter cloth. In the above, a vacuum filtration device connected to the above vacuum suction device. 2. The vacuum filtration device according to claim 1, wherein the vacuum suction chamber is connected to the vacuum suction device via a suction pipe branched into a plurality of branches. 3. The apparatus main body is provided with a plurality of the vacuum trays directed in a running direction of the filter cloth,
A plurality of the vacuum suction devices are provided, and the vacuum suction chamber of some of the vacuum trays is connected to the vacuum suction device different from other vacuum suction chambers. The vacuum filtration device according to claim 1 or claim 2.