JP2002144091A - Filter-cloth belt type dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase dehydration capacity for various kinds of slurry or sludge materials to be dehydrated without increasing the size of a dehydrator. SOLUTION: A press top roll 3A and a press bottom roll 3B press and dehydrate the slurry or sludge substances S to be dehydrated together with a felt-made filter-cloth belt 1 which is wound in an endless manner and successively transferred. The press top roll 3A presses the substance S to be dehydrated by a circumferential surface thereof which is formed smooth, and the dehydrated substance C is adhered to the circumferential surface. In the press bottom roll 3B, a flexible tube 3D externally fitted to a shoe roll 3C is pressed against the filter-cloth belt 1, and rotated in the circumferential direction along the shape of the circumferential surface of the shoe roll 3C. A flexible tube 3D presses the filter-cloth belt 1 by a pressing part 3D2 of a predetermined area along a pressing recessed surface 3C2 of the shoe roll 3C, and a plurality of water draining guide grooves formed in the outer circumferential surface promote the draining of water passing the filter-cloth belt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth belt type dewatering apparatus for dewatering a slurry or sludge-like material to be dewatered into a cake having a low water content. The present invention relates to an improved filter cloth belt type dewatering apparatus.

[0002]

2. Description of the Related Art A so-called belt press type dewatering apparatus is conventionally known as a dewatering apparatus for dewatering a slurry or sludge to be dewatered. This type of belt press type dewatering apparatus is based on the basic principle that a material to be dewatered is pressed by an endless pressure belt against an endless filter cloth belt and filtered. Discloses a "dewatering device" having a structure in which one endless pressure belt (endless high-pressure belt) and one endless filter cloth belt sandwiching a material to be dewatered are wound around a dewatering roller and a pressure roller. Have been.

Japanese Patent Application Laid-Open No. 58-181498 discloses two endless filter cloth belts (an upper filter cloth and a lower filter cloth) wound around a plurality of squeezing rollers and a high-pressure roller in a state where an object to be dehydrated is sandwiched. A "belt press type sludge dewatering machine" including a filter cloth) and a single pressure belt for pressing these against a high-pressure roller is disclosed. Furthermore, Japanese Patent Laid-Open No. 62-
Japanese Patent No. 244599 discloses two endless filter cloth belts (one filter cloth and the other filter cloth) for sandwiching a material to be dehydrated,
A “belt press type dewatering / separating machine” having a structure in which two pressure belts (one pressurized belt and the other pressurized belt) sandwiching these are wound around a plurality of dewatering rollers is disclosed.

However, the so-called belt press type dewatering apparatus described in each of the above publications has a set of roller units for winding at least one endless filter cloth belt so as to be transportable, and at least one endless filter cloth belt. A minimum of two sets of roller units is required, together with another set of roller units for winding the pressure belt so that it can be transported, and there is a problem that the structure is complicated and the size is increased. In addition, the endless filter cloth belt may be clogged and may not exhibit sufficient filtration performance, and there is a problem that the dewatering efficiency of the material to be dewatered is poor.

Therefore, the joint applicant of the present application has proposed a filter cloth belt type dewatering method that can efficiently dewater various slurry-like or sludge-like materials to be dewatered into a cake having a low water content while having a simple structure. Apparatus for Japanese Patent Application Hei 11-36022
No. 7 (filed on December 20, 1999).
This filter cloth belt type dewatering device is a dewatering device of a type in which a single filter cloth belt capable of filtering a slurry-like or sludge-like material to be dewatered is wound endlessly and sequentially transferred, The material to be dewatered supplied to the upper surface side of the filter cloth belt is dewatered by applying pressure between a pair of press rolls together with the filter cloth belt, and the dewatered processed material is transferred to one press roll to form a filter cloth. It is provided with a pressurized dewatering transfer unit for peeling off from the belt.

[0006]

In the above-mentioned filter cloth belt type dewatering apparatus, the pressurized surfaces of a pair of press rolls for pressurizing and dewatering the material to be dewatered are merely circumferential surfaces. Has a small pressing area. For this reason, if the transport speed of the filter cloth belt is increased to increase the throughput of the object to be dehydrated, the time for dehydrating the object to be dehydrated becomes shorter, and the dehydration becomes insufficient. However, if the shaft length of the pair of press rolls is increased, the throughput of the material to be dewatered can be increased without increasing the transport speed of the filter cloth belt. However, in this case, the apparatus configuration becomes large. There is.

Accordingly, an object of the present invention is to provide a filter cloth belt type dewatering apparatus which can increase the amount of various types of slurry or sludge to be dewatered without increasing the size of the apparatus. I do.

[0008]

As a means for solving the above problems, a filter cloth belt type dewatering apparatus according to the present invention comprises a felt filter cloth belt capable of filtering a slurry or sludge-like material to be dewatered. Is a filter cloth belt type dewatering apparatus of a type in which is wound endlessly and sequentially transferred, and a press-top roll for dehydrating the material to be dewatered supplied onto the filter cloth belt by pressing together with the filter cloth belt And a press bottom roll, wherein the press top roll is rotatably supported, and a peripheral surface for pressing the object to be dewatered is formed into a smooth surface so as to transfer the dehydrated object. A shoe roll in which the press bottom roll is non-rotatably supported, and has a pressurized concave surface formed on the peripheral surface thereof, which has an arc-shaped cross section facing the peripheral surface of the press top roll and extends in the axial direction. A flexible tube that is externally rotatable with respect to the shoe roll in a circumferential direction along the peripheral surface shape thereof, and that presses the filter cloth belt with a pressurized portion having a predetermined area along the pressurized concave surface of the shoe roll. And a plurality of drain guide grooves are formed on the outer peripheral surface of the flexible tube.

In the filter cloth belt type dewatering apparatus according to the present invention,
When a slurry-like or sludge-like material to be dewatered is supplied onto a felt-made filter cloth belt that is wound endlessly and transferred sequentially, a press top roll and a press bottom roll filter the material to be dewatered. Dehydration by pressing together with the cloth belt. At this time, the press top roll transfers the dehydrated processed material to the peripheral surface by pressing the material to be dehydrated on the smooth surface formed on the peripheral surface. On the other hand, the press bottom roll rotates in the circumferential direction along the circumferential surface shape of the shoe roll when the flexible tube provided on the shoe roll is pressed against the filter cloth belt. Then, this flexible tube presses the filter cloth belt with a pressurized portion having a predetermined area along the pressurized concave surface of the shoe roll,
A plurality of drain guide grooves formed on the outer peripheral surface promote drainage of water passing through the filter cloth belt.

In the filter cloth belt type dewatering apparatus of the present invention,
It is preferable that the press top roll is configured to be rotatable in the direction of transport of the filter cloth belt, since a separate drive roller for transporting the filter cloth belt is not required.

In the filter cloth belt type dewatering apparatus of the present invention, if the center distance between the press top roll and the press bottom roll is adjustable, the pressure applied to the material to be dewatered and the filter cloth belt is increased. Can be adjusted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a filter cloth belt type dewatering apparatus according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a front view showing an entire structure of a filter cloth belt type dewatering apparatus according to one embodiment, and FIG. 2 shows a wound state of a filter cloth belt of the filter cloth belt type dehydration apparatus according to one embodiment. It is a front view which shows typically.

As shown in FIGS. 1 and 2, the filter cloth belt type dewatering apparatus according to one embodiment is an apparatus for filtering and dewatering a slurry- or sludge-like material S to be dewatered. Examples of the material S to be dehydrated include excess sludge in the food industry, gluten meal, excess sludge in the chemical industry,
Examples include aluminum hydroxide, magnesium hydroxide, calcium carbonate, ceramic raw materials, lead-containing sludge in the non-ferrous metal industry, copper-containing sludge, zinc oxide sludge, activated excess sludge of sewage, and domestic wastewater sludge.

In one embodiment, the filter cloth belt type dewatering device is made of a felt material capable of filtering the material S to be dewatered,
In addition, a single filter cloth belt 1 wound endlessly and transferred sequentially, and a material S to be dewatered to be supplied to the upper surface side of the filter cloth belt 1 are suctioned from the lower surface side of the filter cloth belt 1. Negative pressure dewatering unit 2 for initially dehydrating the material S to be dehydrated by applying a negative pressure
Then, the object S to be dehydrated, which has been initially dehydrated, is pressed together with the filter cloth belt 1 between a pair of upper and lower press top rolls 3A and press bottom rolls 3B to be dehydrated, and the dehydrated processed material C is pressed to the upper press top. Pressurized dewatering transfer unit 3 which transfers to the peripheral surface of roll 3A and peels off from filter cloth belt 1, and a processed material recovery unit which scrapes and recovers processed material C transferred to upper press top roll 3A 4, a cleaning unit 5 for cleaning the filter cloth belt 1 from which the processing object C has been peeled off, and a squeezing unit 6 for squeezing the cleaned filter cloth belt 1 between a pair of squeeze rolls 6A and 6B.

The filter cloth belt 1 has a thickness of 4 to 8 m.
m, an endless belt having a width of about 500 to 4,200 mm, and as shown in FIG.
And a three-layer felt material having an inner surface layer 1B constituting the lower surface thereof and an intermediate layer 1C therebetween. The outer surface layer 1A is constituted by an extra-fine fiber layer for filtering the material S to be dehydrated, the intermediate layer 1C is constituted by a medium-fine fiber layer for promoting the permeation of moisture, and the inner surface layer 1B is constituted by a base cloth layer for promoting drainage. Have been. The outer surface layer 1A, the intermediate layer 1C, and the inner surface layer 1B are joined so that the fibers are entangled with each other without using an adhesive or the like by a process similar to the cotton beating process.

As shown in FIGS. 1 and 2, the filter cloth belt 1 is composed of a lower squeeze roll 6B to a guider roll 7, a press bottom roll 3B, an underwater roll 8, a felt roll 9, a stretch roll 10, and a felt roll 1.
1. It is sequentially wound around a felt roll 12, and is wound endlessly again from this felt roll 12 to a squeeze roll 6B. The filter cloth belt 1 is configured to be sequentially transported in the direction of the arrow by rotating the press top roll 3A clockwise.

The press bottom roll 3B and the squeeze roll 6B are disposed apart from each other in the left and right direction, and the guider roll 7 is disposed at a position slightly deviated upward from an intermediate portion between the press bottom roll 3B and the squeeze roll 6B. . Then, the filter cloth belt 1 whose inner surface is guided by the guider roll 7 is stretched between the press bottom roll 3B and the squeeze roll 6B so as to draw a loose slope mountain shape,
The guider roll 7 corrects the displacement in the width direction.

On the other hand, the underwater roll 8 is arranged in the washing pool 5A of the washing section 5 arranged below the guider roll 7, and the filter cloth belt 1 fed from the press bottom roll 3B is moved in the washing pool 5A. The inner surface of the filter cloth belt 1 is guided so as to be immersed in the washing water. The felt roll 9 is disposed above the central portion of the washing pool 5A, and guides the inner surface of the filter cloth belt 1 so as to pull the filter cloth belt 1 obliquely upward from the inside of the washing pool 5A.

The stretch roll 10 is disposed diagonally above and to the left of the felt roll 9 and presses the outer surface of the filter cloth belt 1 so as to remove slack of the filter cloth belt 1. The felt roll 11 is a squeeze roll 6B.
Is disposed between the felt roll 12 and the stretch roll 10 disposed below the belt, and presses the outer surface of the filter cloth belt 1. And the felt roll 12
The inner surface of the filter cloth belt 1 is guided so that the filter cloth belt 1 is directed upward to the squeeze roll 6B.

The negative pressure dehydrating section 2 has a first suction box 2A and a second suction box 2B to which a suction negative pressure of a vacuum pump (not shown) acts. The first suction box 2A is disposed between the squeeze roll 6B and the guider roll 7, and has an opening slidably contacting the lower surface of the filter cloth belt 1 as shown in FIG. The first suction box 2A is weakly suctioned to the extent that moisture in the material S to be dehydrated on the filter cloth belt 1 penetrates from the surface layer 1A of the filter cloth belt 1 to the intermediate layer 1C and the back layer 1B. A negative pressure, for example, a suction negative pressure of about 7 kPa acts. In addition, as shown in FIGS. 1 and 2, the material S to be dehydrated is configured to be supplied via a supply box 13 onto the filter cloth belt 1 fed from the squeezing section 6.

On the other hand, the second suction box 2B is disposed between the guider roll 7 and the press bottom roll 3B. Like the first suction box 2A, the opening is in sliding contact with the lower surface of the filter cloth belt 1. Let me. And
In the second suction box 2B, the material to be dehydrated S
A suction negative pressure is applied to the filter cloth belt 1 such that suction of the water inside the filter cloth belt 1 can be eliminated by suction, for example, a suction negative pressure of about 25 kPa. The water collected in the first suction box 2A and the second suction box 2B is:
It is configured to be collected in the collection tank 2D via the drain pipe 2C shown in FIG.

Here, in the filter cloth belt type dewatering apparatus of one embodiment, the upper press top roll 3A constituting the pressurized dewatering transfer section 3 has both ends in the axial direction of a swing arm 14A described later. Is rotatably supported at one end. The press top roll 3A has a smooth peripheral surface for pressing the object S to be dehydrated so as to transfer the dehydrated object C (see FIG. 5).

On the other hand, as shown in FIGS. 5 and 6, a lower press bottom roll 3B constituting the pressure dehydration transfer unit 3 has a shoe roll 3C whose end is non-rotatably supported.
And a flexible tube 3D provided on the shoe roll 3C.

As shown in FIG. 6, the shoe roll 3C has a small-diameter portion 3C1 protruding at both ends (only one is shown and the other is not shown). And is non-rotatably engaged by the positioning key 16. As shown in FIG. 5, an upper surface which is a part of a peripheral surface of the shoe roll 3C has an arc-shaped cross section facing the peripheral surface of the press top roll 3A and has a pressing concave surface 3C2 extending in the axial direction. Are formed. The curvature of the cross section of the pressing concave surface 3C2 is the same as that of the press top roll 3A.
Approximately coincides with the curvature of the peripheral surface.

As shown in FIG. 6, the shoe roll 3C
An oil (or water) injection pipe 3E for rotatably floatingly supporting the flexible tube 3D protrudes from an end of the small diameter portion 3C1, and an oil passage 3C3 communicating with the injection pipe 3E is formed. It is formed in the shoe roll 3C. This oil passage 3C3
Extends along the axis of the shoe roll 3C, and branches from the plurality of locations in the axial direction toward the pressing concave surface 3C2. Further, a cut surface 3C4 constituting an oil reservoir 3F is formed between the lower surface of the shoe roll 3C and the flexible tube 3D, and an oil discharge pipe 3G is inserted into the oil reservoir 3F.

On the other hand, the flexible tube 3D
It is made of a flexible material such as synthetic rubber, and has a plurality of drain guide grooves (not shown) formed on its outer peripheral surface along the circumferential direction. The depth, width, and pitch interval of each drain guide groove are determined by the flexible tube 3D.
Are appropriately set within a range that does not impair the function.

At both ends of the flexible tube 3D (only one is shown and the other is not shown), as shown in FIG. 6, flange portions 3D1 connected to the rotating ring 3H via bolts BT are provided. Is formed. The rotating ring 3H is rotatably supported by the middle diameter portion 3C5 of the shoe roll 3C via a bearing BG, so that the flexible tube 3D rotates in the circumferential direction along the circumferential shape of the shoe roll 3C. It is configured to be possible. In order to prevent leakage of oil supplied from the oil passage 3C3 to the pressurized concave surface 3C2 side of the shoe roll 3C, an oil seal pressed against the middle diameter portion 3C5 of the shoe roll 3C is provided outside the rotating ring 3H. 3
I is attached.

The pressing pressure of the press top roll 3A and the press bottom roll 3B of the pressure dewatering transfer unit 3 is controlled to 100 to 600 k by the pressure adjusting unit 17 shown in FIG.
It is set to an appropriate pressure of Pa. The pressure adjusting unit 17
Is a swinging arm 17A pivotally supporting the press top roll 3A at one end and extending in the left-right direction, and a swinging arm 17A which is erected on a frame 18 of the filter cloth belt type dehydrator and pivotally supports an intermediate portion of the swinging arm 17A. The supporting arm 17B and the frame 1
8 and a pneumatic cylinder device 17C installed between the other end of the swing arm 17A. Then, as the pneumatic cylinder device 17C extends, the press top roll 3
A swings downward and presses against the press bottom roll 3B,
The press pressure of both is adjusted according to the press force of the pneumatic cylinder device 17C.

As shown in FIG. 2 and FIG. 5, the processed material recovery section 4 includes a doctor 4A for scraping off the processed material C transferred to the peripheral surface of the press top roll 3A, and a doctor 4A for scraping off the processed material C. And a chute 4C for dropping the cake-like processed material C to the collection box 4B side. In addition, these doctor 4A, collection box 4B,
The chute 4C has a width corresponding to the length of the press top roll 3A and the press bottom roll 3B.

The washing section 5 includes a washing pool 5A for storing washing water and shower pipes 5B and 5 for ejecting washing water.
C. The underwater roll 8 is disposed in the washing pool 5A, and the filter cloth belt 1 guided by the underwater roll 8 is configured to be washed with the washing water in the washing pool 5A. Also, the shower pipe 5B,
5C is an underwater roll 8 to a felt roll 9 above it.
The filter cloth belt 1 is separately disposed on the front side and the back side of the filter cloth belt 1 facing upward, and the cleaning water is sprayed on the front side and the back side of the filter cloth belt 1 to wash the filter cloth belt 1. In addition,
In order to collect the water dripped from the throttle unit 6 into the cleaning pool 5A, a chute unit 5D protruding below the throttle unit 6 protrudes from the cleaning pool 5A.

A pair of squeeze rolls 6A and 6B constituting the squeezing section 6 are controlled by a pressure adjusting section 19 shown in FIG.
The pressing pressure is adjusted to such an extent that water is squeezed from the washed filter cloth belt 1. The pressure adjusting section 19 includes a swing arm 19A and a support arm 19 similar to the pressure adjusting section 17.
B and the pneumatic cylinder device 19C, and a detailed description thereof will be omitted. In addition, although the peripheral surface of the squeeze rolls 6A and 6B is usually a smooth surface, a plurality of drainage guide grooves may be formed on the peripheral surface.

The filter cloth belt type dewatering apparatus according to one embodiment configured as described above is for dehydrating a sludge-like dewatering target material S and recovering a cake-like processing material C having a low water content. Used for In this use, the material S to be dewatered is sequentially and continuously supplied via a supply box 13 to the upper surface side of the filter cloth belt 1 which is transported in the direction of the arrow in FIGS. It passes through the negative pressure dewatering unit 2 together with the cloth belt 1 and is transferred to the pressure dewatering transfer unit 3.

When the material S to be dewatered on the filter cloth belt 1 sequentially passes above the first suction box 2A and the second suction box 2B of the negative pressure dewatering section 2, the first suction box 2A is moved to the position shown in FIG. As shown, for example, 7 kP
A suction negative pressure of about a is applied to the object S to be dehydrated from the lower surface side of the filter cloth belt 1. Along with this, the water in the material S to be dehydrated permeates the filter cloth belt 1. At this time, as shown in FIG. 4, the outer surface layer 1A of the filter cloth belt 1 composed of the ultrafine fiber layer allows only moisture to permeate by the capillary phenomenon, and the material S to be dehydrated is removed.
Is filtered. Further, an intermediate layer 1 composed of a medium-fine fiber layer
C promotes the permeation of moisture by capillary action. And
The inner surface layer 1B composed of the base fabric layer promotes drainage.

On the other hand, the second suction box 2B applies a suction negative pressure of, for example, about 25 kPa to the material S to be dehydrated from the lower surface side of the filter cloth belt 1. Along with this, the filter cloth belt 1 efficiently allows only moisture in the material S to be dehydrated to pass through utilizing the capillary phenomenon as described above, and reliably filters the material S to be dehydrated by the outer surface layer 1A. . In this way, the filter cloth belt 1 efficiently and reliably dehydrates the object S to be dehydrated without clogging. The water in the material to be dehydrated S sucked into the first suction box 2A and the second suction box 2B is collected in the collection tank 2D via the drain pipe 2C shown in FIG.

As shown in FIG. 5, the object S to be dewatered on the filter cloth belt 1 that has been initially dewatered by the negative pressure dewatering unit 2 is a press top roll 3A and a press bottom roll 3B of the pressure dewatering transfer unit 3. And dehydration under pressure. At this time, the press-top roll 3A transfers the dehydrated processed material C to the peripheral surface formed by pressing the material S to be dehydrated on the smooth surface formed on the peripheral surface.

On the other hand, in the press bottom roll 3B, a flexible tube 3D which is externally mounted on the shoe roll 3C while being rotatably supported by the rotating ring 3H and floatingly supported on the peripheral surface of the shoe roll 3C by oil. By pressing against the filter cloth belt 1, the shoe roll 3C rotates in the circumferential direction along the circumferential shape of the shoe roll 3C. And this flexible tube 3D
The filter cloth belt 1 is pressed by a pressing portion 3D2 having a predetermined area along the pressing concave surface 3C2 of the shoe roll 3C, and a plurality of notch guide grooves (not shown) formed on the outer peripheral surface of the filter cloth belt 1
Promotes drainage of water that permeates.

Press top roll 3 of pressure dehydration transfer part 3
The processed material C transferred to the peripheral surface of A is scraped off by the doctor 4A of the processed material recovery unit 4, and is recovered in the recovery box 4B via the chute 4C. The recovered cake-like processed material C is in the form of flakes having a low water content of about 0.5 to 2 mm, and is easy to handle because of excellent air permeability. Further, since the water content is low, a drying step and a drying apparatus as a post-step are not required.

The filter cloth belt 1 from which the processing object C has been peeled off after passing through the pressure dewatering / transferring unit 3 is cleaned by the cleaning unit 5 so that a new dewatering target material S can be supplied to its upper surface. And is squeezed by the squeezing section 6. That is, the cleaning pool 5A of the cleaning unit 5 immerses the filter cloth belt 1 in the cleaning water therein to perform cleaning, and the shower pipes 5B and 5C eject cleaning water to the outer surface and the inner surface of the filter cloth belt 1 for cleaning. Then, the squeeze rolls 6A and 6B of the squeezing section 6 pass through the filter cloth belt 1 while applying a predetermined pressing pressure, thereby narrowing the filter cloth belt 1 to such an extent that the capillary phenomenon can be maintained.

The filter cloth belt type dewatering device according to one embodiment has a simple structure in which a single filter cloth belt 1 is wound so as to be transportable, but can remove various slurry-like or sludge-like materials S to be dewatered. Dehydration can be performed efficiently. The dehydrated cake-like processed material C is easy to handle because it exhibits a flake shape with a low moisture content, has good air permeability, and does not require post-treatment drying.

Further, in the filter cloth belt type dewatering apparatus of one embodiment, the outer layer 1A composed of an ultrafine fiber layer, the intermediate layer 1C composed of a medium fine fiber layer, and the base cloth layer. Filter cloth belt 1 is made of a three-layered felt material with inner layer 1B.
The fine particles in the material S to be dehydrated can be crosslinked and aggregated on the outer surface layer 1A.

In particular, in the filter cloth belt type dewatering apparatus of one embodiment, the flexible tube 3D of the press bottom roll 3B is connected to the pressurized concave surface 3C of the shoe roll 3C.
The filter cloth belt 1 is pressed to the press top roll 3A side by a pressurizing portion 3D2 having a predetermined area along 2. Therefore, according to the filter cloth belt type dewatering apparatus of one embodiment, the transfer speed of the filter cloth belt 1 can be increased while ensuring sufficient dewatering time of the material S to be dewatered, and the apparatus configuration is enlarged. Without performing, the amount of dehydration treatment of the material to be dehydrated S can be increased.

Also, in the filter cloth belt type dewatering apparatus of one embodiment, since the press top roll 3A is driven to rotate in the transfer direction of the filter cloth belt 1, a separate drive for transferring the filter cloth belt 1 is provided. No roller is required, and the device configuration can be simplified and downsized. Furthermore, since the center distance between the press top roll 3A and the press bottom roll 3B is configured to be adjustable by the pressure adjusting unit 17, it is possible to adjust the pressing force of the material S to be dewatered and the filter cloth belt 1. it can.

[0043]

As described above, in the filter cloth belt type dewatering apparatus according to the present invention, a slurry-like or sludge-like dewatering is carried out on a felt-made filter cloth belt which is wound endlessly and sequentially transferred. When the processed material is supplied, the press top roll and the press bottom roll press the dewatered material together with the filter cloth belt to dehydrate. At this time, the press top roll transfers the dehydrated processed material to the peripheral surface by pressing the material to be dehydrated on the smooth surface formed on the peripheral surface. On the other hand, the press bottom roll rotates in the circumferential direction along the circumferential surface shape of the shoe roll when the flexible tube provided on the shoe roll is pressed against the filter cloth belt. Then, the flexible tube presses the filter cloth belt with a pressurized portion having a predetermined area along the pressurized concave surface of the shoe roll, and a plurality of drain guide grooves formed on the outer peripheral surface of the flexible tube press the water passing through the filter cloth belt. Promotes drainage. That is, according to the first invention, the flexible tube of the press bottom roll presses the filter cloth belt toward the press top roll at a pressurized portion having a predetermined area along the pressurized concave surface of the shoe roll. The transport speed of the filter cloth belt can be increased while sufficiently securing the dewatering time, and the amount of dewatering of the material to be dewatered can be increased without increasing the size of the apparatus configuration.

In the filter cloth belt type dewatering apparatus of the present invention,
When the press top roll is configured to be rotatable in the transport direction of the filter cloth belt, a separate drive roller for transporting the filter cloth belt is not required, and the apparatus configuration can be simplified and downsized. it can.

Further, in the filter cloth belt type dewatering apparatus of the present invention, when the center distance between the press top roll and the press bottom roll is configured to be adjustable, the pressing force of the material to be dewatered and the filter cloth belt is adjusted. Can be adjusted.

[Brief description of the drawings]

FIG. 1 is a front view showing the overall structure of a filter cloth belt type dehydrator according to an embodiment of the present invention.

FIG. 2 is a front view schematically showing a wound state of a filter cloth belt of the filter cloth belt type dehydrator according to one embodiment of the present invention.

FIG. 3 is a partial perspective view showing a layer structure of a filter cloth belt of the filter cloth belt type dewatering device according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating an operation of a negative pressure dehydrator of a filter cloth belt type dehydrator according to one embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating the structure and operation of a press top roll and a press bottom roll of the filter cloth belt type dewatering apparatus according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a structure of a press bottom roll of the filter cloth belt type dewatering apparatus according to one embodiment of the present invention.

[Explanation of symbols]

 1: Filter cloth belt 2: Negative pressure dewatering unit 3: Pressurized dewatering transfer unit 3A: Press top roll 3B: Press bottom roll 3C: Shoe roll 3C2: Pressurized concave surface 3D: Flexible tube 3D2: Pressurized part 4: Processing Material recovery section 5: Cleaning section 6: Narrow section 17: Pressure adjustment section

Continuing on the front page (72) Inventor Koichi Terabun 1-6-1 Nihonbashi Honcho, Chuo-ku, Tokyo FDI term in TDD Corporation (reference) 4D026 BA03 BB05 BC12 BC33 BD06 BE06 BF12 BH03

Claims (3)

[Claims] 1. A filter cloth belt-type dewatering apparatus of a type in which a filter cloth belt made of felt capable of filtering a slurry-like or sludge-like material to be dewatered is wound endlessly and transferred sequentially. A press top roll and a press bottom roll for pressurizing and dewatering the material to be dewatered supplied on the filter cloth belt together with the filter cloth belt, wherein the press top roll is rotatably supported, and The peripheral surface for pressing the material is formed in a smooth surface so as to transfer the dehydrated processed material, the press bottom roll,
A shoe roll which is non-rotatably supported and has a pressurized concave surface formed on the peripheral surface thereof, which has an arc-shaped cross section facing the peripheral surface of the press top roll and extends in the axial direction, and a peripheral surface of the shoe roll. A flexible tube that is externally rotatable in the circumferential direction along the shape, and that pressurizes the filter cloth belt with a pressurized portion having a predetermined area along the pressurized concave surface of the shoe roll. A filter cloth belt type dewatering apparatus, wherein a plurality of drain guide grooves are formed on the surface. 2. The filter cloth dewatering apparatus according to claim 1, wherein said press-top roll is configured to be rotatable in a direction in which said filter cloth belt is transported. Belt type dehydrator. 3. The filter cloth belt type dewatering apparatus according to claim 1, wherein the center distance between the press top roll and the press bottom roll is adjustable. Filter cloth belt type dehydrator.