WO2015064176A1 - Vertical screw-press filtration device - Google Patents

Abstract

This vertical screw-press filtration device is provided with: cylindrical or conical inner and outer filter body (1, 2) centered on an axis line (O) extending vertically; and a ribbon screw (11) that forms a helical shape twisted around the axis line (O), is housed between the inner and outer filter bodies (1, 2), and is rotated around the axis line (O). The inner filter body (1) is affixed in a manner so as to be supported suspended from the top end in the axis line (O) direction by an inner filtration support body (6) provided with an inner cylinder (6A) of which the outer peripheral surface forms a cylindrical surface centered on the axis line (O), the ribbon screw (11) is supported suspended from the top end in the axis line (O) direction in a manner able to rotate around the axis line (O) by a screw support body (12) provided with an outer cylinder (12A) of which the inner peripheral surface forms a cylindrical surface centered on the axis line (O) and is slidably fitted at the outer periphery of the inner cylinder (6A), and as a result, a rise in filtering space (S) is suppressed and the concentricity of the ribbon screw (11), the assembly precision, and the support rigidity at the top can be sufficiently secured.

Description

Vertical screw press filtration device

The present invention provides an inner and outer filter body fixed in a cylindrical shape or a conical shape around an axis extending in the longitudinal direction, and a ribbon that is accommodated between the inner and outer filter bodies and rotated around the axis line. The present invention relates to a vertical screw press type filtration device provided with a screw.
This application claims priority based on Japanese Patent Application No. 2013-226445 filed in Japan on October 31, 2013, the contents of which are incorporated herein by reference.

As such a vertical screw press type filtration device, for example, in Patent Document 1, a coiled ribbon screw arranged vertically or in an inclined manner is provided between a filtration inner cylinder and a filtration outer cylinder arranged concentrically. An apparatus inserted into an annular space is disclosed. In the invention of Patent Document 1, while the object to be processed is conveyed upward by the rotation of the ribbon screw, solid-liquid separation is performed by a filtration inner cylinder and a filtration outer cylinder formed of a mesh member, There has been proposed a vertical screw press type filtration device that discharges a solid content from the upper end and sends it to a discharge pipe.

Japanese Laid-Open Patent Publication No. 9-010522

By the way, in the vertical screw press type filtration device described in Patent Document 1, the filtration inner cylinder is fixed with a lower end connected to a drain pipe that is inserted and attached to the machine base from below, and a ribbon screw. Also, it is attached to the upper surface of the driving wheel that is supported by a lower part of the machine base via a bearing and rotates. The drain pipe is inserted through the inner peripheral portion of the drive wheel so as not to rotate and is connected to the lower end of the filtration inner cylinder. Further, a dewatering plug that rotates in synchronization with the ribbon screw and is separated from the blade portion of the ribbon screw and freely approaches and separates is attached to the upper portion of the ribbon screw.

However, if the ribbon screw is attached to and supported by the upper surface of the drive wheel that rotates through the bearing at the lower part of the machine base in this way, the machine base has a certain size to further support the drive wheel. Therefore, the position of the upper end of the annular space from which the filtered object is discharged must be increased. In particular, as described in Patent Document 1, when the drain pipe to which the lower end of the filtration inner cylinder is connected is inserted into the inner peripheral portion of the drive wheel and the filtration inner cylinder is supported, the lower end of the drain pipe is filtered. The annular space is disposed at a relatively higher position than the lower end of the inner cylinder.

For this reason, the assembly and maintenance of the filtration inner cylinder, the filtration outer cylinder, and the ribbon screw are performed at high places, and workability is reduced. Furthermore, even when the solid content after filtration is transported and collected by a conveyor or the like, the upper end position of the annular space is high, so the conveyor or the like must be disposed at a high place, resulting in an increase in equipment cost. . In addition, there is a possibility that such a conveyor cannot be installed depending on the height of the building where the filtration apparatus is installed. In addition, when supporting the ribbon screw that rotates at the lower end of the annular space and the non-rotating filtration inner cylinder, a complicated support structure and a complicated seal structure are also required so that the object to be processed does not enter between the support structures. It becomes.

On the other hand, in the vertical screw press type filtration device described in Patent Document 1, the dewatering plug can be rotated in synchronization with the ribbon screw as described above, and can be separated and freely separated from the blade portion. Therefore, the upper part of the ribbon screw is merely connected to the shaft part provided at the upper end of the blade part by the ball spline to the boss part of the dewatering plug. For this reason, it becomes difficult to adjust the positions of the ribbon screw and the filtration inner cylinder and the filtration outer cylinder, and sufficient concentricity cannot be obtained. In addition, the assembly of the apparatus is not easy, which may lead to a decrease in assembly accuracy, and the support rigidity at the upper part of the ribbon screw may be insufficient.

The present invention is made under such a background, can suppress an increase in the space for filtration in which the ribbon screw is accommodated, and can improve workability such as assembly and maintenance. It is an object of the present invention to provide a vertical screw press filtration device in which a conveyor or the like for conveying and collecting the processed object can be disposed at a relatively low position. It is another object of the present invention to provide a vertical screw press type filtration device that can sufficiently ensure the concentricity and assembly accuracy of the ribbon screw and the support rigidity at the top.

In order to solve the above-described problems and achieve such an object, the vertical screw press type filtration device according to the present invention is fixed in a cylindrical shape or a conical shape with an axis extending in the vertical direction as a center. An inner filter body, a cylindrical or conical shape coaxial with the inner filter body, an outer filter body fixed at an interval to the outside of the inner filter body, and an inner filter formed in a spiral shape that twists around the axis A ribbon screw that is housed between the body and the outer filter body and is rotated about the axis, and the inner filter body is provided with an inner cylindrical portion having an inner cylindrical portion whose outer peripheral surface forms a cylindrical surface centering on the axis. The ribbon screw is fixed by being suspended and supported from the upper end side in the axial direction via the filtration support, and the inner peripheral surface of the ribbon screw forms a cylindrical surface centering on the axis, Equipped with an outer cylindrical part that is slidably fitted on the outer periphery And through the screw support, it is rotatably supported suspended from the upper end side in the axial direction about the axis.

In the vertical screw press type filtration device configured as described above, the inner filter body is formed through an inner filter support body having an inner cylindrical portion whose outer peripheral surface forms a cylindrical surface with the axis as the center, and a ribbon. Both the screws are supported by being suspended from the upper end side in the axial direction through a screw support having an outer cylindrical portion whose inner peripheral surface forms a cylindrical surface centered on the axis. Accordingly, it is not necessary to provide a complicated support structure or a seal structure for supporting these under the inner filter body and the ribbon screw, and the height of the filtration space in which the ribbon screw is accommodated and the height of the entire apparatus are kept low. be able to.

For this reason, it is possible to easily assemble and maintain the inner filter body and the ribbon screw, and even when the processed material after filtration is discharged from the upper end position of the filtration space and conveyed and collected by a conveyor or the like, By lowering the position of this conveyor, installation can be made relatively simple and at low cost. On the other hand, at the upper part of the ribbon screw, the inner peripheral surface of the outer cylindrical portion of the screw support is slidably fitted to and supported by the outer periphery of the inner cylindrical portion of the inner filtration support. Therefore, since it becomes easy to adjust the position of the ribbon screw and the inner filter body, the concentricity and the assembling accuracy are improved, and the support rigidity of the ribbon screw can be sufficiently secured.

Further, by rotating the ribbon screw via a screw support, it is not necessary to provide a rotating means such as a drive wheel described in Patent Document 1 below the ribbon screw, and the height of the filtration space is further increased. It can be surely kept low. The ribbon screw is rotated while the outer cylindrical portion of the screw support slides on the inner cylindrical portion of the inner filtration support. Accordingly, the support rigidity is ensured and a high strength against the rotational torque can be obtained, and the rotational force can be efficiently transmitted to the ribbon screw.

Furthermore, the outer peripheral surface of the inner filter body can be suspended via the inner filter support body by forming a cylindrical surface centered on an axis having the same outer diameter as the outer peripheral surface of the inner cylindrical portion of the inner filter support body. The inner filter body can be pulled up together with the inner filter support and extracted from the inner periphery of the ribbon screw and the screw support. Therefore, maintenance of the inner filter body can be easily performed.

On the other hand, a plurality of ribbon screws supported by the screw support body are accommodated between the inner filter body and the outer filter body so as to be integrally rotatable with an interval around the axis line, so that the ribbon screw is rotated. Since the rotational torque that acts when the processed material is conveyed can be dispersed in the plurality of ribbon screws, deformation of the ribbon screw can be suppressed. In particular, if the plurality of ribbon screws are arranged at equal intervals, the rotational torque can be evenly distributed, so that more reliable deformation and the like can be prevented.

Also, by accommodating a plurality of ribbon screws in this way, the pitch between the ribbon screws can be reduced without changing the lead of each ribbon screw, so that the filling rate of the object to be processed can be increased. In addition, the number of scraping of the filtration surface of the inner and outer filter bodies due to the rotation of the ribbon screw increases, preventing clogging of the filtration surface and improving the filtration speed, as well as promoting uniform filtration and variation in the moisture content of the workpiece. Can be suppressed.

In this way, even when a plurality of ribbon screws are accommodated so as to be integrally rotatable at intervals, or even when a single ribbon screw is accommodated, the portions facing this ribbon screw in the axial direction are connected by a connecting member. As a result, the strength can be improved and the deformation of the ribbon screw can be prevented more reliably. Further, when the ribbon screw is suspended and supported as described above, a tensile stress acts on the connecting member, so that strength can be secured even with a relatively thin connecting member. Smooth conveyance of processed material is not hindered.

Further, by connecting the lower end portions of the inner filter body and the outer filter body coaxially by an annular member, for example, when the outer filter body is supported by being suspended from the upper end side in the axial direction in the same manner as the inner filter body, It is possible to reliably arrange the filter body around the axial line over the entire length in the axial direction. Therefore, it is possible to improve the assembly accuracy, and it is not necessary to support the lower ends of the inner and outer filter bodies suspended in this manner so as to be coaxial. Further, by sealing the lower end of the filtration space with the annular member, a complicated seal structure for preventing the object to be processed from leaking out of the filtration space becomes unnecessary.

Further, in the present invention, the ribbon screw is also supported by being suspended from the upper end side in the axial direction so as to be rotatable about the axis via the screw support. Thus, even if the lower ends of the inner filter body and the outer filter body are connected coaxially by the annular member, it is possible to avoid the ribbon screw from interfering with the annular member. In particular, when the ribbon screw is rotated through the screw support as described above, it is possible to prevent the rotating means from interfering with the annular member or the inner / outer filter body, and a complicated seal structure or the like is not required.

As described above, according to the present invention, the height of the filtration space in which the ribbon screw is accommodated and the entire filtration device can be kept low, and the workability of assembly and maintenance of the inner filter body and the ribbon screw can be improved. Can be achieved. Further, even when the object to be processed after filtration is discharged from the upper end of the filtration space and conveyed and collected by a conveyor or the like, the conveyor can be installed relatively easily and at low cost. In addition, it is easy to adjust the position of the ribbon screw and the inner filter body, the concentricity and the assembly accuracy are improved, and the support rigidity of the ribbon screw can be sufficiently secured to promote stable filtration. Is possible.

It is a longitudinal cross-sectional view which shows one Embodiment of this invention. It is a partially broken perspective view which shows the inside / outside filter body of embodiment shown in FIG. It is a partially broken perspective view which shows the ribbon screw of embodiment shown in FIG. It is a partially broken perspective view which shows the state by which the ribbon screw was accommodated between the inner and outer filter bodies of embodiment shown in FIG. 1 (however, illustration of a connection member is abbreviate | omitted).

1 to 4 show an embodiment of the present invention. In the present embodiment, the inner filter body 1 and the outer filter body 2 are both cylindrical with an axis O extending in the vertical vertical direction as shown in FIGS. 1 and 2. However, the inner diameter of the outer filter body 2 disposed outside the inner filter body 1 is larger than the outer diameter of the inner filter body 1 disposed radially inward with respect to the axis O. A cylindrical filtration space S with the axis O as the center is formed between the inner and outer filter bodies 1 and 2.

The inner filter body 1 and the outer filter body 2 are respectively constituted by a plurality (two in the present embodiment) of inner filter structures 1A and outer filter structures 2A divided in the axis O direction. Each of these inner and outer filtration components 1A, 2A is configured by attaching a filtering material such as a wire mesh to a main body formed in a cylindrical shape by a perforated metal plate such as punching metal, and each has the same shape and the same size. Is formed. In addition to the punching metal, a screen such as a wedge wire or a wire mesh, a filter cloth, or the like can also be used as the inner and outer filtration structures 1A and 2A.

Further, between the both ends of the main body of the inner and outer filtration structural bodies 1A and 2A in the direction of the axis O and, if necessary, between the inner filtration structural body 1A and the outer filtration structural body 2A so as to protrude to the inner peripheral side Are each provided with an annular plate-like flange portion so as to protrude to the outer peripheral side. In addition, on the inner and outer peripheries of the inner and outer filtration components 1A and 2A, plate-like rib portions extending between the flange portions at both ends along a plane including the axis O are provided.

Among these, the outer filter body 2 includes a plurality of outer filter structures 2A that are coaxially stacked one above the other, and a flange section at the lower end of the upper outer filter structure body 2A and a flange section at the upper end of the lower outer filter structure body 2A. And these flange portions are connected together by bolting or the like to be integrated. Further, the outer filter body 2 has a flange portion at the upper end of the uppermost outer filter structure 2A joined to a substrate 3 laid horizontally at a predetermined height by bolting or the like. The substrate 3 is suspended and supported from the upper end side, and is fixed to the substrate 3.

Here, in the substrate 3, for example, a discharge hole 3A, which is a circular through-hole centered on the axis O, is formed in the central portion of a square plate centered on the axis O. The inner diameter of the discharge hole 3A is substantially equal to the inner diameter of the outer filter body 2, and the upper end of the outer filter body 2 is joined to the peripheral edge of the discharge hole 3A on the lower surface of the substrate 3. Further, the substrate 3 is supported at a predetermined height as described above by joining pillars and the like (not shown) at the four corners of the lower surface thereof.

A cylindrical vertical wall 4A centering on the axis O is erected on the upper surface of the substrate 3. A discharge port 4B is opened in the vertical wall 4A, and an upper portion of the vertical wall 4A is a lid. It is covered with the body 4C. A portion surrounded by the vertical wall 4A and the lid 4C on the substrate 3 serves as a cake discharge chamber 4 in which the object to be processed (filter cake) that is communicated with the discharge hole 3A is discharged.

On the bottom surface of the cake discharge chamber 4, an annular plate-like turntable 4D centering on the axis O is disposed from the outer periphery of the discharge hole 3A on the substrate 3 to the inside of the vertical wall 4A. It is rotatably supported around O. The lower surface portion of the turntable 4D has a smaller diameter than the upper surface portion, and a gear is formed on the outer peripheral surface of the lower surface portion so as to circulate around the axis O, and a drive gear meshing with the gear is provided. The turntable 4D can be rotated around the axis O by table rotation means 4E such as a motor and a speed reducer provided.

Further, a scraping plate (not shown) extends from the edge of the discharge port 4B of the vertical wall 4A on the turntable 4D rotation direction side toward the turntable 4D. Accordingly, the filtered cake discharged from the discharge hole 3A onto the turntable 4D of the cake discharge chamber 4 is conveyed toward the discharge port 4B as the turntable 4D rotates, and is scraped off while being scraped off by the scraping plate. It moves along the plate and is discharged from the discharge port 4B.

Around the discharge hole 3A on the substrate 3, an annular seal member 3B having an inner diameter equal to the discharge hole 3A and having an outer diameter slightly smaller than the inner diameter of the turntable 4D is attached. Yes. The upper ridge portion of the seal member 3B is chamfered at the intersecting ridge line portion between the inner peripheral portion and the upper surface portion of the seal member 3B on the outer peripheral side than the chamfered portion is the same as the upper surface portion of the turntable 4D. The height in the direction is almost equal.

Furthermore, a gear chamber 5 comprising a vertical wall 5A and a lid 5B is provided at the upper part of the lid 4C in the same manner as the cake discharge chamber 4, and the lid 5B of the gear chamber 5 and the cake discharge chamber 4 Circular holes about the axis O are formed in the lid 4C. The inner filter body 1 constituted by a plurality of inner filtration structures 1A is attached to the lid body 5B of the gear chamber 5 via the inner filtration support body 6, and is supported by being suspended from the upper end side in the axis O direction. It is fixed by.

Here, the inner filtration support 6 includes an inner cylindrical portion 6A whose outer peripheral surface forms a cylindrical surface centered on the axis O. In particular, in this embodiment, the entire outer peripheral surface of the inner filtration support 6 has such a cylindrical shape, and the outer diameter of the inner filtration support 6 (inner cylindrical portion 6A) is equal to the outer diameter of the inner filtration body 1. . The inner diameter of the circular hole formed in the lid 5B is slightly larger than the outer diameter of the inner filtration support 6, and the inner diameter of the circular hole formed in the lid 4C is the same as that of the circular hole of the lid 5B. It is larger than the inner diameter, but smaller than the inner diameter of the discharge hole 3A. Further, the inner peripheral portion of the inner filtration support 6 is also formed with flange portions at both ends in the direction of the axis O and, if necessary, at the center thereof, similarly to the inner filtration component 1A.

Further, in the same manner as the outer filter body 2, the inner filter body 1 also has a plurality of inner filter structures 1 </ b> A stacked on the same axis in the vertical direction, and a lower flange portion and a lower inner filter structure of the upper inner filter structure 1 </ b> A. It is configured by abutting the flange portion at the upper end of the body 1A. In addition, the lower end flange portion of the inner filtration support body 6 also projects into the upper end flange portion of the uppermost inner filtration component 1A among the plural inner filtration components 1A constituting the inner filtration member 1 in this way. By being combined, it is arranged coaxially with the inner filter body 1.

Further, the inner filtration body 1 and the inner filtration support body 6 arranged coaxially in this manner have an inner filtration support flange 7A abutted against the flange portion at the upper end of the inner filtration support body 6 from the upper end side, An inner filtration support ring 7B is abutted from the lower end side to the flange portion at the lower end of the inner filtration structure 1A at the lowermost end of the inner filtration body 1. The inner filtration support flange 7A has a cylindrical portion having an outer diameter equal to the outer diameter of the inner filter body 1 and the inner filtration support body 6 and substantially equal to the inner diameter of these flange portions, and an upper end of the outer peripheral surface of the cylindrical portion. And the outer diameter of the flange portion of the inner filtration support flange 7 </ b> A is larger than the inner diameter of the circular hole of the lid 5 </ b> B of the gear chamber 5.
The inner filtration support ring 7B is a ring having a square cross section having an outer diameter equal to that of the inner filtration body 1 and the inner filtration support body 6 and an inner diameter substantially equal to these flange portions.

The inner filtration support flange 7A and the inner filtration support ring 7B, and the inner filter body 1 and the inner filtration support body 6 sandwiched between them, extend from the inner filtration support flange 7A to the inner filtration support ring 7B. A suspension bolt 7C inserted through each flange portion of the inner filtration structure 1A and the inner filtration support 6 in parallel with the axis O is screwed into the inner filtration support ring 7B, and the inner filtration support flange 7A from the upper end side. It is integrated by being fastened by a screwed nut. In the present embodiment, a plurality of suspension bolts 7C are inserted at equal intervals in the circumferential direction.

Thus, the inner filter body 1 integrated coaxially with the inner filtration support flange 7A, the inner filtration support body 6 and the inner filtration support ring 7B has a circular hole from the lower inner filtration support ring 7B to the lid bodies 5B and 4C. And inserted through the discharge hole 3A coaxially with the axis O at the inner periphery of the outer filter body 2 with a space therebetween, and the flange portion of the inner filter support flange 7A abuts on the upper surface of the lid body 5B of the gear chamber 5 and is bolted. As described above, it is suspended and fixed from the upper end side in the axis O direction. The height in the direction of the axis O of the upper and lower ends of the inner filter body 1 suspended and supported in this way is substantially the same as the height of the upper and lower ends of the outer filter body 2 that is also suspended and supported. The inner peripheral upper end of the support flange 7A is covered with a lid 7D.

The lower ends of the inner filter body 1 and the outer filter body 2 are coaxially connected by an annular member 8. The annular member 8 has an annular plate portion 8A having an inner diameter equal to the inner diameter of the inner filtration support ring 7B and an outer diameter substantially equal to the inner diameter of the outer filter body 2, and the outer peripheral edge of the annular plate portion 8A in the axis O direction. It is comprised integrally from the cylindrical part 8B extended upwards. The inner peripheral portion of the upper surface of the annular plate portion 8A and the upper end portion of the cylindrical portion 8B are bolted to the lower end surface of the inner filtration support ring 7B and the lower end flange portion of the outer filtration component 2A at the lowermost end of the outer filter body 2, respectively. By joining together, the lower ends of the inner filter body 1 and the outer filter body 2 are coaxially and liquid-tightly connected.

Furthermore, a workpiece supply pipe 9 for supplying a workpiece to be filtered into the filtration space S is connected to the annular plate portion 8A of the annular member 8. The workpiece supply pipe 9 is disposed so as to open to the annular plate portion 8A, extend downward in parallel to the axis O, and then extend to the outer periphery along a plane perpendicular to the axis O. In the present embodiment, the object to be processed is pumped from the lower side of the filtration space S through the object supply pipe 9 and supplied to the filtration space S. A plurality of workpiece supply pipes 9 may be connected to the annular plate portion 8A, for example, at equal intervals in the circumferential direction. In this embodiment, the two workpiece supply pipes 9 have the axis O therebetween. Are connected to opposite sides.

Further, the outer and lower spaces of the outer filter body 2 suspended from the substrate 3 are provided on the lower surface of the substrate 3 so as to surround the outer filter body 2 with a space from the outer filter body 2. It is covered with a bottom rectangular casing 10. The workpiece supply pipe 9 extends downward in the casing 10 and then extends to the outer peripheral side, and its end is connected so as to open to the outside of the wall surface of the casing 10. The object to be processed is fed and supplied from this end as described above.

The inner peripheral space of the inner filter body 1 is opened downward in the casing 10 via the inner filter support ring 7B and the inner peripheral portion of the annular member 8. Further, the bottom surface of the casing 10 is inclined downward toward one corner portion of the rectangular cylinder, and a filtrate discharge hole 10A is provided at one lower end portion of the wall surface intersecting with the corner portion. When a plurality of workpiece supply pipes 9 are connected to the annular member 8 as described above, the workpiece supply pipes 9 extend downward in parallel to the axis O, and are perpendicular to the axis O, for example. It may be integrated into one piece on one plane and opened in the wall surface of the casing 10.

On the other hand, a ribbon screw 11 twisted around the axis O is accommodated in the filtration space S so as to be rotatable around the axis O. As shown in FIG. 1, the ribbon screw 11 has a plate-like material whose cross section along the axis O extends perpendicularly to the axis O and spirals toward the rear side in the rotation direction toward the upper end side in the axis O direction. It is formed so as to be twisted. In this embodiment, as shown in FIG. 3, a plurality of (two) ribbon screws 11 are accommodated in the filtration space S, and these ribbon screws 11 have the same shape, the same size, and the same lead, and are circumferentially equivalent. It is arranged so as to be rotatable integrally with a gap.

Further, in the ribbon screw 11 twisted about the axis O in this way, portions facing in the direction of the axis O are connected by the connecting member 11A. Therefore, in the present embodiment in which the two ribbon screws 11 are arranged at equal intervals in the circumferential direction, a plurality of portions of these ribbon screws 11 facing each other in the axis O direction are spaced at equal intervals in the circumferential direction. It is connected by the connecting member 11A at places (for example, four places).

The connecting member 11A is a plate-like member extending parallel to the axis O, and the thickness direction of the ribbon screw 11 in the radial direction is set to a radial direction with respect to the axis O as shown in FIG. Are joined to the ribbon screw 11 so as to connect the central portions of the two. However, the connecting member 11 </ b> A thus connects the central portion of the width in the upper portion of the ribbon screw 11 in the axis O direction. On the other hand, as shown in FIG. 3, the inner peripheral edge and the outer peripheral edge of the ribbon screw 11 may be connected to each other at the lower part of the ribbon screw 11 in the axis O direction. The inner and outer peripheral edges may be connected.

Furthermore, the lower end edges of the ribbon screw 11 and the connecting member 11A are joined to an annular plate portion 11B perpendicular to the axis O. The inner diameters of the annular plate portion 11B and the ribbon screw 11 are slidable on the outer peripheral surface of the inner filter body 1, and the outer diameters are slidable on the inner peripheral surface of the outer filter body 2, respectively. However, a plurality of through-holes 11C are formed in the annular plate portion 11B at intervals in the circumferential direction so as to be spaced from the inner and outer peripheral edges and to avoid a joint portion between the ribbon screw 11 and the connecting member 11A. Yes. Therefore, the object to be processed supplied from the object to be processed supply pipe 9 can be supplied to the filtration space S through these through-holes 11C and run on the ribbon screw 11.

A screw support 12 is attached to the upper ends of these ribbon screws 11, and the ribbon screw 11 is also connected to the upper ends in the direction of the axis O through the screw support 12 in the same manner as the inner and outer filter bodies 1 and 2. It is suspended from the side and supported so as to be rotatable around the axis O. This screw support 12 has a cylindrical outer cylinder centered on an axis O that is slidably fitted to the outer periphery of the inner cylindrical portion 6A of the inner filtration support 6 with an inner diameter equal to the inner diameter of the ribbon screw 11. 12A is provided. The outer circumference of the outer cylindrical portion 12A is a certain length in the circumferential direction on the inner circumference of the upper end of the ribbon screw 11 (for example, one ribbon screw 11 (the length of the entire circumference in the circumferential direction / the length of the ribbon screw 11). By joining along the twist of the ribbon screw 11 with a length of several), the screw support 12 is attached to the ribbon screw 11 so as to be rotatable together.

A pressing ring 3C is provided between the outer peripheral surface of the screw support 12 and the seal member 3B attached to the upper surface of the discharge hole 3A of the substrate 3. The compression ring 3C includes an inner peripheral surface that forms a cylindrical surface centering on an axis O having an inner diameter that can rotate by sliding contact with an outer peripheral surface of the screw support 12, an upper surface that forms a flat surface perpendicular to the axis O, An outer peripheral surface having a frustoconical surface centering on an axis O inclined upward toward the outer peripheral side, and the inclination of the outer peripheral surface is equal to the inclination of the chamfered portion of the seal member 3B. The outer diameter is substantially equal to the outer diameter of the chamfered portion. Such a compression ring 3C is connected to a cylinder device (not shown) through an arm (not shown), supported so as to move up and down in the direction of the axis O without rotating, and a filter cake discharged from the discharge hole 3A. The water content is adjusted by squeezing.

Furthermore, a flange portion 12B is provided on the outer periphery of the upper end portion of the outer cylindrical portion 12A of the screw support 12, and the flange portion 12B has a gear support ring 12C having an annular cross section and an annular flat plate as shown in FIG. A pinion gear 12E is attached via a gear support plate 12D. The gear support ring 12C and the gear support plate 12D have the same inner diameter as the outer cylindrical portion 12A, the gear support ring 12C is fixed on the flange portion 12B, and the gear support plate 12D is coaxially stacked thereon and fixed. . Further, the outer diameter of the gear support ring 12C is slightly larger than that of the flange portion 12B, and is sized so as to be slidably contacted with the circular hole of the lid body 4C of the cake discharge chamber 4, and on the inner peripheral surface of the circular hole. A seal member (not shown) is interposed between the outer peripheral surface of the gear support ring 12C.

Furthermore, the pinion gear 12E has an annular shape having an inner diameter that is larger than the outer diameter of the gear support ring 12C, smaller than the outer diameter of the gear support plate 12D, and larger than the outer diameter of the gear support plate 12D. The gear support ring 12C and the gear support plate 12D are coaxially attached to the lower surface of the outer peripheral portion of the gear support plate 12D, and a gear is formed on the outer peripheral surface thereof. Therefore, an annular gap having a square cross section is formed between the outer periphery of the gear support ring 12C on the lower surface of the gear support plate 12D and the inner periphery of the pinion gear 12E.

On the other hand, when the gear support ring 12C is inserted into the circular hole of the lid 4C on the upper surface of the lid 4C in the gear chamber 5 as described above, the gap is formed on the lower surface of the gear support plate 12D. An annular bearing 5C is arranged so as to be accommodated. The bearing 5C has an inner diameter larger than the outer diameter of the gear support ring 12C, and the outer diameter is large enough to fit the inner peripheral surface of the pinion gear 12E. A bearing such as a ball bearing is provided on the outer peripheral surface of the bearing 5C. It is disposed so as to be interposed between the inner peripheral surface of the gear 12E, and supports the pinion gear 12E so as to be rotatable around the axis O. In this state, a slight gap is formed between the lower surface of the pinion gear 12E and the upper surface of the lid 4C and between the upper surface of the bearing 5C and the lower surface of the gear support plate 12D.

Accordingly, the ribbon screw 11 is supported by the bearing 5C in this way, and the ribbon screw 11 is interposed between the outer cylindrical portion 12A, the flange portion 12B, the gear support ring 12C, the gear support plate 12D, and the pinion gear 12E via the screw support body 12 described above. In this way, it is suspended from the upper end side in the direction of the axis O and is supported rotatably around the axis O. Further, a drive gear 5D that meshes with the pinion gear 12E is disposed in the gear chamber 5, and a screw rotating means 5E that includes a motor, a speed reducer, and the like is provided on the lid 5B of the gear chamber 5 to drive the gear. It is connected to 5D. By rotating the drive gear 5D by the screw rotating means 5E, the ribbon screw 11 is rotated around the axis O via the screw support 12.

Further, an inner peripheral cleaning tube 13 for cleaning the inner filter body 1 is inserted in the inner periphery of the inner filter body 1 so as to extend in the direction of the axis O, and the outer filter body 2 is cleaned on the outer periphery of the outer filter body 2. The outer peripheral cleaning pipe 14 is arranged so as to extend in the direction of the axis O. The inner peripheral cleaning tube 13 and the outer peripheral cleaning tube 14 are connected at the lower end side in the direction of the axis O of the inner and outer filter bodies 1 and 2 and can rotate integrally around the axis O.

In the present embodiment, one inner peripheral cleaning pipe 13 is inserted from the bottom surface of the casing 10 along the axis O, and the inner peripheral cleaning pipe 13 is rotated about the axis O by the bearing 13A at the insertion portion to the casing 10 bottom surface. Freely and liquid-tightly supported. Further, outside the casing 10 below the bearing 13A, a pinion gear 13B is attached to the inner peripheral cleaning pipe 13, and a cleaning pipe rotating composed of a motor, a speed reducer and the like having a drive gear meshing with the pinion gear 13B. By means 13C, the inner peripheral cleaning tube 13 can reciprocate within a predetermined rotation range.

Further, below the pinion gear 13B, a cleaning liquid supply pipe is connected to the lower end of the inner peripheral cleaning pipe 13 via a swivel joint (not shown). The cleaning liquid can be supplied to the inner peripheral cleaning pipe 13. Further, the upper end of the inner peripheral cleaning tube 13 is rotatably supported around the axis O at the center of the lower surface of the lid 7D that covers the inner peripheral upper end of the inner filtration support flange 7A.

The inner peripheral cleaning pipe 13 is provided with a nozzle 13D that diffuses and jets the cleaning liquid supplied from the cleaning liquid supply pipe as described above toward the filtration surface of the inner periphery of the inner filter body 1. In the present embodiment, the plurality of nozzles 13 </ b> D are ejected in one radial direction with respect to the axis O and another radial direction opposite to the axial line O at equal intervals in the direction of the axis O. The cleaning liquid can be supplied over the entire filtration surface of the inner periphery of the inner filter body 1 by rotation of the inner periphery cleaning pipe 13. Of these, the inner peripheral cleaning pipe 13 is divided and liquid-tightly connected so that the cleaning liquid is not supplied above the upper end flange portion of the uppermost inner filtration structure 1A in the direction of the axis O. It may be configured.

On the other hand, the outer peripheral cleaning pipe 14 is connected to the inner peripheral cleaning pipe 13 in the casing 10 on the lower end side in the direction of the axis O of the inner filter body 1 and the outer filter body 2 and can rotate integrally with the inner peripheral cleaning pipe 13. The outer peripheral cleaning pipe 14 extends in the radial direction with respect to the axis O from the connecting portion with the inner peripheral cleaning pipe 13 and then bends at a right angle on the outer peripheral side of the outer filter body 2 in the radial direction so as to be parallel to the axis O and upward. It has an extending L shape. The upper end of the outer peripheral cleaning tube 14 is located below the lower surface of the substrate 3 and is liquid-tightly sealed.

The outer peripheral cleaning pipe 14 communicates with the inner peripheral cleaning pipe 13 at a connection portion with the inner peripheral cleaning pipe 13, and the cleaning liquid supplied from the cleaning liquid supply pipe branches from the inner peripheral cleaning pipe 13 to clean the outer periphery. It is also supplied to the tube 14. A plurality of nozzles 14A for diffusing and ejecting the cleaning liquid toward the outer peripheral surface of the outer filter body 2 are also provided at equal intervals in the direction of the axis O (for example, the inner cleaning pipe 14). The same number as the nozzles 13D of the peripheral cleaning pipe 13).

Further, the outer peripheral cleaning pipe 14 is connected to the inner peripheral cleaning pipe 13 within a range in which the workpiece supply pipe 9 extends downward from the annular member 8 in the axis O direction. In the present embodiment in which a plurality (two) of workpiece supply pipes 9 are connected at equal intervals in the circumferential direction as described above, the outer peripheral cleaning pipes 14 are also equally spaced in the circumferential direction as shown in FIG. A plurality (two of the same number as the workpiece supply pipes 9) are connected to the inner peripheral cleaning pipe 13. By rotating these outer peripheral cleaning pipes 14 integrally with the inner peripheral cleaning pipe 13 within a rotation range that does not interfere with the workpiece supply pipe 9, the cleaning liquid can be supplied over the entire outer peripheral surface of the outer filter body 2. is there.

In such a vertical screw press type filtration device, for example, an object to be processed such as sludge is pumped through the object supply pipe 9 as described above and formed in the annular plate portion 11B at the lower end of the ribbon screw 11. It is supplied to the filtration space S from below through the hole 11C and conveyed upward as the ribbon screw 11 rotates, and the liquid (filtrate) is removed and filtered through the filter medium of the inner and outer filter bodies 1,2. . The removed filtrate travels along the inner periphery of the inner filter body 1 and the outer periphery of the outer filter body 2 and drops onto the bottom surface of the casing 10 and is discharged from the filtrate discharge hole 10A. Further, the filtered cake conveyed upward in the filtration space S is discharged from the discharge hole 3A onto the turntable 4D of the cake discharge chamber 4 while being adjusted in moisture content by the squeezing ring 3C, and is pushed out to the outer peripheral side. With the rotation of 4D, it moves along the scraping plate while being scraped off by the scraping plate as described above, and is discharged from the discharge port 4B.

In the vertical screw press type filtration device having the above-described configuration, the inner filter body 1 has an upper end in the direction of the axis O through an inner filter support 6 having an inner cylindrical portion 6A whose outer peripheral surface forms a cylindrical surface centered on the axis O. It is supported by being suspended from the side. The ribbon screw 11 is also supported by being suspended from the upper end side in the direction of the axis O through a screw support 12 having an outer cylindrical portion 12A having an inner peripheral surface forming a cylindrical surface centered on the axis O. Therefore, it is not necessary to provide a complicated support structure or a seal structure for supporting these below the inner filter body 1 and the ribbon screw 11, and the height of the filtration space S in which the ribbon screw 11 is accommodated and the height of the entire apparatus are eliminated. Can be kept low.

For example, in the present embodiment, the inner peripheral cleaning tube 13 is inserted from below the casing 10 as described above. However, if it is not considered to provide such a washing pipe as in the vertical screw press type filtration device described in Patent Document 1, the space of the workpiece supply pipe 9 and the filtrate are below the filtration space S. It is only necessary to secure a space for discharge, and it is not necessary to support the weight of the inner and outer filter bodies and the weight of the object to be processed acting on them with the machine base. For this reason, while being able to make low the height to the upper end of the filtration space S where filter cake is discharged | emitted, the height of filtration apparatus itself can also be restrained low in connection with this. In particular, in the present embodiment, since the outer filter body 2 is also supported by being suspended from the upper end side in the axis O direction, the height of the filtration space S and the entire apparatus can be further reliably reduced.

Therefore, when assembling the inner and outer filter bodies 1 and 2 and when the ribbon screw 11 is accommodated in the filtration space S between them, the assembly and maintenance of the filtration device can be avoided from being performed at a high place. It becomes possible to improve workability. Further, for example, even when the filter cake discharged from the discharge port 4B from the filtration space S through the cake discharge chamber 4 is conveyed and collected by a conveyor or the like, the height of the upper end of the filtration space S can be kept low. Accordingly, the conveyor and the like can also be disposed at a low position. Therefore, it is possible to reduce the installation cost when providing such a conveyor, and to deal with a case where there is a height restriction on the building in which the filtration device is disposed.

Furthermore, the outer cylindrical portion 12A of the screw support 12 that supports the ribbon screw 11 is slidably fitted to the outer periphery of the inner cylindrical portion 6A of the inner filtration support 6 that supports the inner filter 1. . By fitting the inner and outer cylindrical portions 6A and 12A, it becomes easy to adjust the positions of the inner filter body 1 and the ribbon screw 11, and the concentricity and assembly accuracy of the inner filter body 1 and the ribbon screw 11 are improved. Can do. In particular, in this embodiment, while the main body of the inner filtration support 6 is the inner cylindrical portion 6A, the screw support 12 is also an outer cylindrical portion 12A in which the main body is fitted to the inner cylindrical portion 6A from the outside. Since the gear support ring 12C and the gear support plate 12D from the flange portion 12B of the body 12 have the same inner diameter as the outer cylindrical portion 12A, it is possible to ensure higher coaxiality. Moreover, the support rigidity in the upper part of the ribbon screw 11 can be sufficiently ensured by fitting the inner and outer cylindrical portions 6A and 12A in this way. Therefore, stable filtration can be promoted by the ribbon screw 11 rotating smoothly and freely.

Furthermore, in the present embodiment, the ribbon screw 11 is connected to the screw rotating means 5E via the gear support ring 12C, the gear support plate 12D, and the pinion gear 12E connected to the screw support 12, and the upper end side. Is rotated around the axis O. For this reason, it is not necessary to provide a rotation means under the ribbon screw 11 accommodated in the filtration space S, and the height of the filtration space S can be further reliably suppressed. Moreover, since the outer cylindrical portion 12A of the screw support 12 is rotated while sliding on the outer periphery of the inner cylindrical portion 6A of the inner filtration support 6, the support rigidity is ensured and the rotational torque generated by the screw rotating means 5E. High strength can be obtained. Further, the screw support 12 can efficiently transmit the rotational force to the ribbon screw 11 and can rotate the ribbon screw 11 while maintaining high coaxiality with the inner filter body 1. For this reason, it becomes possible to filter with the inner filter body 1 reliably conveying a to-be-processed object with the ribbon screw 11.

Also, the inner periphery of the upper end of the ribbon screw 11 is joined to and supported by the lower end of the outer cylindrical portion 12A of the screw support 12 at a certain length in the circumferential direction along the twist. Further, a pinion gear 12E rotated by the screw rotating means 5E is connected to the screw support 12 via a gear support ring 12C and a gear support plate 12D, and the rotational force is also joined in this way via the screw support 12. Is transmitted to the ribbon screw 11. Therefore, an excessive twisting force is hardly applied to the ribbon screw 11. In addition, since the gear support ring 12C, the gear support plate 12D, and the pinion gear 12E are connected to the upper end portion of the screw support 12, they are sufficient for the cake discharge chamber 4 formed around the screw support 12. Space can be secured and smooth discharge of the filter cake can be achieved.

Furthermore, the outer peripheral surface of the inner filter body 1 supported by the inner filter support body 6 forms a cylindrical surface centered on the axis O having the same outer diameter as the outer peripheral surface of the inner cylindrical portion 6A of the inner filter support body 6. Yes.
Therefore, for example, when performing maintenance of the inner filter body 1, the inner filter support ring 7 </ b> B abutted against the flange portion of the lowermost inner filter structure 1 </ b> A and the annular plate portion 8 </ b> A of the annular member 8 are bolted. The inner filtration support body 6 together with the inner filtration support body 6 by unfastening and joining the flange portion of the inner filtration support flange 7A attached to the upper end of the inner filtration support body 6 and the lid body 5B of the gear chamber 5 by bolting or the like. The inner filter body 1 can be pulled out from the inner periphery of the ribbon screw 11 and the screw support 12. Therefore, maintenance can be easily performed.

In the present embodiment, a plurality of ribbon screws 11 are accommodated in the filtration space S so as to be integrally rotatable with an interval around the axis O, and the rotational torque acting when the workpiece is conveyed is provided. It can disperse | distribute to these multiple ribbon ribbon screws 11. FIG. Therefore, deformation or the like can be prevented without increasing the thickness of the ribbon screw 11. Moreover, since the lead of each ribbon screw 11 can be narrowed without changing the pitch in the direction of the axis O, the filling rate of the object to be processed into the filtration space S can be increased.

Furthermore, by accommodating a plurality of ribbon screws 11 in the filtration space S in this way, the number of times the inner and outer peripheral edges of the ribbon screw 11 scrape the filtration surfaces of the inner and outer filter bodies 1 and 2 per rotation increases. It can prevent clogging and increase the filtration rate. Therefore, as a result, uniform filtration can be promoted, variation in the moisture content of the filter cake can be suppressed, and processing capacity can be improved. Furthermore, if the processing capacity is made equal, the filtration space S can be further reduced. In particular, these effects are effective when a plurality of ribbon screws 11 are arranged at equal intervals in the circumferential direction as in this embodiment.

Furthermore, in the present embodiment, since the portions of the ribbon screw 11 facing the direction of the axis O are connected by the connecting member 11A, it is possible to improve the attachment strength of the ribbon screw 11 and prevent deformation and the like more reliably. it can. In particular, when the ribbon screw 11 is suspended and supported as described above, a tensile stress is applied to the connecting member 11A. Therefore, even with a connecting member 11A that is thinner than a case in which a compressive stress is applied. The strength can be ensured, and the connection member 11A can also prevent the conveyance of the object to be processed.
In this embodiment, a plurality of ribbon screws 11 are connected by the connecting member 11A, but the same effect can be obtained even when a single ribbon screw is accommodated in the filtration space S.

In the present embodiment, the inner filter body 1 suspended and supported from the upper end side in the axis O direction and the lower end portion of the outer filter body 2 also suspended and supported by the annular member 8 are supported by the annular member 8. Coaxially connected. Therefore, even if it is suspended from the upper end side in the axis O direction, the position of the inner and outer filter bodies 1 and 2 can be adjusted so as to be coaxial with the axis O over the entire length in the axis O direction, and the assembly accuracy is improved. Can be achieved. Further, it is not necessary to support the lower ends of the inner and outer filter bodies 1 and 2 in order to ensure such coaxiality, and the height of the filtration space S and the entire apparatus can be more reliably suppressed. Further, even when the workpiece is supplied from below the filtration space S as in the present embodiment, the lower end of the filtration space S can be sealed by the annular member 8 to prevent the workpiece from leaking. A complicated seal structure for prevention is unnecessary.

In the vertical screw press type filtration device having the above-described configuration, the ribbon screw 11 is also supported by being suspended around the axis O through the screw support 12 so as to be rotatable. Therefore, even when the lower ends of the inner and outer filter bodies 1 and 2 are connected by the annular member 8, it is possible to avoid the ribbon screw 11 from interfering with the annular member 8. Further, when the ribbon screw 11 is rotated via the screw support 12 as in the present embodiment, it is possible to avoid the screw rotating means 5E from interfering with the annular member 8, and a complicated sealing structure. Etc. become unnecessary.

On the other hand, in the present embodiment, the inner filter body 1 is fixed by being suspended and supported by a suspension bolt 7C inserted into the inner periphery of the inner filter body 1 from the upper end side in the axis O direction. For this reason, the inner filter body 1 can be securely and easily arranged coaxially with the axis O by properly setting the position of the upper end fastening portion of the suspension bolt 7C with the axis O, and the assembly accuracy can be further improved. Can be planned. Moreover, even when performing maintenance of the inner filter body 1 as described above, the inner filter body 1 can be lifted and pulled out via the suspension bolt 7C, so that the maintainability is further improved.

Further, an inner filtration support 6 having an outer diameter equal to that of the inner filtration body 1 disposed at the upper end of the inner filtration body 1 is also supported by being suspended integrally with the inner filtration body 1 by the suspension bolts 7C. For this reason, this inner filtration support body 6 can also be reliably coaxially arranged with respect to the axis O similarly to the inner filtration body 1. Accordingly, the assembly accuracy is improved and the suspension structure of the inner filter body 1 is simplified, and even when the screw support body 12 is fitted to the inner filter support body 6 from the outside as described above, the screw support body. 12 and the ribbon screw 11 can be accurately supported around the axis O so as to freely rotate.

Furthermore, the inner filter body 1 is constituted by a plurality of inner filter structures 1A divided in the direction of the axis O in this embodiment. Since these inner filtration structural bodies 1A are suspended and supported integrally by the suspension bolt 7C, it is possible to configure the inner filtration body 1 in which these inner filtration structural bodies 1A are supported coaxially with high accuracy. Become. Further, the inner filter body 1 and the inner filter support body 6 constituted by these inner filtration structural bodies 1A are provided with a single suspension inserted into the respective flange portions from the inner filtration support flange 7A at one place in the circumferential direction. The bolt 7C is integrated by being screwed into the inner filtration support ring 7B. Therefore, for example, as in the case where each flange portion is fastened with a bolt and a nut, minute shifts are sequentially stacked in the direction of the axis O, and a large shift in the radial direction with respect to the axis O does not occur.

In addition, by configuring the inner filter body 1 by a plurality of inner filter structures 1A divided in the direction of the axis O in this way, the length of the individual inner filter structures 1A in the direction of the axis O can be shortened. It is possible to easily manufacture the inner filtration structure 1A and the inner filtration body 1. Furthermore, even when a part of the inner filtration structure 1A is damaged, it is possible to replace only that part without replacing the entire inner filtration body 1.

Furthermore, it is also possible to combine the inner filtration components 1A having different functions, such as setting the pore size and the aperture ratio of at least some of the inner filtration components 1A to different values. For example, on the workpiece supply pipe 9 side, the filtrate is quickly removed by the inner filtration structure 1A having a large opening size and a large opening ratio. On the other hand, the filter cake can be squeezed by reducing the size and rate of opening on the discharge cake 3A side of the filter cake. These effects can also be obtained by the outer filter body 2 constituted by a plurality of outer filter structures 2A divided in the direction of the axis O in the same manner as the inner filter body 1.

On the other hand, in the present embodiment, an inner peripheral cleaning tube 13 for cleaning the inner filter body 1 is inserted into the inner periphery of the inner filter body 1 so as to extend in the direction of the axis O, and an outer filter is provided on the outer periphery of the outer filter body 2. Similarly, an outer peripheral cleaning pipe 14 for cleaning the body 2 is disposed so as to extend in the direction of the axis O. Accordingly, the inner peripheral cleaning tube 13 and the outer peripheral cleaning tube 14 are connected at the lower end side in the direction of the axis O of the inner and outer filter bodies 1 and 2 and can rotate integrally around the axis O.

For this reason, the filtration surfaces of the inner and outer filter bodies 1 and 2 suspended and fixed from the upper end side are washed evenly with a small amount of washing liquid by the rotating inner and outer peripheral washing tubes 13 and 14 to filter the inner and outer filter bodies 1 and 2. Surface clogging can be eliminated, and equipment such as a pump for supplying a cleaning liquid can be reduced. Furthermore, since the entire inner and outer filter bodies 1 and 2 can be cleaned by rotating the inner and outer peripheral cleaning pipes 13 and 14 by one cleaning pipe rotating means 13C, it is efficient.

Further, the inner peripheral cleaning tube 13 and the outer peripheral cleaning tube 14 are communicated with each other on the lower end side in the axis O direction of the inner filter body 1 and the outer filter body 2. Therefore, the cleaning liquid supplied to the inner peripheral cleaning pipe 13 is branched and supplied to the outer peripheral cleaning pipe 14, thereby cleaning the filtration surface of the outer filter body 2. For this reason, it is efficient because only one pump or the like for supplying the cleaning liquid is required, and the structure of the device such as a swivel joint can be simplified, and the maintenance is excellent.

In the present embodiment, the object to be processed is supplied from below the filtration space S by the object supply pipe 9 and filtered while being conveyed upward by the ribbon screw 11, and the filter cake is removed from the discharge hole 3 </ b> A at the upper end of the filtration space S. Discharge. However, conversely, the workpiece may be supplied from above the filtration space S and filtered while being conveyed downward by the ribbon screw 11, and the filtered cake thus filtered may be discharged from the lower end of the filtration space S. Moreover, instead of connecting the workpiece supply pipe 9 to the annular member 8 as in the present embodiment, it may be connected to, for example, the lower end of the outer filter body 2 and opened in the filtration space S. In this case, it is not necessary to form the through hole 11C in the annular plate portion 11B of the ribbon screw 11.

Furthermore, in this embodiment, the inner filter body 1 and the outer filter body 2 are formed in a cylindrical shape with a constant outer diameter centering on the axis O, and the ribbon screw 11 has a constant inner and outer diameter accordingly. However, for example, the cross-sectional area of the portion surrounded by the filtration surface of the inner and outer filter bodies 1 and 2 and the ribbon screw 11 in the cross section perpendicular to the axis O is reduced from the supply side of the workpiece to the discharge side of the filter cake. In addition, at least one of the inner and outer filter bodies 1 and 2 may be formed in a conical shape or a multistage cylindrical shape with the axis O as the center, and the inner and outer diameters of the ribbon screw 11 may be changed accordingly. Further, the lead of the ribbon screw 11 may be changed toward the axis O direction.

According to the vertical screw press type filtration device of the present invention, the height of the filtration space in which the ribbon screw is accommodated and the entire filtration device can be kept low, and the workability of assembly and maintenance of the inner filter body and the ribbon screw can be reduced. Can be improved. Further, even when the object to be processed after filtration is discharged from the upper end of the filtration space and conveyed and collected by a conveyor or the like, the conveyor can be installed relatively easily and at low cost. In addition, it is easy to adjust the position of the ribbon screw and the inner filter body, the concentricity and the assembly accuracy are improved, and the support rigidity of the ribbon screw can be sufficiently secured to promote stable filtration. Is possible.

DESCRIPTION OF SYMBOLS 1 Inner filter body 1A Inner filter structure 2 Outer filter body 2A Outer filter structure 3 Substrate 3A Discharge hole 4 Cake discharge chamber 5 Gear chamber 5E Screw rotation means 6 Inner filter support 6A Inner cylindrical portion 7C Hanging bolt 8 Annular member 9 Processing object supply pipe 10 Casing 11 Ribbon screw 11A Connecting member 12 Screw support 12A Outer cylindrical part 13 Inner peripheral cleaning pipe 13C Cleaning pipe rotating means 14 Outer peripheral cleaning pipe O Axis S of inner filter body 1 Filtration space

Claims (6)

1. An inner filter body fixed in a cylindrical or conical shape with an axis extending in the longitudinal direction as a center, and a cylindrical or conical shape coaxial with the inner filter body and spaced outside the inner filter body. An outer filter body that is fixed to the axis, and a ribbon screw that is accommodated between the inner filter body and the outer filter body in a spiral shape that twists around the axis, and is rotated about the axis.
   The inner filter body is supported by being suspended from the upper end side in the axial direction via an inner filter support body having an inner cylindrical portion whose outer peripheral surface forms a cylindrical surface centered on the axis. Fixed,
   The ribbon screw has a cylindrical surface centered on the axis and an outer cylindrical portion that is slidably fitted to the outer periphery of the inner cylindrical portion, through the screw support body, A vertical screw press type filtration device that is supported by being suspended from an upper end side in the axial direction so as to be rotatable about an axis.
2. The vertical screw press filtration device according to claim 1, wherein the ribbon screw is rotated via the screw support.
3. 3. The longitudinal direction according to claim 1, wherein an outer peripheral surface of the inner filter body has a cylindrical surface shape centering on the axis having an outer diameter equal to an outer peripheral surface of an inner cylindrical portion of the inner filter support. Screw press type filtration device.
4. A plurality of the ribbon screws are supported between the inner filter body and the outer filter body by being supported by the screw support body at intervals around the axis, and are accommodated rotatably together. The vertical screw press type filtration apparatus according to claim 3.
5. The vertical screw press filtration device according to any one of claims 1 to 4, wherein the ribbon screw has a portion facing the axial direction connected by a connecting member.
6. The vertical screw press filtration device according to any one of claims 1 to 5, wherein lower ends of the inner filter body and the outer filter body are coaxially connected by an annular member.

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