JP2005074384A - Screw press filtration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw press filtration apparatus provided with a discharge amount adjusting mechanism which causes no bridge phenomenon by performing the adjustment of discharge amount of dewatering cake and, further, the shearing of the dewatering cake. <P>SOLUTION: In the screw press filtration apparatus which filters a solid component in treated water by means of a screw 5 and separates filtrate and dewatered cake, a disk 18 provided with an opening 18a is rotatably disposed on a solid component discharging port 13 of the screw 5 and a motor 25 that rotatively drives the disk 18 and a motor 10 that rotates the screw 5 are independently disposed. By rotating the disk 18 with a drive different from the rotation of the screw 5, the discharge amount of the dewatering cake is adjusted and, also the moisture content can be adjusted. Further, by performing the shearing of the dewatered cake by rotation of the opening 18a, the dewatered cake can be divided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a screw press type filtration device that filters treated water containing sludge and other suspensions and separates it into a filtrate and a dehydrated cake, and more particularly to a discharge amount adjusting mechanism thereof.

As a device for performing solid-liquid separation in waste processing or the like, there is a screw press type filtration device capable of continuous processing.
In Japanese Patent No. 2791644 (Patent Document 1), a discharge amount adjusting portion having a truncated cone shape that is slidable with respect to a support shaft is provided at a discharge port of a screw press machine, and the discharge amount adjusting portion is pressed by a spring. Accordingly, a discharge amount adjusting mechanism that adjusts the discharge amount by the force of the spring is disclosed.

Japanese Patent Laid-Open No. 11-207111 (Patent Document 2: Japanese Patent No. 3018167) discloses a mechanism for adjusting the discharge amount by pressurizing an outlet adjustment valve with a hydraulic cylinder.
Further, Japanese Patent Application Laid-Open No. 11-216596 (Patent Document 3: Japanese Patent No. 2919826) discloses a mechanism that uses a scraping rotor and adjusts the discharge amount by an open / close valve.

Japanese Patent No. 2791644 JP-A-11-207111 JP-A-11-216596

  However, in these conventional discharge amount adjusting mechanisms, when there are many dehydrated cakes, for example, fibrous ones, they cannot be sheared when exiting the outlet adjustment valve, so they are entangled at the discharge port, causing a bridging phenomenon, and finally Trouble that the screw stops due to overload occurs.

  In the case of using a scraping rotor, since the opening / closing valve is installed at the subsequent stage of the scraping rotor, in the case of a dehydrated cake having a large amount of fiber, it is similarly entangled at the discharge port and a bridging phenomenon occurs.

  An object of this invention is to provide the screw press type | mold filtration apparatus provided with the discharge | emission amount adjustment mechanism which does not raise | generate a bridge | bridging phenomenon by performing shearing of a dewatering cake while adjusting the discharge | emission amount of a dewatering cake.

  A first configuration of the present invention is a screw press type filtration apparatus that filters solids in treated water with a screw and separates the filtrate into a dehydrated cake, and a disk provided with an opening at a solid content discharge port of the screw. A motor that is rotatably installed and rotationally drives the disk is provided independently of the motor that rotates the screw.

  In this first configuration, when the screw is driven at a constant rotation, the solid content in the treated water is compressed by the screw and pushed out from the solid content outlet. The solid content outlet is provided with a disk having an opening, and the amount of dehydrated cake discharged can be adjusted by the rotational speed of the disk. That is, when the disc rotation speed is slow, the discharge amount is small, and when it is fast, the discharge amount is large. Moreover, since the rotation direction of the opening of the disk is orthogonal to the solid content discharging direction by the screw, the dehydrated cake is sheared and divided.

According to a second configuration of the present invention, in the screw press type filtration device of the first configuration, an inclined piece extending obliquely from the disk is provided on the exit side of the opening of the disk.
In this 2nd structure, when the solid content extruded from the screw press is pressed against a disk, the inclined piece which covers most of opening becomes a baffle plate and is squeezed. The solid matter pressed against the inclined piece is cut at the end of the opening of the rotating disk and discharged from the gap between the opening and the inclined piece, so that the efficiency of solid-liquid separation is increased.

According to a third configuration of the present invention, a dehydrated cake discharge port casing for discharging the solid content pushed out from the opening of the disk is provided on the opposite side of the disk from the screw, and the interior of the dehydrated cake discharge port casing is provided. Further, a scraping blade that rotates integrally with the disk is provided.
In the third configuration, when the disk rotates, the scraping blades also rotate, and push the divided dehydrated cake in the discharge direction.

According to a fourth configuration of the present invention, the axial centers of the screws are arranged vertically.
In this 4th structure, a screw press type | mold filtration apparatus becomes a vertical type by making a screw perpendicular | vertical, and an installation space becomes small.

  According to the present invention, a disk having an opening is rotatably installed at the discharge part of the screw press, and the amount of dehydrated cake is adjusted by rotating the screw press separately from the rotation of the screw press. Adjustment is also possible. Further, the dehydrated cake can be divided by shearing the dehydrated cake by rotating the opening.

  Moreover, the effect of solid-liquid separation is improved by providing an inclined piece extending obliquely from the disk on the exit side of the opening of the disk.

  In addition, a dehydrated cake discharge port casing for discharging the solid content pushed out from the opening of the disk is provided on the opposite side of the disk from the screw, and the dehydrated cake discharge port casing is rotated integrally with the disk. By providing the scraping blades to be cut, it becomes easy to discharge the separated dehydrated cake.

  Furthermore, installation space can be made small by making a screw press type | mold filtration apparatus into a vertical type.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
1 is a longitudinal front view of a screw press type filtration apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG.

  First, in FIG. 1, the screw press type filtration apparatus fixes an inner tube 3 and an outer tube 4 between a pedestal 1 and an upper flange 2, and a screw 5 is installed inside the inner tube 3. The inner tube 3 is made of a porous and slit-shaped material such as a punching metal or a wedge wire screen, and discharges the liquid generated when compressed by the screw 5 to the cavity between the outer tube 4 and the inner tube 3. It is like that. The outer tube 4 can be seen through by being made of a transparent material such as acrylic, but may be opaque.

  A screw shaft 6 provided with a screw 5 is fixed to a screw drive shaft 7, and an upper end of the screw drive shaft 7 is supported by a thrust / radial bearing 9. Further, the lower end of the screw shaft 6 is freely supported in this embodiment, and a packing 8 is provided. The screw drive shaft 7 is rotationally driven by a screw drive motor 10.

  A lower part of the inner pipe 3 is provided with an introduction pipe 11 for introducing treated water containing solids, and a lower part of the cavity between the inner pipe 3 and the outer pipe 4 is provided with a filtrate discharge pipe 12 for discharging the filtrate. It has been. The end of the screw 5 at the top of the inner tube 3 is a solid content outlet 13. In addition, packings 15 for water sealing are provided above and below the outer tube 4, and a bolt 16 is used to tighten the space between the base 1 and the upper flange 2 to form a watertight structure.

  A dehydrated cake discharge port casing 17 (see FIG. 2) including a cylindrical portion 17a and a discharge cylinder 17b is fixed to the upper portion of the upper casing 2, and a disk 18 is provided inside the cylindrical portion 17a. The disk 18 has an opening 18 a and an inclined piece 18 b (see FIGS. 2 and 3), and is fixed to the drive board 20 by a scraping blade 19. The drive panel 20 is rotatably supported by a bearing 21 concentric with the screw drive shaft 7 and rotates integrally with the passive sprocket 22. The passive sprocket 22 is connected to a drive sprocket 24 by a chain 23, and the drive sprocket 24 is rotationally driven by a disk drive motor 25.

  In the embodiment of FIG. 1, the pitch of the screw 5 does not change along the longitudinal direction of the screw shaft 6, and the diameter of the screw shaft 6 increases from the lower end to the upper end. However, even if the diameter of the screw shaft 6 is made constant and the pitch of the screw 5 is shortened from the lower end to the upper end, the treated water can be compressed.

Next, the operation of this embodiment will be described.
The treated water whose solid content is pulverized by a pulverizer (not shown) is introduced from the introduction pipe 11 to the lower part of the inner pipe 3. While the introduced treated water rises by the screw 5 that is driven to rotate, the liquid is filtered into the inner side of the outer tube 4 from the pores or slits of the inner tube 3, and the solid content is between the screw 5 and the screw shaft 6. It rises while being compressed. The compressed solid content contacts the disk 18 at the solid content outlet 13 at the top of the screw 5. Since the latter is smaller in the area of the solid content discharge port 13 and the area of the opening 18 a provided in the disk 18, the solid content is further compressed by the disk 18.

  Here, when viewed from the screw press side, the inclined piece 18b is connected in an oblique direction so as to close the opening 18a. Since the solid content is extruded perpendicularly to the disk 18 from the screw press side, the dehydrated cake, which is a solid material hitting the inclined piece 18b, is sheared at the sharp corners of the opening 18a, and the dehydrated cake is discharged while being divided. It is discharged into the outlet casing 17. The discharged dehydrated cake is discharged from the discharge cylinder 17 b by the scraping blade 19 together with the dehydrated cake attached to the inner wall of the dehydrated cake discharge casing 17.

  INDUSTRIAL APPLICABILITY The present invention can be applied to the filtration of treated water containing sludge and other suspended matters as a screw press type filtration apparatus having a discharge amount adjusting mechanism that does not cause a bridge phenomenon.

It is a vertical front view of the screw press type | mold filtration apparatus which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is an expanded sectional view of a disk part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Upper flange 3 Inner pipe 4 Outer pipe 5 Screw 6 Screw shaft 7 Screw drive shaft 8 Packing 9 Thrust and radial bearing 10 Screw drive motor 11 Introducing pipe 12 Filtrate discharge pipe 13 Solid content discharge port 15 Packing 16 Bolt 17 Dehydrated cake Discharge port casing 17a Cylindrical portion 17b Discharge cylinder 18 Disk 18a Opening 18b Inclined piece 19 Scraping blade 20 Drive panel 21 Bearing 22 Passive sprocket 23 Chain 24 Drive sprocket 25 Disk drive motor

Claims (4)

In a screw press type filtration device that filters solids in treated water with a screw and separates it into a filtrate and a dehydrated cake,
A screw press, wherein a disk having an opening is rotatably installed at a solid content discharge port of the screw, and a motor for rotating the disk is provided independently of a motor for rotating the screw. Mold filtration device.   The screw press type filtration apparatus according to claim 1, wherein an inclined piece extending in an oblique direction from the disk is continuously provided on the exit side of the opening of the disk.   A dehydrated cake discharge port casing for discharging the solid content pushed out from the opening of the disk is provided on the opposite side of the disk from the screw, and rotates integrally with the disk inside the dehydrated cake discharge port casing. The screw press type filtration apparatus according to claim 1 or 2, further comprising a scraping blade.   The screw press type filtration apparatus according to any one of claims 1 to 3, wherein the axial center of the screw is arranged vertically.

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