阅读说明：本技术 固液分离装置及过滤装置 (Solid-liquid separation device and filter device ) 是由 岛田纯 须贺利大 陈贵吉 栗田新平 古川智浩 于 2019-02-28 设计创作，主要内容包括：本发明的固液分离装置,在沿圆周方向旋转的分离辊(7)的外周缠绕有过滤带(1)、密封带(8)和压榨带(15)并能够沿分离辊(7)的旋转方向行进,被供给到过滤带(1)与密封带(8)之间的被处理物(P)在分离辊(7)的外周被夹入过滤带(1)与密封带(8)之间并被压榨带(15)压榨,通气气体经由形成在该分离辊(7)的内周部的通气气室(10),向分离辊(7)的径向外周侧喷出并被通气而进行脱液,其中,密封带(8)为复丝的织物或复丝与单丝组合而成的织物,密封带(8)比压榨带(15)薄。(A solid-liquid separator in which a filter belt (1), a seal belt (8), and a press belt (15) are wound around the outer periphery of a separation roll (7) rotating in the circumferential direction and can travel in the rotation direction of the separation roll (7), a material (P) to be treated which is supplied between the filter belt (1) and the seal belt (8) is sandwiched between the filter belt (1) and the seal belt (8) at the outer periphery of the separation roll (7) and pressed by the press belt (15), and an air is ejected to the radially outer peripheral side of the separation roll (7) via an air chamber (10) formed at the inner peripheral portion of the separation roll (7) and is ventilated to carry out liquid removal, wherein the seal belt (8) is a woven fabric of multifilament or a woven fabric in which a seal belt and monofilament are combined, and the seal belt (8) is thinner than the press belt (15).)

1. A solid-liquid separator, wherein a ring-shaped filter belt is wound around the outer periphery of a separator roll rotating in the circumferential direction, a seal belt is wound around the outer periphery of the filter belt, a press belt is wound around the outer periphery of the seal belt, and the filter belt, the seal belt, and the press belt can travel in the rotating direction of the separator roll,

the object to be treated fed between the filter belt and the seal belt is sandwiched between the filter belt and the seal belt on the outer periphery of the separation roll and pressed by the press belt, and a ventilation gas is ejected to the radial outer peripheral side of the separation roll via a ventilation air chamber formed on the inner peripheral portion of the separation roll and ventilated to perform liquid removal,

the sealing tape is a multifilament fabric or a fabric obtained by combining multifilaments and monofilaments, and is thinner than the press tape.

2. The solid-liquid separation apparatus according to claim 1, wherein the thickness of the seal tape is 3mm or less.

3. The solid-liquid separator according to claim 1 or 2, wherein the air permeability of the sealing tape is higher than that of the filter tape and is 5cc/cm²Min-1000 cc/cm²In the range of/min.

4. The solid-liquid separation device according to any one of claims 1 to 3, wherein the press belt has an air permeability of 3000cc/cm²More than one minute.

5. The solid-liquid separation device according to any one of claims 1 to 4, wherein the press belt is broken under a tensile stress of 20N/mm or more when a tensile stress acts thereon.

6. The solid-liquid separation device according to any one of claims 1 to 5, wherein the warp of the press belt is a polyarylate fiber or a polyparaphenylene benzobisoxazole fiber.

7. The solid-liquid separation device according to any one of claims 1 to 6, wherein the filter belt is one of a woven fabric of multifilament, a woven fabric of monofilament, and a woven fabric of spun yarn, or a woven fabric in which at least two of multifilament, monofilament, and spun yarn are combined.

8. A filter device for supplying an object to be processed from a supply unit to a filter cloth wound around a plurality of rollers and filtering the object by a filter unit provided on a side of the supply unit closer to a traveling direction of the filter cloth,

the solid-liquid separator according to any one of claims 1 to 7 is disposed on the side of the filter unit in the traveling direction, wherein the roller located on the side of the filter unit in the traveling direction is the separation roller, and the filter cloth is the filter belt.

Technical Field

The present invention relates to a solid-liquid separator in which a filter belt, a seal belt, and a press belt are wound around the outer periphery of a separation roller in this order, and a treated object fed between the filter belt and the seal belt is pressed by the press belt, and liquid is removed by ventilation with a ventilation gas discharged from the separation roller, and a filter apparatus provided with the solid-liquid separator.

This application is based on the application 2018-229943, which was filed in japanese application at 12/7/2018, and the contents of which are incorporated herein by reference.

Background

As such a solid-liquid separator, for example, patent document 1 describes a solid-liquid separator in which a pair of annular separation filter cloths (a filter belt and a seal belt) are superposed on and wound around the outer periphery of a separation roller rotating in the circumferential direction, a press belt is further wound around the outer periphery of the pair of separation filter cloths, the pair of separation filter cloths and the press belt are allowed to travel in the rotation direction of the separation roller, a material to be treated supplied between the pair of separation filter cloths is sandwiched between the separation filter cloths and pressed by the press belt on the outer periphery of the separation roller, and an air-permeable gas is ejected to the radially outer peripheral side of the separation roller and is ventilated through an air-permeable gas chamber formed in the inner peripheral portion of the separation roller to perform liquid removal.

Similarly, patent document 1 also discloses a filter device in which an object to be treated is supplied from a supply means onto a filter cloth running wound around a plurality of rollers, and the object to be treated is filtered by a filter means provided on a running direction side of the filter cloth with respect to the supply means, wherein the solid-liquid separation device is provided on the running direction side with respect to the filter means, a roller positioned on the running direction side with respect to the filter means among the plurality of rollers is the separation roller, and the filter cloth is the filter belt.

Patent document 1: japanese patent No. 4381462

In the solid-liquid separator described in patent document 1, the separation roll is sandwiched between the filter belt and the seal belt wound around the outer periphery of the separation roll, and further, the press belt is wound around the outer periphery of the seal belt, and the treated object is ventilated and deliquored by the ventilation gas jetted from the inner periphery of the separation roll, and three belts are stacked with the treated object sandwiched therebetween.

Therefore, particularly in the seal tape located at the innermost periphery and the seal tape located between the filter tape and the object to be treated, a circumferential speed difference is generated due to the thickness of the object to be treated, and a step difference is formed at both end portions in the tape width direction, so that wrinkles are likely to be generated on the seal tape. When wrinkles are formed in the sealing tape in this manner, the sealing tape may be bent from the wrinkled portion by the pressure applied by the press belt, and the sealing tape may be broken during the long-term solid-liquid separation.

Disclosure of Invention

The present invention has been made under such a background, and an object thereof is to provide a solid-liquid separation device and a filter device that can prevent a seal tape from being broken even if solid-liquid separation is performed for a long time by suppressing the generation of wrinkles on the seal tape.

The solid-liquid separator of the present invention is a solid-liquid separator in which a ring-shaped filter belt is wound around the outer periphery of a separator roll rotating in the circumferential direction, a seal belt is wound around the outer periphery of the filter belt, a press belt is wound around the further outer periphery of the seal belt, the filter belt, the seal belt, and the press belt can travel in the rotation direction of the separator roll, are supplied to a treatment object between the filter belt and the seal belt, are sandwiched between the filter belt and the seal belt on the outer periphery of the separator roll and pressed by the press belt, and an air is ejected to the radially outer peripheral side of the separator roll through an air chamber formed in the inner periphery of the separator roll and is ventilated to perform liquid removal, wherein the seal belt is a woven fabric of multifilament or a woven fabric in which multifilament and monofilament are combined, and the seal belt is thinner than the press belt.

In the filter device of the present invention, an object to be treated is supplied from a supply unit onto a filter cloth running wound around a plurality of rollers, and the object to be treated is filtered by a filter unit provided on a side of the filter cloth in a running direction of the filter cloth with respect to the supply unit, wherein the solid-liquid separator is provided on the side of the filter unit in the running direction, a roller of the plurality of rollers positioned on the side of the filter unit in the running direction is the separation roller, and the filter cloth is the filter belt.

In the solid-liquid separator and the filtering apparatus having the above-described configuration, since the seal tape of the solid-liquid separator is thinner than the press belt and is a woven fabric of multifilament or a woven fabric of multifilament and monofilament in combination, when the object to be treated is pressed by the press belt, the seal tape and the press belt are well adapted to each other and have high followability. Therefore, the occurrence of wrinkles in the seal tape can be suppressed, and the seal tape can be prevented from being broken due to the wrinkles for a long period of time. In order to reliably prevent the occurrence of wrinkles in the seal tape, the thickness of the seal tape is preferably 3mm or less.

The air permeability of the sealing tape is set to be higher than that of the filter tape and is 5cc/cm²Min-1000 cc/cm²In the range of/min, clogging of the seal tape can be prevented, and efficient solid-liquid separation can be performed. When the air permeability of the sealing tape is below that of the filter tape, or less than 5cc/cm²In the case of the second aspect, the sealing tape is likely to have a clogged hole, and it is difficult to separate the liquid component from the object to be treated. However, when the air permeability of the seal tape exceeds 1000cc/cm²In minute time, the strength of the seal tape is impaired, breakage easily occurs, and the treated matter and liquid are formed by aerationThe components leak together through the seal tape, and thus the recovery rate of the processed object is lowered.

On the other hand, the air permeability of the press belt is preferably 3000cc/cm²More than one minute. When the air permeability of the press belt is less than 3000cc/cm²In the time division, it is difficult for the ventilation gas to pass through the press belt, and the press belt is likely to be clogged, and there is a possibility that the liquid component separated from the object to be treated by the seal tape cannot be efficiently removed.

When the press belt is subjected to tensile stress, it is preferably broken under tensile stress of 20N/mm or more. By preventing the press belt from breaking under such high tensile stress, the ejection pressure of the ventilation gas can be increased, and efficient solid-liquid separation can be promoted. In order to ensure such high tensile stress resistance, the press belt preferably has a polyarylate fiber or polyparaphenylene benzobisoxazole fiber as a warp.

Further, the filter belt is preferably one of a multifilament woven fabric, a monofilament woven fabric, and a spun yarn (スパンテーブル) woven fabric, or a woven fabric in which at least two of a multifilament, a monofilament, and a spun yarn are combined. As a result, even if the discharge pressure of the ventilation gas is increased as described above, damage to the filter belt due to discharge of the ventilation gas can be prevented, the frequency of replacement of the filter belt can be reduced, efficient solid-liquid separation can be more reliably promoted, and the filter belt is economical.

As described above, according to the present invention, it is possible to suppress the occurrence of wrinkles in the seal tape, prevent the seal tape from being broken due to the wrinkles for a long period of time, prevent the filter tape and the press tape from being damaged, and realize efficient solid-liquid separation.

Drawings

Fig. 1 is a side view showing a schematic configuration of one embodiment of a filter device of the present invention.

FIG. 2 is a side view showing an embodiment of the solid-liquid separator of the present invention used in the filtration apparatus shown in FIG. 1.

Fig. 3 is a partially broken rear view of the solid-liquid separation device shown in fig. 2, as viewed from the right side of fig. 2.

Detailed Description

Fig. 1 to 3 show one embodiment of a solid-liquid separation device and a filtration device provided with the solid-liquid separation device according to the present invention. As shown in fig. 1, the solid-liquid separator of the present embodiment includes a filter belt 1, a roll 2, a separation roll 7, a seal belt 8, a ventilation air chamber 10, and a press belt 15.

The filter device in the present embodiment is a structure of a horizontal vacuum filter device, and as shown in fig. 1, a ring-shaped filter belt 1 is pulled to be wound around a plurality of rollers 2 whose central axes are arranged horizontally in parallel to each other, one of which is set as a driving roller 2A and is rotationally driven around the central axis. Thereby, the horizontal portion 1A of the filter belt 1 horizontally transferred to the upper portion of the apparatus can be made to travel so as to move in the traveling direction indicated by the arrow F. The object P to be treated fed from the feeding unit 3 disposed on the rear side of the horizontal portion 1A in the traveling direction F passes through the filter unit 4 disposed between the feeding unit 3 and the driving roller 2A disposed on the traveling direction F and is filtered by the filter belt 1.

Here, the drive roller 2A is positioned at an end portion of the horizontal portion 1A on the traveling direction F side, and as shown in fig. 2, the drive roller is rotated by a variable reduction gear 6 by a drive unit 5 such as a motor, thereby intermittently traveling the filter belt 1 at a continuous or predetermined pitch. In the filter unit 4, the object P to be treated passes through a vacuum tray, not shown, which supports the filter belt 1 in the horizontal portion 1A, and the liquid component is sucked and filtered by the filter belt 1. As shown by the broken line in fig. 1, a solid-liquid separator according to an embodiment of the present invention is further disposed on the side of the filter unit 4 in the traveling direction F.

In the solid-liquid separator of this embodiment, as shown in fig. 2 and 3, a ring-shaped filter belt 1 and a seal belt 8 are wound around the outer periphery of a separation roller 7 rotating in the circumferential direction in the rotation direction T, and the object P to be treated filtered by the filter unit 4 is sandwiched between the filter belt 1 and the seal belt 8 and can travel in the rotation direction T. Here, in the present embodiment, the drive roller 2A of the roller 2 in the filter device is a separation roller 7, and the filter belt 1 of the filter device is directly wound around the separation roller 7.

The separation roller 7 (drive roller 2A) is formed in a substantially hollow cylindrical shape, and as shown in fig. 3, a plurality of through holes 9 are opened in the cylindrical surface portion of the separation roller 7 on the inner side in the central axis direction of the separation roller 7 than the width range of the separation roller 7 and on the entire circumference of the separation roller 7 in the circumferential direction. On the other hand, a plurality of ventilation air chambers 10 communicating with the through holes 9 are formed in the inner peripheral portion of the separation roller 7 so as to be spaced apart from each other in an arc shape so as to divide the inner peripheral portion of the separation roller 7 into substantially equal intervals in the circumferential direction, in a range substantially equal to the range in which the through holes 9 are formed in the central axis direction, and in the entire circumference of the separation roller 7 in the circumferential direction.

Further, the same number of aeration pipes 11 as the number of aeration air chambers 10 are inserted from one end side in the central axis direction (the right side in fig. 3) in the further inner peripheral portion of the separation roller 7 and connected to the respective aeration air chambers 10, and aeration gas a such as air (compressed air) or steam supplied to the aeration pipes 11 is ejected from the through holes 9 to the outer periphery of the separation roller 7 via the aeration air chambers 10 and is aerated. The ventilation gas a is supplied from a supply source (not shown) to a ventilation pipe 11 fixed to the rotating separation roller 7 via a rotary joint (or a multi-stage rotary joint) 12.

Further, an automatic valve 13 is provided for each of the ventilation pipes 11 between the ventilation gas branching chamber 12A on the separation roller 7 side connected to the rotary joint 12 and each of the ventilation pipes 11. Here, the opening and closing operations of the automatic valve 13 are controlled as follows: that is, the open/close operation of the automatic valve 13 is controlled by the limit switch 13A attached to the separation roller 7 and operated in accordance with the rotational position of each ventilation air chamber 10, so that the ventilation gas a from the ventilation gas branch chamber 12A is supplied or not supplied to the automatic valve 13 as the signal gas via the supply pipe 13B.

Further, with the automatic valve 13 controlled in this way, the present embodiment is structured as follows: that is, the ventilation air chamber 10 located in the range in which the filter tape 1 and the seal tape 8 are wound in the circumferential direction of the separation roller 7 is continuously supplied while sequentially switching the ventilation air a with the rotation of the separation roller 7 only for the ventilation air chamber 10 located at a predetermined rotational position. Namely, the following control is performed: when the ventilation air chamber 10 is at the predetermined rotational position, the automatic valve 13 is opened, the ventilation gas a is always supplied to the ventilation air chamber 10 and discharged from the through hole 9, and on the other hand, at a position other than the predetermined rotational position, the automatic valve 13 is closed and ventilation is not performed.

On the other hand, the seal tape 8 has a width substantially equal to that of the filter tape 1, is wound around the outside of the filter tape 1 on the outer periphery of the separation roller 7, and is movable in the same traveling direction G as the traveling direction F integrally with the filter tape 1 in the rotating direction T of the separation roller 7 (drive roller 2A). In the traveling direction G, as shown in fig. 2, the roll 2B on which the seal tape 8 is wound following the separation roll 7 is common to the roll 2 on which the filter tape 1 is wound, and the seal tape 8 is pulled out downward from the roll 2B to the opposite side of the filter tape 1, separated from the filter tape 1, and wound around the plurality of rolls 14 in a ring shape and rewound around the outer periphery of the separation roll 7.

And, on the outer periphery of the separation roll 7 thus wound with the filter belt 1 and the seal belt 8 in superposition, wherein a press belt 15 is wound on the further outer periphery of the seal belt 8. The press belt 15 can also run on the outer circumference of the separation roll 7 together with the filter belt 1 and the sealing belt 8 in the same running direction H as the running direction F, G in its direction of rotation T.

In the present embodiment, the press belt 15 is formed to have a width wider than that of the filter belt 1 and the seal belt 8, and as shown in fig. 3, both ends in the width direction of the press belt 15 are wound around the separation roll 7 so as to cover the filter belt 1 and the seal belt 8, respectively, across both ends in the width direction of the filter belt 1 and the seal belt 8. However, if the width of the press belt 15 in the transverse direction is wider than the width of the filter cake of the object P to be pressed sandwiched between the filter belt 1 and the seal belt 8, the width does not necessarily need to be wider than the filter belt 1 and the seal belt 8, that is, the width of the press belt 15 may be substantially equal to or narrower than the widths of the filter belt 1 and the seal belt 8.

Further, in the traveling direction H, the press belt 15 is wound around the common roll 2B around which the filter belt 1 and the seal belt 8 are wound after the separation roll 7, and then sequentially wound around a plurality of rolls 16 disposed between the separation roll 7 and the seal belt 8 wound around the roll 14, as shown in fig. 2. Thereafter, before reaching the separation roller 7, the sealing tape 8 is wound around the roller 14A around which the sealing tape 8 is wound, together with the sealing tape 8, and is wound around the outer periphery of the separation roller 7 again in a ring shape.

The rolls 2B, 14A, and 16 around which the press belt 15 is wound have a larger diameter than the roll 2 around which only the filter belt 1 is wound and the roll 14 around which only the seal tape 8 is wound, and have a smaller diameter than the separation roll 7. Further, one of the plurality of rollers 16 is attached to an arm 17C of a compression belt tension device 17 rotatable about a support shaft 17A by an air cylinder device 17B, and by positioning the arm 17C at a predetermined position by rotating the arm, a predetermined tension is applied to the press belt 15.

Further, another roll of the plurality of rolls 16 is attached to a holder 18B of the press belt meandering correction device 18, and at least one end of the press belt meandering correction device 18 is also advanced and retreated in the running direction H of the press belt 15 by the cylinder device 18A, so that the inclination of the roll 16 with respect to the running direction H is finely adjusted by advancing and retreating the holder 18B in the running direction H, and the meandering is corrected when the meandering occurs in the running of the press belt 15. However, in the filtering apparatus and the solid-liquid separator of the present embodiment including these rollers 16, all of the rollers 2, 14, and 16 other than the driving roller 2A (the separation roller 7) are driven rollers not coupled to the driving means.

Further, a press belt cleaning device 19 is provided on the running path of the press belt 15, a separated filter cloth cleaning device 20 is provided on the running path of the seal belt 8, and a cleaning device not shown is also provided on the running path of the filter belt 1. Further, a receiving pan 21 is disposed at the bottom of the solid-liquid separation apparatus. Further, a discharge port 22 is provided below the roller 2B, and the discharge port 22 discharges a cake of the treatment object P subjected to solid-liquid separation by the solid-liquid separator.

Further, a scraper 23, a wire, or the like is disposed on the filter belt 1 and the seal belt 8 which are separately advanced in opposite directions from the roller 2B toward the advancing direction F, G, so as to contact the surface of the filter belt which contacts the object P to be treated. Further, a recovery plate 24 having an arc-shaped cross section is disposed at a position closer to the outer periphery of the portion of the separation roll 7 around which the filter belt 1, the seal belt 8, and the press belt 15 are wound, with a gap from the press belt 15, and the liquid component separated by the ventilation is recovered and guided to the receiving tray 21.

In the solid-liquid separator and the filter device having such a structure, the seal tape 8 is a woven fabric of multifilament or a woven fabric of a combination of multifilament and monofilament, and is thinner than the press tape 15. The thickness of the sealing tape is preferably 3mm or less. The air permeability of the seal tape 8 is preferably higher than that of the filter tape 1 and is preferably 5cc/cm²Min-1000 cc/cm²In the range of/min.

On the other hand, the air permeability of the press belt 15 is preferably 3000cc/cm²More than one minute. The press belt 15 preferably has a strength to break under a tensile stress of 20N/mm or more when the tensile stress is applied. The press belt 15 preferably has a warp of polyarylate fiber or polyparaphenylene benzobisoxazole fiber. The filter belt 1 is preferably one of a multifilament woven fabric, a monofilament woven fabric, and a spun woven fabric, or a woven fabric obtained by combining at least two of a multifilament, a monofilament, and a spun yarn.

In one embodiment of such a solid-liquid separation apparatus and a filtration apparatus, the object P to be treated filtered by the filtration unit 4 of the filtration apparatus is sandwiched between the filter belt 1 and the seal belt 8 on the outer periphery of the separation roller 7 of the solid-liquid separation apparatus, and further, the press belt 15 is wound around the outer periphery thereof with high tension, and is pressed and drained by a pressing force applied to the inner periphery side in the radial direction of the separation roller 7. Therefore, the liquid component of the object P can be removed more effectively by the liquid removing action of the ventilation gas a ejected from the through holes 9 formed in the separation roller 7 and the liquid removing action by the pressing of the press belt 15, and the load in the drying step can be reduced even when the drying step is provided in the stage subsequent to the solid-liquid separation step performed on the object P by the solid-liquid separation apparatus.

The filter belt 1, the seal belt 8, and the press belt 15, which sandwich the object P to be processed and are wound around the separation roller 7, are different in distance from the center axis of the separation roller 7 depending on the thickness of the object P to be processed, and the filter belt 1 is directly wound around the separation roller 7 (the driving roller 2A) and travels, whereas the seal belt 8 and the press belt 15 are passively traveled by the filter belt 1 and the object P to be processed. Therefore, a circumferential speed difference is generated between the filter belt 1 and the seal belt 8 on the outer periphery of the separation roll 7, and a shearing force to be sheared in the circumferential direction acts on the object P due to the circumferential speed difference, and the object P is effectively squeezed and drained by the shearing force and the pressing force.

In the solid-liquid separator and the filtering apparatus having the above-described configuration, since the seal tape 8 of the solid-liquid separator is thinner than the press belt 15 and is a woven fabric of multifilament or a woven fabric of a combination of multifilament and monofilament, when the object P is pressed by the press belt 15 through the seal tape 8, the seal tape 8 is well adapted to the press belt 15 and has high followability. Therefore, even if a circumferential speed difference is generated between the filter belt 1 and the seal tape 8 as described above or a step difference is formed at both end portions in the width direction (the central axis direction of the separation roller 7) of the filter belt 1 and the seal tape 8 depending on the thickness of the object P to be treated, the generation of wrinkles in the seal tape 8 can be suppressed.

Therefore, according to the solid-liquid separation device and the filtration device, the following situation can be prevented from occurring: in this case, the wrinkle portion is bent by the pressure applied by the press belt 15 and is broken early in the process of performing the solid-liquid separation for a long time. Therefore, according to the solid-liquid separation device and the filtration device having the above-described configuration, stable solid-liquid separation can be performed for a long period of time, and high efficiency and economical efficiency can be achieved.

In order to reliably prevent the sealing tape 8 from being wrinkled and early broken, the thickness of the sealing tape 8 is preferably 3mm or less, as described above. When the thickness of the seal tape 8 is thicker than 3mm, wrinkles are generated and it is difficult to restore the original shape when a fold is formed, and a fracture easily occurs from the folded portion.

Further, in order to prevent the sealing tape 8 from being broken and to achieve more efficient solid-liquid separation, the permeability of the sealing tape 8 is preferably higher than that of the filter tape 1 and is 5cc/cm²Min-1000 cc/cm²In the range of/min. When the air permeability of the sealing tape 8 is filteringThe air permeability of the belt 1 is less than or equal to 5cc/cm²At time/minute, the pores of the seal tape 8 are easily clogged, and it may be difficult to efficiently separate the liquid component from the treatment object P. On the other hand, when the air permeability of the seal tape 8 exceeds 1000cc/cm²In the time division, the strength of the seal tape 8 is impaired, breakage easily occurs, and the treatment object P leaks through the seal tape 8 together with the liquid component due to ventilation, so that the recovery rate of the treatment object P is lowered.

The air permeability of the press belt 15 is preferably 3000cc/cm²More than one minute. When the air permeability of the press belt 15 is less than 3000cc/cm²In the time division, the ventilation gas a is difficult to pass through the press belt 15, and the perforations of the press belt 15 are easily clogged, and there is a possibility that the liquid component separated from the object P to be treated cannot be efficiently removed from the seal tape 8 through the press belt 15.

Further, the press belt 15 preferably has a strength to break under a tensile stress (tension) of 20N/mm or more when a tensile stress acts thereon. By preventing the press belt 15 from breaking under such high tensile stress, the ejection pressure of the ventilation gas a can be increased, and thus efficient solid-liquid separation can be further promoted.

Here, in order to secure the strength of the press belt 15 so as not to break even under such a high tensile stress, the warp of the press belt 15 is preferably polyarylate fiber or polyparaphenylene benzobisoxazole fiber. Further, since a tensile stress as high as that of the weft does not act, it is not particularly limited as long as it has a normal strength.

Further, the filter belt 1 is preferably one of a multifilament woven fabric, a monofilament woven fabric, and a spun woven fabric, or a woven fabric in which at least two of the multifilament, the monofilament, and the spun yarn are combined. Thus, even if the discharge pressure of the ventilation gas a is increased as described above, damage to the filter belt 1 due to discharge of the ventilation gas a can be prevented, and therefore, the frequency of replacement of the filter belt 1 can be reduced, and efficient solid-liquid separation can be performed more reliably. In addition, the filter belt 1 is less frequently replaced, and therefore, is economical.

By applying the solid-liquid separation device of the present invention to the field, the occurrence of wrinkles in the seal tape can be suppressed, and the seal tape can be prevented from breaking even if the solid-liquid separation is performed for a long time.

Description of the reference numerals

1 Filter belt

2. 14, 16 rollers

2A drive roller

3 supply unit

4 Filter element

7 separation roller

8 sealing tape

9 through hole

10 ventilating air chamber

11 ventilating pipe

13 automatic valve

15 Press Belt

17 press belt tensioning device

A aeration gas

P object to be treated

F direction of travel of the filter belt 1

G direction of travel of sealing strip 8

H direction of travel of the press belt 15

T direction of rotation of the separation roller 7