JP3925682B2 - Sludge dewatering machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sludge dewatering machine, and more particularly to a sludge dewatering machine capable of continuously dewatering sludge having a high water content without causing clogging of filter media.
[0002]
[Prior art]
Conventionally, sludge generated at a sewage treatment plant or the like has a high moisture content, and it has been difficult to dump this sludge as it is in a landfill or to incinerate it in terms of environment and cost.
For this reason, conventionally, sludge is dehydrated to a predetermined water content by being put on a dehydrator and disposed of.
As a dehydrator used for the dewatering of the sludge, for example, a punching metal is formed into a cylindrical shape to form a filter body, a screw or a piston is arranged in the filter body, the sludge is pushed in, and the pressure force removes it from the filter body. Some released water and performed dehydration.
[0003]
[Problems to be solved by the invention]
By the way, when dewatering sludge with a high water content, it is necessary to secure a sufficient filtration area of the filter body, so it is necessary to use a large filter body, which inevitably increases the size of the dehydrator. There was a problem.
In addition, the filter body made of punching metal is likely to be clogged by sludge entering the dewatering holes drilled in the filter body. If clogging occurs, the dewatering efficiency will be reduced, so the dewatering operation will be stopped frequently. Thus, the filter body must be cleaned, which causes a problem that the work capacity of the dehydration work is reduced.
[0004]
In view of the problems of the conventional sludge dewatering machine, the present invention can increase the filtration area of the filter body, reduce the size of the filter body and the dehydrator for installing the filter body, An object of the present invention is to provide a sludge dewatering machine that does not cause clogging and can improve the work capacity of the dewatering work.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the sludge dewatering machine of the present invention has two screen cylinders having different diameters formed by arranging ring screen materials at a predetermined interval, and is concentrically disposed. A ring filter medium having an outer diameter larger than that of the ring screen material is moved between the ring screen materials, and a ring filter medium having an inner diameter smaller than that of the ring screen material is moved in the radial direction between the ring screen materials of the outer screen cylinder. A ribbon screw that is rotationally driven by a motor is disposed between the inner screen cylinder and the outer screen cylinder.
[0006]
In this sludge dewatering machine, two screen cylinders having different diameters formed by arranging ring screen materials at predetermined intervals are concentrically arranged, and the ring screen material is disposed between the ring screen materials of the inner screen cylinder. A ring filter medium having an outer diameter larger than that of the material is inserted between the ring screen materials of the outer screen cylinder so that the ring filter medium having an inner diameter smaller than that of the ring screen material can be moved in the radial direction. Since a ribbon screw that is rotationally driven by a motor is disposed between the cylinder and the outer screen cylinder, sludge is filtered by both the inner screen cylinder and the outer screen cylinder. Allows a large filtration area and a ribbon screw inserted between the ring screen materials. By moving the grayed filter medium in the radial direction, it is possible to prevent the clogging.
[0007]
In this case, the ribbon screw can be arranged with the center and the axis of both screen cylinders being eccentric.
[0008]
Thereby, the ring filter medium inserted between the ring screen materials by the thin ribbon screw can be reliably moved in the radial direction.
[0009]
Moreover, the valve body provided with the drive means which adjusts the space | interval with a sludge discharge port can be arrange | positioned facing a sludge discharge port.
[0010]
Thereby, the magnitude | size of the pressing force concerning sludge can be adjusted easily.
[0011]
Moreover, the surface which opposes the sludge discharge port of a valve body can be formed in an inclined surface.
[0012]
Thereby, the dewatered sludge can be smoothly discharged from the sludge discharge port.
[0013]
Moreover, it can comprise so that the drive means of a valve body may be driven according to the load of the motor which drives a ribbon screw.
[0014]
Accordingly, it is possible to dewater the sludge by applying an appropriate pressing force according to the properties of the sludge, and it is possible to prevent the motor that drives the ribbon screw from being overloaded.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the sludge dehydrator of the present invention will be described with reference to the drawings.
[0016]
In FIG. 1, one Example of the sludge dehydrator of this invention is shown.
In this sludge dewatering machine, two screen cylinders 2 and 3 having different diameters formed by arranging ring screen materials 23 and 33 at predetermined intervals in a box-shaped main casing 1 are arranged concentrically. The ring filter medium 26 having an outer diameter larger than that of the ring screen material 23 is provided between the ring screen materials 33 of the outer screen cylinder 3 between the ring screen materials 23 of the inner screen cylinder 2. The ring filter media 36 having an inner diameter smaller than that of the ring screen material 33 are inserted so as to be movable in the radial direction, and are rotationally driven by the motor 7 between the inner screen cylinder 2 and the outer screen cylinder 3. A ribbon screw 4 is provided to constitute the main part.
[0017]
The inner screen cylinder 2 is supported by a fixed shaft 21 that penetrates and supports the inside of the main body casing 1 with a predetermined inclination angle, and water drainage holes are formed in both ends of the fixed shaft 21 and, if necessary, in the central portion. The members 22, 22, 22 are fixed, and a ring screen material 23 is disposed between the support members 22, 22, 22, a spacer 25 is disposed between the ring screen materials 23, and a tie rod 24 is supported to penetrate the ring screen material 23. Arranged to be configured.
The length in the axial direction of the spacer 25 that defines the interval between the ring screen members 23 is set so that the screen mesh of the screen cylinder 2 has a predetermined size.
Then, both ends of the tie rod 24 are fixed with nuts or the like via the support member 22 so that the inner screen cylinder 2 is fixed in the main body casing 1 with a predetermined inclination angle around the fixed shaft 21. To.
[0018]
The outer screen cylinder 3 is disposed on the outer periphery of the inner screen cylinder 2 with a gap in which the ribbon screw 4 can be inserted.
[0019]
Similar to the inner screen cylinder 2, the outer screen cylinder 3 is arranged at predetermined intervals by arranging the spacers 35 between the ring screen materials 33 and penetrating and supporting them by the tie rods 34. To configure.
The length in the axial direction of the spacer 35 that defines the interval between the ring screen members 33 is set so that the screen mesh of the screen cylinder 3 has a predetermined size.
Then, by fixing both ends of the tie rod 34 with nuts or the like via the support members 31 and 32, the outer screen cylinder 3 is concentrically with the inner screen cylinder 2 in the main body casing 1. Fix it with an inclination angle.
In this case, one support member 31 that fixes the outer screen cylinder 3 is fixed to the main body casing 1, and the other support member 32 is supported so as to be in sliding contact with a screw base 5 described later.
[0020]
The screw base 5 pivotally supports the boss portion 51 on the base end side (left end side in FIG. 1A) of the fixed shaft 21 via a sleeve 52, and the screw base 5 includes a spiral ribbon screw 4. To be fixed.
[0021]
The ribbon screw 4 fixed to the screw base 5 is rotatable between the inner screen cylinder 2 and the outer screen cylinder 3, and the outer peripheral surface of the inner screen cylinder 2 and the outer screen cylinder. 3 is inserted so that an unnecessary gap does not occur in the inner peripheral surface.
[0022]
The ribbon screw 4 can also have a uniform screw pitch over its entire length, but as shown in this embodiment, the base end side (left end side in FIG. 1A), that is, the sludge inlet. The screen cylinder 2 on the inner side from the sludge inlet 11 by increasing the screw pitch on the side 11 and reducing the screw pitch on the front end side (the right end side in FIG. 1A), that is, the sludge outlet 12 side. The sludge can be transferred toward the sludge discharge port 12 while gradually increasing the pressure applied to the sludge introduced between the outer screen cylinder 3 and the outer screen cylinder 3.
[0023]
Further, the gear 6 is fixed to the outer periphery of the boss portion 51 of the screw base 5, meshed with the pinion gear 8 of the motor 7 attached to the main body casing 1, and the motor 7 is driven to drive the pinion gear 8, the gear 6, and the screw. The ribbon screw 4 is rotated via the table 5.
[0024]
In this case, the ribbon screw 4 and the inner screen cylinder 2 are formed to have substantially the same length, and the outer screen cylinder 3 is formed slightly shorter than this, and the tip end side (the right end in FIG. 1A) is formed. The end surfaces of the ribbon screw 4, the inner screen cylinder 2, and the outer screen cylinder 3 are aligned at the same position at the position of the dewatered sludge discharge port 12 on the side).
[0025]
The sludge discharge port 12 is provided with a device 9 for adjusting the pressing force applied to the sludge.
The adjusting device 9 has a ring-shaped valve body 90 formed with an inclined surface facing the sludge discharge port 12 at the tip of an arm 91 slidably supported on the fixed shaft 21, and this arm A rod 92 is projected from the proximal end of 91, and the rod 92 is connected to a driving means 93 such as a hydraulic cylinder so that the interval between the valve body 90 and the sludge discharge port 12 can be adjusted.
[0026]
In this case, the driving means 93 of the valve body 90 of the adjusting device 9 can be driven in accordance with the load of the motor 7 that drives the ribbon screw 4, whereby an appropriate amount corresponding to the property of the sludge can be obtained. Sludge can be dehydrated by applying a pressing force, and an overload can be prevented from being applied to the motor 7 that drives the ribbon screw 4.
[0027]
Further, the main body casing 1 is provided with a sludge inlet 11 at the top, and a drain chute is formed by inclining the bottom plate at the bottom, and a drain outlet 13 for draining the desorbed water is provided at the lowest position of the drain chute, A sludge chute 14 for discharging dewatered sludge is provided at a position below the sludge discharge port 12 opposite to the drain port 13.
[0028]
A ring screen disposed between a ring filter medium 26 having a larger outer diameter than the ring screen member 23 disposed between the ring screen members 23 of the inner screen cylinder 2 and a ring screen member 33 of the outer screen cylinder 3. The ring filter medium 36 having an inner diameter smaller than that of the material 33 is for preventing clogging of the screen of the screen cylinders 2 and 3 in advance, and for always cleaning the screen eyes. It is comprised from the ring-shaped thin board | plate material inserted in the clearance gap used as the screen eyes of the screen cylinders 2 and 3 comprised by the ring screen materials 22 and 32. FIG.
[0029]
A ring filter medium 26 having an outer diameter larger than the ring screen material 23 of the inner screen cylinder 2 and a ring filter medium 36 having an inner diameter smaller than the ring screen material 33 of the outer screen cylinder 3 are shown in FIG. As shown in the figure, it protrudes from the inner screen cylinder 2 or the outer screen cylinder 3, and this protruding portion is inserted between the inner screen cylinder 2 and the outer screen cylinder 3. When the ribbon screw 4 abuts, it is moved in the radial direction, thereby preventing clogging.
[0030]
In this case, as shown in FIG. 2, the axis a of the ribbon screw 4 is eccentric with respect to the center b of the two screen cylinders 2, 3, preferably with respect to the center b of the two screen cylinders 2, 3. The ring filter media 26 and 36 inserted between the ring screen materials 23, 23, 33, and 33 are reliably moved in the radial direction by the thin ribbon screw 4 by being configured to be eccentric upward by a distance δ. Can do.
[0031]
Hereinafter, the operation of the sludge dehydrator will be described.
By driving the motor 7, while rotating the ribbon screw 4 inserted between the inner screen cylinder 2 and the outer screen cylinder 3, sludge is introduced from the sludge inlet 11, and the inner screen cylinder 2 and the outer screen cylinder 3.
[0032]
Thereby, since sludge is filtered by both the inner screen cylinder 2 and the outer screen cylinder 3, the filtration area can be increased.
[0033]
Further, the rotating ribbon screw 4 has a ring filter medium 26 having a larger outer diameter than the ring screen material 23 disposed between the ring screen materials 23 of the inner screen cylinder 2 and the ring screen material of the outer screen cylinder 3. The ring filter media 26 having a smaller inner diameter than the ring screen material 33 disposed between the ring screen media 33 are brought into contact with the portions projecting from the inner screen cylinder 2 or the outer screen cylinder 3, respectively. 36 can be sequentially moved in the radial direction, thereby preventing clogging.
[0034]
Moreover, the magnitude | size of the pressing force concerning sludge is easily adjusted by arrange | positioning the valve body 90 provided with the drive means 93 which adjusts the space | interval with the sludge discharge port 12 facing the sludge discharge port 12. In addition to this, by configuring the driving means 93 of the valve body 90 to be driven according to the load of the motor 7 that drives the ribbon screw 4, an appropriate pressing force according to the properties of the sludge can be obtained. Sludge can be dehydrated and overloading of the motor 7 that drives the ribbon screw 4 can be prevented.
[0035]
The dewatered sludge is discharged from the sludge discharge port 12 via the discharge mud chute 14. On the other hand, the inner screen cylinder 2 and the outer screen cylinder 3 are connected to the inner screen cylinder 2 and the outer screen cylinder 3. The desorbed water filtered from between the screen cylinders 3 to the inside of the inner screen cylinder 2 and the outside of the outer screen cylinder 3 is drained through the drain port 13.
[0036]
【The invention's effect】
According to the sludge dewatering machine of the present invention, two screen cylinders having different diameters formed by arranging ring screen materials at predetermined intervals are arranged concentrically, and between the ring screen materials of the inner screen cylinder. The ring filter medium having a larger outer diameter than the ring screen material is inserted between the ring screen materials of the outer screen cylinder so that the ring filter medium having an inner diameter smaller than the ring screen material can be moved in the radial direction. Since a ribbon screw that is rotationally driven by a motor is disposed between the inner screen cylinder and the outer screen cylinder, sludge is filtered between the inner screen cylinder and the outer screen cylinder. By performing both, the filtration area can be increased, the dehydrator can be downsized, and the ribbon screw Therefore, by moving the ring filter media inserted between the ring screen materials in the radial direction, clogging can be prevented, and efficient dewatering can be performed continuously. Can be improved.
[0037]
Also, by arranging the ribbon screw so that the center and the axis of both screen cylinders are eccentric, the ring filter medium inserted between the ring screen materials can be reliably moved in the radial direction by the thin ribbon screw. it can.
[0038]
Moreover, the magnitude | size of the pressing force concerning sludge can be easily adjusted by arrange | positioning the valve body provided with the drive means which adjusts the space | interval with a sludge discharge port facing a sludge discharge port.
[0039]
Moreover, the sludge dehydrated from the sludge discharge port can be smoothly discharged by forming the surface facing the sludge discharge port of the valve body as an inclined surface.
[0040]
In addition, the sludge can be dehydrated by applying an appropriate pressing force according to the sludge properties by driving the valve body driving means in accordance with the load of the motor that drives the ribbon screw. At the same time, it is possible to prevent the motor that drives the ribbon screw from being overloaded.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a sludge dehydrator according to the present invention, in which (A) is a front sectional view and (B) is a sectional view taken along line AA in (A).
FIG. 2 is a front cross-sectional view of a main part when an axis of a ribbon screw is eccentrically provided.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body casing 11 Sludge inlet 12 Sludge outlet 13 Drain outlet 2 Screen cylinder 21 Fixed shaft 23 Ring screen material 26 Ring filter medium 3 Screen cylinder 33 Ring screen material 36 Ring filter medium 4 Ribbon screw 5 Screw stand 9 Pressure adjusting device 90 Disc

Claims (5)

Two screen cylinders having different diameters formed by arranging ring screen materials at predetermined intervals are arranged concentrically, and an outer diameter larger than the ring screen material is provided between the ring screen materials of the inner screen cylinder. A ring filter medium having an inner diameter smaller than that of the ring screen material is fitted between the ring screen materials of the outer screen cylinder so as to be movable in the radial direction, and the inner screen cylinder and the outer screen A sludge dewatering machine in which a ribbon screw that is rotationally driven by a motor is disposed between cylinders. 2. The sludge dewatering machine according to claim 1, wherein the ribbon screw is disposed with the center and the axis of both screen cylinders being eccentric. The sludge dewatering machine according to claim 1 or 2, wherein a valve body provided with a driving means for adjusting a distance between the sludge discharge port and the sludge discharge port is disposed. 4. The sludge dewatering machine according to claim 3, wherein a surface facing the sludge discharge port of the valve body is formed as an inclined surface. 5. The sludge dewatering machine according to claim 3, wherein the driving means of the valve body is driven in accordance with a load of a motor for driving the ribbon screw.

Images