CN115315302A - Sieve device, concentration system, dehydration system, and water treatment system - Google Patents
Sieve device, concentration system, dehydration system, and water treatment system Download PDFInfo
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- CN115315302A CN115315302A CN202180021597.6A CN202180021597A CN115315302A CN 115315302 A CN115315302 A CN 115315302A CN 202180021597 A CN202180021597 A CN 202180021597A CN 115315302 A CN115315302 A CN 115315302A
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- cylindrical body
- annular sliding
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- wire
- screen
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 64
- 230000018044 dehydration Effects 0.000 title claims description 31
- 238000006297 dehydration reaction Methods 0.000 title claims description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 68
- 239000010802 sludge Substances 0.000 claims description 58
- 239000007788 liquid Substances 0.000 claims description 48
- 239000000126 substance Substances 0.000 claims description 21
- 210000002700 urine Anatomy 0.000 claims description 13
- 210000003608 fece Anatomy 0.000 claims description 12
- 230000008719 thickening Effects 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 230000001112 coagulating effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 10
- 238000003756 stirring Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- -1 feces and urine Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
- 230000002550 fecal effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/12—Apparatus having only parallel elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/126—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using drum filters
Abstract
A screen device (1) having: a cylindrical body (2A) of a predetermined inner diameter formed of a plurality of wires (3A); four regulating parts for regulating the movement of one end and the other end of each wire (3A) to the radial outer side and the radial inner side of the cylinder body (2A) respectively; an annular sliding section (4A) disposed at one end of the cylinder (2A); and a control device for rotating the annular sliding part (4A) around the central axis (O). The inside of the annular sliding part (4A) is in a shape in which convex parts (43 a) and concave parts (44A) protruding toward the central axis (O) and recessed are alternately and regularly connected. The control device can enlarge the size of a sieve hole formed on one end side between two adjacent wire rods (3A) than the size of a sieve hole formed on the other end side between two adjacent wire rods (3A) by rotating the annular sliding part (4A) while maintaining the predetermined inner diameter of the other end of the cylindrical body (2A).
Description
Technical Field
The present invention relates to a screen apparatus (screen apparatus), a concentration system having the screen apparatus, a dehydration system having the screen apparatus, and a water treatment system having at least the dehydration system.
Background
In a sieve device used for various purposes such as solid-liquid separation and classification, sieve pores (gaps formed between adjacent wire rods) are formed to prevent passage of substances having a predetermined size or more contained in a treated object and to allow passage of substances having a size smaller than the predetermined size or to allow passage of a predetermined amount of the treated object. In such a screen device, not only a device in which the size of the screen hole is fixed but also a device in which the size of the screen hole is variable has been developed.
For example, patent document 1 discloses a device that: the screen device is provided with a fixed-side screen member and a movable-side screen member that can slide relative to the fixed-side screen member, and the size of the screen hole can be changed by sliding the movable-side screen member.
Further, patent document 2 discloses an apparatus that: by stretching the coil spring formed by spirally winding the wire rods, the interval between adjacent wire rods, that is, the size of the screen mesh can be increased.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. H10-235293
Patent document 2: japanese patent No. 6458962
Disclosure of Invention
Problems to be solved by the invention
However, in the screen devices disclosed in patent documents 1 and 2, although the sizes of the screen holes can be changed, the screen holes are set to be the same size at any position in the longitudinal direction of the screen device. Therefore, for example, when solid-liquid separation or classification is performed in multiple stages, depending on the application, a target treatment capacity cannot be obtained by only one sieve device. In such a case, a plurality of screen devices having different screen mesh sizes must be arranged, and the cost of the entire system may increase.
The present invention has been made in view of the above problems, and an object thereof is to provide a screen device in which the sizes of screen holes can be made different in the longitudinal direction of the screen device, and a concentration system, a dehydration system, and a water treatment system in which the screen device is used for treatment of sludge, excrement, urine, and the like.
Means for solving the problems
The screen device of the present invention has: a cylindrical body having a predetermined inner diameter, which is formed by arranging a plurality of linear wires parallel to each other in a cylindrical shape; a first regulating portion that regulates movement of one end of each of the wire rods to the outside in the radial direction of the cylindrical body; a second regulating portion that regulates the movement of the one end of each of the wire rods radially inward of the cylindrical body; a third regulating portion that regulates the other end of each wire rod to move radially outward of the cylindrical body; a fourth regulating portion that regulates the other end of each of the wires to move radially inward of the cylindrical body; an annular sliding portion disposed in the vicinity of the one end of the cylindrical body and concentric with a central axis of the cylindrical body; and a control device that rotates the annular sliding portion around the central axis. The shape of the radially inner side of the annular sliding portion is a shape in which a plurality of convex portions of the same shape protruding toward the central axis and a plurality of concave portions of the same shape recessed toward the central axis are alternately and regularly connected in the circumferential direction, and the number of the convex portions is the same as the number of the wire rods. The control device may be configured to rotate the annular sliding portion while the other end of the annular sliding portion is maintained at the predetermined inner diameter of the cylindrical body by the third restricting portion and the fourth restricting portion, so that a size of a mesh hole formed on the one end side between the two adjacent wire rods can be larger than a size of a mesh hole formed on the other end side between the two adjacent wire rods at the other end.
The concentration system of the present invention is characterized by comprising: a screen device according to the present invention, wherein a central axis of the cylindrical body is arranged substantially horizontally; a drive device for rotating the cylindrical body of the screen device about the central axis; an introduction pipe for supplying the liquid to be treated from the other end of the screen device into the cylindrical body; and a concentration measuring device for measuring the concentration of the concentrated sludge discharged from the one end of the screen device, wherein the control device of the screen device changes the size of the screen hole according to the concentration output by the concentration measuring device.
The dehydration system of the present invention is characterized by comprising: a screen device of the present invention, wherein a central axis of the cylindrical body is arranged substantially horizontally; an introduction pipe for supplying the object to be treated from the one end of the screen device into the cylindrical body; a screw shaft disposed inside the cylindrical body and on the central axis, for conveying the object to be treated from the one end to the other end; and a moisture content measuring device that measures a moisture content of the dewatered sludge discharged from the other end, wherein the control device of the sieve device changes the size of the sieve mesh in accordance with the moisture content output by the moisture content measuring device.
The water treatment system of the present invention is a water treatment system that uses sludge, feces and urine, or a mixture of sludge and feces and urine as a treatment target and concentrates and dehydrates the treatment target, the water treatment system including: a mixing tank for supplying at least one of a dehydration assistant, a metal removal chemical, and a flocculant to the processing object, and mixing and coagulating the supplied substances; a concentration system according to the present invention, which introduces the liquid stored in the mixing tank as the liquid to be treated into the mixing tank; and a dewatering system according to the present invention configured to introduce the concentrated sludge discharged from the concentration system into the dewatering system as the object to be treated.
Effects of the invention
According to the screen device of the present invention, since the sizes of the screen holes can be made different in the longitudinal direction of the screen device, multi-stage solid-liquid separation and classification can be performed by one screen device. This can avoid an increase in the cost of the entire system.
According to the thickening system and the dewatering system of the present invention, since the screen device of the present invention is applied, the sizes of the screen holes can be made different in the longitudinal direction of the screen device. This makes it possible to appropriately perform concentration and dehydration while conveying the liquid to be treated and the object to be treated, which are introduced into the cylindrical body, respectively.
According to the water treatment system of the present invention, the sizes of the screen holes can be made different in the longitudinal direction of the screen device in both the concentration system and the dehydration system. Further, the use of the screen device of the present invention in both the concentration system and the dewatering system is excellent from the viewpoint of system construction, and the cost of the entire system can be further reduced.
Drawings
Fig. 1 is a partially exploded perspective view showing a screen apparatus of a first embodiment.
Fig. 2 is a side view of the screen assembly shown in fig. 1 from one end side.
Fig. 3 is a diagram for explaining an operation of the screen device shown in fig. 1 (an enlarged view of a portion X in fig. 2).
Fig. 4 is a partially exploded perspective view showing a screen apparatus of a second embodiment.
Fig. 5 is a side view of the cylindrical body of the screen device shown in fig. 4, viewed from one end side.
Fig. 6 is a diagram for explaining an operation of the screen device shown in fig. 4 (an enlarged view of a portion Y of fig. 5).
Fig. 7 is a table showing combinations of the wire rods and the second wire rods that form the cylindrical body of the modification of the second embodiment.
Fig. 8 is a part of a side view of the screen device of pattern 1 of the third embodiment, viewed from one end side.
Fig. 9 is a part of a side view of the screen device of the pattern 2 of the third embodiment as viewed from one end side.
Fig. 10 is a diagram showing an example of a water treatment system according to an embodiment.
Fig. 11 is a diagram showing an example of a water treatment system according to another embodiment.
Fig. 12 is a diagram illustrating a concentration system according to an embodiment.
Fig. 13 is a diagram illustrating a dewatering system according to an embodiment.
Detailed Description
Hereinafter, a sieve device according to an embodiment will be described with reference to the drawings, and a water treatment system having the sieve device will be described. The embodiments and modifications described below are merely examples, and various modifications and technical applications that are not explicitly described in the embodiments and the like are not intended to be excluded. The respective configurations of the present embodiment can be implemented by being variously modified within a range not departing from the gist thereof. Further, they can be selected as necessary, or can be appropriately combined.
[ outline of Screen device ]
The screen device includes a screen hole for passing a substance having a size smaller than a predetermined size in sludge, feces and urine, or a mixture thereof (hereinafter, these are also collectively referred to as "liquid to be treated" or "object to be treated"), or passing a predetermined amount of object to be treated, and is used for solid-liquid separation, classification, or the like according to the purpose. The screen device has a cylindrical body with a predetermined inner diameter formed by arranging a plurality of linear wires parallel to each other in a cylindrical shape. The mesh is a gap formed between two adjacent wires. The screen device of the present invention is configured such that the size of the screen opening on one end side of the cylindrical body can be changed to be larger (can be enlarged) than the size of the screen opening on the other end side.
The screen device includes four restricting portions (a first restricting portion, a second restricting portion, a third restricting portion, and a fourth restricting portion) for restricting movement of one end and the other end of each wire rod to the radially outer side and the radially inner side, respectively. That is, the first regulating portion regulates the movement of one end of each wire rod to the outside in the radial direction of the cylindrical body, and the second regulating portion regulates the movement of one end of each wire rod to the inside in the radial direction of the cylindrical body. The third regulating portion regulates the other end of each wire rod to move radially outward of the cylindrical body, and the fourth regulating portion regulates the other end of each wire rod to move radially inward of the cylindrical body.
The screen device further includes: an annular sliding portion disposed in the vicinity of one end of the cylindrical body; and a control device for rotating the annular sliding part around the central shaft. The annular sliding portion is a member concentric with the cylindrical body (having the same central axis as that of the cylindrical body), and is supported to be rotatable in the circumferential direction with respect to the cylindrical body. The radially inner side of the annular sliding portion has a shape (for example, a shape along a trochoid) in which a plurality of convex portions of the same shape protruding toward the central axis and a plurality of concave portions of the same shape recessed toward the central axis are alternately and regularly connected in the circumferential direction. The number of the convex portions is the same as the total number of the wires, and the annular sliding portion functions as an internal gear.
The control device is an electronic control device (computer) that can be realized by applying a known hardware configuration. The control device can enlarge the size of the mesh formed on one end side between two adjacent wire rods to be larger than the size of the mesh formed on the other end side between two adjacent wire rods to be larger by rotating the annular sliding portion while the other end of the wire rods is kept at the predetermined inner diameter of the cylindrical body by the third and fourth restricting portions. That is, the first regulating portion and the second regulating portion located on the one end side of the cylindrical body regulate the movement of the one end of the wire rod in the radial direction, but the annular sliding portion located on the one end side is rotated, so that the mesh formed between the two adjacent wire rods is expanded on the one end side. On the other hand, since the movement of the other end of the wire rod is restricted by the third and fourth restricting portions, the sizes of the screen holes in the longitudinal direction of the screen device are different.
According to such a screen device, since the sizes of the screen holes can be made different in the longitudinal direction of the screen device, it is possible to perform multi-stage solid-liquid separation and classification with one screen device. This can avoid an increase in the cost of the entire system. The multi-stage described herein also includes a case where the stages are continuously changed.
In addition, when the shape of the radially inner side of the annular sliding portion is a shape along a trochoid, the size of the mesh formed between the adjacent wire rods can be smoothly changed along with the movement of the concave shape and the convex shape along the trochoid (along with the amount of change in operation of the gear).
Hereinafter, a specific structure of the screen device will be described with reference to three embodiments. Next, a water treatment system (including a concentration system and a dehydration system) using any one of the screen devices will be described.
For example, a wedge wire can be used as the wire (including the second wire) described below.
[1. First embodiment ]
[1-1. Structure ]
Fig. 1 to 3 are views for explaining a screen device 1A according to a first embodiment. As shown in fig. 1, the screen device 1A includes a cylindrical body 2A having a predetermined inner diameter formed by arranging a plurality of linear wires 3A parallel to each other in a cylindrical shape. The sectional shape of the wire 3A orthogonal to the longitudinal direction in the present embodiment is an isosceles triangle, and all the wires 3A have the same shape. The wire 3A is arranged in a cylindrical shape with a rectangular plane (screen surface) formed by the base of an isosceles triangle and a straight line extending in the longitudinal direction facing the central axis O of the cylinder 2A. The axial direction of the central axis O of the cylindrical body 2A and the longitudinal direction of the wire 3A coincide with each other. In the present embodiment, the size of the mesh is the size of the gap between two adjacent wire rods 3A, unlike the second embodiment described later.
Each wire 3A is locked so as to be movable in the radial direction, but the movement thereof is restricted by a restricting portion described below.
The screen device 1A includes four regulating portions (a first regulating portion, a second regulating portion, a third regulating portion, and a fourth regulating portion) for regulating movement of one end (left end in fig. 1) and the other end (right end in fig. 1) of each wire 3A to the radially outer side and the radially inner side, respectively. The screen device 1A includes an annular sliding portion 4A concentric with the cylindrical body 2A and a control device (for example, control devices 31 and 51 shown in fig. 10, and not shown in fig. 1).
The annular sliding portion 4A is provided integrally with the first regulating portion, and includes two annular sliding plates 41A, 42A of the same shape arranged on the outer periphery of the cylindrical body 2A. In other words, the annular sliding portion 4A is also the first regulating portion. That is, the two annular sliding plates 41A and 42A have a function of regulating the movement of one end of each wire 3A to the outside in the radial direction, and are controlled to rotate by the control device.
The radially inner side of each of the annular sliding plates 41A, 42A has a shape in which a plurality of convex portions 43a having the same shape and protruding toward the central axis O and a plurality of concave portions 44a having the same shape and recessed therein are alternately and regularly connected in the circumferential direction (for example, a shape along a trochoid line). The total number of the convex portions 43a is the same as the total number of the concave portions 44 a. The number of the convex portions 43A is the same as the number (total number) of the wire rods 3A, and the annular sliding portion 4A functions as an internal gear. As shown in fig. 2 and 3, the annular sliding plates 41A and 42A are shaped such that the concave portions 44a come into surface contact with the corner portions of the apex angles of the two adjacent wires 3A in a state where the convex portions 43A are interposed between the two wires 3A.
In the screen device 1A, the second regulating portion is an annular spring 5A that presses one end of the wire 3A radially outward of the cylindrical body 2A. In fig. 1, two ring springs 5A having the same shape are illustrated as the second regulating portion, but the number of the ring springs 5A is not limited to two, and may be, for example, one.
The annular spring 5A is fitted into, for example, a recess 2g formed in the screen surface at one end of the cylindrical body 2A (each wire 3A). In this case, the inner surface of the annular spring 5A is arranged not to protrude radially from the screen surface but to be substantially flush with the screen surface.
In the screen device 1A, a cover member 6A formed of a thin plate is fixed to one end of the cylindrical body 2A. The cover member 6A has a cylindrical wall coaxial with the central axis O and an annular flat plate portion (annular portion), and is fixed to, for example, a casing (not shown) covering the entire screen device 1A. The cover member 6A may be arranged such that the cylindrical wall covers the two annular slide plates 41A, 42A, and in this case, the two annular slide plates 41A, 42A can be restricted from being displaced in the radial direction. Note that the cover member 6A is not shown in fig. 2 and 3.
The third regulating portion provided at the other end of the cylinder body 2A is at least one of the annular plate 7A and the two annular sliding plates 91A, 92A disposed on the outer periphery of the cylinder body 2A. The annular plate 7A is an annular plate member that restricts the other end of the wire 3A from moving radially outward, and is fixed to the housing, for example. On the other hand, the annular sliding plates 91A and 92A are annular plate members configured similarly to the annular sliding plates 41A and 42A provided on one end side.
The fourth regulating portion is a ring spring 8A that presses the other end of the wire 3A radially outward of the cylindrical body 2A. In the screen device 1A shown in fig. 1, the annular plate 7A and the two annular sliding plates 91A and 92A are both provided, and one end side and the other end side are configured similarly. When the two annular slide plates 91A, 92A are provided as the third regulating portion, the wire 3A can be moved also on the other end side as described later, and therefore, the change in the mesh width of the wire 3A from one end to the other end increases.
The upper diagram of fig. 3 shows a state where the sizes of the mesh openings are the same on one end side and the other end side. In this state, the concave portions 44a of the two annular sliding plates 41A, 42A are circumferentially displaced from each other as viewed from the axial direction, and the wire 3A is pressed by the annular spring 5A while entering the most recessed portion of the concave portion 44a by a length Δ R inward in the radial direction. From this state, the control device rotates the two annular sliding plates 41A, 42A in opposite directions to each other, so that the recesses 44a of the two annular sliding plates 41A, 42A form recesses, and as shown in the lower drawing of fig. 3, the wire 3A is moved radially outward toward the recesses by the pressing force of the annular spring 5A serving as the second regulating portion. In this way, the control device enlarges the size of the sieve opening on the one end side so that the size of the sieve opening is different between the one end side and the other end side.
For example, the controller rotates one of the annular slide plates 41A clockwise and rotates the other annular slide plate 42A counterclockwise. The term "rotation" used herein means that the annular sliding plates 41A and 42A are rotationally moved by about half (slightly) the circumferential length of one wire 3A and stopped. As shown in the lower drawing of fig. 3, the concave portions 44a of the two annular sliding plates 41A, 42A overlap each other as viewed in the axial direction, and form a single depression. The wires 3A are pressed radially outward by the annular spring 5A, and thus enter the formed recesses and move radially outward by a length Δ R. This greatly changes the size of the mesh. From this state, when the two annular sliding plates 41A and 42A are rotated in opposite directions so that the two recesses 44a are circumferentially displaced from each other, the size of the sieve hole is reduced.
[1-2. Effect ]
According to the above-described screen device 1A, the size of the screen aperture can be changed only by slightly rotating the two annular sliding plates 41A, 42A provided at one end in the opposite directions to each other. Therefore, the sizes of the screen holes can be made different in the longitudinal direction of the screen device 1A at a low power cost, and multi-stage solid-liquid separation and classification can be performed by one screen device 1A.
Further, since the size of the screen hole is changed by the rotation of the annular sliding plates 41A and 42A provided on the outer periphery of the cylinder body 2A, the size of the screen hole can be easily changed even in the treatment of the object to be treated (for example, sludge or the like) supplied to the inside of the cylinder body 2A. This can achieve high work efficiency. Therefore, an increase in the cost of the entire system can be avoided.
Further, when the radially inner side of the annular sliding portion 4A (the two annular sliding plates 41A, 42A) has a shape along the trochoid, the size of the mesh formed between the adjacent wire rods 3A can be smoothly changed along with the movement of the concave shape and the convex shape along the trochoid (along with the amount of change in operation of the gears).
When the two annular sliding plates 91A and 92A are provided also at the other end, the wire 3A can be moved in the radial direction also at the other end side. Therefore, by controlling the rotation of the annular sliding plates 41A, 42A, 91A, and 92A at both ends independently or in conjunction with each other by the control device, the variation in the mesh width of the wire 3A from one end to the other end can be increased.
[1-3. Modified examples ]
The above-described structure is an example. For example, the cross-sectional shape of the wire 3A (moving element) is not limited to an isosceles triangle, and may be other triangles, polygons (quadrangle, hexagon, etc.) other than a triangle, and wires (square rod, round rod) having various cross-sectional shapes such as a semicircular shape, a circular shape, and an oval shape can be applied.
The shapes of the projections and recesses of the annular sliding plates 41A, 42A, 91A, and 92A are not limited to the shapes along the trochoid curve, and may be designed based on the cross-sectional shape of the wire 3A, the size of the mesh, and the like. Further, the control device may rotate one of the two annular sliding plates 41A, 42A in opposite directions relative to each other by fixing the other and rotating the other. The "oppositely directed to each other" is also included in the "mutually opposite directions" in the technical claims. Even in this case, if only one depression is formed by the two recesses 44a, the wire moves in the radial direction, and the size of the sieve opening changes. The same applies to the case where two annular sliding plates 91A, 92A are provided on the other end side.
The annular plate 7A and the annular sliding plates 91A and 92A are provided as third regulating portions at the other end of the screen device 1A shown in fig. 1, but either one may be provided as a third regulating portion. The cover member 6A at one end of the screen device 1A may be omitted, and instead of the cover member 6A, an annular plate similar to the annular plate 7A may be provided.
[2. Second embodiment ]
[2-1. Structure ]
Fig. 4 to 6 are views for explaining a screen device 1B according to a second embodiment. As shown in fig. 4, the screen device 1B includes a cylindrical body 2B having a predetermined inner diameter formed by arranging a plurality of linear wires 3B parallel to each other in a cylindrical shape. The cross-sectional shape of the wire 3B of the present embodiment, which is orthogonal to the longitudinal direction, is rectangular, and all the wires 3B have the same shape. The wire 3B is arranged in a cylindrical shape in a posture in which a rectangular plane (screen surface) formed by the long sides of the rectangle and a straight line extending in the longitudinal direction is directed toward the center axis O of the cylindrical body 2B. The axial direction of the central axis O of the cylindrical body 2B and the longitudinal direction of the wire 3B coincide with each other.
As shown in fig. 5, the cylindrical body 2B further includes second linear materials 7B arranged between the two adjacent linear materials 3B. That is, the cylindrical body 3B is configured by alternately arranging two types of wires 3B, 7B in a cylindrical shape. The cylinder 3B is rotatable about the central axis O.
The wire 3B is immovably fixed by a restricting portion described below. On the other hand, the second wire 7B is formed in a sectional shape or size that does not pass through between two adjacent wires 3B toward the inside in the radial direction of the cylindrical body 2B. In other words, the second wire 7B can move radially outward of the cylindrical body 2B between the two adjacent wires 3B and then return to the original position, but cannot pass radially inward. For example, in the case where the cross-sectional shape of the second wire 7B is circular, the diameter of the second wire 7B is larger than the interval of the radially inner portions of the adjacent two wires 3B. The diameter of the second wire 7B is preferably set to a size smaller than the interval between the radially outer portions of the adjacent two wires 3B.
In the present embodiment, the size of the mesh, that is, the size of the gap formed between the two adjacent wires 3B is obtained by adding the size of the second wire 7B interposed between the two wires 3B and the size of the two gaps formed between the two wires 3B.
As shown in fig. 4, the screen device 1B includes four regulating portions (a first regulating portion, a second regulating portion, a third regulating portion, and a fourth regulating portion) for regulating the movement of one end (left end in fig. 4) and the other end (right end in fig. 4) of each wire 3B to the radially outer side and the radially inner side, respectively. The screen device 1B includes an annular sliding portion 4B concentric with the cylindrical body 2B and a control device (for example, control devices 31 and 51 shown in fig. 10, and not shown in fig. 4).
The first regulating portion is provided integrally with the second regulating portion, and is a first fixing plate 5B that holds the interval between the one ends of the two adjacent wires 3B at a predetermined interval and is immovably fixed. In other words, the first fixing plate 5B is the first restriction portion, and is the second restriction portion. The third regulating portion is provided integrally with the fourth regulating portion, and is a second fixing plate 6B that holds the other ends of the two adjacent wires 3B at a predetermined interval and is immovably fixed. In other words, the second fixing plate 6B is the third restriction portion, and is the fourth restriction portion.
Each of the first fixing plate 5B and the second fixing plate 6B is an annular plate member concentric with the central axis O, and has the same shape. The first fixing plate 5B includes fitting portions 5j recessed at the radially inner end thereof in the same number as the wire 3B. The fitting portions 5j are provided at the same circumferential position as the wire rods 3B, and the wire rods 3B are fitted into the fitting portions 5j. The second fixing plate 6B is also configured similarly, and thus both end portions of each wire 3B cannot move.
The annular slide portion 4B includes two annular slide plates 41B and 42B having the same shape and disposed on the outer periphery of the cylinder body 2B. The rotation of the annular sliding plates 41B, 42B is controlled by a control device. The radially inner side of each of the annular sliding plates 41B, 42B has a shape (for example, a shape along a trochoid) in which a plurality of convex portions 43B of the same shape protruding toward the central axis O and a plurality of concave portions 44B of the same shape recessed therein are alternately and regularly connected in the circumferential direction. The total number of the convex portions 43b is the same as the total number of the concave portions 44 b. The number of the convex portions 43B is the same as the number (total number) of the wire rods 3B, and the annular sliding portion 4B functions as an internal gear.
In the screen device 1B, two annular sliding plates 91B and 92B similar to the annular sliding plates 41B and 42B are also provided at the other end of the cylindrical body 2B. That is, one end side and the other end side of the screen device 1B shown in fig. 4 are configured similarly. When the two annular sliding plates 91B, 92B are provided, the second wire 7B can be moved on the other end side as described later, and therefore, the change in the mesh width of the wire 3B from one end to the other end is increased.
The upper diagram of fig. 6 shows a state where the sizes of the mesh openings are the same on one end side and the other end side. In this state, the recesses 44B of the two annular sliding plates 41B, 42B are circumferentially displaced from each other as viewed in the axial direction, and the second wire 7B contacts both of the two adjacent wires 3B and blocks the gap (mesh) formed between the two wires 3B. From this state, the control device rotates the two annular sliding plates 41B, 42B in opposite directions to each other, so that the recesses 44B of the two annular sliding plates 41B, 42B form depressions, and as shown in the lower drawing of fig. 6, the second wire 7B is moved radially outward toward the depressions by gravity or centrifugal force, thereby opening the screen holes. In this way, the control device enlarges the size of the sieve opening on the one end side so that the size of the sieve opening is different between the one end side and the other end side.
For example, the controller rotates one of the annular slide plates 41B clockwise and rotates the other annular slide plate 42B counterclockwise. The term "rotation" used herein means, as in the first embodiment, that the annular sliding plates 41B and 42B are rotationally moved by about half (slightly) the circumferential length of one wire 3B and stopped. As shown in the lower drawing of fig. 6, the recessed portions 44B of the two annular sliding plates 41B, 42B are formed as one recess when they are overlapped in the circumferential direction.
When the cylindrical body 2B rotates around the central axis O, a centrifugal force acts on each second wire 7B, and thus enters the formed recess. Even when the cylindrical body 2B does not rotate, at least the second wire 7B located below enters the recess by gravity. Thereby, the second wire 7B moves from between the adjacent two wires 3B, and the size of the mesh changes. In this state, when the two annular sliding plates 41B and 42B are rotated in opposite directions so that the two recesses 44B are circumferentially displaced from each other as viewed from the axial direction, the size of the sieve holes is reduced.
[2-2. Effects ]
According to the above-described screen device 1B, the size of the screen hole can be changed simply by slightly rotating the two annular sliding plates 41B, 42B provided at one end in opposite directions to each other. Therefore, the sizes of the screen holes can be made different in the longitudinal direction of the screen device 1B at a low power cost, and multi-stage solid-liquid separation and classification can be performed by one screen device 1B.
Further, since the size of the screen holes is changed by the rotation of the annular sliding plates 41B and 42B provided on the outer periphery of the cylinder 2B, the size of the screen holes can be easily changed even in the treatment of the object to be treated (for example, sludge or the like) supplied to the inside of the cylinder 2B. This enables high work efficiency to be achieved. Therefore, an increase in the cost of the entire system can be avoided.
Further, when the radially inner side of the annular sliding portion 4B (the two annular sliding plates 41B, 42B) has a shape along the trochoid, the size of the mesh formed between the adjacent wire rods 3B can be smoothly changed along with the movement of the concave shape and the convex shape along the trochoid (along with the amount of change in operation of the gears).
When the two annular sliding plates 91B and 92B are also provided at the other end, the second wire 7B can be moved also at the other end side. Therefore, by controlling the rotation of the annular sliding plates 41B, 42B, 91B, and 92B at both ends independently or in conjunction with each other by the control device, the variation in the mesh width of the wire 3B from one end to the other end can be increased.
[2-3. Modified examples ]
The above-described structure is an example. For example, the cross-sectional shape of the wire 3B (fixing element) is not limited to a rectangle, and may be a polygon other than a rectangle (triangle, trapezoid, etc.), and wires having various cross-sectional shapes such as a semicircular shape, a circle, and an ellipse (square bar, triangular bar, trapezoid bar, round bar, etc.) may be applied. Similarly, the cross-sectional shape of the second wire 7B (moving element) is not limited to a circle, and may be a polygon other than a rectangle (trapezoid, pentagon, etc.), and wires having various cross-sectional shapes such as a semicircular shape, a circle, an ellipse, etc. (trapezoid bar, pentagon bar, round bar, etc.) can be applied.
Fig. 7 shows an example of a combination of a wire as a fixed element and a second wire as a moving element. The structure 1 in fig. 7 is a wire 3B and a second wire 7B constituting the cylindrical body 2B shown in fig. 5. In the case where the wire of the fixing element has an isosceles triangular sectional shape, the cylindrical body is formed in a posture in which the vertex angle thereof is directed radially outward. In addition, in the case where the wire rod of the fixing element has an isosceles trapezoid cross-sectional shape, the cylindrical body is formed in a posture in which the shorter one of the upper base and the lower base is directed radially outward. On the contrary, when the wires of the moving element have an isosceles trapezoid cross-sectional shape, the wires are arranged between two adjacent wires in a posture in which the longer one of the upper base and the lower base faces outward in the radial direction.
The shapes of the projections and recesses of the annular sliding plates 41B, 42B, 91B, and 92B are not limited to the shapes along the trochoid curve, and may be designed based on the cross-sectional shape of the second wire 7B, the size of the mesh, and the like. Further, the control device may be configured to rotate in opposite directions relative to each other by fixing one of the two annular sliding plates 41B, 42B and rotating the other. The "oppositely directed to each other" is also included in the "mutually opposite directions" in the technical claims. Even in this case, if only one recess is formed by the two recesses 44b, the wire moves, and the size of the sieve hole changes. The same applies to the case where two annular sliding plates 91B, 92B are provided on the other end side. The annular sliding plates 91B and 92B on the other end side may be omitted.
[3 ] third embodiment ]
Fig. 8 and 9 are views for explaining sieve devices 1C and 1D according to a third embodiment, and correspond to fig. 3. The third embodiment includes a configuration (pattern 1) in which the cylindrical body 2C is formed by the wire 3C configured to be movable as in the wire 3A of the first embodiment, and a configuration (pattern 2) in which the cylindrical body 2D is formed by the wire 3D configured to be immovable as in the wire 3B of the second embodiment. Hereinafter, these will be described in order.
[3-1. Structure (Pattern 1) ]
As shown in fig. 8, the wire rods 3C of the screen device 1C are arranged in parallel with each other in a cylindrical shape to form a cylindrical body 2C having a predetermined inner diameter, similarly to the wire rods 3A of the first embodiment. A pin 3p projecting in the axial direction is provided on an axial end face of each wire 3C. The pin 3p may be integrally formed with the wire 3C or may be mounted later. The cross-sectional shape of the pin 3p orthogonal to the axial direction (projecting direction) is an oblong shape extending in the radial direction of the cylindrical body 2C.
The screen device 1C includes four regulating portions (a first regulating portion, a second regulating portion, a third regulating portion, and a fourth regulating portion) for regulating the movement of each of the one end and the other end of each of the wires 3C to the radially outer side and the radially inner side, respectively, as in the screen device 1A of the first embodiment. The screen device 1C includes an annular sliding portion 4C concentric with the cylindrical body 2C and a control device (for example, control devices 31 and 51 shown in fig. 10, and not shown in fig. 8).
The annular sliding portion 4C is an annular plate member concentric with the central axis O, and is provided integrally with the first regulating portion. In other words, the annular sliding portion 4C also serves as the first regulating portion. That is, the annular sliding portion 4C has a function of restricting one end of each wire 3C from moving radially outward, and is controlled to rotate by the control device. The radially inner shape of the annular sliding portion 4C is a shape in which a plurality of convex portions 43C of the same shape protruding toward the central axis O and a plurality of concave portions 44C of the same shape recessed therein are alternately and regularly connected in the circumferential direction (for example, a shape along a trochoid line). The total number of the convex portions 43c is the same as the total number of the concave portions 44 c. The number of the convex portions 43C is the same as the number (total number) of the wire rods 3C, and the annular sliding portion 4C functions as an internal gear.
The second restricting portion is an annular plate 5C concentric with the cylindrical body 2C. The radially outer shape of the annular plate 5C corresponds one-to-one to the radially inner shape of the annular sliding portion 4C. The radially outer shape of the annular plate 5C of the present embodiment is a shape (for example, a shape along a trochoid) in which a plurality of convex portions 5e of the same shape protruding radially outward and a plurality of concave portions 5f of the same shape recessed and provided alternately and regularly continue in the circumferential direction.
The annular sliding portion 4C and the annular plate 5C are arranged at the same axial position, and a groove-like space 6C having the same width in the circumferential direction is formed by the radially inner end surface of the annular sliding portion 4C and the radially outer end surface of the annular plate 5C. Specifically, the concave portion 5f of the annular plate 5C is located radially inward of the convex portion 43C of the annular sliding portion 4C, and the convex portion 5e of the annular plate 5C is located radially inward of the concave portion 44C of the annular sliding portion 4C. The width (radial dimension) of the groove-like space 6C is set to be substantially the same as the radial length of the pin 3p. One end portion (here, the pin 3 p) of the wire 3C is slidably disposed in the groove-like space 6C.
The annular sliding portion 4C and the annular plate 5C may be supported so as to rotate about the central axis O in an integrated state, for example, by disposing a second portion (not shown) that connects a first portion (not shown) of the annular sliding portion 4C and a first portion (not shown) of the annular plate 5C, which are provided to protrude in the axial direction at a plurality of positions, to each other. Alternatively, the annular sliding portion 4C and the annular plate 5C may be supported to rotate around the central axis O. The other end of the cylindrical body 2C is not particularly shown, and may be configured in the same manner as the one end, or may be provided with the annular plate 7A (third regulating portion) and the annular spring 8A of the first embodiment.
The upper diagram of fig. 8 shows a state where the size of the mesh is the same on one end side and the other end side. In this state, the pin 3p is positioned between the convex portion 43C of the annular slide portion 4C and the concave portion 5f of the annular plate 5C, and the wire 3C enters the radially innermost position. From this state, the control device rotates the groove-like space 6C in the same direction by rotating the annular sliding portion 4C and the annular plate 5C in the same direction at the same speed, and moves (slides) the pin 3p of the wire 3C radially outward along the groove-like space 6C, as shown in the lower drawing of fig. 8. When the pin 3p is positioned between the concave portion 44C of the annular sliding portion 4C and the convex portion 5e of the annular plate 5C, the size of the sieve opening on one end side becomes the largest, and the size of the sieve opening differs between the one end side and the other end side. When the annular sliding portion 4C and the annular plate 5C are rotated in the same direction from this state, the groove-like space 6C is also rotated in the same direction, and the pin 3p of the wire rod 3C moves (slides) radially inward along the groove-like space 6C, so that the size of the screen hole is reduced.
[3-2. Structure (Pattern 2) ]
Next, a structure of forming the pattern 2 of the cylindrical body 2D from the wire 3D configured to be immovable will be described. As shown in fig. 9, the wires 3D of the screen device 1D are arranged in parallel to each other in a cylindrical shape to form a cylindrical body 2D having a predetermined inner diameter, similarly to the wires 3B of the second embodiment. The cylindrical body 2D further includes second linear members 7D arranged between the adjacent two linear members 3D. That is, the cylindrical body 3D is configured by alternately arranging two kinds of wire rods 3D and 7D in a cylindrical shape.
The second wire 7D is formed into a cross-sectional shape or a size that does not pass through between two adjacent wires 3D toward the inside in the radial direction of the cylindrical body 2D, as in the second wire 7B of the second embodiment. The cylinder 3D can rotate around the central axis O. A pin 7p protruding in the axial direction is provided on an axial end face of each second wire 7D. The pin 7p may be integrally formed with the second wire 7D or may be installed later. The cross-sectional shape of the pin 7p orthogonal to the axial direction (projecting direction) is an oblong shape extending in the radial direction of the cylindrical body 2D.
The screen device 1D includes four regulating portions (a first regulating portion, a second regulating portion, a third regulating portion, and a fourth regulating portion) for regulating the movement of each of the one end and the other end of each of the wires 3D to the radially outer side and the radially inner side, respectively, as in the screen device 1B of the second embodiment. The screen device 1D includes an annular sliding portion 4D concentric with the cylindrical body 2D, an annular plate 5D concentric with the cylindrical body 2D, and a control device (for example, control devices 31 and 51 shown in fig. 10, and not shown in fig. 9).
The first regulating portion is a first fixing plate (not shown) which is provided integrally with the second regulating portion, and which holds the interval between the one ends of the two adjacent wires 3D at a predetermined interval and fixes the one ends immovably. The third regulating portion is also a second fixing plate (not shown) which is provided integrally with the fourth regulating portion, and which is immovably fixed while keeping the interval between the other ends of the two adjacent wires 3D at a predetermined interval, as in the second embodiment. The first and second fixing plates have the same configuration as the first and second fixing plates 5B and 6B of the second embodiment, and therefore, the description thereof is omitted. The first fixing plate and the second fixing plate prevent the movement of both ends of each wire 3D.
The annular sliding portion 4D and the annular plate 5D are configured in the same manner as the pattern 1 of the third embodiment. The annular sliding portion 4D is an annular plate member concentric with the central axis O, and is controlled to rotate by the control device. The radially inner side of the annular sliding portion 4D has a shape (for example, a shape along a trochoid) in which a plurality of convex portions 43D having the same shape and protruding toward the central axis O and a plurality of concave portions 44D having the same shape and recessed toward the central axis O are alternately and regularly connected in the circumferential direction. The number of the convex portions 43D is the same as the total number of the wire rods 3D, and the annular sliding portion 4D functions as an internal gear.
The annular plate 5D is disposed in the vicinity of one end of the cylindrical body 2D (specifically, at the same axial position as the annular sliding portion 4D). The radially outer shape of the annular plate 5D corresponds one-to-one to the radially inner shape of the annular sliding portion 4D. The radially outer shape of the annular plate 5D of the present embodiment is a shape (for example, a shape along a trochoid) in which a plurality of convex portions 5g of the same shape protruding radially outward and a plurality of concave portions 5h of the same shape recessed and provided alternately and regularly continue in the circumferential direction.
The annular sliding portion 4D and the annular plate 5D are arranged so that a groove-like space 6D having the same width in the circumferential direction is formed by the radially inner end surface of the annular sliding portion 4D and the radially outer end surface of the annular plate 5D. Specifically, the concave portion 5h of the annular plate 5D is disposed radially inward of the convex portion 43D of the annular sliding portion 4D, and the convex portion 5g of the annular plate 5D is disposed radially inward of the concave portion 44D of the annular sliding portion 4D. The width (radial dimension) of the groove-like space 6D is set to be substantially the same as the radial length of the pin 7p. One end portion (here, the pin 7 p) of the second wire 7D is slidably disposed in the groove-like space 6D.
The upper diagram of fig. 9 shows a state where the sizes of the mesh openings are the same on one end side and the other end side. In this state, the pin 7p is positioned between the convex portion 43D of the annular slide portion 4D and the concave portion 5h of the annular plate 5D, and the second wire 7D enters the radially innermost side (between two adjacent wires 3D). From this state, the control device rotates the annular slide portion 4D and the annular plate 5D in the same direction to rotate the groove-like space 6D in the same direction, and as shown in the lower drawing of fig. 9, moves (slides) the pin 7p of the second wire 7D radially outward along the groove-like space 6C.
When the pin 7p is positioned between the concave portion 44D of the annular sliding portion 4D and the convex portion 5g of the annular plate 5D, the size of the sieve opening on one end side becomes the largest, and the size of the sieve opening differs between the one end side and the other end side. When the annular sliding portion 4D and the annular plate 5D are rotated in the same direction from this state, the groove-like space 6D is also rotated in the same direction, and the pin 7p of the second wire 7D moves (slides) radially inward along the groove-like space 6D, so that the size of the screen hole is reduced.
[3-3. Effect ]
According to the screen devices 1C and 1D of the patterns 1 and 2, the sizes of the screen holes can be changed simply by rotating the annular sliding portions 4C and 4D and the annular plates 5C and 5D in the same direction and at the same speed. Therefore, the sizes of the screen holes can be made different in the longitudinal direction of the screen devices 1C and 1D at a low power cost, and multi-stage solid-liquid separation and classification can be performed by one screen device 1C or 1D. In addition, in the case of the screen devices 1C and 1D, the annular sliding portions 4C and 4D provided integrally with the first regulating portion may be one member, and therefore, cost reduction can be achieved.
Further, when the radially inner side of the annular sliding portions 4C, 4D has a shape along a trochoid, the size of the mesh formed between the adjacent wire rods 3C, 3D can be smoothly changed along with the movement of the concave shape and the convex shape along the trochoid (along with the amount of change in operation of the gear).
[3-4. Modified examples ]
The structures of the patterns 1 and 2 are examples. For example, the screen devices 1C and 1D may further include end plates 8C and 8D, and the end plates 8C and 8D may include guide holes 8e and 8f for guiding the pins 3p and 7p to move in the radial direction. Fig. 8 and 9 show a configuration in which the end plates 8C and 8D are provided in a partially enlarged manner at a portion surrounded by a one-dot chain line. Note that the end plate 8C and the end plate 8D may not have the same configuration, but for convenience, two end plates are described together.
Each of the end plates 8C and 8D is a plate-like member disposed in the vicinity of one end of each of the cylindrical bodies 2C and 2D. The end plates 8C and 8D may be circular rings, for example, or may be circular plates that close openings on one end sides of the cylindrical bodies 2C and 2D. When the end plates 8C, 8D are annular, the positions thereof may be set between the end surfaces of the one end sides of the wires 3C, 7D and the annular sliding portions 4C, 4D and the annular plates 5C, 5D, for example. On the other hand, when the end plates 8C and 8D have a circular shape for closing the openings, they may be arranged at positions closer to one end side than the annular sliding portions 4C and 4D and the annular plates 5C and 5D.
The guide hole 8e is a recess or a through hole of a predetermined length radially extending from the central axis O of the cylindrical body 2C, and is formed in the end plate 8C in correspondence with the position of each wire 3C. The control device moves the one end of the wire 3C along the corresponding guide hole 8e by rotating the annular slide portion 4C. With the screen device 1C having such a configuration, each wire rod 3C can be stably moved.
The guide hole 8f is a recess or a through hole of a predetermined length radially extending from the central axis O of the cylindrical body 2D, and is formed in the end plate 8D in correspondence with the position of each second wire 7D. The control device moves one end of the second wire 3D along the corresponding guide hole 8f by rotating the annular slide portion 4D. With the screen device 1D having such a configuration, the second wires 3D can be stably moved. In the case where the end plates 8C and 8D have a circular shape for closing the openings, the guide holes 8e and 8f are preferably formed as recesses (not penetrating) in order to prevent leakage of the object to be treated.
The pins 3p and 7p are not essential and can be omitted. In this case, the end portion on one end side of the wire 3C or the second wire 7D may be slidably disposed in the groove- like spaces 6C and 6D, and the end portion on one end side of the wire 3C or the second wire 7D may be moved in the radial direction in accordance with the rotation of the groove- like spaces 6C and 6D.
The shapes of the wires 3C and 3D of the screen devices 1C and 1D may be changed to the shapes of the wires described in the modifications of the first and second embodiments. The radially inner side of the annular sliding portions 4C, 4D is an example, and the shape is not limited to the shape along the trochoid, and the radially outer side of the annular plates 4D, 5D may be a shape corresponding to the annular sliding portions 4C, 4D in a one-to-one correspondence.
[4. Application example ]
Next, a water treatment system to which the above-described screen devices 1A to 1D are applied will be described as an application example. In the following application example, any of the above-described sieve devices 1A to 1D can be used. Therefore, in the following description, the screen devices 1A to 1D are collectively referred to as "screen device 1", and similarly, the cylindrical bodies 2A to 2D provided in the screen devices 1A to 1D are referred to as "cylindrical bodies 2", the wire rods 3A to 3D are referred to as "wire rods 3", and the annular sliding portions 4A to 4D are referred to as "annular sliding portions 4".
[4-1. Water treatment System ]
Fig. 10 and 11 are views for explaining water treatment systems 10 and 10' to which the above-described screen device 1 is applied. The water treatment systems 10 and 10' are systems that concentrate and dewater sludge, feces and urine, or a mixture of sludge and feces and urine as treatment targets. The water treatment system 10 of fig. 10 is a sewage sludge dewatering system, and the water treatment system 10' of fig. 11 is a fecal treatment system.
The water treatment system 10, 10' has: mixing tanks 20, 20' for supplying at least one of a dehydration assistant, a metal removal chemical and a flocculant to the object to be treated, and mixing and coagulating them; a concentration system 30 to which the above-described screen device 1 is applied; and a dewatering system 50 to which the above-described screen apparatus 1 is applied. The concentration system 30 is an example of a water treatment system that introduces the liquid stored in the mixing tank 20 as the liquid to be treated. The dewatering system 50 is an example of a water treatment system that introduces the concentrated sludge discharged from the concentration system 30 into the interior as a treatment object.
In fig. 10, the configuration of a thickening system having a thickening apparatus 80 is shown by a broken line in addition to the thickening system 30, and the thickening apparatus 80 is not the screen apparatus 1 described above but a conventional screen apparatus (the size of the screen hole is constant). The thickener 80 receives the liquid stored in the mixing tank 20 and discharges the thickened sludge in which the liquid is thickened.
In general, since the concentration system and the dewatering system are respectively subjected to competitive bidding, the screen device 1 cannot necessarily be introduced into both systems. Therefore, a case where at least the screen device 1 is introduced into the dewatering system and a case where the screen device 1 is introduced into the concentration system (the concentration system 30) and a case where it is not introduced (a system using the concentration device 80) will be described in comparison.
As shown in fig. 10, the mixing tank 20 includes: a chemical mixing tank 24 for mixing a treatment target (for example, sludge) and a metal removal chemical supplied from a chemical supply device 25; and a condensate mixing tank 27 for mixing and condensing the liquid supplied from the chemical mixing tank 24 and the condensate supplied from the condensate supply device 28. In these mixing tanks 24 and 27, stirring devices 26 and 29 for stirring the liquid inside are provided.
The liquid to be treated mixed in the mixing tank 20 is supplied to the screen device 1 or the concentration device 80 of the concentration system 30. As described above, normally, only one of the concentration system 30 and the system using the concentration device 80 is provided as the concentration system, and therefore, the liquid to be treated is supplied to only one of the sieve device 1 and the concentration device 80 of the concentration system 30 in accordance with the provided concentration system.
When the liquid to be treated is supplied to the concentration system 30, the control device 31 changes the mesh size of the screen device 1 by feedback control (described later) based on the measurement result of the concentration measuring instrument 32 in the concentration system 30, and controls the drive device 33 to rotate the cylindrical body 2 (described later). Thereby, the liquid to be treated is subjected to solid-liquid separation in multiple stages, and the concentrated sludge (treated material) and the concentrated separated liquid are discharged. The discharged concentrated sludge (object to be treated) is supplied to the dewatering system 50. Here, the concentrated sludge (object to be treated) is liquid. The detailed structure of the concentration system 30 will be described later.
On the other hand, when the liquid to be treated is supplied to the concentration device 80, the liquid to be treated is subjected to solid-liquid separation in the concentration device 80, but since the size of the mesh is constant, the feedback control as in the concentration system 30 cannot be performed. Therefore, the concentration device 80 cannot cope with the change in the properties of the treatment target or the treatment target liquid, and it is difficult to stabilize the properties of the concentrated sludge separated by the concentration device 80 to desired properties. The concentrated sludge is stored in the storage tank 81 and then supplied to the mixing tank 82 for dewatering, but since the concentrated sludge may not have a desired property, at least one of the metal removal chemical supplied from the chemical supply device 83 and the condensate supplied from the condensate supply device 84 needs to be mixed again with the concentrated sludge in the mixing tank 82 for dewatering, and the concentrated sludge has a desired property.
That is, in the water treatment system using the concentration device 80, it is necessary to supply chemicals or condensing agents to the mixing tank 20 and the mixing tank 82 for dehydration. Therefore, as compared with the above-described water treatment system using the concentration system 30 using the screen device 1, the cost is inevitably increased not only from the viewpoint of the installation cost of the storage tank 81 and the mixing tank 82 for dehydration but also from the viewpoint of the cost of chemicals and condensing agents. Conversely, the water treatment system 10 using the concentration system 30 using the screen device 1 is superior to the water treatment system using the concentration device 80 in terms of installation costs and running costs.
The concentrated sludge (object to be treated) discharged from the dewatering mixing tank 82 is supplied to the dewatering system 50.
The concentrated sludge as the object to be treated is supplied to the screen device 1 of the dewatering system 50. In the dewatering system 50, the control device 51 changes the mesh size of the screen device 1 by feedback control (described later) based on the measurement result of the moisture content measuring instrument 52, and controls the drive device 53 (e.g., an electric motor) by the feedback control. The driving device 53 includes a device for rotating the cylindrical body 2, a device for rotating a screw shaft 46 described later, and a device for moving a back pressure plate 49 described later.
The dewatering system 50 discharges dewatered sludge obtained by dewatering the water content of the sludge. The detailed structure of the dewatering system 50 will be described later.
The water treatment system 10 'shown in fig. 11 differs from the water treatment system 10 shown in fig. 10 in that the mixing tank 20' includes a dehydration aid mixing tank 21 for mixing a treatment target (for example, feces and urine) with a dehydration aid supplied from a dehydration aid supply device 22. The dehydration auxiliary agent mixing tank 21 is provided with a stirring device 23 for stirring the liquid therein. In the water treatment system 10' of fig. 11, the liquid mixed in the dehydration assistant mixing tank 21 is supplied to the chemical mixing tank 24. The subsequent steps are the same as those of the water treatment system 10 of fig. 10, and therefore, the description thereof is omitted. Although not shown in fig. 11, the concentration device 80 may be applied to the water treatment system 10' of fig. 11 instead of the concentration system 30.
[4-2. Concentration System ]
Fig. 12 is a diagram illustrating the concentration system 30. The concentration system 30 includes: a screen device 1 in which a central axis O of a cylindrical body 2 is disposed substantially horizontally; a driving device 33 (e.g., an electric motor) for rotating the cylindrical body 2 about the central axis O; an inlet pipe 34 for supplying the liquid to be treated into the cylindrical body 2 from the other end (right end in fig. 12) of the screen device 1; and a concentration measuring instrument 32 that measures the concentration of the concentrated sludge discharged from one end (left end in fig. 12) of the screen device 1. In fig. 12, a rotation mechanism for rotating the annular sliding portion 4 of the screen device 1 is not shown.
The screen device 1 is disposed in the casing 35, and the concentrated separated liquid is discharged from a separated liquid discharge pipe 38 provided at a lower portion of the casing 35, and the concentrated sludge is discharged from an opening 37 at one end side of the casing 35. A strut or wall plate 36 for rotating the cylinder body 2 by the driving device 33 is fixed to the other end of the cylinder body 2. The operation of the drive device 33 is controlled by the control device 31. The driving device 33 may rotate the cylindrical body 2 at all times or may rotate the cylindrical body 2 intermittently. In the case of intermittently rotating the cylindrical body 2, the cylindrical body 2 may be rotated halfway in one direction, or may be rotated forward and backward (reciprocated).
The control device 31 performs feedback control based on the concentration of the concentrated sludge outputted from the concentration measuring instrument 32, and changes the size of the mesh. For example, if the concentration of the concentrated sludge is lower than a predetermined first threshold value (the water content is higher), the controller 31 determines that the mesh size at the current time point is small, and enlarges the mesh size. Conversely, if the concentration of the concentrated sludge is higher than the first threshold value (the water content is lower), it is determined that the mesh size at the current time point is large, and the mesh size is reduced. In this way, the controller 31 applies feedback based on the result measured by the density measuring device 32 to change the size of the sieve opening. Instead of using the first threshold value, the control device 31 may enlarge the size of the mesh as the concentration of the concentrated sludge is lower and reduce the size of the mesh as the concentration of the concentrated sludge is higher.
The controller 31 may perform feedback control on the driving device 33 so as to change the rotation speed of the cylinder 2 in accordance with the concentration of the concentrated sludge output from the concentration measuring instrument 32. For example, the rotation speed may be increased when the concentration is lower than a predetermined second threshold (water content is high), and the rotation speed may be decreased when the concentration is higher than the second threshold (water content is low). Instead of using the second threshold, the controller 31 may increase the rotation speed as the concentration is lower and decrease the rotation speed as the concentration is higher.
According to the above-described thickening system 30, since the above-described screen device 1 is applied, the sizes of the screen holes can be made different in the longitudinal direction of the screen device 1. Specifically, by reducing the size of the mesh on the side of the introduction pipe 34 and increasing the size of the mesh on the side of the opening 37, the liquid to be treated introduced into the interior of the cylindrical body 2 can be appropriately concentrated while being conveyed toward the opening 37. When the mesh size on the opening 37 side is increased, the difference in size between the mesh sizes on the inlet pipe 34 side and the opening 37 side is preferably at most about 3mm, for example.
[4-3. Dehydration System ]
Fig. 13 is a diagram illustrating the dewatering system 50. The dehydration system 50 includes: a screen device 1 in which a central axis O of a cylindrical body 2 is disposed substantially horizontally; an inlet pipe 54 for supplying the object to be treated from one end (left end in fig. 13) of the screen device 1 into the cylindrical body 2; a screw shaft 56 disposed inside the cylindrical body 2 and on the central axis O of the cylindrical body 2 to convey the object to be treated from one end to the other end (the right end in fig. 13); and a moisture content measuring device 52 for measuring the moisture content of the dewatered sludge discharged from the other end. In fig. 13, a rotation mechanism for rotating the annular sliding portion 4 of the screen device 1 is not shown. In fig. 13, for convenience, three control units (a rotation control unit 51x, a back pressure control unit 51y, and a mesh control unit 51 z) provided in the control device 51 are shown separately.
The screen device 1 is disposed in the casing 55, and the dehydrated separation liquid is discharged from a separation liquid discharge pipe 60 provided at a lower portion of the casing 55, and the dehydrated sludge is discharged from a discharge hole 61a at the other end side of the casing 55. A closing plate 58 for closing the opening is fixed to one end of the cylindrical body 2, and a back pressure plate 59 is provided to the other end of the cylindrical body 2. The blocking plate 58 is fixed to the introduction pipe 54 or the housing 55, for example. The blocking plate 58 may also serve as the end plates 8C and 8D described in the modification of the third embodiment. The back pressure plate 59 is a member movable on the central axis O, and a discharge hole 61a is formed by the back pressure plate 59 and the other end of the cylinder body 2. The dewatered sludge discharged from the discharge hole 61a is discharged through the dewatered sludge discharge pipe 61.
The introduction pipe 54 is positioned on the central axis O, penetrates the blocking plate 58, and opens inside the cylinder 2. The opening (introduction hole 54 a) of the introduction pipe 54 is disposed at the same axial position as the annular sliding portion 4, for example. The screw shaft 56 is disposed coaxially with the introduction pipe 54 and inside the introduction pipe 54 in a double pipe structure. The screw shaft 56 is provided with screw blades 57 having a length up to the vicinity of the inner periphery of the cylinder 2.
The control device 51 is provided with: a rotation control unit 51x for controlling the rotation of the screw shaft 56 and the rotation of the cylindrical body 2; a back pressure control unit 51y for controlling the pressing force on the back pressure plate 59; and a mesh control unit 51z for controlling the size of the mesh of the screen device 1.
The rotation controller 51x controls the driving device 53 (not shown in fig. 13) to rotate the screw shaft 56 and the cylindrical body 2 at different rotation speeds, conveys the object to be treated supplied from the introduction hole 54a to one end side of the cylindrical body 2 to the other end side while pressing the object, and discharges the dewatered sludge from the discharge hole 61a at the other end side.
The rotation control unit 51x performs feedback control of the torque for driving the screw shaft 56 and the cylinder 2 based on the moisture content of the dewatered sludge outputted from the moisture content measuring device 52 provided in the dewatered sludge discharge pipe 61. The torque may be detected by, for example, a load cell (not shown), or may be detected by measuring an inverter current value when the driving device 53 is an electric motor controlled by an inverter.
For example, when the water content ratio is higher than a predetermined third threshold, the rotation control unit 51x increases the torque compared to the torque at the current time point, and when the water content ratio is lower than the third threshold, the rotation control unit 51x decreases the torque compared to the torque at the current time point. Instead of using the third threshold value, the rotation control unit 51x may increase the torque as the water content is higher and decrease the torque as the water content is lower.
The back pressure control unit 51y performs feedback control of the position of the back pressure plate 59 based on the water content of the dehydrated sludge output from the water content meter 52, and adjusts the pressing force (back pressure). For example, if the water content ratio is higher than a predetermined fourth threshold, the back pressure control unit 51y increases the pressing force compared to the pressing force at the current time point, and if the water content ratio is lower than the fourth threshold, the back pressure control unit 51y decreases the pressing force compared to the pressing force at the current time point. Instead of using the fourth threshold, the back pressure control unit 51y may increase the pressing force as the water content is higher and decrease the pressing force as the water content is lower.
The mesh control unit 51z performs feedback control based on the moisture content of the dewatered sludge output from the moisture content measuring device 52, and changes the size of the mesh. For example, if the moisture content is higher than the predetermined fifth threshold, the mesh control unit 51z determines that the mesh at the current time point is small, and enlarges the size of the mesh. Conversely, if the moisture content is lower than the fifth threshold value, the sieve opening control unit 51z determines that the sieve opening at the current time point is large, and reduces the size of the sieve opening. Instead of using the fifth threshold value, the mesh control unit 51z may enlarge the size of the mesh as the moisture content is higher, and reduce the size of the mesh as the moisture content is lower.
The third threshold, the fourth threshold, and the fifth threshold may all be the same value or may be different values. In this way, the controller 51 applies feedback based on the result measured by the moisture content measuring device 52 to change the torque, the pressing force, and the size of the sieve opening. When the concentration measured by the concentration measuring instrument is represented by percentage [% ], the water content measured by the water content measuring instrument 52 can be represented by "water content [% ] = 100-concentration". That is, the concentration measuring instrument 32 can be used as the water content measuring instrument 52 of fig. 13.
According to the dewatering system 50, since the screen device 1 is applied, the sizes of the screen holes can be made different in the longitudinal direction of the screen device 1. Specifically, by increasing the size of the mesh on the inlet pipe 54 side and decreasing the size of the mesh on the discharge port 61a side, the dewatered sludge pressed inside the cylinder 2 can be appropriately dewatered while being conveyed to the discharge port 61a side. When the mesh size on the inlet pipe 54 side is increased, the difference in mesh size between the inlet pipe 54 side and the discharge hole 61a side is preferably, for example, about 0.1mm to 2mm at the maximum.
[4-4. Effect of Water treatment System ]
According to the water treatment systems 10 and 10' including the above-described concentration device 80 and the above-described dewatering system 50, since the above-described screen device 1 is applied to at least the dewatering system 50, the sizes of the screen holes can be made different in the longitudinal direction of the screen device 1. Therefore, the target processing capacity can be easily obtained by one screen device 1, and the cost of the entire system can be suppressed.
As shown in fig. 10, according to the water treatment system 10 in which the above-described screen device 1 is applied to both the concentration system 30 and the dehydration system 50, the screen holes can be made different in size in the longitudinal direction of the screen device 1 in the concentration system 30 in addition to the dehydration system 50. In this case, since the device shown by the broken line in fig. 10 is not necessary, the system is excellent also from the viewpoint of system construction, and the cost of the entire system can be further suppressed.
[4-5. Modified examples ]
The water treatment systems 10 and 10', the concentration system 30, and the dehydration system 50 are examples. For example, a water content measuring instrument may be used in the concentration system 30, and a concentration measuring instrument may be used in the dehydration system 50.
Description of reference numerals:
1. 1A, 1B, 1C, 1D sieve device
2. 2A, 2B, 2C, 2D cylinder
2g concave
3. 3A, 3B, 3C, 3D wire rod
3p pin
4. 4A, 4C annular sliding part (first restriction part)
4. 4B, 4D annular sliding part
5A Ring spring (second restriction)
5B first fixing plate (first and second restricting parts)
5C Ring plate (second restriction)
5D Ring plate
5e, 5g protrusions
5f, 5h recesses
5j fitting part
6A cover component (Ring plate)
6B second fixing plate (third and fourth restrictions)
6C, 6D groove-shaped space
7A Ring plate (third restriction, ring plate Member)
7B, 7D second wire
7p pin
8A Ring spring (fourth limiter)
8C, 8D end plate
8e, 8f guide holes
10. 10' water treatment system
20. 20' mixing tank
21. Dehydration auxiliary agent mixing tank
22. Dehydration auxiliary agent supply device
23. Stirring device
24. Medicine mixing tank
25. Medicine supply device
26. Stirring device
27. Condensing agent mixing tank
28. Condensing agent supply device
29. Stirring device
30. Concentration system
31. Control device
32. Concentration measuring device
33. Drive device
34. Ingress pipe
35. Shell body
36. Props or wall panels
37. Opening of the container
38. Separation liquid discharge pipe
41A, 41B, 42A, 42B ring-shaped sliding plate
43a, 43b, 43c, 43d convex parts
44a, 44b, 44c, 44d recess
50. Dewatering system
51. Control device
51x rotation control unit
51y back pressure control unit
51z mesh control part
52. Water content measuring instrument (Density measuring instrument)
53. Drive device
54. Ingress pipe
54a introduction hole
55. Shell body
56. Screw shaft
57. Helical blade
58. Blocking plate
59. Back pressure plate
60. Separation liquid discharge pipe
61. Dewatering sludge discharge pipe
61a discharge hole
80. Concentrating device (existing concentrating device, sieve mesh size constant)
81. Storage tank
82. Mixing tank for dehydration
83. Medicine supply device
84. Condensing agent supply device
91A, 92A annular slide plate (third restricting part, annular plate member)
91B, 92B ring-shaped sliding plate
O central axis.
Claims (13)
1. A screen assembly is provided, wherein,
the screen device has:
a cylindrical body having a predetermined inner diameter, which is formed by arranging a plurality of linear wires parallel to each other in a cylindrical shape;
a first regulating portion that regulates movement of one end of each of the wire rods to the outside in the radial direction of the cylindrical body;
a second regulating portion that regulates the movement of the one end of each of the wire rods radially inward of the cylindrical body;
a third regulating portion that regulates the other end of each of the wires to move radially outward of the cylindrical body;
a fourth regulating portion that regulates the other end of each of the wires to move radially inward of the cylindrical body;
an annular sliding portion disposed in the vicinity of the one end of the cylindrical body and concentric with a central axis of the cylindrical body; and
a control device for rotating the annular sliding part around the central axis,
the shape of the radially inner side of the annular sliding portion is a shape in which a plurality of convex portions of the same shape provided so as to protrude toward the central axis and a plurality of concave portions of the same shape provided so as to be recessed are alternately and regularly connected in the circumferential direction,
the number of the convex parts is the same as that of the wire rods,
the control device can enlarge the size of the sieve opening formed on the one end side between the two adjacent wire rods to be larger than the size of the sieve opening formed on the other end side between the two adjacent wire rods by rotating the annular sliding portion while the other end of the annular sliding portion is maintained at the predetermined inner diameter of the cylindrical body by the third restricting portion and the fourth restricting portion.
2. The screen apparatus of claim 1,
the annular sliding portion is provided integrally with the first regulating portion, and includes two annular sliding plates of the same shape arranged on the outer periphery of the cylindrical body,
the third restriction portion is an annular plate member disposed on an outer periphery of the cylindrical body,
the second and fourth restricting portions are both annular springs that press the wire rod radially outward of the cylindrical body,
the control device may be configured to rotate the two annular sliding plates in opposite directions to form recesses in the concave portions of the two annular sliding plates, and to move the wire toward the recesses radially outward by the pressing force of the second restricting portion to enlarge the size of the sieve holes on the one end side.
3. The screen apparatus of claim 1,
the cylindrical body further includes second linear members arranged between the adjacent two linear members and rotatable about the central axis,
the annular sliding part includes two annular sliding plates having the same shape and disposed on the outer circumference of the cylindrical body,
the first restricting portion is a first fixing plate which is provided integrally with the second restricting portion and which fixes the one ends of the two adjacent wires immovably while maintaining a predetermined interval therebetween,
the third regulating portion is a second fixing plate which is provided integrally with the fourth regulating portion and which is immovably fixed while maintaining the interval between the other ends of the two adjacent wires at the predetermined interval,
the second wire is formed into a sectional shape or size that does not pass through between adjacent two of the wires toward a radially inner side of the cylindrical body,
the control device forms a recess by the concave portions of the two annular sliding plates by rotating the two annular sliding plates in opposite directions to each other, and expands the size of the sieve opening on the one end side by moving the second wire toward the recess radially outward by gravity or centrifugal force.
4. The screen apparatus of claim 1,
the annular sliding portion is provided integrally with the first restricting portion,
the second restriction portion is an annular plate concentric with the central axis,
the shape of the radially outer side of the annular plate corresponds one-to-one to the shape of the radially inner side of the annular sliding portion,
the annular sliding portion and the annular plate are arranged so that groove-like spaces having the same width are formed in the circumferential direction by an end surface on the radially inner side of the annular sliding portion and an end surface on the radially outer side of the annular plate,
the control device moves the wire material along the groove-like space by rotating the annular sliding portion and the annular plate at the same speed and in the same direction, thereby changing the size of the mesh on the one end side.
5. The screen apparatus of claim 1,
the screen apparatus further includes an annular plate disposed near the one end of the cylindrical body and concentric with the central axis,
the cylindrical body further includes linear second wires arranged between two adjacent wires,
the first restricting portion is a first fixing plate which is provided integrally with the second restricting portion and which fixes the one ends of the two adjacent wires immovably while maintaining a predetermined interval therebetween,
the third regulating portion is a second fixing plate which is provided integrally with the fourth regulating portion and which is immovably fixed while maintaining the interval between the other ends of the two adjacent wires at the predetermined interval,
the second wire is formed into a sectional shape or size that does not pass through between adjacent two of the wires toward a radially inner side of the cylindrical body,
the shape of the radially outer side of the annular plate corresponds one-to-one to the shape of the radially inner side of the annular sliding portion,
the annular sliding portion and the annular plate are arranged so that groove-like spaces having the same width are formed in the circumferential direction by an end surface on the radially inner side of the annular sliding portion and an end surface on the radially outer side of the annular plate,
the control device moves the second wire along the groove-like space by rotating the annular sliding portion and the annular plate at the same speed and in the same direction, thereby changing the size of the sieve opening on the one end side.
6. The screen apparatus of any of claims 1, 2, and 4,
the screen assembly also has an end plate disposed adjacent the one end of the cylinder,
the end plate includes guide holes formed corresponding to positions of the respective wires and radially extending from a central axis of the cylindrical body by a predetermined length,
the control device moves the one end of the wire along the corresponding guide hole by rotating the annular sliding portion.
7. A screen apparatus according to claim 3 or 5,
the screen apparatus further has an end plate disposed adjacent to the one end of the cylindrical body,
the end plate includes guide holes formed corresponding to positions of the second wires and having a predetermined length radially extending from a central axis of the cylindrical body,
the control device rotates the annular sliding portion to move the second wire along the corresponding guide hole.
8. A screen arrangement according to any one of claims 1 to 7,
the shape of the radially inner side of the annular sliding portion is a shape along a trochoid.
9. A concentration system, wherein,
the concentration system has:
the screen apparatus of any one of claims 1 to 8, which disposes the central shaft substantially horizontally;
a drive device for rotating the cylindrical body of the screen device about the central axis;
an introduction pipe for supplying the liquid to be treated from the other end of the screen device into the cylindrical body; and
a concentration measuring device for measuring the concentration of the concentrated sludge discharged from the one end of the screen device,
the control device of the sieve device changes the size of the sieve hole according to the concentration output by the concentration measuring device.
10. A dewatering system, wherein,
the dehydration system has:
the screen apparatus of any one of claims 1 to 8, which disposes the central shaft substantially horizontally;
an introduction pipe for supplying the object to be treated from the one end of the screen device into the cylindrical body;
a screw shaft disposed inside the cylindrical body and on the central axis, for conveying the object to be treated from the one end to the other end; and
a water content measuring device for measuring the water content of the dewatered sludge discharged from the other end,
the control device of the sieve device changes the size of the sieve mesh according to the moisture content output by the moisture content measuring device.
11. A water treatment system for concentrating and dehydrating a sludge, a feces and urine or a mixture of the sludge and the feces and urine as a treatment target,
the water treatment system has:
a mixing tank for supplying at least one of a dehydration assistant, a metal removal chemical, and a flocculant to the processing object, and mixing and coagulating the supplied substances;
a thickening device that receives the liquid stored in the mixing tank and discharges a thickened sludge obtained by thickening the liquid; and
the dewatering system according to claim 10, wherein the concentrated sludge is introduced into the interior of the cylindrical body as the object to be treated.
12. A water treatment system for concentrating and dehydrating a sludge, a feces and urine or a mixture of the sludge and the feces and urine as a treatment target,
the water treatment system has:
a mixing tank for supplying at least one of a dehydration assistant, a metal removal chemical, and a flocculant to the object to be treated, and mixing and coagulating the mixture;
a thickening device that receives the liquid stored in the mixing tank and discharges a thickened sludge obtained by thickening the liquid;
a dewatering mixing tank that receives the concentrated sludge and mixes at least one of a metal removal chemical and a flocculant; and
a dewatering system as set forth in claim 10, wherein the liquid stored in said mixing tank for dewatering is introduced into the interior of said cylindrical body as the object to be treated.
13. A water treatment system for concentrating and dehydrating a sludge, a feces and urine or a mixture of the sludge and the feces and urine as a treatment target,
the water treatment system has:
a mixing tank for supplying at least one of a dehydration assistant, a metal removal chemical, and a flocculant to the processing object, and mixing and coagulating the supplied substances;
the concentration system according to claim 9, wherein a liquid stored in the mixing tank is introduced into the mixing tank as the liquid to be treated; and
the dewatering system according to claim 10, wherein the concentrated sludge discharged from the concentration system is introduced into the interior as the object to be treated.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020074086A JP6734496B1 (en) | 2020-04-17 | 2020-04-17 | Screen device, concentration system, dehydration system, and water treatment system |
| JP2020-074086 | 2020-04-17 | ||
| PCT/JP2021/008826 WO2021210291A1 (en) | 2020-04-17 | 2021-03-05 | Screen device, concentration system, and dehydration system, and water treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115315302A true CN115315302A (en) | 2022-11-08 |
Family
ID=71892325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180021597.6A Pending CN115315302A (en) | 2020-04-17 | 2021-03-05 | Sieve device, concentration system, dehydration system, and water treatment system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6734496B1 (en) |
| KR (1) | KR20220132661A (en) |
| CN (1) | CN115315302A (en) |
| TW (1) | TWI770889B (en) |
| WO (1) | WO2021210291A1 (en) |
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- 2021-03-05 WO PCT/JP2021/008826 patent/WO2021210291A1/en active Application Filing
- 2021-03-05 CN CN202180021597.6A patent/CN115315302A/en active Pending
- 2021-03-23 TW TW110110350A patent/TWI770889B/en active
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021210291A1 (en) | 2021-10-21 |
| KR20220132661A (en) | 2022-09-30 |
| TW202140124A (en) | 2021-11-01 |
| TWI770889B (en) | 2022-07-11 |
| JP6734496B1 (en) | 2020-08-05 |
| JP2021169076A (en) | 2021-10-28 |
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