KR20220132661A - Screen unit, thickening system and dewatering system and water treatment system - Google Patents

Abstract

A cylindrical body 2A of a predetermined inner diameter made of a plurality of wire rods 3A, and one end and the other end of each wire rod 3A four restrictions restricting movement of each of the radially outer and inner sides of the cylindrical body 2A A screen device (1) having a portion, an annular slide portion (4A) disposed at one end of a cylindrical body (2A), and a control device for rotating the annular slide portion (4A) around a central axis (O). The inner side of the annular slide portion 4A has a shape in which the convex portions 43a and the concave portions 44a protruding and concave toward the central axis O side are alternately and regularly connected. The control device rotates the annular slide part 4A in a state where the predetermined inner diameter of the outer end of the cylindrical body 2A is maintained, thereby determining the size of the mesh on the one end side formed between the two adjacent wire rods 3A, The size of the mesh on the other end side formed between the two adjacent wire rods 3A at the other end can be enlarged.

Description

Screen unit, thickening system and dewatering system and water treatment system

The present invention relates to a screen device, a concentration system having the screen device, a dewatering system having the screen device, and a water treatment system having at least this dehydration system.

In a screen device used for various purposes, such as solid-liquid separation and classification, the passage of a substance larger than a predetermined size contained in the object to be treated is prevented, and a substance smaller than the predetermined size is passed, or a predetermined amount of A mesh (a gap formed between adjacent wire rods) through which the processed material passes is formed. In such a screen device, not only a device in which the mesh size is fixed, but also a device in which the mesh size is variable has been developed.

For example, Patent Document 1 discloses a device that includes a fixed-side sieve member and a movable-side sieve member slidable with respect to the fixed-side sieve member, and can change the size of a mesh by sliding the movable-side sieve member. have.

Further, Patent Document 2 discloses an apparatus capable of increasing the spacing between adjacent wire rods, ie, changing the mesh size, by stretching a coil spring wound spirally around the wire rod.

Japanese Patent Laid-Open No. 10-235293 Japanese Patent Publication No. 6458962

However, in the screen devices disclosed in Patent Documents 1 and 2 described above, although the size of the mesh can be changed, the mesh is set to have the same size at any point in the longitudinal direction of the screen device. For this reason, for example, in the case of solid-liquid separation or classification in multiple steps, depending on the application, the target processing capacity cannot be obtained with only one screen device. In such a case, it is necessary to arrange a plurality of screen devices having different mesh sizes, which may increase the overall cost of the system.

The present invention was devised in view of the above problems, and is a screen device capable of varying the mesh size in the longitudinal direction of the screen device, and a concentration system and a dewatering system using the screen device for treatment of sludge, manure, etc. And it aims to provide a water treatment system.

The screen device of the present invention provides a cylindrical body having a predetermined inner diameter formed by arranging a plurality of linear wire rods parallel to each other in a cylindrical shape, and a first end of each wire member restricting movement of the outside in the radial direction of the cylindrical body. A first limiting part, a second limiting part limiting movement of the one end of each wire in the radial direction of the cylindrical body, and limiting the other end of each wire from moving outward in the radial direction of the cylindrical body a third limiting part; a fourth limiting part limiting movement of the other end of each wire rod inward in the radial direction of the cylindrical body; It has an annular slide part concentric with and a control device for rotating the annular slide part about the central axis. The radially inner shape of the annular slide portion is a shape in which a plurality of convex portions of the same shape protruded toward the central axis and a plurality of concave portions of the same shape formed concavely are alternately and regularly connected in a circumferential direction, and the number of the convex portions is equal to the number of the wire rods. The control device is configured to rotate the annular slide part in a state where the predetermined inner diameter of the cylindrical body is maintained at the other end by the third limiting part and the fourth limiting part, so that a space between the adjacent two wire rods is provided. It is characterized in that the size of the mesh formed on the one end side can be enlarged than the size of the mesh on the other end side formed between the two adjacent wire rods at the other end.

The thickening system of the present invention comprises: a screen device of the present invention in which a central axis of the cylindrical body is arranged substantially horizontally; a driving device for rotating the cylindrical body of the screen device around the central axis; an inlet pipe for supplying the liquid to be treated into the cylindrical body from the other end, and a concentration measuring device for measuring the concentration of concentrated sludge discharged from the one end of the screen device; It is characterized in that the size of the mesh is changed according to the density output by the measuring device.

The dewatering system of the present invention comprises: the screen device of the present invention in which the central axis of the cylindrical body is arranged substantially horizontally; a screw shaft disposed inside the cylindrical body and disposed on the central axis for conveying the object to be treated from the one end to the other end, and a moisture content measuring device for measuring the moisture content of the dehydrated sludge discharged from the other end, the screen; The control device of the device is characterized in that the size of the mesh is changed according to the moisture content output by the moisture content meter.

The water treatment system of the present invention is a water treatment system for treating sludge, excreta, or a mixture of sludge and excreta, and concentrating and dehydrating the treatment target, wherein the treatment target includes a dehydration aid, a metal removal agent, and a coagulant. A mixing tank in which at least one is supplied and mixed and aggregated, the concentration system of the present invention for introducing the liquid stored in the mixing tank into the inside as the target liquid, and the concentrated sludge discharged by the concentration system as the target object It is characterized in that it has the dehydration system of the present invention introduced therein.

According to the screen device of the present invention, since the mesh size can be different in the longitudinal direction of the screen device, multi-stage solid-liquid separation and classification can be performed with one screen device. Thereby, an increase in the cost of the entire system can be avoided.

According to each of the thickening system and the dewatering system of the present invention, since the screen device of the present invention is applied, the size of the mesh can be made different in the longitudinal direction of the screen device. Thereby, it is possible to appropriately concentrate and dehydrate while conveying each of the to-be-processed liquid and the to-be-processed object introduced into the inside of the cylindrical body.

According to the water treatment system of the present invention, in both the thickening system and the dewatering system, the size of the mesh can be made different in the longitudinal direction of the screen device. In addition, by applying the screen device of the present invention to both the concentration system and the dehydration system, it is excellent from the viewpoint of system construction, and the cost of the entire system can be further reduced.

1 is a partially exploded perspective view showing a screen device according to a first embodiment.
Fig. 2 is a side view of the screen device shown in Fig. 1 as seen from one end side.
FIG. 3 is a diagram (enlarged view of part X in FIG. 2 ) for explaining the operation of the screen device shown in FIG. 1 .
Fig. 4 is a partially exploded perspective view showing a screen device according to a second embodiment.
Fig. 5 is a side view of the cylindrical body of the screen device shown in Fig. 4 as seen from one end side.
FIG. 6 is a diagram (enlarged view of part Y in FIG. 5 ) for explaining the operation of the screen device shown in FIG. 4 .
7 is a table showing a combination of a wire and a second wire forming a cylindrical body according to a modification of the second embodiment.
Fig. 8 is a part of a side view of the screen device according to pattern 1 of the third embodiment as viewed from one end side.
Fig. 9 is a part of a side view of the screen device according to pattern 2 of the third embodiment as viewed from one end side.
It is a figure which shows an example of the water treatment system which concerns on one Embodiment.
It is a figure which shows an example of the water treatment system which concerns on another embodiment.
12 is a diagram for explaining a concentration system according to an embodiment.
13 is a diagram for explaining a dewatering system according to an embodiment.

Hereinafter, with reference to drawings, the screen apparatus as embodiment is demonstrated, and then, the water treatment system which has this screen apparatus is demonstrated. Each embodiment and modification shown below are only an illustration to the last, and there is no intention to exclude the application of various deformation|transformation and technology which are not specified in the following embodiment etc. Each structure of this embodiment can be implemented with various deformation|transformation in the range which does not deviate from the meaning. Moreover, cooking can be selected as needed, or it can combine suitably.

[Overview of screen device]

The screen device passes a substance smaller than a predetermined size in sludge, excreta, or a mixture thereof (hereinafter, collectively referred to as "processed liquid" or "processed object"), or a predetermined amount of the to-be-treated It is provided with a mesh for passing water, and is used for solid-liquid separation, classification, etc. depending on the purpose. The screen device has a cylindrical body with a predetermined inner diameter formed by arranging a plurality of straight wire rods parallel to each other in a cylindrical shape. The mesh is a gap formed between two adjacent wire rods. The screen device of the present invention is configured such that the size of the mesh at one end of the cylindrical body can be changed (expandable) to be larger than the size of the mesh at the other end.

The screen device has four limiting parts (first limiting part, second limiting part, third limiting part, third limiting part, 4 limits). That is, the first limiting portion restricts movement of one end of each wire outward in the radial direction of the cylindrical body, and the second limiting portion restricts movement of one end of each wire inward in the radial direction of the cylindrical body. Further, the third limiting portion restricts movement of the other end of each wire outward in the radial direction of the cylindrical body, and the fourth limiting portion restricts the movement of the other end of each wire inward in the radial direction of the cylindrical body.

Further, the screen device includes an annular slide portion disposed in the vicinity of one end of the cylindrical body, and a control device for rotating the annular slide portion around a central axis. The annular slide part is a component concentric with the cylindrical body (having the same central axis as the central axis of the cylindrical body), and is rotatably supported with respect to the cylindrical body in the circumferential direction. The radially inner shape of the annular slide portion is a shape in which a plurality of convex portions of the same shape protruded toward the central axis and a plurality of concave portions of the same shape formed concavely alternately and regularly in the circumferential direction (for example, a trochoid curve shape). The number of convex portions is equal to the total number of wire rods, and the annular slide portion has a function as an internal gear.

The control device is an electronic control device (computer) that can be realized by applying a known hardware configuration. The control device rotates the annular slide part in a state where the predetermined inner diameter of the cylindrical body is maintained at the other end of the wire rod by the third limiting part and the fourth limiting part, whereby a mesh on one end side formed between two adjacent wire rods is It is possible to enlarge the size of the mesh on the other end side formed between two adjacent wire rods at the other end. In other words, although the movement in the radial direction of one end of the wire rod is restricted by the first and second limiting portions on one end side of the cylindrical body, by rotating the annular slide portion on the one end side, the distance between the two adjacent wire rods is The mesh formed in the . is enlarged to one end side. On the other hand, the size of the mesh at the other end of the wire rod is different in the longitudinal direction of the screen device in that the movement is restricted by the third and fourth limiting parts.

According to such a screen device, since the size of the mesh can be made different in the longitudinal direction of the screen device, multi-stage solid-liquid separation and classification are possible with one screen device. Thereby, an increase in the cost of the entire system can be avoided. In addition, the multi-step mentioned here also includes the thing which a step changes continuously.

Moreover, when the radially inner shape of the annular slide part is a shape along the trochoid curve, it is formed between adjacent wire rods with the movement of the concave shape and the convex shape along the trochoid curve (accompanied by the amount of change in the operation of the gear). The mesh size can be smoothly changed.

Hereinafter, the specific configuration of the screen device will be described with reference to three embodiments. Next, the water treatment system (concentration system and dehydration system are included) using a certain screen device is demonstrated.

Note that, for the wire rod (including the second wire rod) described below, a wedge wire can be used, for example.

[One. first embodiment]

[1-1. composition]

1 to 3 are diagrams for explaining a screen device 1A according to the first embodiment. As shown in Fig. 1, the screen device 1A has a cylindrical body 2A having a predetermined inner diameter formed by arranging a plurality of linear wire rods 3A parallel to each other in a cylindrical shape. The wire rod 3A of this embodiment has an isosceles triangle in cross-sectional shape orthogonal to the longitudinal direction, and all the wire rods 3A have the same shape. The wire rod 3A is arranged in a cylindrical shape with a rectangular plane (screen surface) formed from the bottom side of an isosceles triangle and a straight line extending in the longitudinal direction in a posture toward 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 rod 3A coincide with each other. In addition, unlike 2nd Embodiment mentioned later, in this embodiment, the magnitude|size of a mesh is the magnitude|size of the space|interval of 2 adjacent wire 3A.

Each wire 3A is caught movably in the radial direction, but its movement is restricted by the following limiting portion.

The screen device 1A has four restrictions that restrict each of the one end (left end in FIG. 1) and the other end (right end in FIG. 1) of each wire 3A from moving radially outward and radially inward, respectively. part (a first limiting part, a second limiting part, a third limiting part, a fourth limiting part). Further, the screen device 1A includes an annular slide portion 4A concentric with the cylindrical body 2A, and a control device (for example, the control devices 31 and 51 shown in FIG. 10 , not shown in FIG. 1 ). .

The annular slide portion 4A includes two annular slide plates 41A and 42A of the same shape as each other, formed integrally with the first limiting portion and disposed on the outer periphery of the cylindrical body 2A. In other words, the annular slide portion 4A is also a first limiting portion. That is, the two annular slide plates 41A and 42A have a function of limiting the movement of one end of each wire rod 3A to the outer side in the radial direction, and are rotationally controlled by the control device.

The radially inner shape of each annular slide plate 41A, 42A has 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 formed to be concave. is a shape (eg, along a trochoidal curve) that alternates and runs regularly in the circumferential direction. The total number of the convex portions 43a and the total number of the concave portions 44a are the same. The number of the convex portions 43a is equal to the number (total number) of the wire rods 3A, and the annular slide portion 4A has a function as an internal gear. As shown in Figs. 2 and 3, the annular slide plates 41A and 42A have each of the convex portions 43a pinched between the adjacent two wire rods 3A, and the concave portions 44a of the wire rods ( 3A) has a shape that makes surface contact with the corners of the vertex angles.

In the screen device 1A, the second limiting portion is an annular spring 5A that urges one end of the wire rod 3A outward in the radial direction of the cylindrical body 2A. Although the 2nd annular spring 5A of the same shape is illustrated in FIG. 1 as a 2nd limiting part, the number of the annular springs 5A is not limited to two, For example, one may be sufficient.

The annular spring 5A is fitted, for example, to a concave point 2g formed on the screen surface at one end of the cylindrical body 2A (each wire 3A). In this case, the inner surface of the annular spring 5A is arranged so that it does not protrude from the screen surface in the radial direction and is substantially flush with the screen surface.

In addition, in the screen device 1A, a cover member 6A formed of a thin plate is fixed to one end of the cylindrical body 2A. The cover member 6A has a cylindrical wall coaxial with the central axis O and an annular flat plate portion (annular portion), and is fixed to, for example, a casing (not shown) covering the entire screen device 1A. . The cover member 6A may be arranged so that the cylindrical wall covers the two annular slide plates 41A, 42A, and in this case, the position shift of the two annular slide plates 41A, 42A in the radial direction is restricted. can do. In addition, 6 A of cover members are abbreviate|omitted and shown in FIG.2 and FIG.3.

The third limiting portion formed at the other end of the cylindrical body 2A is at least one of the annular plate 7A and the two annular slide plates 91A and 92A arranged on the outer periphery of the cylindrical body 2A. The annular plate 7A is an annular plate member that restricts the movement of the other end of the wire rod 3A outward in the radial direction, and is fixed to, for example, the casing described above. On the other hand, the annular slide plates 91A, 92A are annular plate members comprised similarly to the annular slide plates 41A and 42A formed on the one end side.

Further, the fourth limiting portion is an annular spring 8A that urges the other end of the wire rod 3A outward in the radial direction of the cylindrical body 2A. In the screen device 1A shown in Fig. 1, the annular plate 7A and the two annular slide plates 91A and 92A are both formed, and the one end side and the other end side are configured in the same way. When the two annular slide plates 91A and 92A are provided as the third limiting portion, as will be described later, since the wire 3A can be moved also from the other end side, the mesh of the wire 3A from one end to the other end is Width variations are increased.

The upper drawing of FIG. 3 shows a state in which the size of the mesh is the same at one end side and the other end side. In this state, the concave portions 44a of the two annular slide plates 41A and 42A are displaced in the circumferential direction when viewed from the axial direction, and the wire 3A has a length ΔR from the deepest portion of the concave portions 44a. It is urged by the annular spring 5A in the state which entered radially inward. From this state, the control device forms a dent in the recessed portion 44a of the two annular slide plates 41A, 42A by rotating the two annular slide plates 41A and 42A in opposite directions to each other, the lower side of FIG. As shown in the figure, the wire rod 3A is moved radially outward toward this depression by the pressing force of the annular spring 5A serving as the second limiting portion. In this way, the control device enlarges the size of the mesh on the one end side and makes the size of the mesh different on the one end side and the other end side.

For example, the control device rotates one annular slide plate 41A clockwise, and rotates the other annular slide plate 42A counterclockwise. In addition, "rotation" as used herein means that each annular slide plate 41A, 42A is rotated and moved by about half the length in the circumferential direction of one wire 3A (slightly) to stop. As shown in the lower drawing of FIG. 3, when the recessed part 44a of two annular slide plates 41A, 42A overlaps when viewed from the axial direction, it becomes one dent. Since the urging force with respect to the radial direction outer side by the annular spring 5A is acting on each wire rod 3A, it squeezes into the formed dent, and moves radially outward by length ΔR. This greatly changes the size of the mesh. Further, from this state, when the two annular slide plates 41A and 42A are rotated in opposite directions to each other so that the two concave portions 44a are displaced in the circumferential direction, the size of the mesh is reduced.

[1-2. effect]

According to the screen device 1A described above, the size of the mesh can be changed only by slightly rotating the two annular slide plates 41A and 42A formed at one end in opposite directions to each other. For this reason, the size of the mesh can be made different in the longitudinal direction of the screen apparatus 1A with small power cost, and multistage solid-liquid separation and classification are attained with one screen apparatus 1A.

Moreover, since the size of the mesh is changed by rotation of the annular slide plates 41A and 42A provided on the outer periphery of the cylindrical body 2A, the to-be-processed object supplied to the inside of the cylindrical body 2A (for example, The size of the mesh can be easily changed even during processing of sludge, etc.). Thereby, high work efficiency can be implement|achieved. Accordingly, an increase in the cost of the entire system can be avoided.

Moreover, when the radially inner shape of the annular slide part 4A (two annular slide plates 41A, 42A) is a shape along a trochoid curve, concave shape and a convex shape along a trochoid curve are moved with the movement. (accompanied by the amount of change in the operation of the gear), it is possible to smoothly change the size of the mesh formed between the adjacent wire rods 3A.

Further, when the two annular slide plates 91A and 92A are also provided at the other end, the wire rod 3A can be moved in the radial direction also at the other end. For this reason, by controlling the rotation of the annular slide plates 41A, 42A and 91A, 92A at both ends independently or in conjunction with the control device, variations in the mesh width of the wire rod 3A from one end to the other can be increased. .

[1-3. Variation]

The configuration described above is an example. For example, the cross-sectional shape of the wire rod 3A (moving element) is not limited to an isosceles triangle, and may be other triangles or polygons other than triangles (square, hexagon, etc.), semicircular shape, circular shape, oval shape, etc. A cross-sectional shape wire rod (square bar or round bar) is applicable.

The concavo-convex shape of the annular slide plates 41A, 42A, 91A, 92A is not limited to the shape along the trochoid curve, and may be designed based on the cross-sectional shape of the wire 3A, the size of the mesh, and the like. In addition, the control device may rotate the two annular slide plates 41A, 42A in a mutually reverse direction relatively by fixing one of the two annular slide plates 41A, 42A and rotating the other. This "relatively opposite direction" is also included in the "relatively opposite direction" in the claims. Also in this case, when one dimple is formed by the two concave portions 44a, the wire rod moves in the radial direction, and the size of the mesh changes. The same applies to the case where two annular slide plates 91A and 92A are provided on the other end side.

The annular plate 7A and the annular slide plates 91A and 92A are formed at the other end of the screen device 1A shown in Fig. 1 as the third limiting portion, but either one may be formed as the third limiting portion. Further, the cover member 6A at one end of the screen device 1A may be omitted, or the same annular plate as the annular plate 7A may be formed instead of the cover member 6A.

[2. second embodiment]

[2-1. composition]

4 to 6 are diagrams for explaining the screen device 1B according to the second embodiment. As shown in FIG. 4 , the screen device 1B has a cylindrical body 2B of a predetermined inner diameter formed by arranging a plurality of linear wire rods 3B parallel to each other in a cylindrical shape. The wire rod 3B of this embodiment has a rectangular cross-sectional shape orthogonal to the longitudinal direction, and all the wire rods 3B have the same shape. The wire rod 3B is cylindrically arranged with the rectangular plane (screen surface) formed by the long side of the rectangle and a straight line extending in the longitudinal direction in an attitude toward 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 rod 3B coincide with each other.

As shown in FIG. 5, the cylindrical body 2B is further equipped with the linear 2nd wire 7B arrange|positioned in each between the adjacent two wire 3B. That is, the cylindrical body 3B is comprised by arrange|positioning two types of wire rods 3B, 7B alternately in a cylindrical shape. The cylindrical body 3B is rotatable around the central axis O.

The wire rod 3B is immovably fixed by the following limiting part. On the other hand, the 2nd wire 7B is formed in the cross-sectional shape or dimension which does not protrude toward the radial inner side of the cylindrical body 2B between two adjacent wire 3B. In other words, the second wire 7B moves outward in the radial direction of the cylindrical body 2B between two adjacent wire rods 3B, and thereafter, it is possible to return to the original position, but in the radial direction. It is impossible to get out from the inside. For example, when the cross-sectional shape of the second wire rod 7B is circular, the diameter of the second wire rod 7B is larger than the interval between the radially inner portions of the two adjacent wire rods 3B. Moreover, it is preferable that the diameter of the 2nd wire rod 7B is set to the dimension smaller than the space|interval of the radial direction outer side part of two adjacent wire rods 3B.

In addition, in the present embodiment, the size of the mesh, ie, the size of the gap formed between the two adjacent wire rods 3B, is determined by the second wire 7B interposed between the two wire rods 3B and the The size is the sum of the sizes of the two gaps formed between each of the two wire rods 3B.

As shown in FIG. 4 , in the screen device 1B, one end (left end in FIG. 4 ) and the other end (right end in FIG. 4 ) of each wire 3B move radially outward and radially inward, respectively. It has four limits (first limiting part, second limiting part, third limiting part, fourth limiting part) limiting what it can do. In addition, the screen device 1B includes an annular slide portion 4B concentric with the cylindrical body 2B, and a control device (for example, control devices 31 and 51 shown in FIG. 10 , not shown in FIG. 4 ). .

The first limiting portion is a first fixing plate 5B which is integrally formed with the second limiting portion, and which maintains an interval of one end of the adjacent two wire rods 3B at a predetermined distance and immovably fixes them. In other words, the first fixing plate 5B is a first limiting part and a second limiting part. Moreover, the 3rd limiting part is the 2nd fixing plate 6B which is formed integrally with the 4th limiting part, maintains the space|interval of the other end of the adjacent two wire 3B at a predetermined space|interval, and fixes it immovably. In other words, the second fixing plate 6B is a third limiting part and a fourth limiting part.

The first fixing plate 5B and the second fixing plate 6B are both annular plate members concentric with the central axis O, and are formed in the same shape as each other. The 1st fixed plate 5B is provided with the fitting part 5j of the same number as the wire 3B, which was recessedly formed in the radially inner side edge part. The fitting portion 5j is formed at the same circumferential position as the wire 3B, and each wire 3B is fitted into each fitting portion 5j. The 2nd fixed plate 6B is also comprised similarly, and by these, both ends of each wire 3B become immovable.

The annular slide portion 4B includes two annular slide plates 41B and 42B of the same shape as each other arranged on the outer periphery of the cylindrical body 2B. The annular slide plates 41B and 42B are rotationally controlled by a control device. The radially inner shape of each annular slide plate 41B, 42B has a plurality of convex portions 43b of the same shape protruded toward the central axis O and a plurality of concave portions 44b of the same shape formed to be concave. is a shape (eg, along a trochoidal curve) that alternates and runs regularly in the circumferential direction. The total number of the convex portions 43b and the total number of the concave portions 44b are the same. The number of the convex portions 43b is equal to the number (total number) of the wire rods 3B, and the annular slide portion 4B has a function as an internal gear.

In the screen device 1B, the same two annular slide plates 91B and 92B as the annular slide plates 41B and 42B are also formed at the other end of the cylindrical body 2B. In other words, the screen device 1B shown in Fig. 4 is configured so that one end side and the other end side are the same. When the two annular slide plates 91B and 92B are formed, as will be described later, since the second wire 7B can be moved also from the other end side, variations in the mesh width of the wire 3B from one end to the other end. this increases

The upper view of FIG. 6 shows a state in which the size of the mesh is the same at one end and the other end. In this state, the recessed portions 44b of the two annular slide plates 41B and 42B are displaced in the circumferential direction when viewed from the axial direction, and the second wire 7B is disposed on both sides of the adjacent two wire rods 3B. It is in contact, and the gap (mesh) formed between the two wire rods 3B is blocked. From this state, the control device forms a dent in the concave portion 44b of the two annular slide plates 41B and 42B by rotating the two annular slide plates 41B and 42B in opposite directions to each other, the lower side of FIG. As shown in the figure, the mesh is opened by moving the second wire rod 7B radially outward toward this depression by gravity or centrifugal force. In this way, the control device enlarges the size of the mesh on the one end side and makes the size of the mesh different on the one end side and the other end side.

For example, the control device rotates one annular slide plate 41B clockwise, and rotates the other annular slide plate 42B counterclockwise. In addition, as in the first embodiment, "rotation" as used herein means to rotate and move each annular slide plate 41B, 42B by about half the circumferential length of one wire 3B (slightly) to stop it. means that As shown in the lower drawing of FIG. 6, when the recessed part 44b of two annular slide plates 41B, 42B overlaps with the circumferential direction, it becomes one dent.

Since the centrifugal force acts on each 2nd wire 7B when the cylindrical body 2B is rotating around the periphery of the central axis O, it squeezes into the formed dent. Moreover, even if it is a case where the cylindrical body 2B is not rotating, the 2nd wire 7B located below at least squeezes into a dent by gravity. Thereby, the 2nd wire 7B moves from between two adjacent wire rods 3B, and the magnitude|size of a mesh changes. Further, from this state, when the two annular slide plates 41B and 42B are rotated in opposite directions to each other so that the two concave portions 44b are displaced in the circumferential direction when viewed from the axial direction, the size of the mesh is reduced.

[2-2. effect]

According to the screen device 1B described above, the size of the mesh can be changed only by slightly rotating the two annular slide plates 41B and 42B formed at one end in opposite directions to each other. For this reason, the size of a mesh can be made different in the longitudinal direction of the screen apparatus 1B with small power cost, and multistage solid-liquid separation and classification are attained with one screen apparatus 1B.

Moreover, since the size of the mesh is changed by rotation of the annular slide plates 41B and 42B provided on the outer periphery of the cylindrical body 2B, the to-be-processed object supplied inside the cylindrical body 2B (for example, The size of the mesh can be easily changed even during processing of sludge, etc.). Thereby, high work efficiency can be implement|achieved. Accordingly, an increase in the cost of the entire system can be avoided.

Moreover, when the radially inner shape of the annular slide part 4B (two annular slide plates 41B, 42B) is a shape along a trochoid curve, concave shape and a convex shape along a trochoid curve are moved with the movement. (accompanied by the amount of change in the operation of the gear), it is possible to smoothly change the size of the mesh formed between the adjacent wire rods 3B.

In addition, when the two annular slide plates 91B and 92B are also provided at the other end, the second wire 7B can be moved also at the other end. For this reason, by controlling the rotation of the annular slide plates 41B, 42B and 91B, 92B at both ends independently or in conjunction with the control device, variations in the mesh width of the wire rod 3B from one end to the other can be increased. .

[2-3. Variation]

The configuration described above is an example. For example, the cross-sectional shape of the wire rod 3B (fixed element) is not limited to a rectangle, and may be a polygon other than a rectangle (triangle or trapezoid, etc.) Square bar, triangular bar, trapezoidal bar, round bar, etc.) can be applied. Similarly, the cross-sectional shape of the second wire 7B (moving element) is not limited to a circular shape, and may be a polygon other than a rectangle (such as a trapezoid or a pentagon), and a wire rod having various cross-sectional shapes, such as a semicircle shape, a circle shape, and an oval shape. (trapezoidal bar, pentagonal bar, round bar, etc.) is applicable.

Fig. 7 shows an example of a combination of a wire as a stationary element and a second wire as a moving element. Configuration 1 in FIG. 7 is a wire 3B and a second wire 7B constituting the cylindrical body 2B shown in FIG. 5 . When the wire rod of the fixing element has a cross-sectional shape of an isosceles triangle, the cylindrical body is formed with its vertex angle facing outward in the radial direction. Moreover, when the wire rod of a fixed element has the cross-sectional shape of an isometric trapezoid, the cylindrical body is formed in the attitude|position in which the shorter one of an upper bottom and a lower bottom faced the radial direction outer side. Conversely, in the case where the wire rod of the moving element has an isometric trapezoidal cross-sectional shape, the longer one of the upper bottom and the lower bottom is disposed between two adjacent wire rods in an attitude toward the radially outward side.

In addition, the concavo-convex shape of the annular slide plates 41B, 42B, 91B, 92B is not limited to the shape along the trochoid curve, and may be designed based on the cross-sectional shape of the second wire 7B, the size of the mesh, and the like. Further, the control device may be relatively rotated in the opposite direction to each other by fixing one of the two annular slide plates 41B and 42B and rotating the other. This "relatively opposite direction" is also included in the "relatively opposite direction" in the claims. Even in this case, when one dimple is formed by the two concave portions 44b, the wire rod moves and the size of the mesh changes. The same applies to the case where two annular slide plates 91B and 92B are provided on the other end side. In addition, you may abbreviate|omit the annular slide plates 91B, 92B of the other end side.

[3. third embodiment]

8 and 9 are diagrams for explaining the screen devices 1C and 1D according to the third embodiment, and are diagrams corresponding to FIG. 3 . In the third embodiment, similarly to the wire rod 3A of the first embodiment, a configuration (pattern 1) in which the cylindrical body 2C is formed by the wire rod 3C configured to be movable, and the wire rod 3B of the second embodiment ), the configuration (pattern 2) in which the cylindrical body 2D is formed by the non-movable wire rod 3D is included. Hereinafter, these are demonstrated in order.

[3-1. Configuration (Pattern 1)]

As shown in FIG. 8, the wire 3C of the screen device 1C is arranged in a cylindrical shape parallel to each other, similarly to the wire 3A of the first embodiment, to form a cylindrical body 2C of a predetermined inner diameter. do. A pin 3p protruding in the axial direction is formed in the axial end face of each wire 3C. The pin 3p may be formed integrally with the wire rod 3C, or may be added thereafter. A cross-sectional shape orthogonal to the axial direction (projection direction) of the pin 3p is an elliptical shape extending in the radial direction of the cylindrical body 2C.

The screen device 1C, similarly to the screen device 1A of the first embodiment, restricts movement of each of one end and the other end of each wire 3C radially outward and radially inward, respectively. n limiting portions (a first limiting part, a second limiting part, a third limiting part, a fourth limiting part). In addition, the screen device 1C includes an annular slide portion 4C concentric with the cylindrical body 2C, and a control device (for example, the control devices 31 and 51 shown in FIG. 10, not shown in FIG. 8). have

The annular slide part 4C is an annular plate member concentric with the central axis O, and is integrally formed with the first limiting part. In other words, the annular slide portion 4C is also a first limiting portion. That is, while having a function of restricting the movement of one end of each wire rod 3C outward in the radial direction, the annular slide part 4C is rotation-controlled by a control device. The radially inner shape of the annular slide portion 4C 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 formed concavely in the circumferential direction. It is a shape that alternates and continues regularly (eg, along a trochoidal curve). The total number of the convex portions 43c and the total number of the concave portions 44c are the same. The number of the convex portions 43c is equal to the number (total number) of the wire rods 3C, and the annular slide portion 4C has a function as an internal gear.

The second limiting portion is an annular plate 5C concentric with the cylindrical body 2C. The radially outer shape of the annular plate 5C corresponds to the radially inner shape of the annular slide portion 4C in a one-to-one manner. The radially outer shape of the annular plate 5C of the present embodiment includes a plurality of convex portions 5e of the same shape formed to protrude outward in the radial direction and a plurality of concave portions 5f of the same shape formed concavely in the circumferential direction. It is a shape that alternates and continues regularly (eg, along a trochoidal curve).

The annular slide portion 4C and the annular plate 5C are arranged at the same axial position as each other, and the end face of the annular slide portion 4C in the radial direction and the end surface of the annular plate 5C in the radial direction in the circumferential direction A groove-like space 6C of the same width is formed in the . Specifically, the concave portion 5f of the annular plate 5C is positioned inside the convex portion 43c of the annular slide portion 4C in the radial direction, and the concave portion 44c of the annular slide portion 4C is positioned in the radial direction. It is arrange|positioned so that the convex part 5e of the annular plate 5C may be located inside. The width (diametric dimension) of the groove-like space 6C is set to be substantially equal to the radial length of the pin 3p. In this groove-like space 6C, one end portion of the wire rod 3C (here, the pin 3p) is disposed so as to slide freely.

Further, the annular slide portion 4C and the annular plate 5C are, for example, a first portion (not shown) of the annular slide portion 4C protruding in the axial direction at a plurality of points and the annular plate 5C. A second part (not shown) connecting the first part (not shown) to each other may be disposed, and supported so as to rotate around the central axis O in a state integrated with each other. Alternatively, each of the annular slide portion 4C and the annular 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 shown in particular, it may be comprised similarly to the one end, Even if it provides the annular plate 7A (3rd restriction|limiting part) and the annular spring 8A of 1st Embodiment. do.

The upper diagram of FIG. 8 shows a state in which the size of the mesh is the same at one end side and the other end side. In this state, the pin 3p is positioned between the convex portion 43c of the annular slide portion 4C and the concave portion 5f of the annular plate 5C, and the state in which the wire 3C enters the most radially inner side is do. From this state, the control device rotates the grooved space 6C in the same direction by rotating the annular slide portion 4C and the annular plate 5C in the same direction and at the same speed to each other, as shown in the lower drawing of FIG. Similarly, the pin 3p of the wire rod 3C is moved (slided) radially outward along the groove-like space 6C. When the pin 3p is positioned between the concave portion 44c of the annular slide portion 4C and the convex portion 5e of the annular plate 5C, the size of the mesh at one end becomes the maximum, so that the size of the mesh is It is different from one end side and the other end side. Further, from this state, when the annular slide portion 4C and the annular plate 5C are rotated in the same direction, the grooved space 6C also rotates in the same direction, and the pins 3p of the wire 3C are moved in the grooved space ( As it moves (slides) radially inward along 6C), the size of the mesh is reduced.

[3-2. Configuration (Pattern 2)]

Next, the structure of the pattern 2 in which the cylindrical body 2D was formed by the wire 3D comprised immovably is demonstrated. As shown in FIG. 9, the wire 3D of the screen device 1D is arranged in a cylindrical shape parallel to each other similarly to the wire 3B of the second embodiment to form a cylindrical body 2D of a predetermined inner diameter. do. Moreover, the cylindrical body 2D is further equipped with the linear 2nd wire 7D arrange|positioned in each between the adjacent two wire rods 3D. That is, in the cylindrical body 3D, two types of wire rods 3D and 7D are alternately arranged in a cylindrical shape, and are comprised.

The second wire 7D has a cross-sectional shape that does not protrude toward the radially inner side of the cylindrical body 2D between two adjacent wire rods 3D, similarly to the second wire 7B of the second embodiment, or formed in dimensions. The cylindrical body 3D is rotatable around the central axis O. A pin 7p protruding in the axial direction is formed in the axial end face of each second wire 7D. The pin 7p may be integrally formed with the second wire 7D, or may be added thereafter. A cross-sectional shape orthogonal to the axial direction (projection direction) of the pin 7p is an elliptical shape extending in the radial direction of the cylindrical body 2D.

The screen device 1D restricts movement of each of one end and the other end of each wire 3D radially outward and radially inward, respectively, similarly to the screen device 1B of the second embodiment. n limiting portions (a first limiting part, a second limiting part, a third limiting part, a fourth limiting part). Further, the screen device 1D includes an annular slide portion 4D concentric with the cylindrical body 2D, an annular plate 5D concentric with the cylindrical body 2D, and a control device (for example, as shown in FIG. 10 ). control devices 31 and 51 (not shown in Fig. 9).

The first limiting portion is formed integrally with the second limiting portion, similarly to the second embodiment, and a first fixing plate that maintains an interval of one end of the adjacent two wire rods 3D at a predetermined distance and immovably fixes the first limiting portion. (not shown) is. Moreover, the 3rd limiting part is also formed integrally with the 4th limiting part similarly to 2nd Embodiment, The 2nd which maintains the space|interval of the other end of the adjacent 2 wire 3D at a predetermined space|interval and fixes immovably. It is a fixed plate (not shown). Since the structure of the 1st fixed plate and the 2nd fixed plate is the same as that of the 1st fixed plate 5B and the 2nd fixed plate 6B of 2nd Embodiment, the description is abbreviate|omitted. Both ends of each wire rod 3D become immovable by a 1st fixed plate and a 2nd fixed plate.

The annular slide part 4D and the annular plate 5D are configured similarly to the pattern 1 of the third embodiment. The annular slide part 4D is an annular plate member concentric with the central axis O, and is rotationally controlled by a control device. The radially inner shape of the annular slide portion 4D includes 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 formed concavely in the circumferential direction. It is a shape that alternates and continues regularly (eg, along a trochoidal curve). The number of the convex portions 43d is equal to the total number of the wire rods 3D, and the annular slide portion 4D has a function as an internal gear.

The annular plate 5D is disposed in the vicinity of one end of the cylindrical body 2D (specifically, the same axial position as that of the annular slide portion 4D). The radially outer shape of the annular plate 5D corresponds to the radially inner shape of the annular slide portion 4D in a one-to-one correspondence. The radially outer shape of the annular plate 5D of the present embodiment includes a plurality of convex portions 5g of the same shape formed to protrude outward in the radial direction and a plurality of concave portions 5h of the same shape formed to be concave in the circumferential direction. It is a shape that alternates and continues regularly (eg, along a trochoidal curve).

The annular slide portion 4D and the annular plate 5D have a groove-like space 6D having the same width in the circumferential direction in the radially inner end face of the annular slide portion 4D and the radially outer end surface of the annular plate 5D. arranged to form Concretely, the recessed part 5h of the annular plate 5D is located radially inside of the convex part 43d of the annular slide part 4D, The radial direction of the recessed part 44d of the annular slide part 4D. It is arrange|positioned so that the convex part 5g of the annular plate 5D may be located inside. The width (diametric dimension) of the groove-like space 6D is set to be substantially equal to the radial length of the pin 7p. In this groove-like space 6D, one end portion of the second wire member 7D (here, the pin 7p) is disposed so as to slide freely.

The upper figure of FIG. 9 shows a state in which the size of the mesh is the same at one end side and the other end side. In this state, the pin 7p is positioned between the convex portion 43d of the annular slide portion 4D and the concave portion 5h of the annular plate 5D, and the second wire 7D is the most radially inner (neighbor). between the two wire rods 3D). From this state, the control device rotates the grooved space 6D in the same direction by rotating the annular slide part 4D and the annular plate 5D in the same direction to each other, and as shown in the lower view of FIG. The pins 7p of the two wire rods 7D are moved (slided) radially outward along the groove-like space 6C.

When the pin 7p is positioned between the concave portion 44d of the annular slide portion 4D and the convex portion 5g of the annular plate 5D, the size of the mesh on the one end side becomes the maximum, so that the size of the mesh is It is different from one end side and the other end side. Moreover, from this state, when the annular slide part 4D and the annular plate 5D are rotated in the same direction, the grooved space 6D also rotates in the same direction, and the pin 7p of the 2nd wire 7D is grooved. As it moves (slides) diametrically inward along space 6D, the size of the mesh is reduced.

[3-3. effect]

According to each of the screen devices 1C and 1D of the pattern 1 and the pattern 2 described above, it is only necessary to rotate each annular slide part 4C, 4D and each annular plate 5C, 5D in the same direction and at the same speed. You can change the size of the mesh. For this reason, it is possible to make the mesh size different in the longitudinal direction of each screen device 1C, 1D at a small power cost, and it becomes possible to perform multi-step solid-liquid separation and classification with one screen device 1C, 1D. Moreover, in the case of the screen devices 1C and 1D, since the annular slide part 4C, 4D integrally formed with the first limiting part may be a single member, cost reduction can be realized.

In addition, when the radially inner shape of the annular slide parts 4C and 4D is a shape along the trochoid curve, with the movement of the concave shape and the convex shape along the trochoid curve (accompanied by the amount of change in the operation of the gear), The size of the mesh formed between each of the adjacent wire rods 3C and 3D can be smoothly changed.

[3-4. Variation]

Each structure of the pattern 1 and pattern 2 mentioned above is an example. For example, the above screen devices 1C and 1D include end plates 8C and 8D provided with guide holes 8e and 8f for guiding the movement of the pins 3p and 7p in the radial direction. You can take more. The structure in the case where the end plates 8C and 8D are formed is partially enlarged and shown in the point enclosed by the dashed-dotted line in FIG. 8, FIG. In addition, although the end plate 8C and the end plate 8D do not need to have the same structure, both are demonstrated here for convenience.

Each end plate 8C, 8D is a plate-shaped member arrange|positioned in the vicinity of one end of each cylindrical body 2C, 2D. The end plates 8C and 8D may have, for example, an annular shape or a circular shape that covers the opening on the one end side of the cylindrical bodies 2C and 2D. When the end plates 8C, 8D have an annular shape, their positions are, for example, between the end faces of one end of each wire 3C, 7D and the annular slide portions 4C, 4D and the annular plates 5C, 5D. can be set to On the other hand, when the end plates 8C and 8D have a circular shape that blocks the opening, they may be disposed on one end side of the annular slide portions 4C and 4D and the annular plates 5C and 5D.

The guide hole 8e is formed in the end plate 8C corresponding to the position of each wire rod 3C, and is a recessed or through hole of a predetermined length extending radially from the central axis O of the cylindrical body 2C. . The control device moves one end of the wire rod 3C along the corresponding guide hole 8e by rotating the annular slide portion 4C. If it is the screen device 1C of such a structure, each wire 3C can be moved stably.

The guide hole 8f is formed in the end plate 8D corresponding to the position of each of the second wire rods 7D, and extends radially from the central axis O of the cylindrical body 2D by a predetermined length of recess or penetration. it's a ball The control device moves one end of the second wire rod 3D along the corresponding guide hole 8f by rotating the annular slide portion 4D. If it is the screen device 1D of such a structure, each 2nd wire 3D can be moved stably. Further, when the end plates 8C, 8D have a circular shape blocking the opening, the guide holes 8e and 8f are preferably formed as dents (without penetrating them) from the viewpoint of avoiding leakage of the object to be processed.

The above pins 3p and 7p are not essential and can be omitted. In this case, the end of the one end side of the wire rod 3C or the second wire rod 7D is arranged to slide freely in the grooved spaces 6C and 6D, and the wire 3C is rotated with the grooved spaces 6C and 6D. ) or the end of the second wire member 7D at one end may be configured to move in the radial direction.

You may change the shape of each wire 3C, 3D of the said screen apparatus 1C, 1D to the shape of the wire described in each modified example of 1st Embodiment and 2nd Embodiment. In addition, the radially inner shape of the annular slide parts 4C and 4D is an example, and it is not limited to the shape along a trochoidal curve, The radially outer shape of the annular plate 4D, 5D is also an annular slide part 4C, What is necessary is just a shape corresponding to 4D) and one-to-one.

[4. Application example]

Next, the water treatment system to which the above-mentioned screen devices 1A-1D is applied is demonstrated as an application example. For the following application examples, any of the above-described screen devices 1A to 1D may be used. Therefore, in the following description, the screen devices 1A to 1D are generically referred to as "screen device 1", and similarly, cylindrical bodies 2A to 2D provided in each screen device 1A to 1D. is denoted as “cylindrical body 2”, the wires 3A to 3D are denoted as “wire rod 3”, and the annular slide portions 4A to 4D are denoted as “annular slide part 4”, respectively.

[4-1. water treatment system]

10 and 11 are views for explaining the water treatment systems 10 and 10' to which the above screen device 1 is applied. The water treatment systems 10 and 10' are systems for concentrating and dehydrating sludge, excreta, or a mixture of sludge and excrement, and concentrating and dehydrating these treatment targets. The water treatment system 10 of FIG. 10 is a dewatering treatment system of sewage sludge, and the water treatment system 10' of FIG. 11 is a manure treatment system.

The water treatment system 10, 10' includes mixing tanks 20 and 20' for mixing and coagulating by supplying at least one of a dehydration aid, a metal removal agent, and a coagulant to a treatment target, and the screen device 1 described above. It has a concentrating system 30 to which is applied, and a dehydration system 50 to which the above-mentioned screen device 1 is applied. The concentration system 30 is an example of a water treatment system that introduces the liquid stored in the mixing tank 20 therein as a to-be-treated liquid. Moreover, the dewatering system 50 is an example of the water treatment system which introduce|transduces the concentrated sludge which the concentration system 30 discharged|emitted as a to-be-processed object inside.

In Fig. 10, in addition to the thickening system 30, the configuration of a thickening system having a thickening device 80, which is not the above-described screen device 1, but a conventional screen device (mesh size is constant) is shown by broken lines. is indicating The concentration device 80 is an apparatus for receiving the liquid stored in the mixing tank 20 and discharging the concentrated sludge which concentrated this liquid.

Usually, since the thickening system and the dewatering system are separately bidding for each other, it is not limited that the screen device 1 can be introduced into both systems. So, at least the dewatering system is introduced with the screen device 1, and the concentration system is equipped with the screen device 1 (thickening system 30) and without (the system using the thickening device 80). Compare and explain both sides.

As shown in FIG. 10, in the mixing tank 20, the chemical|medical agent mixing tank 24 which mixes a process object (for example, sludge), and the metal removal chemical|medical agent supplied from the chemical|medical agent supply apparatus 25, and chemical|medical agent mixing tank A condensing agent mixing tank 27 for mixing and condensing the liquid supplied from 24 and the condensing agent supplied from the condensing agent supply device 28 is included. Each of these mixing tanks 24 and 27 is provided with stirring devices 26 and 29 that stir the liquid inside.

The liquid to be treated mixed in the mixing tank 20 is supplied to the screen device 1 or the concentration device 80 of the concentration system 30 . As described above, normally, in a system using the concentration system 30 and the concentration device 80 , only one of them is installed as the concentration system. Therefore, in response to the installed concentration system, the liquid to be treated is the concentration system. It is supplied only to either one of the screen device (1) of (30) and the concentrating device (80).

When the liquid to be treated is supplied to the concentration system 30 , in the concentration system 30 , the control device 31 controls the screen device ( The mesh of 1) is changed, and the driving device 33 is controlled to rotate the cylindrical body 2 (described later). Thereby, the to-be-processed liquid is separated into solid-liquid in multiple steps, and concentrated sludge (to-be-processed object) and a concentrated separated liquid are discharged|emitted. The discharged concentrated sludge (object to be treated) is supplied to the dewatering system 50 . Here, the concentrated sludge (to-be-processed object) is a liquid. In addition, the detailed structure of the concentration system 30 is mentioned later.

On the other hand, when the liquid to be treated is supplied to the concentrating device 80 , the liquid to be treated is separated into solid-liquid in the concentrating device 80 , but since the size of the mesh is constant, feedback control as in the concentrating system 30 is impossible. do. For this reason, the thickening apparatus 80 cannot respond to the change of the property of a process object or to-be-processed liquid, and it is difficult to stabilize the property of the concentrated sludge separated by the thickening apparatus 80 to a desired property. The concentrated sludge is stored in the storage tank 81 and then supplied to the mixing tank 82 for dehydration, but since there is a possibility that it may not have a desired property, in the mixing tank 82 for dehydration, the chemical supply device ( At least one of the metal removal chemical supplied from 83) and the condensing agent supplied from the condensing agent supply device 84 is again mixed with the concentrated sludge, and it is necessary to make the concentrated sludge into a desired property.

That is, in the said water treatment system which employ|adopted the concentrating system using the concentrating device 80, it is necessary to supply a chemical|medical agent or a condensing agent in the mixing tank 20 and the mixing tank 82 for dehydration. Therefore, compared with the water treatment system employing the concentration system 30 using the screen device 1, not only the installation cost of the storage tank 81 and the mixing tank 82 for dehydration, but also the cost of the chemical or condensing agent. However, cost increases are unavoidable. In other words, the water treatment system 10 employing the concentration system 30 using the screen device 1 has an installation cost and an operating cost compared to the water treatment system employing the concentration system using the concentration device 80 . excellent from the point of view of

Moreover, the concentrated sludge (to-be-processed object) discharged|emitted from the mixing tank 82 for dehydration is supplied to the dewatering system 50. As shown in FIG.

The concentrated sludge as a target object is supplied to the screen device 1 of the dewatering system 50 . In the dewatering system 50 , the control device 51 changes the mesh of the screen 1 by feedback control (described later) based on the measurement result of the moisture content measuring device 52 , and the driving device according to the feedback control (53) (for example, an electric motor, etc.) is controlled. The drive device 53 includes a device for rotating the cylindrical body 2 , a device for rotating a screw shaft 46 to be described later, and a device for moving a back pressure plate 49 to be described later.

The dewatering system 50 discharges the dewatered sludge which dehydrated the water|moisture content of the sludge. The detailed configuration of the dewatering system 50 will be described later.

The water treatment system 10' shown in FIG. 11 is a dehydration auxiliary agent mixing tank 21 in which a processing target (eg, excrement) and a dehydration auxiliary agent supplied from the dehydration auxiliary agent supply device 22 are mixed in the mixing tank 20'. ) is different from the water treatment system 10 of FIG. 10 in that it is included. In the dehydration auxiliary agent mixing tank 21, a stirring device 23 for stirring the liquid inside is provided. In the water treatment system 10' of FIG. 11 , the liquid mixed in the dehydration auxiliary agent mixing tank 21 is supplied to the chemical mixing tank 24 . Since the subsequent process is the same as that of the water treatment system 10 of FIG. 10, the description is abbreviate|omitted. In addition, although illustration is abbreviate|omitted in FIG. 11, also in the water treatment system 10' of FIG. 11, instead of the concentration system 30, the concentration apparatus 80 is applicable.

[4-2. Concentration system]

12 is a diagram for explaining the concentration system 30 . The thickening system 30 includes a screen device 1 in which the central axis O of the cylindrical body 2 is substantially horizontally arranged, and a driving device that rotates the cylindrical body 2 around the central axis O. (33) (for example, an electric motor etc.), an introduction pipe 34 for supplying the liquid to be treated into the inside of the cylindrical body 2 from the other end of the screen device 1 (right end in FIG. 12 ), and the screen device; It has a concentration measuring device 32 for measuring the concentration of concentrated sludge discharged from the one end of (1) (the left end in FIG. 12 ). In addition, in FIG. 12, illustration of the rotation mechanism which rotates the annular slide part 4 of the screen apparatus 1 is abbreviate|omitted.

The screen device 1 is disposed in the casing 35 , the concentrated separated liquid is discharged from a separated liquid discharge pipe 38 formed in the lower portion of the casing 35 , and the concentrated sludge is discharged from an opening at one end of the casing 35 . (37) is discharged from To the other end of the cylindrical body 2 , a support column or a wall plate 36 for rotating the cylindrical body 2 is fixed by a driving device 33 . The operation of the drive device 33 is controlled by the control device 31 . The drive device 33 may rotate the cylindrical body 2 constantly or may rotate it intermittently. In the case of intermittent rotation, the cylindrical body 2 may be rotated halfway in one direction or may be rotated forward and reverse (reciprocating).

The control apparatus 31 performs feedback control according to the density|concentration of the concentrated sludge which the density|concentration meter 32 outputted, and changes the magnitude|size of a mesh. For example, when the density|concentration of concentrated sludge is lower than a predetermined 1st threshold value (the moisture content is high), the control apparatus 31 judges that the mesh at the present time is small, and enlarges the size of a mesh. Conversely, if the concentration of the concentrated sludge is higher than the first threshold (low moisture content), it is determined that the mesh at the present time is large, and the size of the mesh is reduced. In this way, the control device 31 changes the size of the mesh through feedback based on the result measured by the density meter 32 . Moreover, instead of using a 1st threshold value, the control apparatus 31 may enlarge the size of a mesh so that the density|concentration of concentrated sludge is low, and may reduce the size of a mesh so that the density|concentration of concentrated sludge is high.

Moreover, the control apparatus 31 may feedback-control the drive apparatus 33 so that the rotational speed of the cylindrical body 2 may be changed according to the density|concentration of the concentrated sludge which the density|concentration meter 32 outputted. For example, if the concentration is lower than a predetermined second threshold value (when the moisture content is high), the rotation speed may be increased, and if the concentration is higher than the second threshold value (when the moisture content is low), the rotation speed may be decreased. In addition, instead of using the second threshold value, the control device 31 may increase the rotation speed as the concentration is low, and decrease the rotation speed as the concentration is high.

According to the above-mentioned thickening system 30, since the said screen apparatus 1 is applied, the size of a mesh in the longitudinal direction of the screen apparatus 1 can be made different. Specifically, by reducing the size of the mesh on the side of the introduction tube 34 and increasing the size of the mesh on the side of the opening 37 , the liquid to be processed introduced into the cylindrical body 2 is transferred to the opening 37 . It can concentrate appropriately while conveying to the side. In addition, when the mesh on the side of the opening 37 is made large, it is preferable that the difference in the size of the mesh on the side of the introduction pipe 34 and the side of the opening 37 be set to about 3 mm at most, for example.

[4-3. dewatering system]

13 : is a figure explaining the dewatering system 50. FIG. The dewatering system 50 includes a screen device 1 in which the central axis O of the cylindrical body 2 is substantially horizontally arranged, and a cylindrical body 2 from one end of the screen device 1 (the left end in Fig. 13). ), an inlet pipe 54 for supplying the object to be treated into the interior of the cylindrical body 2 and disposed on the central axis O of the cylindrical body 2, It has the screw shaft 56 conveyed to the right end in FIG. 13), and the moisture content measuring device 52 which measures the moisture content of the dewatered sludge discharged|emitted from the other end. In addition, in FIG. 13, illustration of the rotation mechanism which rotates the annular slide part 4 of the screen apparatus 1 is abbreviate|omitted. In addition, in FIG. 13, three control parts (rotation control part 51x, back pressure control part 51y, mesh control part 51z) formed in the control device 51 are divided and expressed for convenience.

The screen device 1 is disposed in the casing 55 , the dewatered separation liquid is discharged from the separation liquid discharge pipe 60 formed at the lower portion of the casing 55 , and the dewatered sludge is discharged at the other end of the casing 55 . discharged from the ball 61a. A closing plate 58 for blocking the opening is fixed to one end of the cylindrical body 2 , and a back pressure plate 59 is formed at the other end of the cylindrical body 2 . The closure plate 58 is fixed to the introduction pipe 54 or the casing 55, for example. The closure plate 58 may be used also as the end plates 8C and 8D described in the modified example of the third embodiment. The back pressure plate 59 is a member movable on the central axis O, and forms a discharge hole 61a at the other end of the back pressure plate 59 and the cylindrical body 2 . The dewatered sludge discharged from the discharge hole 61a is discharged through the dewatered sludge discharge pipe 61 .

The introduction pipe 54 is located on the central axis O, passes through the closure plate 58 , and opens inside the cylindrical body 2 . The opening (introduction hole 54a ) of the introduction pipe 54 is disposed, for example, at the same axial position as the annular slide portion 4 . The screw shaft 56 is coaxial with the introduction tube 54 and is arranged inside the introduction tube 54 in a double tube structure. A screw blade 57 having a length to the vicinity of the inner periphery of the cylindrical body 2 is formed in the screw shaft 56 .

The control device 51 includes a rotation control unit 51x for controlling the rotation of the screw shaft 56 and the cylindrical body 2, respectively, a back pressure control unit 51y for controlling the pressing force to the back pressure plate 59, and a screen; A mesh control section 51z for controlling the size of the mesh of the device 1 is formed.

The rotation control unit 51x controls the drive device 53 (not shown in FIG. 13 ) to rotate the screw shaft 56 and the cylindrical body 2 at different rotation speeds, respectively, from the introduction hole 54a to the cylindrical body ( 2), the to-be-processed object supplied to the one end side is conveyed, crimping|compressing to the other end, and dewatered sludge is discharged|emitted from the discharge hole 61a of the other end side.

The rotation control part 51x feedback-controls the torque which drives the screw shaft 56 and the cylindrical body 2 according to the moisture content of the dewatered sludge output by the moisture content meter 52 provided in the dewatered sludge discharge pipe 61 . The torque may be detected by, for example, a load cell (not shown) or by measuring an inverter current value when the drive device 53 is an inverter-controlled electric motor.

The rotation control unit 51x, for example, increases the torque than the current torque when the moisture content is higher than a third predetermined threshold value, and makes the torque smaller than the current torque when the moisture content is lower than the third threshold value do. In addition, instead of using the 3rd threshold value, the rotation control part 51x may increase torque so that a moisture content is high, and may make a torque small, so that a moisture content is low.

The back pressure control part 51y feedback-controls the position of the back pressure plate 59 according to the moisture content of the dewatered sludge output by the moisture content measuring device 52, and adjusts a pressing force (back pressure). For example, when the moisture content is higher than a predetermined fourth threshold value, the back pressure control unit 51y increases the pressing force than the pressing pressure at the present time, and when the moisture content is lower than the fourth threshold value, lowers the pressing force than the pressing pressure at the present time. . In addition, instead of using the fourth threshold value, the back pressure control unit 51y may increase the pressing force as the water content is higher, and decrease the pressing force as the water content is lower.

The mesh control unit 51z performs feedback control according to the moisture content of the dehydrated sludge output by the moisture content measuring device 52 to change the size of the mesh. For example, when the moisture content is higher than a predetermined fifth threshold value, the mesh control unit 51z determines that the mesh at the present time is small, and enlarges the size of the mesh. Conversely, if the moisture content is lower than the fifth threshold, it is determined that the current mesh is large, and the size of the mesh is reduced. In addition, instead of using the 5th threshold value, the mesh control part 51z may enlarge the size of a mesh as the moisture content is high, and may reduce the size of a mesh so that a moisture content is low.

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

According to the dewatering system 50 described above, since the above screen device 1 is applied, the size of the mesh can be made different in the longitudinal direction of the screen device 1 . Specifically, by increasing the size of the mesh on the inlet pipe 54 side and reducing the size of the mesh on the discharge hole 61a side, the dehydrated sludge compressed inside the cylindrical body 2 is removed from the discharge hole 61a. ), it can be dehydrated appropriately while conveying it to the side. In addition, when the mesh on the side of the introduction pipe 54 is increased, it is preferable that the difference between the sizes of the meshes on the side of the introduction pipe 54 and the side of the discharge hole 61a is, for example, at most about 0.1 to 2 mm. do.

[4-4. Effect of water treatment system]

According to the water treatment systems 10, 10' having the above-described concentrating device 80 and dewatering system 50, at least the above-mentioned screen device 1 is applied to the dewatering system 50, so that the screen device ( 1) The size of the mesh in the longitudinal direction can be different. For this reason, it becomes easy to obtain the target processing capability with one screen apparatus 1, and the cost of the whole system can be suppressed.

Moreover, as shown in FIG. 10, according to the water treatment system 10 in which the said screen device 1 was applied to both the concentration system 30 and the dehydration system 50, in addition to the dehydration system 50, it concentrates Also in the system 30 , it becomes possible to vary the size of the mesh in the longitudinal direction of the screen device 1 . Moreover, in this case, since the apparatus shown by the broken line in FIG. 10 is unnecessary, it is excellent also from a viewpoint of system construction, and the cost of the whole system can be suppressed more.

[4-5. Variation]

All of the above-mentioned water treatment systems 10 and 10', the concentration system 30, and the dehydration system 50 are examples. For example, a moisture content meter may be used for the concentration system 30 , and a concentration meter may be used for the dehydration system 50 .

1, 1A, 1B, 1C, 1D: screen device
2, 2A, 2B, 2C, 2D: Cylindrical body
2g: concave point
3, 3A, 3B, 3C, 3D: wire rod
3p: pin
4, 4A, 4C: annular slide part (first limiting part)
4, 4B, 4D: Annular slide part
5A: annular spring (second limiting part)
5B: first fixing plate (first limiting part, second limiting part)
5C: annular plate (second limiting part)
5D: Illusion Plate
5e, 5g: convex
5f, 5h: recesses
5j: fit part
6A: cover member (annular plate)
6B: second fixing plate (third limiting part, fourth limiting part)
6C, 6D: space on the groove
7A: annular plate (third limiting part, annular plate member)
7B, 7D: 2nd wire rod
7p: pin
8A: annular spring (fourth limiting part)
8C, 8D: end plate
8e, 8f: guide ball
10, 10' : water treatment system
20, 20' : mixing tank
21: dehydration aid mixing tank
22: dehydration aid supply device
23: stirring device
24: drug mixing tank
25: drug supply device
26: stirring device
27: condensing agent mixing tank
28: condensing agent supply device
29: stirring device
30: enrichment system
31: control device
32: concentration meter
33: drive device
34: introduction tube
35: casing
36: support column or wall plate
37: opening
38: separation liquid discharge pipe
41A, 41B, 42A, 42B: annular slide plate
43a, 43b, 43c, 43d: convex
44a, 44b, 44c, 44d: recesses
50: dewatering system
51: control device
51x: rotation control
51y: back pressure control unit
51z: mesh control
52: moisture content meter (concentration meter)
53: drive device
54: introduction tube
54a: introduction hole
55: casing
56: screw shaft
57 : screw wing
58: occlusion plate
59: back pressure plate
60: separation liquid discharge pipe
61: dewatered sludge discharge pipe
61a: discharge hole
80: thickening device (conventional thickening device, constant mesh size)
81: reservoir
82: mixing tank for dehydration
83: drug supply device
84: condensing agent supply device
91A, 92A: annular slide plate (third limiting part, annular plate member)
91B, 92B: annular slide plate
O: central axis

Claims (13)

A cylindrical body having a predetermined inner diameter formed by arranging a plurality of straight wire rods parallel to each other in a cylindrical shape;
a first limiting part for limiting movement of one end of each of the wire rods outward in the radial direction of the cylindrical body;
a second limiting part for limiting movement of the one end of each wire rod inward in the radial direction of the cylindrical body;
a third limiting part for limiting movement of the other end of each wire rod outward in the radial direction of the cylindrical body;
a fourth limiting part for limiting the movement of the other end of the respective wire rod in the radial direction of the cylindrical body;
an annular slide portion disposed in the vicinity of the one end of the cylindrical body and concentric with the central axis of the cylindrical body;
a control device for rotating the annular slide part about the central axis;
The radially inner shape of the annular slide portion is a shape in which a plurality of convex portions of the same shape protruded toward the central axis and a plurality of concave portions of the same shape formed concavely are alternately and regularly connected in the circumferential direction,
The number of the convex portions is the same as the number of the wire rods,
The control device is configured to rotate the annular slide part in a state where the predetermined inner diameter of the cylindrical body is maintained at the other end by the third limiting part and the fourth limiting part, so that a space between the adjacent two wire rods is provided. A screen device capable of enlarging the size of the mesh at one end to be formed from the size of the mesh at the other end formed between the two adjacent wire rods at the other end. The method of claim 1,
The annular slide portion is formed integrally with the first limiting portion and includes two annular slide plates having the same shape as each other and disposed on the outer periphery of the cylindrical body;
The third limiting portion is an annular plate member disposed on the outer periphery of the cylindrical body,
Both the second limiting part and the fourth limiting part are annular springs that urge the wire rod outward in the radial direction of the cylindrical body,
The control device forms a dent in the recesses of the two annular slide plates by rotating the two annular slide plates in opposite directions to each other, and the urging force of the second limiting portion causes the wire rod to diameter toward the dimples. A screen device for enlarging the size of the mesh on the one end side by moving it outward in the direction. The method of claim 1,
The cylindrical body is rotatable around the central axis while further comprising a second straight wire disposed between each of the adjacent two wire rods,
The annular slide unit includes two annular slide plates having the same shape as each other and disposed on the outer periphery of the cylindrical body;
The first limiting part is a first fixing plate integrally formed with the second limiting part, maintaining the distance between the ends of the adjacent two wire rods at a predetermined distance and fixing immovably,
The third limiting part is a second fixing plate integrally formed with the fourth limiting part, maintaining the distance between the other ends of the two adjacent wire rods at the predetermined distance and fixing immovably,
The second wire rod is formed in a cross-sectional shape or dimension that does not protrude between two adjacent wire rods inward in the radial direction of the cylindrical body,
The control device forms a dent in the recesses of the two annular slide plates by rotating the two annular slide plates in opposite directions to each other, and moves the second wire rod radially outward toward the dents by gravity or centrifugal force. A screen device for enlarging the size of the mesh at one end by moving it. The method of claim 1,
The annular slide part is formed integrally with the first limiting part,
The second limiting portion is an annular plate concentric with the central axis,
The shape of the radially outer side of the annular plate corresponds to the radially inner side of the annular slide part in a one-to-one correspondence,
The annular slide part and the annular plate are arranged to form a groove-like space of the same width in the circumferential direction in a radially inner end surface of the annular slide part and a radially outer end surface of the annular plate,
and the control device moves the wire rod along the groove-like space by rotating the annular slide part and the annular plate at the same speed and in the same direction to change the size of the mesh on the one end side. The method of claim 1,
and an annular plate disposed in the vicinity of the one end of the cylindrical body and concentric with the central axis;
The cylindrical body further includes a linear second wire disposed between each of the adjacent two wire rods,
The first limiting part is a first fixing plate integrally formed with the second limiting part, maintaining the distance between the ends of the adjacent two wire rods at a predetermined distance and fixing immovably,
The third limiting part is a second fixing plate integrally formed with the fourth limiting part, maintaining the distance between the other ends of the adjacent two wire rods at the predetermined distance and fixing immovably,
The second wire rod is formed in a cross-sectional shape or dimension that does not protrude between the two adjacent wire rods inward in the radial direction of the cylindrical body,
The shape of the radially outer side of the annular plate corresponds to the radially inner side of the annular slide part in a one-to-one correspondence,
The annular slide part and the annular plate are arranged so as to form a groove-like space of the same width in the circumferential direction with a radially inner end face of the annular slide part and a radially outer end surface of the annular plate,
and the control device moves the second wire along the groove-like space by rotating the annular slide part and the annular plate at the same speed and in the same direction to change the size of the mesh on the one end side. 5. The method of any one of claims 1, 2 and 4,
It further has an end plate disposed in the vicinity of the one end of the cylindrical body,
The end plate is provided with a guide hole of a predetermined length formed to correspond to the position of each wire rod and extending radially from the central axis of the cylindrical body,
A screen device in which the control device moves the one end of the wire rod along the corresponding guide hole by rotating the annular slide part. 6. The method according to any one of claims 3 and 5,
It further has an end plate disposed in the vicinity of the one end of the cylindrical body,
The end plate is provided with a guide hole of a predetermined length formed corresponding to the position of each of the second wire rod and extending radially from the central axis of the cylindrical body,
A screen device in which the control device moves the second wire along the corresponding guide hole by rotating the annular slide part. 8. The method according to any one of claims 1 to 7,
The said shape inside the radial direction of the said annular slide part is a shape along a trochoidal curve. The screen device according to any one of claims 1 to 8, wherein the central axis is arranged substantially horizontally;
a driving device for rotating the cylindrical body of the screen device around the central axis;
an inlet pipe for supplying the liquid to be treated from the other end of the screen device to the inside of the cylindrical body;
having a concentration meter for measuring the concentration of concentrated sludge discharged from the one end of the screen device,
The control device of the screen device changes the size of the mesh according to the concentration output by the concentration meter. The screen device according to any one of claims 1 to 8, wherein the central axis is arranged substantially horizontally;
an inlet pipe for supplying an object to be treated into the cylindrical body from the one end of the screen device;
a screw shaft disposed inside the cylindrical body and disposed on the central shaft to transport the object to be processed from the one end to the other end;
Having a moisture content measuring device that measures the moisture content of the dehydrated sludge discharged from the other end,
The control device of the screen device changes the size of the mesh according to the moisture content output by the moisture content meter. A water treatment system for treating sludge, excreta, or a mixture of sludge and excrement, and concentrating and dehydrating the treatment target, the water treatment system comprising:
a mixing tank for supplying and mixing and coagulating at least one of a dehydration aid, a metal removal agent, and a coagulant to the treatment target;
a concentrating device receiving the liquid stored in the mixing tank and discharging the concentrated sludge in which the liquid is concentrated;
The water treatment system which has the dehydration system of Claim 10 which introduce|transduces the said concentrated sludge into the inside of the said cylindrical body as said to-be-processed object. A water treatment system for treating sludge, excreta, or a mixture of sludge and excrement, and concentrating and dehydrating the treatment target, the water treatment system comprising:
a mixing tank for supplying and mixing and coagulating at least one of a dehydration aid, a metal removal agent, and a coagulant to the treatment target;
a concentrating device receiving the liquid stored in the mixing tank and discharging the concentrated sludge in which the liquid is concentrated;
a mixing tank for dehydration that receives the concentrated sludge and mixes at least one of a metal removal agent and a coagulant;
The water treatment system which has the dehydration system of Claim 10 which introduces the liquid stored in the said mixing tank for dehydration into the inside of the said cylindrical body as said to-be-processed object. A water treatment system for treating sludge, excreta, or a mixture of sludge and excrement, and concentrating and dehydrating the treatment target, the water treatment system comprising:
a mixing tank for supplying and mixing and coagulating at least one of a dehydration aid, a metal removal agent, and a coagulant to the treatment target;
The concentration system according to claim 9, wherein the liquid stored in the mixing tank is introduced therein as the liquid to be treated;
The water treatment system which has the dehydration system of Claim 10 which introduce|transduces the said concentrated sludge discharged|emitted by the said concentration system into the inside as the said to-be-processed object.

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