JP3026062B2 - Vacuum filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum filtration apparatus mainly used in the fields of organic / inorganic chemistry, food and pharmaceutical industries, for dehydrating and filtering an object to be treated which has been solid-liquid separated from a mixture. .

[0002]

2. Description of the Related Art A vacuum filtration apparatus of this type includes an endless filter cloth wound between a plurality of rolls and capable of rotating in a predetermined traveling direction. There is generally known a so-called horizontal vacuum filtration apparatus in which an object to be processed supplied on a filter cloth at a portion to be filtered is vacuum-filtered by a vacuum box provided below the filter cloth.

FIG. 9 shows an example of a conventional horizontal vacuum filter of this type, in which a filter cloth 1 is composed of a plurality of rolls 2.
… And endless, and its upper center is stretched so as to extend in the horizontal direction. Inside the wound filter cloth 1, a grooved endless rubber belt 3 is wound around a pair of rolls 4 and 4, and its upper part is located at the upper center of the filter cloth 1. It is made to adhere to the lower surface. Further, a vacuum box 5 connected to a suction means such as a vacuum pump (not shown) is provided on the inner side of the wound rubber belt 3 so as to be in close contact with the upper central lower surface of the rubber belt 3. Further, one of the rolls 4 and 4 is connected to a driving means such as a motor 6, and the driving means rotates the roll 4 so that the rubber belt 3 rotates. In the traveling direction indicated by the arrow A of FIG.

Further, above the horizontal portion at the upper center of the filter cloth 1, supply means for supplying the object to be processed P onto the filter cloth 1 behind the filter cloth 1 in the running direction A. 7 is provided above the vacuum box 5 on the side of the traveling direction A with pressing rolls 8 for squeezing the workpiece P. However, in the vacuum filtration device having such a configuration, the processing object P supplied from the supply means 7 is vacuum-suctioned through the grooved rubber belt 3 on the vacuum box 5 and filtered by the filter cloth 1. At the same time, the pressing belts 8 press the rubber belt 3 to squeeze it, thereby further promoting dehydration.

On the other hand, FIG. 10 shows an example of another conventional vacuum filtration device. In this example, the vacuum box 5 is placed directly below the horizontal portion of the filter cloth 1 without passing through the rubber belt 3. The filter cloth is provided so as to be in direct contact with the filter cloth 1. Among the rolls 2 for winding the filter cloth 1, the roll located on the side of the traveling direction A from the vacuum box 5 is connected to driving means such as a motor 6 to form a driving roll 2A.
A allows the filter cloth 1 to circulate in the running direction A. Further, a plurality of the above-mentioned vacuum boxes 5 are arranged below the horizontal portion of the filter cloth 1, and these vacuum boxes 5...
The filter cloth 1 can move forward and backward in the traveling direction A of the horizontal portion.

However, in the vacuum filtration device having such a configuration, the vacuum boxes 5 are also moved in accordance with the traveling of the
When the advance of the vacuum box 5 reaches its stroke end, the vacuum suction is released, the vacuum box 5 is retracted by the air cylinder 9 to the original position, and then the filter cloth 1 is again moved. The workpiece P is vacuum-suctioned while moving forward. By repeating such an operation, the object P supplied on the filter cloth 1 is processed.
Are sequentially filtered. The pressing rolls 8 provided above the horizontal portion of the filter cloth 1 are pressed against the filter cloth 1 while the vacuum box 5 is moving forward to squeeze the object P, while the vacuum box 5 is pressed. Move away from the filter cloth 1 when
It is designed not to hurt.

[0007]

However, first, in the vacuum filtration device shown in FIG. 9, the pressing rolls 8.
Is pressed, the rubber belt 3 supporting the filter cloth 1 from below is elastically compressed and crushed, thereby increasing the contact area between the pressing roll 8 and the workpiece P, and thus the pressing force itself is reduced. This causes a problem that the dehydration effect cannot be obtained sufficiently. 10 without the rubber belt 3 interposed.
Although such a problem does not occur in the vacuum filtration device shown in FIG. 1, while the vacuum boxes 5 are retracted after reaching the stroke end, the vacuum suction by the vacuum boxes 5 is also performed as described above and the pressing rolls 8 are used. Squeezing is also not performed, and at that time, a striped portion containing a large amount of liquid that is not sufficiently filtered is left on the object to be treated P on the filter cloth 1, and the dewatering efficiency is also impaired. Was.

The present invention has been made under such a background, and in the above-described vacuum filtration apparatus for vacuum-filtering an object to be processed supplied on a filter cloth circling in a predetermined traveling direction. The purpose is to further improve the dehydration effect.

[0009]

In order to solve the above-mentioned problems and to achieve the above object, the present invention firstly makes it possible to be wound around a plurality of rolls and to orbit in a predetermined traveling direction. Endless filter cloth, and first filtering means for vacuum-filtering the object supplied on the filter cloth by a vacuum box provided below the filter cloth, among them, the roll located in the traveling direction side of the first filtration means, vacuum filtration second filtering means are provided
In the apparatus, the second filtration means includes the roll
The outer periphery is processed through the filter cloth wound on the roll.
A plurality of vacuum chambers are provided for vacuum filtering the material,
Processed in vacuum chambers within a certain range of these vacuum chambers
While control means for vacuum-filtering things are provided,
On the outer peripheral side of the filter cloth wound on the roll,
A pressing roll urged toward the inner circumference of the
And the filter cloth is placed between the roll and the pressing roll.
The pressed filter cloth is wound endlessly
The pressing roll is controlled by the control
The chamber is arranged in accordance with the above specified range where the vacuum suction force acts.
In the area where the press roll is installed
And the object to be processed is directly squeezed by the pressing roll.
In there region is characterized by vacuum suction is not performed, or
Second, it is wound between a plurality of rolls for a predetermined traveling.
Endless filter cloth that can rotate in the direction
Vacuum box provided below the filter cloth
And first filtration means for vacuum filtration by
The traveling of the first filtering means out of the rolls
The second filtration means is provided on the roll located on the direction side.
In the vacuum filtration device, the second filtration means
Is the filter wound around the roll on the outer periphery of the roll.
A plurality of vacuum chambers are provided for vacuum filtering the object to be processed through the cloth.
And within a predetermined range of these vacuum chambers.
The vacuum chamber is equipped with control means for vacuum-filtering the workpiece.
The outside of the filter cloth wound on the roll
On the circumferential side, a pressing roller urged toward the inner circumferential side of the roll
The filter cloth is placed on this pressing roll.
Pressed filter cloth is endless so that it is sandwiched between the rolls.
The pressing roll is wound around the control means.
Therefore, the predetermined range in which the vacuum suction force acts on the vacuum chamber.
And the pressing roll is
In the area between adjacent pressing rolls
Is characterized in that vacuum suction is not performed ,
The object to be treated filtered by the first filtration means is filtered by the second filtration means provided on the roll on the side of the filter cloth in the traveling direction, so that a higher dewatering effect can be obtained. .

Further, in the present invention, as the second filtering means, a vacuum chamber for vacuum-filtering an object to be processed through the filter cloth wound around the roll is provided around the roll.
By using the roll itself as the filtration means, the liquid component in the object to be treated can be continuously removed regardless of the operation in the first filtration means, and the provision of the second filtration means makes the apparatus unnecessarily large. Can be prevented. Further, by providing a plurality of vacuum chambers on the outer periphery of the roll and providing the second filtration means with a control means for vacuum-filtering an object to be processed by a vacuum chamber in a predetermined range among these vacuum chambers. In addition, more efficient filtration can be performed. Furthermore, a pressing roll urged toward the inner peripheral side of the roll is provided on the outer peripheral side of the filter cloth wound around the roll, and the filter cloth is sandwiched between the pressing roll and the roll. As described above, by wrapping the pressed filter cloth endlessly, the pressed filter cloth is pressed against the filter cloth side by the pressing roll to squeeze the object to be processed, so that a further dewatering effect can be obtained. Becomes And the present invention
Then, in the second filtering means, the pressing roll is
A vacuum suction force acts on the vacuum chamber by the control means.
Since it is arranged according to the above specified range,
The liquid that has squeezed out of the material and oozes out is quickly vacuum filtered.
It is possible to remove it.

[0011]

FIG. 1 to FIG. 7 show one embodiment of the present invention. In these figures, reference numeral 1
Reference numeral 1 denotes an endless belt-like filter cloth wound around a plurality of rolls 12. The upper center of the filter cloth 11 is arranged so as to extend in the horizontal direction. Of the plurality of rolls 12, the roll 12 that winds and supports the filter cloth 11 at one end of the horizontal portion 11 </ b> A of the filter cloth 11 is connected to driving means such as a drive reduction gear provided with a motor 13. The driving roll 12A is
A rotates the filter cloth 1 by the driving means.
1 is configured to be able to circulate between the rolls 12 so that the horizontal portion 11A travels in the traveling direction indicated by the arrow A in FIG.

On the other hand, below the horizontal portion 11A of the filter cloth 11, a rail 14 is provided parallel to the horizontal portion 11A in the running direction A, and a plurality of vacuum boxes 15 Are provided so as to be able to advance and retreat along the rails 14 so that the open upper surface portion is in close contact with the lower surface of the horizontal portion 11A of the filter cloth 11. Further, a vacuum hose 16 is connected to each of the vacuum boxes 15.
Is connected to the filtrate collecting pipe 17 and the vacuum shut-off valve 1
The vacuum box 15 to the vacuum source 20 are connected to a vacuum source 20 via the vacuum source 8 and the vacuum release valve 19, and constitute a first filtration unit 21 in the present embodiment.

The horizontal portion 11A of the filter cloth 11
On the rear side in the running direction A, the filter cloth 11
A supply means such as a slurry inlet 22 for supplying the object P is provided on the horizontal portion 11A. The vacuum boxes 15 are provided with advancing / retracting means such as an air cylinder 23. The air cylinders 23 cause the vacuum boxes 15 to move in the traveling direction A in synchronization with the traveling speed of the filter cloth 11. The operation of moving forward and retreating to the original position when the stroke end is reached is repeated. Furthermore, in response to this, the first
Of the vacuum source 15 via the vacuum hose 16 while the vacuum boxes 15 are advancing.
0, and while the vacuum suction of the object to be processed P is performed via the filter cloth 11, while the air cylinder 23 reaches the stroke end and the vacuum boxes 15 retreat, this connection is released and the vacuum is removed. So that the negative pressure in box 15 is released
The vacuum shutoff valve 18 and the vacuum release valve 19 are controlled.

In this embodiment, a plurality of vacuum chambers 24 are formed on the outer periphery of the driving roll 12A located on the side of the traveling direction A of the filter cloth 11 from the first filtering means 21. These vacuum chambers 24...
And a second filtering means 25 is provided on the drive roll 12A. Here, as shown in FIGS. 2 and 3, the drive roll 12A has a trunnion 27 on one end surface of a substantially cylindrical roll body 26, and a shaft 28 on the other end surface. The drive means such as the motor 13 is connected to the shaft 28 so as to be rotatable about the axis O. Further, on the outer peripheral surface of the roll main body 26, flange portions 26A, 26A are formed over the entire periphery on both end surfaces thereof, and these flange portions 26A, 26A,
26A, a partition plate 29 extending in the axis O direction.
Are provided at equal intervals in the circumferential direction, and a plurality of the vacuum chambers 24 are defined by the inner walls of the flange portions 26A, 26A and the partition plate 29 so as to open to the outer periphery of the drive roll 12A. I have. Note that, in the vacuum chamber 24, a saw-shaped plate member 30 having a large number of grooves 30 </ b> A on the inner peripheral side of the roll main body 26 is housed so as to be spaced from the partition plate 29.

Further, in the flange portion 26A on the one end surface side of the roll main body 26, a filtrate passage 26B communicating with the vacuum chamber 24 is formed for each vacuum chamber 24. The trunnion 27 attached to one end face also has a passage 27A for each vacuum chamber 24 from the outer peripheral face toward one end face of the trunnion 27.
Are formed, and these passages 26B, 27A are formed.
Are connected to each other by a filtrate pipe 31. The automatic valve 33 rotates on one end surface of the trunnion 27 via a resin sliding plate 32 fixed to the end surface of the trunnion 27 through passages 32A communicating with the passages 27A. Body 26 and trunnion 27
Fixed regardless of the rotational position of the trunnion 2
7 and a sliding plate 32 are provided so as to be rotatable relative to each other. The automatic valve 33 and a baffle plate 34 incorporated in the automatic valve 33 allow a vacuum in a predetermined range of the vacuum chambers 24. The control means 35 of the present embodiment for vacuum-filtering the object P by the chamber 24 is constituted.

As shown in detail in FIG. 4, the automatic valve 33 is inserted into and supported by a shaft 36 projecting along the axis O from the one end surface of the trunnion 27, and supports the trunnion 27. Bearing 3 for rotatably supporting
7 are fixed to the trunnion 27 by the fixing bolts 38 and are rotatable relative to the trunnion 27 as described above, and are further pressed toward the trunnion 27 by the springs 39 loosely inserted into the fixing bolts 38. ing.
In the automatic valve 33, an annular concave portion 33A centered on the axis O is formed so as to open toward the trunnion 27, and the opening side of the concave portion 33A is formed to be one step wide. The baffle plate 34 is
In this widened portion, the automatic valve 33 is provided so as to cover a predetermined range of the opening of the concave portion 33A in an arc shape and to close the passage 32A of the sliding plate 32 in the predetermined range. It is attached flush to the end face on the trunnion 27 side. Further, the concave portion 33A has the vacuum source 20
Is provided.

On the other hand, on the outer peripheral side of the driving roll 12A, as shown in FIGS.
A pair of support frames 40, 40 are disposed in an arc shape around the rotation axis O of A, and these support frames 40, 40 are disposed on the inner side in the radial direction with respect to the axis O. The pair of pressing cylinders 41 are pins 4
2, and a pressing roll 44 is provided at the tip of each pair of pressing cylinders 41, 41 in parallel with the axis O via a bearing 43.
And it is attached rotatably. Here, the pressing rolls 44... Move from the position on the outer periphery of the drive roll 12A where the filter cloth 11 starts to be wound around the drive roll 12A, in the rotation direction of the drive roll 12A, that is, the traveling orbit of the filter cloth 11. It is arranged toward the direction. A return roll 45 is provided on the outer peripheral portion of the support frames 40, 40. The three pressing rolls 44 and the return roll 45 have
The pressed filter cloth 46 is wound endlessly, and the filter cloth 11 and the filter cloth 11 are disposed between a portion of the pressed filter cloth 46 wound around the pressing rolls 44 and the outer periphery of the drive roll 12A. The object to be processed P is sandwiched between the pressing filter 44 and the pressing roll 44 in the running direction indicated by the arrow B in FIG. The circuit can be wound around the roll 45.

The pressing cylinder 41 is pressed by a pressing roll 44 with a predetermined pressing force by air or hydraulic pressure.
To the drive roll 12A side,
A guide 41 </ b> A that guides the bearing 43 by slidingly contacting the bearing 43 is provided at the distal end so that the pressing roll 44 is urged in the radial direction with respect to the axis O. In addition, among the three pressing rolls 44...
The pressing roll 44 located on the side of the traveling direction B has a knife for scraping off the workpiece P attached to the pressed filter cloth 46 so as to be in sliding contact with the pressed filter cloth 46 wound around the pressing roll 44. 47 are provided. Drive roll 1
2A is also provided with a knife 48 for peeling the object P after vacuum filtration from the filter cloth 11. Further, the drive roll 12A and the filter cloth 11
The cleaning device 4 for cleaning the filter cloth 11 as shown in FIG.
9 are provided.

The range in which the baffle plate 34 of the control means 35 covers the opening of the annular concave portion 33A of the automatic valve 33 in an arc shape is set corresponding to the position of the pressing roll 44 . Here, FIG. 5 shows an embodiment of the present invention.
This is a reference example to explain the status.
In the example , as shown in FIG. 5, the entire area where the pressing filter cloth 46 is pressed against the outer periphery of the driving roll 12A by the three pressing rolls 44 is an area X in which the concave portion 33A is opened. The opening of the recess 33 </ b> A other than the opening is a region Y closed by the baffle plate 34. Therefore, among the vacuum chambers 24 formed on the outer periphery of the drive roll 12A, the passage 32A of the sliding plate 32 connected to the vacuum chamber 24 via the passage 26B, the filtrate pipe 31, and the passage 27A opens in the region X. The vacuum chamber 24 to be connected is connected to the vacuum source 20 from the concave portion 33A of the automatic valve 33 via the connection portion 33B, and the filter cloth 11 is connected by the vacuum chamber 24.
Through which vacuum filtration is performed. On the other hand, with respect to the vacuum chamber 24 in which the continuous passage 32A is located in the region Y, the space between the vacuum chamber 24 and the vacuum source 20 is blocked by the baffle plate 34, and the vacuum filtration is not performed. And
In the reference example, the suction force acts on the vacuum chambers 24.
And the area in which the pressing rolls 44 are arranged.
Although it is matched with the box, in the embodiment of the present invention,
Depends on the properties of the object P, as shown in FIG.
In addition to the area Y, the pressing rolls 44 are used.
The range of the region Z ₁ of the processing object P is directly squeezed
Multiple baffle plates to prevent vacuum suction
34, the range in which the concave portion 33A is covered,
Or conversely, as shown in FIG.
44 and 44 vacuum suction is performed in the region Z ₂ between each other
Not to be.

In the vacuum filtration apparatus thus configured, the horizontal portion 11 of the filter cloth 11 is
The material P to be processed supplied to A is first filtered by the first filtration means 2.
In 1, vacuum suction is performed by vacuum boxes 15 and filtered. The vacuum box 15 in the first filtering means 21
Are similar to those of the conventional filtering apparatus shown in FIG. However, in the vacuum filtration device having the above-described configuration, the second filtration unit 25 is provided on the driving roll 12A located on the side of the traveling direction A of the filter cloth 11 from the first filtration unit 21. Even if a portion containing a liquid component is left in the object to be treated P without sufficient dehydration by the filtering means 21, it is possible to surely suction-filter this by the second filtering means 25, A sufficient solid-liquid separation of the processing object P can be promoted by improving the dewatering effect.

Further, in the present embodiment, the second filtering means 25 is formed by the vacuum chambers 24 formed on the outer periphery of the driving roll 12A through the filter cloth 11 wound around the driving roll 12A. The object P is vacuum-filtered. Therefore, the object P is continuously filtered regardless of the relative movement of the filter cloth 11 and the vacuum box 15 in the first filtering means 21. It is possible to perform uniform dehydration. Further, by using the drive roll 12A for traveling the filter cloth 11 as the second filtering means 25, space can be saved, and by providing the second filtering means 25, the vacuum filtration device becomes large. Thus, it is possible to provide a compact vacuum filtration apparatus having a high dehydration effect as described above. In addition, in the present embodiment, in the vacuum chamber 24,
The board 30 is provided with a mushroom-shaped plate 30 having grooves 30A..., Which prevents the filter cloth 11 from being drawn into the vacuum chamber 24 during vacuum suction. As a result, more reliable filtration and recovery of the filtrate can be promoted.

Here, in the above reference example , the driving roll 12A in which the vacuum chambers 24 of the second filtering means 25 are formed,
A control means 35 having an automatic valve 33 is provided, and a baffle plate 34 incorporated in the automatic valve 33 controls only the vacuum chambers 24 within a predetermined range (a range corresponding to a region X in FIG. 5). A vacuum suction force can be applied to control the vacuum chambers 24 located in another range (a range corresponding to the area Y in FIG. 5) so as not to apply the suction force. For this reason, the vacuum chambers 24 where the filter cloth 11 is not wound around the drive roll 12A, or the vacuum chambers 24 where the liquid components are sufficiently dehydrated by the second filtering means 25 are provided. Can apply the suction force intensively to the vacuum chambers 24 from the position where the filter cloth 11 starts to be wound around the driving roll 12A without applying the suction force from the vacuum source 20, that is, Efficient filtration can be performed by effectively applying the vacuum suction force of the vacuum source 20.

On the other hand, in the present embodiment, the second filtering means 2
5 are provided on the outer periphery of the drive roll 12A on which the pressing rolls 5 are provided, and the pressing rolls 44 are wound by the pressing rolls 44 and the return roll 45 to form a drive roll. The filter cloth 11 and the object to be processed P on the filter cloth 11 are sandwiched between the filter cloth 11 and the outer periphery of the filter cloth 12A. Accordingly, the object P is pressed and squeezed by the press filter cloth 46 and the pressing rolls 44, and the separation of the liquid component from the object P is further promoted. Combined with the vacuum filtration by 25, more efficient filtration can be achieved and the dewatering effect can be improved. Moreover, in the present embodiment, the pressing force by the pressing rolls 44 and the pressing filter cloth 46, that is, the pressing force, can be adjusted by changing the urging force of the pressing cylinders 41... Therefore, the object P on the filter cloth 11
The pressing force can be applied to the object to be processed P in accordance with the thickness of the object, the remaining liquid in the object to be processed P in the first filtering means 21, and the like, and the filtration efficiency can be further improved. It is possible.

In the above-described reference example , as shown in FIG. 5, the control means 35 adjusts the range (area X in FIG. 5) in which a vacuum suction force acts on the vacuum chambers 24... And the pressing roll 44
Are arranged so that the object to be processed P is squeezed by the squeezing filter cloth 46, that is, the second filtering means 2
While the object P is vacuum-filtered at 5, the pressing by the pressing rolls 44 and the pressing filter cloth 46 is simultaneously performed. Therefore, according to this reference example , it is possible to quickly remove the liquid component that has been squeezed out and oozed out of the object P by vacuum filtration, thereby achieving a further dehydration effect. However, in the above reference example
As this is suction to the vacuum chamber 24 ... is matched to suit the area to be the range and pressing roll 44 ... it is disposed in the region X that acts, in this embodiment of the object P Instead of adopting such a configuration depending on properties and the like , as shown in FIG.
Z ₁ where the object P is directly squeezed by
The range in which the concave portion 33A is covered by using a plurality of baffle plates 34 is set so that vacuum suction is not performed even in the range of, or conversely, as shown in FIG. vacuum suction is prevented performed in the region Z ₂ between.

In this embodiment, the driving roll 12A
Is described by rotating the filter cloth 11 in the traveling direction A by rotating the filter cloth 11 in a running direction A by a driving means such as a motor 13. However, the filter cloth 11 is rotated by another driving means.
It is also possible to apply the present invention to a vacuum filtration device that travels, for example, by moving the drive roll 12A along the travel direction A by a drive cylinder 51 such as air pressure or hydraulic pressure as shown in FIG. It is also possible to apply the present invention to a vacuum filtration device having a driving means for intermittently rotating the filter cloth 11. However, FIG.
In the figure, the same reference numerals are assigned to parts common to the above-described embodiment shown in FIGS. Here, FIG.
In the vacuum filtration device shown in FIG. 1, the vacuum boxes 15... Of the first filtration means 21 are fixedly provided, and while the first filtration means 21 is performing vacuum suction, the filter cloth 1 is removed.
The horizontal portion 11A does not move in close contact with the vacuum boxes 15.

When the filtration by the first filtering means 21 is completed and the vacuum suction by the vacuum boxes 15 is released, the driving cylinder 51 connected to the driving roll 12A is driven.
As a result, the drive roll 12A advances in the traveling direction A, and the horizontal portion 11A of the filter cloth 11 and the filtered object P on the filter cloth 11 are also dragged forward in the traveling direction A, Since the new filter cloth 11 is pulled out onto the vacuum boxes 15..., The object P is supplied from the inlet 22 thereon. At this time, the drive roll 12A does not rotate, and the pressing rolls 44... And the press filter cloth 46 provided on the outer periphery of the drive roll 12A are supported by the drive cylinder 52 attached to the support frame 40. The unit 40 advances together with the drive roll 12A. Further, the filter cloth 11 is wound around a tension roll 54 connected to a cylinder 53 on the rear side of the first filtration means 21 in the traveling direction A. When the drive roll 12A advances, this tension is applied. The roll 54 retracts to prevent the filter cloth 11 from running backward, and the vacuum box 15
.. Is designed to facilitate pulling out a new filter cloth 11 upward.

When the object P is supplied to the filter cloth 11 newly drawn out onto the vacuum boxes 15 in this way, the object P is subjected to vacuum filtration again by the first filtering means 21. In parallel with this, the drive roll 12A and the compressed filter cloth 46, etc., which have been advanced, are retracted by the drive cylinders 51 and 52 while rotating and revolving.
Vacuum filtration is performed on the object to be processed P by the filtering means 25. At the same time, the tension roll 54 advances by the cylinder 53, and pulls back the filter cloth 11 sent out by the retreat of the driving roll 12A. However,
In the vacuum filtration device having such a configuration, the workpiece P filtered by the first filtration unit 21 is further subjected to vacuum filtration by the second filtration unit 25 provided on the driving roll 12A on the traveling direction A side. Therefore, it is possible to obtain effects such as improvement in dehydration efficiency as in the vacuum filtration device of the above embodiment. Also, as in these embodiments,
In addition to a device for performing vacuum filtration by directly contacting a vacuum box with a filter cloth as a first filtration means, for example, a vacuum filtration device for filtering an object to be processed through a rubber belt or the like as shown in FIG. It is also possible to apply the present invention.

[0028]

As described above, according to the present invention,
The object filtered by the first filtration means is further filtered by the second filtration means provided on the roll on the traveling direction side of the filter cloth. Therefore, even if the first filtration means does not perform sufficient dehydration. In addition, even if a portion containing a liquid component is left on the object to be treated, it can be reliably filtered and removed, and the solid-liquid separation of the object to be treated can be sufficiently improved by improving the dewatering effect. Can be encouraged. And this second
Is provided on a roll around which the filter cloth is wound. Therefore, by providing such a second filtering means, it is possible to avoid an increase in the size of the apparatus. A device can be provided. And further in this second filtration means
Is the filter wound around the roll on the outer periphery of the roll.
A plurality of vacuum chambers are provided for vacuum filtering the object to be processed through the cloth.
And within a predetermined range of these vacuum chambers.
The vacuum chamber is equipped with control means for vacuum-filtering the workpiece.
The outside of the filter cloth wound on the roll
On the circumferential side, a pressing roller urged toward the inner circumferential side of the roll
The filter cloth is placed on this pressing roll.
Pressed filter cloth is endless so that it is sandwiched between the rolls.
The pressing roll is wound around the control means.
Therefore, the predetermined range in which the vacuum suction force acts on the vacuum chamber.
Since it is arranged according to the surroundings,
To quickly remove the oozing liquid by vacuum filtration
It is possible to achieve a further dehydration effect.
You.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view around a second filtering means 25 of the embodiment shown in FIG.

FIG. 3 is a sectional view including a rotation axis O of a driving roll 12A in FIG. 2;

FIG. 4 is an enlarged sectional view of a control unit 35 of the embodiment shown in FIG.

FIG. 5 is a view showing a region X in which vacuum suction is performed by the control means 35 shown in FIG. 4 in the reference example according to the embodiment of the present invention;
FIG. 4 is a diagram showing a region Y where vacuum suction is not performed.

[6] The control means 35 shown in FIG. 4 the vacuum suction area X and the vacuum suction is carried out is not performed region Y, is a diagram showing the Z _1.

7 is a diagram showing a region X where vacuum suction is performed by the control means 35 shown in FIG. 4 and regions Y and Z ₂ where vacuum suction is not performed.

FIG. 8 is a side view showing another embodiment of the present invention.

FIG. 9 is a side view showing a conventional vacuum filtration device.

FIG. 10 is a side view showing another conventional vacuum filtration device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Filter cloth 11A Horizontal part in the upper center of filter cloth 11 12 Roll 12A Drive roll 15 Vacuum box 20 Vacuum source 21 First filtration means 24 Vacuum chamber 25 Second filtration means 33 Automatic valve 34 Baffle plate 35 Control means 44 Pressing roll 46 compression filter cloth a region Y where the traveling direction P treatment object X control means 35 in the running direction B squeezing the filter cloth 46 of the filter cloth 11 is vacuum suction is performed, the vacuum suction is performed by Z _1, Z ₂ control unit 35 No area

Claims (2)

(57) [Claims] An endless filter cloth wound between a plurality of rolls and capable of rotating in a predetermined traveling direction, and an object supplied on the filter cloth is placed below the filter cloth. A first filtration unit for performing vacuum filtration by a provided vacuum box, and a second filtration unit is provided on a roll of the rolls located on the traveling direction side of the first filtration unit. In the vacuum filtration device, the second filtration means is provided on the outer periphery of the roll with a plurality of vacuum chambers for vacuum-filtering an object to be processed through the filter cloth wound around the roll. A control means for vacuum-filtering the object to be processed is provided in a vacuum chamber in a predetermined range among these vacuum chambers, while the outer periphery of the filter cloth wound around the roll is provided with A press roll urged toward the inner circumference is provided. The pressed filter cloth is wound endlessly on the pressing roll so as to sandwich the filter cloth between the pressing roll and the roll. The pressing roll applies a vacuum suction force to the vacuum chamber by the control means. Is disposed in accordance with the predetermined range in which the pressure roller acts , and the pressing roll is disposed.
The object to be processed is directly
Vacuum suction is not performed in a region where the air is compressed . 2. A method of winding between a plurality of rolls for a predetermined running
An endless filter cloth that can rotate in the row direction, and on this filter cloth
The object supplied to the filter cloth is vacuumed below the filter cloth.
A first filtration means for performing vacuum filtration by using a box;
The traveling of the first filtering means out of the rolls
The second filtration means is provided on the roll located on the direction side.
In the vacuum filtration device, the second filtration means
Is the filter wound around the roll on the outer periphery of the roll.
A plurality of vacuum chambers are provided for vacuum filtering the object to be processed through the cloth.
And within a predetermined range of these vacuum chambers.
The vacuum chamber is equipped with control means for vacuum-filtering the workpiece.
The outside of the filter cloth wound on the roll
On the circumferential side, a pressing roller urged toward the inner circumferential side of the roll
The filter cloth is placed on this pressing roll.
Pressed filter cloth is endless so that it is sandwiched between the rolls.
The pressing roll is wound around the control means.
Therefore, the predetermined range in which the vacuum suction force acts on the vacuum chamber.
And the pressing roll is
In that range, in the region between the pressing roll adjacent
Is a vacuum filtration device wherein vacuum suction is not performed .