TW202140124A - Screening apparatus, concentrating system, dewatering system, and water treatment system - Google Patents

Abstract

A screening apparatus (1) comprises a cylindrical body (2A) that includes a plurality of strips (3A) and that has a predetermined inner diameter; four restricting units that restrict movement of one end and the other end of each of the plurality of strips (3A) outward and inward in a diameter direction of the cylindrical body (2A); an annular sliding unit (4A) that is arranged at one end of the cylindrical body (2A); and a controlling device that rotates the annular sliding unit (4A) around a center axis (O). The inner side of the annular sliding unit (4A) has a shape formed by alternately and regularly repeating a convex part (43a) and a concave part (44a) protruding and depressing with respect to the center axis (O). The controlling device can widen an aperture formed between two neighboring strips (3A) on the one end to be larger than an aperture formed between the neighboring strips (3A) on the other end by rotating, under a state where the predetermined inner diameter of the other end of the cylindrical body (2A) is being maintained, the annular sliding unit (4A).

Description

Grid screen device, concentration system, dehydration system and water treatment system

The present invention relates to: a grid sieve device, a concentration system with the grid sieve device, a dehydration system with the grid sieve device, and a water treatment system with at least the dehydration system.

Solid-liquid separation or classification, etc., are used in various applications such as grid sieve devices that hinder the passage of substances of a predetermined size or more contained in the object to be processed and allow substances of less than the predetermined size to pass, or allow a predetermined amount of The grid through which the object to be processed passes (a gap formed between adjacent wires). In this kind of grid screen device, not only a device with a fixed grid size, but also a device with a variable grid size has been developed.

For example, the device disclosed in Patent Document 1 includes a fixed-side sieving member and a movable-side sieving member that can slide with respect to the fixed-side sieving member. By sliding the movable-side sieving member, the size of the mesh can be changed. .

In addition, in the device disclosed in Patent Document 2, the wire is stretched by a coil spring wound in a spiral shape, whereby the interval between adjacent wires can be expanded, that is, the size of the mesh can be changed. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-235293 [Patent Document 2] Japanese Patent No. 6459962

[The problem to be solved by the invention]

However, in the grid screen devices disclosed in Patent Documents 1 and 2, although the size of the grid can be changed, the grids at any position in the longitudinal direction of the grid screen device are set to the same size. Therefore, for example, in the case of multi-stage solid-liquid separation or classification, it is impossible to obtain the target processing capacity with only one grid sieve device due to the application. In this case, it is necessary to configure multiple grid screen devices with different grid sizes, which may increase the overall cost of the system.

The present invention was proposed in view of this problem, and its purpose is to provide a grid sieve device that can make the size of the grid different in the length direction of the grid sieve device, and use the grid sieve device for sludge or excrement Concentration system, dehydration system and water treatment system for processing etc. [Technical means to solve the problem]

The grid screen device of the present invention has: a cylindrical body with a predetermined inner diameter, which is formed by arranging a plurality of linear wires parallel to each other into a cylindrical shape; The movement of the outer side of the cylindrical body in the radial direction; the second restricting portion, which restricts the movement of the aforementioned end of each wire to the inner side of the diameter of the cylindrical body; the third restricting portion, which restricts the other end of the aforementioned wire to the aforementioned The movement of the cylindrical body on the outer side in the radial direction; the fourth restricting portion, which restricts the movement of the other end of the aforementioned wires to the inner side of the cylindrical body in the radial direction; the annular sliding portion, which is in line with the central axis of the aforementioned cylindrical body It is concentric, and is arranged near the one end of the cylindrical body; and a control device that rotates the annular sliding portion around the center axis. The shape of the ring-shaped sliding portion on the inner side in the radial direction is a shape in which a plurality of convex portions of the same shape protruding toward the center axis and a plurality of concave portions of the same shape provided as recesses are alternately and regularly continuous in the circumferential direction , The number of the aforementioned protrusions is the same as the number of the aforementioned wires. The control device rotates the annular sliding portion while maintaining the predetermined inner diameter of the cylindrical body at the other end by the third restricting portion and the fourth restricting portion, thereby enabling adjacent The size of the grid on the one end side formed between the two aforementioned wires is enlarged to be larger than the size of the grid on the other end side formed between the two adjacent wires on the other end.

The concentration system of the present invention has: the grid sieve device of the present invention, which arranges the central axis of the cylindrical body substantially horizontally; and a driving device that rotates the cylindrical body of the grid sieve device around the central axis; An introduction pipe for supplying the treated liquid to the inside of the cylindrical body from the other end of the grating device; and a concentration measuring device that measures the concentration of the concentrated sludge discharged from the one end of the grating device, The control device of the grid sieve device changes the size of the grid in response to the concentration output by the concentration measuring device.

The dewatering system of the present invention includes: the grid screen device of the present invention, which arranges the central axis of the cylindrical body substantially horizontally; Treatment object; screw shaft, which is arranged inside the cylindrical body and on the central axis, transports the object to be treated from the one end to the other end; a moisture content measuring device that measures the dehydration discharged from the other end The moisture content of the sludge, the control device of the grid sieve device, changes the size of the grid in response to the moisture content output by the moisture content measuring device.

The water treatment system of the present invention is a water treatment system that treats sludge, excrement, or a mixture of sludge and excrement as a treatment object, and concentrates and dehydrates the treatment object. It has a mixing tank that supplies the treatment object At least one of a dehydration aid, a metal removal agent, and a coagulant is mixed and coagulated; the concentration system of the present invention, which introduces the liquid stored in the mixing tank as the liquid to be treated into the interior; and the dehydration system of the present invention , Which introduces the thickened sludge discharged from the thickening system into the inside as the to-be-processed object. [Effects of the invention]

According to the grid sieve device of the present invention, the size of the grid can be changed in the length direction of the grid sieve device, so a single grid sieve device can be used to perform multi-stage solid-liquid separation or classification. In this way, it is possible to avoid an increase in the cost of the entire system.

According to each of the concentration system and the dewatering system of the present invention, since the grid sieve device of the present invention is applied, the size of the grid can be different in the length direction of the grid sieve device. Thereby, it is possible to appropriately concentrate and dehydrate while conveying each of the liquid to be processed and the object to be processed introduced into the inside of the cylindrical body.

According to the water treatment system of the present invention, the size of the grid can be different in the length direction of the grid screen device in both the concentration system and the dewatering system. In addition, by applying the grid sieve device of the present invention to both the concentration system and the dehydration system, it is also excellent from the viewpoint of the system architecture, and the overall cost of the system can be further suppressed.

Hereinafter, the grid screen device of the embodiment will be described with reference to the drawings, and then, a water treatment system having the grid screen device will be described. The embodiments and modifications shown below are only examples, and are not intended to exclude the application of various modifications or technologies that are not explicitly shown in the following embodiments. Each structure of this embodiment can be implemented with various modifications within a range that does not deviate from the spirit of these. Moreover, you can choose between them according to your needs, or combine them appropriately.

[Overview of grid screen device] The grid sieve device is equipped to pass through the sludge, excrement, or a mixture of these (hereinafter, also collectively referred to as "processed liquid" or "processed material") that does not reach a predetermined size, or The mesh used for the passage of a predetermined amount of processed objects is used for solid-liquid separation or classification according to its purpose. The grid screen device has a cylindrical body with a predetermined inner diameter, and is formed by arranging a plurality of linear wires parallel to each other in a cylindrical shape. The grid is the gap formed between two adjacent wires. The grid screen device of the present invention is configured such that the mesh size on one end side of the cylindrical body can be changed to be larger (expandable) than the mesh size on the other end side.

The grid screen device has four restricting parts (first restricting part, second restricting part, third restricting part, fourth restricting part) that restrict one end and the other end of each wire to the radially outer and radial directions The movement of each of the inside. That is, the first restricting portion restricts the movement of one end of each wire to the radially outer side of the cylindrical body, and the second restricting portion restricts the movement of one end of each wire to the radially inner side of the cylindrical body. In addition, the third restricting portion restricts the movement of the other end of each wire to the radially outer side of the cylindrical body, and the fourth restricting portion restricts the movement of the other end of each wire to the radially inner side of the cylindrical body.

In addition, the grid screen device has an annular sliding part arranged near one end of the cylindrical body, and a control device that rotates the annular sliding part around a central axis. The annular sliding part is a part concentric with the cylindrical body (having the same central axis as the central axis of the cylindrical body), and the cylindrical body is supported so as to be rotatable in the circumferential direction. The shape of the inner side of the ring-shaped sliding portion in the radial direction 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 provided as recesses are alternately and regularly continuous in the circumferential direction (e.g. Along the trochoid shape). The number of convex parts is the same as the total number of wires, and the ring-shaped sliding part functions as an internal gear.

The control device is an electronic control device (computer) that can be realized by applying a known hardware structure. The control device rotates the ring-shaped sliding portion while maintaining the predetermined inner diameter of the cylindrical body at the other end of the wire by the third restriction portion and the fourth restriction portion, so that the two adjacent wires The size of the grid on one end side formed by the gap is enlarged to be larger than the size of the grid on the other end side formed between two adjacent wires at the other end. In other words, the first restriction and the second restriction on one end of the cylindrical body restrict the movement of one end of the wire in the radial direction, but by rotating the ring-shaped sliding portion on the one end, the The grid between two adjacent wires expands at one end. On the other hand, the movement of the other end of the wire rod is restricted by the third restricting part and the fourth restricting part, so the size of the mesh is different in the longitudinal direction of the grid screen device.

According to this grid screen device, the size of the grid can be changed in the length direction of the grid screen device, so a single grid screen device can be used to perform multi-stage solid-liquid separation or classification. In this way, it is possible to avoid an increase in the cost of the entire system. In addition, the multi-stage referred to here includes continuous stage changes. Moreover, when the shape of the inner side of the ring-shaped sliding portion in the radial direction is along the trochoid shape, it can be accompanied by the movement of the concave and convex shapes along the trochoid (with the amount of change in the movement of the gear), To smoothly change the size of the grid formed between adjacent wires.

Hereinafter, the specific structure of the grid screen device will be described with three embodiments. Next, a water treatment system (including a concentration system and a dehydration system) using any of the grid screen devices will be described. In addition, for the wire (including the second wire) described below, for example, a wedge-shaped screen wire can be used.

[1. The first embodiment] [1-1. Structure] Figures 1 to 3 are diagrams for explaining the grid screen device 1A of the first embodiment. As shown in FIG. 1, the grid screen device 1A has a cylindrical body 2A with a predetermined inner diameter, and is formed by arranging a plurality of linear wires 3A parallel to each other in a cylindrical shape. In the wire 3A of this embodiment, the cross-sectional shape orthogonal to the longitudinal direction is an equilateral triangle, and all the wire 3A have the same shape. The wire 3A is arranged in a cylindrical shape in a rectangular plane formed by the base of the equilateral triangle and a straight line extending in the longitudinal direction (lattice surface) in a posture facing the central axis O of the cylindrical body 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 addition, unlike the second embodiment described later, in this embodiment, the mesh size is the size of the interval between two adjacent wires 3A. Each wire 3A is locked so as to be movable in the radial direction, but the movement is restricted by the following restricting portion.

The grid screen device 1A has four restriction portions (first restriction portion, second restriction portion, third restriction portion, and fourth restriction portion), which restrict one end (left end in FIG. 1) and the other end ( The right end in FIG. 1) moves toward each of the radially outer and radially inner sides. In addition, the grid screen device 1A has an annular sliding portion 4A concentric with the cylindrical body 2A, and a control device (for example, the control devices 31 and 51 shown in FIG. 10, which are not shown in FIG. 1).

The ring-shaped sliding part 4A is provided integrally with the first restricting part, and includes two ring-shaped sliding plates 41A and 42A that are arranged on the outer circumference of the cylindrical body 2A and have the same shape as each other. In other words, the ring-shaped sliding portion 4A is also the first restricting portion. That is, the two ring-shaped sliding plates 41A and 42A have a function of restricting the movement of one end of each wire 3A to the outside in the radial direction, and the rotation is controlled by the control device. The shape of each ring-shaped sliding plate 41A, 42A in the radial direction is such that a plurality of convex portions 43a of the same shape protruding toward the central axis O and a plurality of concave portions 44a of the same shape recessed and provided alternately and regularly in the circumferential direction A continuous shape (for example, a shape along a trochoid). The total number of convex portions 43a is the same as the total number of concave portions 44a. The number of convex portions 43a is the same as the number (total number) of the wires 3A, and the ring-shaped sliding portion 4A has a function as an internal gear. As shown in Figures 2 and 3, the ring-shaped sliding plates 41A, 42A are in a state where each convex portion 43a enters between the two adjacent wires 3A, and the concave portion 44a becomes a corner where the concave portion 44a is in surface contact with the wire 3A. The shape of the corners.

In the grid screen device 1A, the second restricting portion is a ring spring 5A that presses one end of the wire 3A to the outside in the radial direction of the cylindrical body 2A. In FIG. 1, although two ring springs 5A of the same shape are exemplified as the second restricting portion, the number of ring springs 5A is not limited to two, and may be one, for example. The ring spring 5A is fitted, for example, in a recess 2g formed on a grid surface at one end of the cylindrical body 2A (each wire 3A). In this case, the inner surface of the ring spring 5A does not protrude in the radial direction from the grid screen surface, but is arranged so as to be substantially the same surface as the grid screen surface.

In addition, in the grid screen device 1A, a cover member 6A formed of a thin plate is fixed to one end of a cylindrical body 2A. The cover member 6A includes a cylindrical wall coaxial with the central axis O and an annular flat plate portion (ring portion), and is fixed to, for example, a housing (not shown) covering the entire screen device 1A. The cover member 6A may be arranged so that the cylindrical wall covers the two ring-shaped sliding plates 41A, 42A. In this case, the positional deviation of the two ring-shaped sliding plates 41A, 42A in the radial direction can be restricted. In addition, the cover member 6A is omitted in FIGS. 2 and 3.

The third restricting portion provided at the other end of the cylindrical body 2A is at least one of the annular plate 7A and the two annular sliding plates 91A and 92A arranged on the outer periphery of the cylindrical body 2A. The ring-shaped plate 7A is a ring-shaped plate member that restricts the other end of the wire 3A from moving outward in the radial direction, and is fixed to the aforementioned housing, for example. On the other hand, the ring-shaped sliding plates 91A, 92A are ring-shaped plate members configured in the same manner as the ring-shaped sliding plates 41A, 42A provided on one end side.

In addition, the fourth restricting portion is an annular spring 8A that presses the other end of the wire 3A toward the outside in the radial direction of the cylindrical body 2A. The grid screen device 1A shown in FIG. 1 is provided with a ring-shaped plate 7A and two ring-shaped sliding plates 91A and 92A, and one end side and the other end side have the same structure. When two ring-shaped sliding plates 91A and 92A are provided as the third restricting portion, the wire 3A can be moved on the other end side as described later, so the mesh width of the wire 3A from one end to the other end is equal to Changes will increase.

The upper diagram of FIG. 3 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 recesses 44a of the two ring-shaped sliding plates 41A, 42A are offset in the circumferential direction when viewed from the axial direction, and the wire 3A is pressed by the ring spring 5A to form the most recessed portion from the recess 44a. The length ΔR enters a state of radially inner side. The control device rotates the two ring-shaped sliding plates 41A, 42A in opposite directions from each other from this state, thereby forming a depression with the recesses 44a of the two ring-shaped sliding plates 41A, 42A, as shown in the lower diagram of FIG. 3 , The wire 3A is moved toward the outer side of the recess in the radial direction by the pressing force caused by the second restricting portion, that is, the ring spring 5A. As described above, the control device expands the mesh size on one end side so that the mesh size on one end side and the other end side are different.

For example, the control device rotates one ring-shaped sliding plate 41A clockwise, and the other ring-shaped sliding plate 42A rotates counterclockwise. In addition, the "rotation" referred to here means that each of the ring-shaped sliding plates 41A, 42A is rotated and stopped by half the length of the wire 3A in the circumferential direction (minorly). As shown in the lower diagram of FIG. 3, the recesses 44a of the two ring-shaped sliding plates 41A and 42A overlap and become one recess when viewed from the axial direction. Each wire 3A is applied with a pressing force radially outward by the ring spring 5A, enters the formed recess, and moves radially outward by a length ΔR. In this way, the grid size is greatly changed. In addition, from this state, if the two ring-shaped sliding plates 41A and 42A are rotated in the opposite direction to each other so that the two concave portions 44a are offset in the circumferential direction, the mesh size is reduced.

[1-2. Effect] According to the aforementioned grid screen device 1A, the grid size can be changed by slightly rotating the two ring-shaped sliding plates 41A and 42A provided at one end in the opposite direction to each other. Therefore, the grid size in the longitudinal direction of the grid sieve device 1A can be made different with a smaller power cost, and a single grid sieve device 1A can be used to perform multi-stage solid-liquid separation or classification.

In addition, the mesh size is changed by the rotation of the ring-shaped sliding plates 41A, 42A provided on the outer circumference of the cylindrical body 2A, so even the processed objects (such as sludge, etc.) supplied to the inner side of the cylindrical body 2A The grid size can also be easily changed during processing. In this way, high work efficiency can be achieved. Therefore, it is possible to avoid an increase in the cost of the entire system.

In addition, when the shape of the inner side of the ring-shaped sliding portion 4A (two ring-shaped sliding plates 41A, 42A) in the radial direction is a shape along the trochoid, it may be accompanied by a concave shape and a convex shape along the trochoid. The movement of (accompanied by the amount of change in the operation of the gear) smoothly changes the size of the grid formed between the adjacent wires 3A.

In addition, when the two ring-shaped sliding plates 91A and 92A are also provided at the other end, the wire 3A can also be moved in the radial direction at the other end. Therefore, the ring-shaped sliding plates 41A, 42A and 91A, 92A at both ends are independent or linked to control the rotation by the control device, thereby increasing the variation of the grid width of the wire 3A from one end to the other.

[1-3. Modifications] The above structure is an example. For example, the cross-sectional shape of the wire 3A (moving element) is not limited to equilateral triangles, but other triangles or polygons other than triangles (tetragonal or hexagonal, etc.) can be used. Semicircular, circular, elliptical, etc. Wires with various cross-sectional shapes (corner rods or round rods).

The uneven shape of the ring-shaped sliding plates 41A, 42A, 91A, 92A is not limited to the shape along the trochoid, and may be designed based on the cross-sectional shape of the wire 3A, the size of the mesh, and the like. In addition, the control device may fix one of the two ring-shaped sliding plates 41A, 42A to rotate the other, thereby rotating the two ring-shaped sliding plates 41A, 42A in opposite directions relative to each other. The "relatively opposite directions to each other" is also included in the "reverse directions to each other" of the request item. In this case as well, if one recess is formed by the two recesses 44a, the wire will move in the radial direction and the mesh size will change. The same applies to the case where two ring-shaped sliding plates 91A and 92A are provided on the other end side.

At the other end of the grid screen device 1A shown in FIG. 1, the ring-shaped plate 7A and the ring-shaped sliding plates 91A and 92A are provided as the third restricting portion, but either one may be provided as the third restricting portion. In addition, the cover member 6A at one end of the grid screen device 1A may be omitted, and the cover member 6A may be replaced with an annular plate that is the same as the annular plate 7A.

[2. The second embodiment] [2-1. Structure] 4 to 6 are diagrams for explaining the grid screen device 1B of the second embodiment. As shown in FIG. 4, the grid screen device 1B has a cylindrical body 2B with a predetermined inner diameter, and is formed by arranging a plurality of linear wires 3B parallel to each other in a cylindrical shape. The wire 3B of this embodiment has a rectangular cross-sectional shape orthogonal to the longitudinal direction, and all the wires 3B have the same shape. The wire 3B has a rectangular plane formed by the long sides of the rectangle and a straight line extending in the longitudinal direction (cell screen surface), and is arranged in a cylindrical shape in a posture facing the central 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 linear second wire rods 7B, which are respectively arranged between two adjacent wire rods 3B. That is, the cylindrical body 3B is configured by alternately arranging two types of wires 3B and 7B in a cylindrical shape. The cylindrical body 3B can rotate around the central axis O.

The wire 3B is fixed so that it cannot move by the following restriction|limiting part. On the other hand, the second wire 7B is formed in a cross-sectional shape or size that cannot be detached toward the inner side of the cylindrical body 2B in the radial direction between two adjacent wires 3B. In other words, the second wire 7B moves to the outer side of the cylindrical body 2B in the radial direction between the two adjacent wires 3B, and then can return to the original position, but cannot be separated from the inner side in the radial direction. For example, when the cross-sectional shape of the second wire 7B is circular, the diameter of the second wire 7B is larger than the distance between the inner portions of the two adjacent wires 3B in the radial direction. In addition, the diameter of the second wire 7B is preferably set to be smaller than the distance between the outer portions of the two adjacent wires 3B in the radial direction. Moreover, in this embodiment, the size of the grid, that is, the size of the gap formed between two adjacent wires 3B, is the second wire 7B between the two wires 3B and the second wire 7B formed in the The total size of the two gaps between each of the two wires 3B.

As shown in Fig. 4, the grid screen device 1B has four restricting parts (first restricting part, second restricting part, third restricting part, fourth restricting part), which restrict one end of each wire 3B (in Fig. 4 Each of the left end) and the other end (the right end in FIG. 4) move to each of the radially outer side and the radially inner side. In addition, the grid screen device 1B has an annular sliding portion 4B concentric with the cylindrical body 2B, and a control device (for example, the control devices 31 and 51 shown in FIG. 10, which are not shown in FIG. 4).

The first restricting portion is integrally provided with the second restricting portion, and is a first fixing plate 5B that keeps the distance between one ends of two adjacent wires 3B at a predetermined interval and fixes them so as to be immovable. In other words, the first fixing plate 5B is the first restricting portion and the second restricting portion. In addition, the third restricting portion is integrally provided with the fourth restricting portion, and is a second fixing plate 6B that keeps the distance between the other ends of the two adjacent wires 3B at a predetermined interval and fixes them so as to be immovable. In other words, the second fixing plate 6B is the third restricting portion and the fourth restricting portion. The first fixing plate 5B and the second fixing plate 6B are both circular plate members concentric with the central axis O, and are formed in the same shape as each other. The first fixing plate 5B is provided with the same number of fitting portions 5j as the wire 3B, which are recessed and provided at the inner end portion in the radial direction. The fitting part 5j is provided in the same circumferential direction position as the wire 3B, and each wire 3B is fitted in each fitting part 5j. The second fixing plate 6B is also configured in the same manner, and the both ends of each wire 3B cannot be moved by these.

The ring-shaped sliding portion 4B includes two ring-shaped sliding plates 41B and 42B arranged on the outer periphery of the cylindrical body 2B and having the same shape as each other. The ring-shaped sliding plates 41B and 42B are controlled to rotate by a control device. The shape of the inner side in the radial direction of each ring-shaped sliding plate 41B, 42B is such that 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 and provided alternately and regularly in the circumferential direction A continuous shape (for example, a shape along a trochoid). The total number of convex portions 43b is the same as the total number of concave portions 44b. The number of convex portions 43b is the same as the number (total number) of the wires 3B, and the ring-shaped sliding portion 4B has a function as an internal gear.

In the grid screen device 1B, two ring-shaped sliding plates 91B and 92B similar to the ring-shaped sliding plates 41B and 42B are also provided at the other end of the cylindrical body 2B. That is, the grid screen device 1B shown in FIG. 4 has the same structure on one end side and the other end side. When the two ring-shaped sliding plates 91B and 92B are provided, the second wire 7B can be moved on the other end side as described later, so the change in the mesh width of the wire 3B from one end to the other end increases.

The upper diagram of FIG. 6 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 recesses 44b of the two ring-shaped sliding plates 41B, 42B are offset in the circumferential direction when viewed from the axial direction, and the second wire 7B is in contact with both of the two adjacent wires 3B, and blocks the The gap (mesh) formed between the two wires 3B. The control device rotates the two ring-shaped sliding plates 41B, 42B in opposite directions from each other from this state, thereby forming a depression with the recesses 44b of the two ring-shaped sliding plates 41B, 42B, as shown in the lower diagram of FIG. 6 , By gravity or centrifugal force, the second wire 7B is moved toward the outside of the recess in the radial direction, thereby opening the grid. As described above, the control device expands the mesh size on one end side so that the mesh size on one end side and the other end side are different.

For example, the control device rotates one ring-shaped sliding plate 41B clockwise, and rotates the other ring-shaped sliding plate 42B counterclockwise. In addition, the "rotation" referred to here, as in the first embodiment, means that the ring-shaped sliding plates 41B and 42B are rotated and moved by half the length of the wire 3B in the circumferential direction (minorly). The meaning of stop. As shown in the lower diagram of FIG. 6, when the recesses 44b of the two ring-shaped sliding plates 41B and 42B overlap in the circumferential direction, they become a single depression.

When the cylindrical body 2B rotates around the central axis O, a centrifugal force acts on each second wire 7B, so it enters into the formed depression. In addition, even when the cylindrical body 2B is not rotating, at least the second wire 7B located below will enter the recess by gravity. Thereby, the second wire 7B is moved from between the two adjacent wires 3B, and the mesh size is changed. Also, from this state, if the two ring-shaped sliding plates 41B and 42B are rotated in the opposite direction to each other so that the two recesses 44b are offset in the circumferential direction when viewed from the axial direction, the grid size is reduced.

[2-2. Effect] According to the aforementioned grid screen device 1B, the grid size can be changed by slightly rotating the two ring-shaped sliding plates 41B and 42B provided at one end in the opposite direction to each other. Therefore, a smaller power cost can be used to make the grid size of the grid screen device 1B different in the longitudinal direction, and a single grid screen device 1B can be used to perform multi-stage solid-liquid separation or classification.

In addition, the mesh size is changed by the rotation of the ring-shaped sliding plates 41B and 42B provided on the outer circumference of the cylindrical body 2B, so even the processed objects (such as sludge, etc.) supplied to the inside of the cylindrical body 2B The grid size can also be easily changed during processing. In this way, high work efficiency can be achieved. Therefore, it is possible to avoid an increase in the cost of the entire system.

Moreover, when the shape of the inner side in the radial direction of the ring-shaped sliding portion 4B (two ring-shaped sliding plates 41B, 42B) is a shape along the trochoid, it may be accompanied by a concave shape and a convex shape along the trochoid. The movement (accompanied by the change in the movement of the gear) smoothly changes the mesh size of the 3B formed between the adjacent wires.

Moreover, when two ring-shaped sliding plates 91B and 92B are also provided at the other end, the second wire 7B can also be moved at the other end. Therefore, the ring-shaped sliding plates 41B, 42B and 91B, 92B at both ends are independent or linked to control the rotation by the control device, thereby increasing the variation of the grid width of the wire 3B from one end to the other.

[2-3. Modifications] The above structure is an example. For example, the cross-sectional shape of the wire 3B (fixing element) is not limited to a rectangle, but can also be polygonal (triangular, trapezoidal, etc.) other than rectangles. Wires with various cross-sectional shapes such as semicircular, circular, elliptical, etc. can be applied (four corners). Rods, triangular rods, trapezoidal rods, round rods, etc.). Similarly, the cross-sectional shape of the second wire 7B (moving element) is not limited to a circular shape, and can be a polygonal shape (trapezoid or pentagonal shape, etc.) other than a rectangle, and various cross-sectional shapes such as semicircular, circular, elliptical, etc. are applicable. Wires (trapezoidal rods, pentagonal rods, round rods, etc.).

An example of the combination of the fixed element, that is, the wire, and the movable element, that is, the second wire, is shown in FIG. 7. The structure 1 in FIG. 7 is the wire 3B and the second wire 7B constituting the cylindrical body 2B shown in FIG. 5. When the wire of the fixing element has a cross-sectional shape of an equilateral triangle, the cylindrical body is formed in a posture with the vertex angle facing outward in the radial direction. When the wire of the fixing element has a cross-sectional shape of a symmetrical trapezoid, the shorter side of the upper side and the lower side faces the outer side in the radial direction to form a cylindrical body. Conversely, when the wire of the moving element has a cross-sectional shape of a symmetrical trapezoid, the longer side of the upper side and the lower side is arranged in a posture toward the outside in the radial direction, and is arranged between two adjacent wires.

In addition, the uneven shape of the ring-shaped sliding plates 41B, 42B, 91B, 92B is not limited to the shape along the trochoid, and may be designed based on the cross-sectional shape of the second wire 7B, the size of the grid, and the like. In addition, the control device may fix one of the two ring-shaped sliding plates 41B and 42B to rotate the other, thereby rotating in opposite directions relative to each other. The "relatively opposite directions to each other" is also included in the "reverse directions to each other" of the request item. In this case as well, if one recess is formed by the two recesses 44b, the wire will move and the mesh size will change. The same applies to the case where two ring-shaped sliding plates 91B and 92B are provided on the other end side. In addition, the ring-shaped sliding plates 91B and 92B on the other end side may be omitted.

[3. The third embodiment] 8 and 9 are diagrams for explaining the grid screen devices 1C and 1D of the third embodiment, and are diagrams corresponding to FIG. 3. The third embodiment includes the same structure as the wire 3A of the first embodiment in which the cylindrical body 2C is formed by the movable wire 3C (pattern 1), which is the same as the wire 3B of the second embodiment Specifically, the structure of the cylindrical body 2D (pattern 2) is formed by the wire 3D that is configured to be immovable. Hereinafter, these will be explained in order.

[3-1. Structure (Figure 1)] As shown in FIG. 8, the wire 3C of the grid screen device 1C is arranged in parallel to each other in a cylindrical shape, like the wire 3A of the first embodiment, and forms a cylindrical body 2C with a predetermined inner diameter. A pin 3p protruding in the axial direction is provided on an end surface in the axial direction of each wire 3C. The pin 3p can be integrally formed with the wire 3C, or it can be installed. The cross-sectional shape orthogonal to the axial direction (projection direction) of the pin 3p becomes an oblong shape along the radial direction of the cylindrical body 2C.

The grid sieve device 1C, like the grid sieve device 1A of the first embodiment, has four restriction portions (a first restriction portion, a second restriction portion, a third restriction portion, and a fourth restriction portion), which restrict each wire 3C Each of one end and the other end moves toward each of the radially outer side and the radially inner side. In addition, the grid screen device 1C has an annular sliding portion 4C concentric with the cylindrical body 2C, and a control device (for example, the control devices 31 and 51 shown in FIG. 10, which are not shown in FIG. 8).

The ring-shaped sliding portion 4C is a ring-shaped plate member concentric with the central axis O, and is provided integrally with the first restricting portion. In other words, the ring-shaped sliding portion 4C is also the first restricting portion. That is, the ring-shaped sliding portion 4C has a function of restricting one end of each wire 3C from moving outward in the radial direction, and the rotation is controlled by the control device. The shape of the annular sliding portion 4C on the inner side in the radial direction is formed by 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 and arranged alternately and regularly in the circumferential direction. The shape (for example, the shape along the trochoid). The total number of convex portions 43c is the same as the total number of concave portions 44c. The number of convex portions 43c is the same as the number (total number) of the wires 3C, and the ring-shaped sliding portion 4C has a function as an internal gear.

The second restricting portion is an annular plate 5C concentric with the cylindrical body 2C. The shape of the ring-shaped plate 5C on the outer side in the radial direction corresponds one-to-one to the shape of the ring-shaped sliding portion 4C on the inner side in the radial direction. The shape of the annular plate 5C of the present embodiment on the outer side in the radial direction is such that a plurality of convex portions 5e of the same shape and a plurality of concave portions 5f of the same shape provided protruding outward in the radial direction are alternately and regularly arranged in the circumferential direction. A continuous shape (for example, a shape along a trochoid).

The ring-shaped sliding portion 4C and the ring-shaped plate 5C are arranged at the same axial position, and the radially inner end surface of the ring-shaped sliding portion 4C and the radially outer end surface of the ring-shaped plate 5C have the same width in the circumferential direction. The groove-like space 6C. Specifically, it is arranged such that the concave portion 5f of the annular plate 5C is positioned on the radially inner side of the convex portion 43c of the annular sliding portion 4C, and the convex portion 5e of the annular plate 5C is positioned on the concave portion 44c of the annular sliding portion 4C. Inward in the radial direction. The width (diametrical dimension) of the groove-shaped space 6C is set to be substantially the same as the radial length of the pin 3p. In the groove-shaped space 6C, one end portion (here, the pin 3p) of the wire 3C is arranged so as to be slidable.

In addition, the ring-shaped sliding portion 4C and the ring-shaped plate 5C are provided with, for example, a second portion (not shown), which makes the first portion (not shown) of the ring-shaped sliding portion 4C protruding in the axial direction at plural places and the ring The first parts (not shown) of the shaped plates 5C are connected to each other and may be supported to rotate around the central axis O in a state where they are integrated with each other. Alternatively, each of the ring-shaped sliding portion 4C and the ring-shaped plate 5C may be individually supported so as to rotate around the central axis O. In addition, although the structure of the other end of the cylindrical body 2C is not particularly shown, it may have the same structure as the one end, and the annular plate 7A (third restricting portion) and the annular spring 8A of the first embodiment may be provided.

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 sliding portion 4C and the concave portion 5f of the annular plate 5C, and the wire 3C enters the most radially inner side. From this state, the control device rotates the ring-shaped sliding portion 4C and the ring-shaped plate 5C in the same direction and at the same speed to rotate the groove-shaped space 6C in the same direction. The pin 3p of the wire 3C moves (slides) outward in the radial direction along the groove-shaped space 6C. If the pin 3p is located between the concave portion 44c of the annular sliding portion 4C and the convex portion 5e of the annular plate 5C, the mesh size on one end side becomes the largest, and the mesh size becomes different from one end side to the other end side. Also, from this state, if the ring-shaped sliding portion 4C and the ring-shaped plate 5C are rotated in the same direction, the groove-shaped space 6C also rotates in the same direction, and the pin 3p of the wire 3C is moved in the radial direction along the groove-shaped space 6C. Move (slide) inside, so the grid size will shrink.

[3-2. Structure (Figure 2)] Next, the structure in which the pattern 2 of the cylindrical body 2D is formed by the wire 3D configured to be immovable will be described. As shown in FIG. 9, the wire 3D of the grid screen device 1D is arranged parallel to each other in a cylindrical shape like the wire 3B of the second embodiment, and forms a cylindrical body 2D with a predetermined inner diameter. In addition, the cylindrical body 2D further includes a linear second wire 7D, which is respectively arranged between two adjacent wires 3D. In other words, the cylindrical body 3D is configured by alternately arranging two types of wires 3D and 7D in a cylindrical shape.

The second wire 7D, like the second wire 7B of the second embodiment, is formed in a cross-sectional shape or size that cannot be separated from the inner side of the cylindrical body 2D in the radial direction between two adjacent wires 3D. The cylinder is 3D and can be rotated around the central axis O. A pin 7p protruding in the axial direction is provided on an end surface in the axial direction of each second wire 7D. The pin 7p can be integrally formed with the second wire 7D, or can be installed. The cross-sectional shape orthogonal to the axial direction (projection direction) of the pin 7p becomes an oblong shape along the radial direction of the cylindrical body 2D.

The grid sieve device 1D, like the grid sieve device 1B of the second embodiment, has four restriction portions (a first restriction portion, a second restriction portion, a third restriction portion, and a fourth restriction portion), which restrict each wire 3D Each of one end and the other end moves toward each of the radially outer side and the radially inner side. In addition, the grid screen device 1D has: 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, the control devices 31 and 51 shown in FIG. 10) 9 Illustration omitted).

The first restricting portion is integrated with the second restricting portion in the same manner as in the second embodiment. It is a first fixing plate that keeps the distance between one end of two adjacent wires 3D at a predetermined interval and is fixed so as to be immovable (Figure Show omitted). In addition, the third restricting portion is also integrally provided with the fourth restricting portion in the same manner as in the second embodiment. It is the second that keeps the distance between the other ends of the two adjacent wires 3D at a predetermined interval and is fixed so as not to move. Fixed plate (not shown). The structures of the first fixing plate and the second fixing plate are the same as those of the first fixing plate 5B and the second fixing plate 6B of the second embodiment, so the description thereof is omitted. With the first fixing plate and the second fixing plate, the two ends of each wire 3D cannot be moved.

The ring-shaped sliding portion 4D and the ring-shaped plate 5D are configured in the same manner as the pattern 1 of the third embodiment. The ring-shaped sliding portion 4D is a ring-shaped plate member concentric with the central axis O, and the rotation is controlled by a control device. The shape of the inner side in the radial direction of the annular sliding portion 4D is formed by a plurality of convex portions 43d of the same shape protruding toward the central axis O and a plurality of concave portions 44d of the same shape recessed and arranged alternately and regularly in the circumferential direction. The shape (for example, the shape along the trochoid). The number of convex portions 43d is the same as the total number of wires 3D, and the ring-shaped sliding portion 4D has a function as an internal gear.

The ring-shaped plate 5D is arranged in the vicinity of one end of the cylindrical body 2D (specifically, the same axial position as the ring-shaped sliding portion 4D). The shape of the ring-shaped plate 5D on the outer side in the radial direction corresponds one-to-one to the shape of the ring-shaped sliding portion 4D on the inner side in the radial direction. The shape of the annular plate 5D of the present embodiment in the radial direction is such that a plurality of convex portions 5g of the same shape and a plurality of concave portions 5h of the same shape provided protruding outward in the radial direction are alternately and regularly arranged in the circumferential direction. A continuous shape (for example, a shape along a trochoid).

The ring-shaped sliding portion 4D and the ring-shaped plate 5D are arranged such that the radially inner end surface of the ring-shaped sliding portion 4D and the radially outer end surface of the ring-shaped plate 5D form a groove-shaped space 6D of the same width in the circumferential direction. Specifically, it is arranged such that the concave portion 5h of the ring-shaped plate 5D is located on the radially inner side of the convex portion 43d of the ring-shaped sliding portion 4D, and the convex portion 5g of the ring-shaped plate 5D is located on the concave portion 44d of the ring-shaped sliding portion 4d. Inward in the radial direction. The width (dimension in the radial direction) of the groove-shaped space 6D is set to be substantially the same as the length in the radial direction of the pin 7p. In the groove-shaped space 6D, one end portion (here, the pin 7p) of the second wire 7D is arranged so as to be slidable.

The upper diagram of FIG. 9 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 7p is located between the convex portion 43d of the ring-shaped sliding portion 4D and the concave portion 5h of the ring-shaped plate 5D, and becomes the second wire 7D to enter the innermost radial direction (between two adjacent wires 3D) )status. From this state, the control device rotates the ring-shaped sliding portion 4D and the ring-shaped plate 5D in the same direction to rotate the groove-shaped space 6D in the same direction. As shown in the lower diagram of FIG. 9, the second wire The pin 7p of 7D moves (slides) outward in the radial direction along the groove-shaped space 6C.

If the pin 7p is located between the concave portion 44d of the annular sliding portion 4D and the convex portion 5g of the annular plate 5D, the mesh size on one end side becomes the largest, and the mesh size becomes different on one end side and the other end side. Also, from this state, if the annular sliding portion 4D and the annular plate 5D are rotated in the same direction, the groove-shaped space 6D also rotates in the same direction, and the pin 7p of the second wire 7D is moved along the groove-shaped space 6D. Move (slide) in the radial direction, so the grid size will be reduced.

[3-3. Effect] According to the grid screen devices 1C, 1D of the above-mentioned pattern 1 and pattern 2, the mesh size can be changed by rotating the ring-shaped sliding parts 4C, 4D and the ring-shaped plates 5C, 5D in the same direction and at the same speed. Therefore, the grid size in the longitudinal direction of each grid screen device 1C, 1D can be made different with a small power cost, and a single grid screen device 1C, 1D can be used to perform multi-stage solid-liquid separation or classification. Furthermore, according to the grid screen devices 1C and 1D, the ring-shaped sliding parts 4C and 4D provided integrally with the first restricting part may be a single member, and the cost can be reduced.

Moreover, when the shape of the inner side of the ring-shaped sliding parts 4C, 4D in the radial direction is a shape along the trochoid, it can be accompanied by the movement of the concave and convex shapes along the trochoid (with the change in the action of the gear) Quantities) to smoothly change the mesh size formed between adjacent wires 3C and 3D.

[3-4. Modifications] Each structure of the above-mentioned figure 1 and figure 2 is an example. For example, the aforementioned grid screen devices 1C and 1D may further have end plates 8C and 8D provided with guide holes 8e and 8f for guiding the movement of the aforementioned pins 3p and 7p in the radial direction. The structure of the case where the end plates 8C and 8D are provided is partially enlarged and shown in Fig. 8 and Fig. 9 where the part surrounded by a single-dot chain line. In addition, the end plate 8C and the end plate 8D may not have the same structure, but for convenience, the two are combined and described here.

Each end plate 8C, 8D is a plate-shaped member arranged near one end of each cylindrical body 2C, 2D. The end plates 8C, 8D may have, for example, a circular ring shape, or a circular shape that plugs the opening on one end side of the cylindrical body 2C, 2D. When the end plates 8C and 8D are annular, their positions may be set, for example, between the end surface on one end side of each of the wires 3C and 7D and the annular sliding portions 4C and 4D and the annular plates 5C and 5D. On the other hand, when the end plates 8C and 8D have a circular shape that closes the opening, they may be arranged on one end side of the ring-shaped sliding portions 4C, 4D and the ring-shaped plates 5C, 5D.

The guide hole 8e is formed in the end plate 8C corresponding to the position of each wire 3C, and is a recess or a through hole of a predetermined length extending radially from the central axis O of the cylindrical body 2C. The control device rotates the ring-shaped sliding portion 4C to thereby move one end of the wire 3C along the corresponding guide hole 8e. According to the grid screen device 1C configured in this way, each wire 3C can be moved stably.

The guide hole 8f is formed in the end plate 8D corresponding to the position of each second wire 7D, and is a recess or a through hole of a predetermined length extending radially from the central axis O of the cylindrical body 2D. The control device rotates the ring-shaped sliding portion 4D to thereby move one end of the second wire 3D along the corresponding guide hole 8f. According to the grid screen device 1D configured in this way, each second wire 3D can be stably moved. In addition, when the end plates 8C and 8D have a circular shape that plugs the opening, the guide holes 8e and 8f are preferably provided as recesses (not penetrating) from the viewpoint of avoiding leakage of the object to be processed.

The above-mentioned pins 3p and 7p are not necessary and can be omitted. In this case, it is only necessary to arrange the end of one end side of the wire 3C or the second wire 7D so as to be slidable in the groove-shaped spaces 6C and 6D, and the wire 3C or the second wire can be rotated in accordance with the rotation of the groove-shaped spaces 6C and 6D. The end on one end side of 7D may be moved in the radial direction.

The shape of each wire 3C, 3D of the above-mentioned grid screen device 1C, 1D may be changed to the shape of the wire described in each modification of the first embodiment and the second embodiment. In addition, the shape of the radially inner side of the ring-shaped sliding parts 4C, 4D is an example, and it is not limited to the shape along the trochoid, as long as it is the shape of the ring-shaped sliding parts 4C, 4D on the radially outer side of the ring-shaped plates 4D, 5D. One-to-one corresponding shape is sufficient.

[4. Application example] Next, a water treatment system to which the aforementioned grid screen devices 1A to 1D are applied will be described as an application example. In the following application examples, any of the above-mentioned grid sieve devices 1A to 1D can be used. Therefore, in the following description, the grid sieve devices 1A~1D are collectively referred to as "grid sieve device 1". Similarly, the cylindrical bodies 2A~2D of each grid sieve device 1A~1D are labeled as "cylinders". Body 2", mark the wires 3A to 3D as "wire 3", and mark the ring-shaped sliding parts 4A to 4D as "ring-shaped sliding part 4".

[4-1. Water treatment system] Figures 10 and 11 are diagrams for explaining water treatment systems 10, 10' to which the above-mentioned grid screen device 1 is applied. The water treatment systems 10, 10' are systems that treat sludge, excrement, or a mixture of sludge and excrement as treatment objects, and concentrate and dehydrate the treatment objects. The water treatment system 10 in FIG. 10 is a dewatering treatment system for sewage sludge, and the water treatment system 10' in FIG. 11 is an excrement treatment system.

The water treatment system 10, 10' has: mixing tanks 20, 20', which supply at least one of a dehydration aid, a metal removal chemical, and a flocculant to the treatment object, mix and agglomerate; a concentration system 30, which is suitable for the above-mentioned grid The sieve device 1; and the dehydration system 50, which is applicable to the grid sieve device 1 described above. The concentration system 30 is an example of a water treatment system in which the liquid stored in the mixing tank 20 is introduced into the inside as the liquid to be treated. In addition, 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 inside as a to-be-processed object.

10, in addition to the thickening system 30, the structure of the thickening system having the thickening device 80 that is not the conventional grid sieve device (the grid size is fixed) other than the above-mentioned grid sieve device 1 is shown by a dotted line. The thickening device 80 is a device that receives the liquid stored in the mixing tank 20 and discharges the concentrated sludge after the liquid is concentrated. Usually, the concentration system and the dewatering system are bidding individually, so the grid screen device 1 may not be introduced in the two systems. Therefore, at least the grid sieve device 1 is introduced into the dewatering system, and the case where the grid sieve device 1 is introduced into the concentration system (concentration system 30) and the case where the grid sieve device 1 is not introduced (system using the concentration device 80) will be compared and described.

As shown in FIG. 10, the mixing tank 20 contains: a medicine mixing tank 24 for mixing the treatment target (for example, sludge) with the metal removing medicine supplied from the medicine supply device 25; and a condensing agent mixing tank 27, which The liquid supplied from the medicine mixing tank 24 and the condensing agent supplied from the condensing agent supply device 28 are mixed and condensed. Each of these mixing tanks 24 and 27 is provided with stirring devices 26 and 29 for stirring the internal liquid.

The liquid to be treated mixed in the mixing tank 20 is supplied to the sieve device 1 or the concentration device 80 of the concentration system 30. As mentioned above, generally in a system using the concentration system 30 and the concentration device 80, only one of the concentration systems is installed, so corresponding to the installed concentration system, the liquid to be treated is only supplied to the grid of the concentration system 30 One of the device 1 and the concentration device 80. When the liquid to be treated is supplied to the concentration system 30, the concentration system 30 causes the control device 31 to perform feedback control based on the measurement result of the concentration measuring device 32 (described later), thereby changing the grid of the grid sieve device 1, and , The drive device 33 is controlled to rotate the cylindrical body 2 (described later). Thereby, the liquid to be treated is separated into solid and liquid in multiple stages, and the concentrated sludge (object to be treated) and the concentrated separated liquid are discharged. The discharged concentrated sludge (processed object) is supplied to the dewatering system 50. Here, the concentrated sludge (object to be processed) is liquid. In addition, the detailed structure of the enrichment system 30 will be described later.

On the other hand, when the liquid to be processed is supplied to the concentrating device 80, the liquid to be processed in the concentrating device 80 is separated into solid and liquid, but since the mesh size is fixed, feedback control like the thickening system 30 cannot be performed. Therefore, the thickening device 80 cannot respond to changes in the properties of the treatment target or the liquid to be treated, and the properties of the concentrated sludge separated in the thickening device 80 are difficult to stabilize to the desired properties. The concentrated sludge is stored in the storage tank 81, and then is supplied to the dehydration mixing tank 82. However, it may have undesirable properties. Therefore, it is necessary to use the medicine supply device 83 in the dehydration mixing tank 82. At least one of the supplied metal removal chemical and the condensation agent supplied by the condensation agent supply device 84 is again mixed with the concentrated sludge to make the concentrated sludge have the desired properties. That is, in the above-mentioned water treatment system employing the concentration system using the concentration device 80, it is necessary to supply a chemical or a condensing agent to the mixing tank 20 and the mixing tank 82 for dehydration. Therefore, compared with the above-mentioned water treatment system using the concentration system 30 using the grid screen device 1, not only the installation cost of the storage tank 81 and the dehydration mixing tank 82, but also the cost of the medicine or the condensing agent are considered. It is also unavoidable to increase costs. Conversely, the above-mentioned water treatment system 10 using the concentration system 30 using the grid screen device 1 is compared with the above-mentioned water treatment system using the concentration system using the thickening device 80 in terms of installation cost and operating cost. For excellent. In addition, the concentrated sludge (object to be processed) discharged from the mixing tank 82 for dehydration is supplied to the dehydration system 50.

The concentrated sludge which is a to-be-processed object is supplied to the screen device 1 of the dewatering system 50. The dehydration system 50 makes the control device 51 feedback control (described later) based on the measurement result of the moisture content measuring device 52, thereby changing the grid of the grid screen 1, and controlling the driving device 53 (such as an electric motor) by the feedback control Wait). 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 the dewatered sludge whose moisture has been dewatered. The detailed structure of the dehydration system 50 will be described later.

The water treatment system 10' shown in FIG. 11 includes a dehydration aid mixing tank 21 in the mixing tank 20' that mixes the processing object (for example, excrement) with the dehydration aid supplied by the dehydration aid supply device 22, It is different from the water treatment system 10 of FIG. 10. The dehydration aid mixing tank 21 is provided with a stirring device 23 for stirring the internal liquid. In the water treatment system 10 ′ of FIG. 11, the liquid mixed in the dehydration aid mixing tank 21 is supplied to the medicine mixing tank 24. The subsequent process is the same as that of the water treatment system 10 of FIG. 10, so the description thereof is omitted. In addition, although illustration is omitted in FIG. 11, the water treatment system 10' in FIG.

[4-2. Concentration system] FIG. 12 is a diagram illustrating the concentration system 30. As shown in FIG. The concentration system 30 has: a grid sieve device 1, which makes the central axis O of the cylindrical body 2 substantially horizontally arranged; a driving device 33 (such as an electric motor, etc.), which makes the cylindrical body 2 rotate around the central axis O; The introduction pipe 34, which supplies the liquid to be treated from the other end of the grid sieve device 1 (the right end in FIG. 12) to the inside of the cylindrical body 2; and the concentration measuring device 32, which measures from one end of the grid sieve device 1 (Figure 12 The left end in 12) the concentration of the concentrated sludge discharged. In addition, in FIG. 12, the illustration of the rotating mechanism which rotates the ring-shaped sliding part 4 of the grid screen apparatus 1 is abbreviate|omitted.

The grid sieve device 1 is arranged in a housing 35, the concentrated separated liquid is discharged from a separated liquid discharge pipe 38 provided at the lower part of the housing 35, and the concentrated sludge is discharged from an opening 37 on one end side of the housing 35. The other end of the cylindrical body 2 is fixed to a pillar or wall plate 36 for rotating the cylindrical body 2 by a driving device 33. The operation of the driving device 33 is controlled by the control device 31. The driving device 33 may rotate the cylindrical body 2 constantly or intermittently. In the case of intermittent rotation, the cylindrical body 2 may be rotated halfway in a single direction, or may be rotated forward and backward (reciprocating).

The control device 31 changes the mesh size according to the feedback control of the concentration of the concentrated sludge output by the concentration measuring device 32. For example, when the concentration of the concentrated sludge is lower than the predetermined first threshold value (if the moisture content is high), the control device 31 determines that the grid size of the current situation is smaller and enlarges the grid size. Conversely, when the concentration of the concentrated sludge is higher than the first threshold (if the moisture content is low), the grid for judging the current situation is larger, and the grid size is reduced. As described above, the control device 31 applies feedback based on the measurement result of the concentration measuring device 32 to change the mesh size. In addition, the control device 31 may instead of using the first threshold value, but when the concentration of the concentrated sludge is lower, the size of the grid is enlarged, and when the concentration of the concentrated sludge is higher, the size of the grid is reduced.

In addition, the control device 31 may also control the driving device 33 in feedback to change the rotation speed of the cylindrical body 2 in accordance with the concentration of the concentrated sludge output by the concentration measuring device 32. For example, if the concentration is lower than the predetermined second threshold value, the rotation speed may be increased (if the water content is higher), and the rotation speed may be decreased if the concentration is higher than the second threshold value (if the water content is lower). In addition, the control device 31 may replace the use of the second threshold, and the lower the concentration, the higher the rotation speed, and the higher the concentration, the lower the rotation speed.

According to the above-mentioned concentration system 30, since the above-mentioned grid sieve device 1 is applied, the grid size can be made different in the length direction of the grid sieve device 1. Specifically, the size of the mesh on the side of the introduction pipe 34 is reduced, and the size of the mesh on the side of the opening 37 is increased, so that the liquid to be processed introduced into the cylindrical body 2 can be transported to the side of the opening 37. Concentrate appropriately on one side. In addition, when the mesh on the opening 37 side is made larger, the difference in mesh size between the inlet pipe 34 side and the opening 37 side is preferably about 3 mm at the maximum, for example.

[4-3. Dehydration system] FIG. 13 is a diagram illustrating the dehydration system 50. As shown in FIG. The dewatering system 50 has: a grid screen device 1 which makes the central axis O of the cylindrical body 2 substantially horizontally arranged; an introduction pipe 54 which faces the cylindrical body 2 from one end (the left end in FIG. 13) of the grid screen device 1 The inside of the supply to be processed; the screw shaft 56, which is arranged inside the cylindrical body 2 and on the central axis O of the cylindrical body 2, conveys the processed object from one end to the other end (the right end in Figure 13); And a moisture content measuring device 52, which measures the moisture content of the dewatered sludge discharged from the other end. In addition, in FIG. 13, the illustration of the rotating mechanism which rotates the ring-shaped sliding part 4 of the grid screen apparatus 1 is abbreviate|omitted. In addition, in FIG. 13, for convenience, the three control units (rotation control unit 51x, back pressure control unit 51y, and mesh control unit 51z) provided in the control device 51 are shown separately.

The grid screen device 1 is arranged in a casing 55, the dehydrated separated liquid is discharged from a separated liquid discharge pipe 60 provided at the lower part of the casing 55, and the dehydrated sludge is discharged from a discharge hole 61a on the other end side of the casing 55. A blocking plate 58 that plugs the opening is fixed to one end of the cylindrical body 2, and a back pressure plate 59 is provided on 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 be used for 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 the back pressure plate 59 and the other end of the cylindrical body 2 form a discharge hole 61 a. The dewatered sludge discharged from the discharge hole 61a is discharged through the dewatered sludge discharge pipe 61.

The introduction pipe 54 is located on the central axis O and penetrates the blocking plate 58, and opens inside the cylindrical body 2. The opening (introduction hole 54a) of the introduction pipe 54 is arranged at the same axial position as the annular sliding portion 4, for example. The screw shaft 56 is coaxial with the introduction tube 54 and is arranged in a double tube structure inside the introduction tube 54. The screw shaft 56 is provided with screw blades 57 having a length reaching the vicinity of the inner circumference of the cylindrical body 2.

The control device 51 is provided with: a rotation control unit 51x, which controls the rotation of the screw shaft 56 and the cylindrical body 2, respectively; a back pressure control unit 51y, which controls the pressing force against the back pressure plate 59; and a mesh control unit 51z, It controls the grid size of the grid screen device 1.

The rotation control unit 51x controls the drive device 53 (omitted in FIG. 13) to rotate the screw shaft 56 and the cylindrical body 2 at an individual rotation speed, and supplies the inlet hole 54a to the end side of the cylindrical body 2. The processed material is conveyed to the other end while being squeezed, and the dehydrated sludge is discharged from the discharge hole 61a on the other end side. The rotation control unit 51x responds to the moisture content of the dewatered sludge output by the moisture content measuring device 52 provided in the dewatered sludge discharge pipe 61, and controls the torque of the drive screw shaft 56 and the cylinder 2 back and forth. The torque may be detected by, for example, a load sensor (not shown). When the drive device 53 is an electric motor controlled by an inverter, it may be detected by measuring the inverter current value.

The rotation control unit 51x, for example, makes the torque larger than the current torque if the water content is higher than the predetermined third threshold value, and makes the torque smaller than the current torque if the water content is lower than the third threshold value. In addition, the rotation control unit 51x may instead use the third threshold, and the higher the water content, the greater the torque, and the lower the water content, the smaller the torque.

The back pressure control unit 51y controls the position of the back pressure plate 59 according to the moisture content of the dehydrated sludge output by the moisture content measuring device 52 to adjust the pressing force (back pressure). The back pressure control unit 51y, for example, makes the pressing force higher than the current pressing force if the water content is higher than the predetermined fourth threshold value, and makes the pressing force higher than the current pressing force if the water content is lower than the fourth threshold value. The pressure is still low. In addition, the back pressure control unit 51y may replace the use of the fourth threshold, and when the water content is higher, the pressing force is increased, and when the water content is lower, the pressing force is lowered.

The mesh control unit 51z changes the mesh size according to the feedback control of the moisture content of the dewatered sludge output from the moisture content measuring device 52. For example, if the moisture content is higher than the predetermined fifth threshold value, the mesh control unit 51z judges that the mesh of the current situation is smaller, and enlarges the mesh size. Conversely, if the water content is lower than the fifth threshold, the grid for judging the current situation is larger, and the grid size is reduced. In addition, the mesh control unit 51z may replace the use of the fifth threshold, but the higher the water content, the more the mesh size is, and the lower the water content, the smaller the mesh size.

The third threshold, the fourth threshold, and the fifth threshold may all have the same value or different values. As described above, the control device 51 applies feedback based on the result measured by the water content measuring device 52, and changes the torque, pressing force, and mesh size, respectively. In addition, the water content measured by the water content measuring device 52 is a case where the concentration measured by the concentration measuring device is expressed as a percentage [%], and can be expressed as "water content [%]=100-concentration". That is, the concentration measuring device 32 can be used as the water content measuring device 52 of FIG. 13.

According to the dewatering system 50, since the grid screen device 1 is applied, the grid size can be different in the length direction of the grid screen device 1. Specifically, by increasing the size of the mesh on the side of the introduction pipe 54 and decreasing the size of the mesh on the side of the discharge hole 61a, the dewatered sludge squeezed inside the cylindrical body 2 can be moved toward the discharge hole. The 61a side is transported and dehydrated properly. In addition, when the mesh on the side of the introduction pipe 54 is made larger, the difference in the size of the mesh on the side of the introduction pipe 54 and the side of the discharge hole 61a is preferably about 0.1 to 2 mm at the maximum, for example.

[4-4. Effect of water treatment system] According to the water treatment systems 10, 10' having the above-mentioned concentration device 80 and the dehydration system 50, since the above-mentioned grid screen device 1 is applied to at least the dehydration system 50, the grid size can be different in the length direction of the grid screen device 1. Therefore, it is easy to use one grid screen device 1 to achieve the target processing capacity, and the cost of the entire system can be suppressed.

And, as shown in FIG. 10, according to the water treatment system 10 in which the above-mentioned grid sieve device 1 is applied to both the concentration system 30 and the dehydration system 50, not only the dehydration system 50, but also the concentration system 30 can also be used in the grid sieve device 1. The length direction makes the grid size different. In this case, since the device shown by the dotted line in FIG. 10 is not required, it is also excellent from the viewpoint of the system architecture, and the cost of the entire system can be further suppressed.

[4-5. Modifications] The aforementioned water treatment systems 10, 10', concentration system 30, and dehydration system 50 are all examples. For example, a moisture content measuring device may be used in the concentration system 30, and a concentration measuring device may be used in the dehydration system 50.

1, 1A, 1B, 1C, 1D: grid screen device 2, 2A, 2B, 2C, 2D: cylinder 2g: recess 3, 3A, 3B, 3C, 3D: wire 3p: pin 4, 4A, 4C: Ring-shaped sliding part (first restricting part) 4, 4B, 4D: Ring sliding part 5A: Ring spring (second restricting part) 5B: The first fixing plate (the first restricting part, the second restricting part) 5C: Ring plate (second restricting part) 5D: ring version 5e, 5g: convex part 5f, 5h: recess 5j: Fitting part 6A: Cover member (ring plate) 6B: The second fixing plate (the third restricting part, the fourth restricting part) 6C, 6D: groove-like space 7A: Ring plate (third restricting part, ring-shaped plate member) 7B, 7D: second wire 7p: pin 8A: Ring spring (fourth restricting part) 8C, 8D: end plate 8e, 8f: guide hole 10, 10′: water treatment system 20, 20′: mixing tank 21: Dehydration aid mixing tank 22: Dehydration aid 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 34: Introductory tube 35: shell 36: Pillar or siding 37: opening 38: Separation liquid discharge pipe 41A, 41B, 42A, 42B: ring sliding plate 43a, 43b, 43c, 43d: convex part 44a, 44b, 44c, 44d: recess 50: Dehydration system 51: control device 51x: Rotation control section 51y: Back pressure control unit 51z: Grid Control Department 52: Water content measuring device (concentration measuring device) 53: drive device 54: Introductory tube 54a: lead-in hole 55: Shell 56: Screw shaft 57: Screw blade 58: occlusion plate 59: Back pressure plate 60: Separation liquid discharge pipe 61: Dewatered sludge discharge pipe 61a: discharge hole 80: Concentration device (concentration device in the past, the grid size is fixed) 81: storage tank 82: Mixing tank for dehydration 83: Medicine supply device 84: Condensing agent supply device 91A, 92A: Ring-shaped sliding plate (third restricting part, ring-shaped plate member) 91B, 92B: ring sliding plate O: Central axis

[Fig. 1] A partially exploded perspective view showing the grid screen device of the first embodiment. [Fig. 2] A side view of the grid screen device shown in Fig. 1 viewed from one end side. [Fig. 3] A diagram for explaining the operation of the grid sieve device shown in Fig. 1 (an enlarged view of the part X in Fig. 2). [Fig. 4] A partially exploded perspective view showing the grid screen device of the second embodiment. [Fig. 5] A side view of the cylindrical body of the grid screen device shown in Fig. 4 viewed from one end side. [Fig. 6] A diagram for explaining the operation of the grid screen device shown in Fig. 4 (an enlarged view of the Y section in Fig. 5). [Fig. 7] A table showing a combination of a wire rod forming a cylindrical body and a second wire rod in a modification of the second embodiment. [Fig. 8] A part of the side view of the grid screen device of Figure 1 of the third embodiment viewed from one end side. [Fig. 9] A part of the side view of the grid screen device of Figure 2 of the third embodiment viewed from one end side. [Fig. 10] A diagram showing an example of a water treatment system according to an embodiment. [Fig. 11] A diagram showing an example of a water treatment system of another embodiment. [Fig. 12] A diagram explaining the concentration system of the embodiment. [Fig. 13] A diagram explaining the dehydration system of the embodiment.

1A: Grid sieve device

2A: Cylinder

2g: recess

3A: Wire

4A: Ring-shaped sliding part (first restricting part)

5A: Ring spring (second restricting part)

6A: Cover member (ring plate)

7A: Ring plate (third restricting part, ring-shaped plate member)

8A: Ring spring (fourth restricting part)

41A, 42A: Ring sliding plate

43a: Convex

44a: recess

91A, 92A: Ring-shaped sliding plate (third restricting part, ring-shaped plate member)

Claims (13)

A grid sieve device having: A cylindrical body with a predetermined inner diameter, which is formed by arranging a plurality of parallel linear wires into a cylindrical shape; The first restricting portion restricts the movement of one end of each of the aforementioned wires to the outside in the radial direction of the aforementioned cylindrical body; The second restricting portion restricts the movement of the one end of the aforementioned wire to the inner side of the diameter direction of the aforementioned cylindrical body; The third restricting portion restricts the movement of the other end of each of the aforementioned wires to the outside in the radial direction of the aforementioned cylindrical body; The fourth restricting portion restricts the movement of the other end of each wire to the inner side of the cylindrical body in the radial direction; An annular sliding part which is concentric with the central axis of the cylindrical body and is arranged near the one end of the cylindrical body; and A control device that rotates the ring-shaped sliding portion around the center axis, The shape of the annular sliding portion on the inner side in the radial direction 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 provided as recesses are alternately and regularly continuous in the circumferential direction , The number of the protrusions is the same as the number of the wires. The control device rotates the annular sliding portion while maintaining the predetermined inner diameter of the cylindrical body at the other end by the third restricting portion and the fourth restricting portion, thereby enabling adjacent The size of the grid on the one end side formed between the two aforementioned wires is enlarged to be larger than the size of the grid on the other end side formed between the two adjacent wires on the other end. The grid sieve device according to claim 1, wherein: The ring-shaped sliding part is provided integrally with the first restricting part, and is provided with two ring-shaped sliding plates arranged on the outer circumference of the cylindrical body and having the same shape as each other, The third restricting portion is an annular plate member arranged on the outer periphery of the cylindrical body, The second restricting portion and the fourth restricting portion are both ring springs that press the wire to the outside in the radial direction of the cylindrical body. The control device rotates the two ring-shaped sliding plates in opposite directions to each other, thereby forming a depression with the recesses of the two ring-shaped sliding plates, and the wire is caused by the pressing force caused by the second restricting portion. Moving toward the outer side in the radial direction toward the recess, the mesh size on the one end side is enlarged. The grid sieve device according to claim 1, wherein: The cylindrical body further includes a linear second wire, which is respectively arranged between the two adjacent wires and is rotatable around the central axis, The ring-shaped sliding portion includes two ring-shaped sliding plates arranged on the outer circumference of the cylindrical body and having the same shape as each other, The first restricting portion is integrally provided with the second restricting portion, and is a first fixing plate that keeps the distance between the one ends of the two adjacent wires at a predetermined interval and is fixed so as to be immovable, The third restricting portion is integrally provided with the fourth restricting portion, and is a second fixing plate that maintains the interval between the other ends of the two adjacent wires at the predetermined interval and is fixed so as to be immovable, The second wire is formed in a cross-sectional shape or size that cannot be separated toward the inner side of the cylindrical body in the radial direction between the two adjacent wires. The control device rotates the two ring-shaped sliding plates in opposite directions to each other, thereby forming a depression with the recesses of the two ring-shaped sliding plates, and using gravity or centrifugal force to move the second wire toward the depression It moves outward in the direction, and the size of the grid on the one end side is enlarged. The grid sieve device according to claim 1, wherein: The aforementioned ring-shaped sliding portion is integrated with the aforementioned first restricting portion, The aforementioned second restricting portion is an annular plate concentric with the aforementioned central axis, The shape of the ring-shaped plate on the outer side in the radial direction corresponds one-to-one to the shape of the ring-shaped sliding portion on the inner side in the radial direction. The ring-shaped sliding portion and the ring-shaped plate are arranged such that the radially inner end surface of the ring-shaped sliding portion and the radially outer end surface of the ring-shaped plate form a groove-shaped space with the same width in the circumferential direction, The control device rotates the ring-shaped sliding portion and the ring-shaped plate at the same speed and in the same direction to move the wire along the groove-shaped space to change the mesh size on the one end side. The grid sieve device according to claim 1, wherein: It further has an annular plate concentric with the central axis, which is arranged near the one end of the cylindrical body, The cylindrical body further includes a linear second wire, which is respectively arranged between two adjacent wires, The first restricting portion is integrally provided with the second restricting portion, and is a first fixing plate that keeps the distance between the one ends of the two adjacent wires at a predetermined interval and is fixed so as to be immovable, The third restricting portion is integrated with the fourth restricting portion, and is a second fixing plate that maintains the interval between the other ends of the two adjacent wires at the predetermined interval and is fixed so as to be immovable, The second wire is formed in a cross-sectional shape or size that cannot be separated toward the inner side of the cylindrical body in the radial direction between the two adjacent wires. The shape of the ring-shaped plate on the outer side in the radial direction corresponds one-to-one to the shape of the ring-shaped sliding portion on the inner side in the radial direction. The ring-shaped sliding portion and the ring-shaped plate are arranged such that the radially inner end surface of the ring-shaped sliding portion and the radially outer end surface of the ring-shaped plate form a groove-shaped space with the same width in the circumferential direction, The control device rotates the ring-shaped sliding portion and the ring-shaped plate at the same speed and the same direction to move the second wire along the groove-shaped space to change the mesh size on the one end side. The grid sieve device according to any one of claim 2 and claim 4, wherein: It further has an end plate, which is arranged near the one end of the cylindrical body, The end plate is provided with a guide hole of a predetermined length, which is formed corresponding to the position of each wire and extends radially from the central axis of the cylindrical body, The control device rotates the annular sliding portion to thereby move the one end of the wire along the corresponding guide hole. The grid sieve device according to any one of claim 3 and claim 5, wherein: It further has an end plate, which is arranged near the one end of the cylindrical body, The end plate is provided with a guide hole of a predetermined length, which is formed corresponding to the position of each of the second wires and extends radially from the central axis of the cylindrical body, The control device rotates the annular sliding portion to thereby move the second wire along the corresponding guide hole. The grid screen device according to any one of claims 1 to 5, wherein the shape of the inner side in the radial direction of the ring-shaped sliding portion is a shape along a trochoid. A concentration system with: The grid sieve device according to any one of claim 1 to claim 8, which arranges the aforementioned central axis substantially horizontally; A driving device that rotates the cylindrical body of the grid screen device around the central axis; An introduction pipe that supplies the liquid to be treated from the other end of the grid screen device to the inside of the cylindrical body; and A concentration measuring device, which measures the concentration of the concentrated sludge discharged from the aforementioned end of the aforementioned grid sieve device, The control device of the grid sieve device changes the size of the grid in response to the concentration output by the concentration measuring device. A dehydration system with: The grid sieve device according to any one of claim 1 to claim 8, which arranges the aforementioned central axis substantially horizontally; An introduction pipe, which supplies the processed object to the inside of the cylindrical body from the one end of the grid screen device; A screw shaft, which is arranged inside the cylindrical body and on the central axis, conveys the object to be processed from the one end to the other end; A moisture content measuring device, which measures the moisture content of the dewatered sludge discharged from the other end, The control device of the grid sieve device changes the size of the grid in response to the moisture content output by the moisture content measuring device. A water treatment system takes sludge, excrement, or a mixture of sludge and excrement as the treatment object, and concentrates and dehydrates the aforementioned treatment object, which has: A mixing tank, which supplies at least one of a dehydration aid, a metal removal agent, and a flocculant to the aforementioned treatment object, and mixes and agglomerates; A thickening device that receives the liquid stored in the aforementioned mixing tank, and discharges the concentrated sludge after concentrating the aforementioned liquid; and The dewatering system according to claim 10, wherein the concentrated sludge is introduced into the cylindrical body as the to-be-processed object. A water treatment system takes sludge, excrement, or a mixture of sludge and excrement as the treatment object, and concentrates and dehydrates the aforementioned treatment object, which has: A mixing tank, which supplies at least one of a dehydration aid, a metal removal agent, and a flocculant to the aforementioned treatment object, and mixes and agglomerates; A thickening device, which receives the liquid stored in the aforementioned mixing tank, and discharges the concentrated sludge after concentrating the aforementioned liquid; A mixing tank for dehydration, which receives the aforementioned concentrated sludge and mixes at least one of the metal removal chemical and the aggregating agent; and The dehydration system according to claim 10, which introduces the liquid stored in the mixing tank for dehydration into the interior of the cylindrical body as the to-be-processed object. A water treatment system takes sludge, excrement, or a mixture of sludge and excrement as the treatment object, and concentrates and dehydrates the aforementioned treatment object, which has: A mixing tank, which supplies at least one of a dehydration aid, a metal removal chemical, and a flocculant to the aforementioned treatment object, and mixes and agglomerates; The concentration system according to claim 9, which introduces the liquid stored in the mixing tank into the inside as the liquid to be treated; and The dewatering system according to claim 10, which introduces the concentrated sludge discharged from the thickening system into the inside as the to-be-processed material.

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