JP5972738B2 - Screw press dehydrator - Google Patents

Description

  The present invention relates to a screw press dewatering device including a cylindrical filter body in which a plurality of holes are formed, and a screw rotatably provided inside the filter body.

  Conventionally, sludge such as sewage with high moisture content or factory effluent (treatment object) is put into the inside of a cylindrical filter body, and the screw provided inside the filter body is rotated to treat the treatment object. A screw press dewatering device is used which performs filtration and dewatering while transporting the water.

  In the screw press dewatering device, a cylindrical screen made of a mesh or punching plate having a large number of holes (filter holes) formed on the outer peripheral surface is used as a filter for filtering and dewatering an object to be treated such as sludge. It is common (see, for example, Patent Document 1).

JP-A-8-309589

  In the screw press dewatering apparatus as described above, only the separated liquid separated from the object to be treated needs to be drained from the hole, and the solid content needs to remain inside the filter body. The formed hole is set to a minute opening that allows only the separated liquid to pass without passing through the solid content. For this reason, removing solids such as sludge clogged in the fine pores of the filter body is very troublesome, and in order to remove the solids clogged in the pores, the dehydrator must be operated. It is necessary to carry out maintenance with extensive cleaning and extensive cleaning.

  The present invention has been made in consideration of the above-mentioned conventional problems, and provides a screw press dewatering device that can easily remove clogging at the hole formed in the filter body and improve maintainability. The purpose is to do.

  A screw press dewatering apparatus according to the present invention includes a cylindrical filter body having a plurality of holes formed therein, and a screw rotatably provided inside the filter body, and is charged into the filter body. A screw press dewatering device that conveys the treated object from one end side to the other end side of the screw by rotation of the screw and simultaneously performs filtration dewatering by the filter body, the opening of the hole being variable. It is characterized by being.

  According to such a configuration, the degree of opening of a plurality of openings formed in the filter body is variable, so that the degree of opening of the hole is narrowed during dehydration operation, thereby allowing the solid content of the object to be processed to pass through. Without being able to smoothly discharge only the separated liquid, widening the opening of the hole at the time of operation stop or maintenance, it is possible to easily remove the solid content clogged in the hole, Maintainability can be improved.

  The filter body is formed by a plurality of plates arranged along the circumferential direction while being supported by a rotating shaft parallel to the axial direction of the screw, and a part of each adjacent plate is circumferentially arranged. When the hole is formed by a gap between the stacked plates, the opening degree of the hole can be easily varied by rotating the plate with a rotating shaft. . Moreover, by using a plate, compared with the structure using the screen like the past, the abrasion of a filter body can be reduced and the lifetime of a filter body can be extended.

  Each of the plates is stacked in order toward the rotation direction of the screw, and the hole portion is open in a direction from the inside to the outside of the filter body and in a direction opposite to the rotation direction of the screw. In addition, it is possible to suppress clogging of the solid content of the processing object into the hole portion and discharge of the solid content from the hole portion to the outside. Moreover, the liquid content of the processing object pressed against the inner surface of the plate and simultaneously squeezed by reducing the inner volume of the filter can be smoothly discharged from the hole to the outside, and high dewatering performance can be obtained. it can.

  When the plate is pivotally supported by the rotating shaft in a freely rotating state, the opening of the hole is narrowed by the pressure from the object to be processed during the dehydration operation, while the pressure is reduced during the operation stop. Since it does not act and the opening of the hole becomes wider, the solid matter clogged in the hole can be easily removed.

  The plate may be provided with a spacer that regulates the height of the gap by contacting the surface of an adjacent plate. If it does so, the opposing surfaces of a plate will closely_contact | adhere and it can prevent reliably that a hole is obstruct | occluded.

  In this case, if the spacer is detachable from the plate, the opening degree of the hole can be easily defined and controlled simply by replacing the spacer with one having a desired height. It is possible to easily form a hole having an optimum opening degree according to the property of the object to be treated, the amount of treatment, and the like.

  Moreover, you may provide the positioning means which positions the rotation phase of the said plate by the said rotating shaft. As a result, it is possible to easily form a filtration hole with an optimum opening according to the properties of the object to be treated, the amount of treatment, etc. When the operation is stopped, the opening of the hole can be widened and reliably held.

  According to the present invention, the opening of the plurality of openings formed in the filter body is variable, so that the opening of the hole is narrowed during the dehydration operation, so that the solid content of the object to be treated is not passed. While only the separated liquid can be discharged smoothly, the solid content in the hole can be easily removed by widening the opening of the hole when the operation is stopped or during maintenance. Can be improved.

FIG. 1 is an overall configuration diagram of a screw press dewatering apparatus according to an embodiment of the present invention. FIG. 2 is a partially omitted perspective view of the filter body. FIG. 3 is a configuration diagram of the filter body as viewed from the front side. FIG. 4 is an operation explanatory view of each plate constituting the filter body, and FIG. 4 (A) is an explanatory view showing an example of the state of each plate when the dehydrating apparatus is in a stopped state. B) is an explanatory view showing an example of the state of each plate when the dehydrator is in an operating state. FIG. 5 is a partially omitted plan view showing a modified example of the plate. FIG. 6 is a partially omitted perspective view showing a modified example of the filter body. FIG. 7 is an operation explanatory view of each plate constituting the filter body shown in FIG. 6, and FIG. 7 (A) is an explanatory view showing an example of the state of each plate when the dehydrator is in a stopped state. FIG. 7B is an explanatory diagram showing an example of the state of each plate when the dehydrator is in an operating state. FIG. 8 is a perspective view showing a modification of the filter body. FIG. 9 is an explanatory diagram showing the configuration of the filter holes of the filter body shown in FIG. 8, and FIG. 9 (A) is an explanatory diagram in a state where the filter holes of the outer cylinder and the inner cylinder are overlapped and communicated with each other. FIG. 9B is an explanatory diagram in a state where the inner cylinder is moved from the state shown in FIG.

  Hereinafter, preferred embodiments of a screw press dehydrating apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an overall configuration diagram of a screw press dehydrating apparatus 10 according to an embodiment of the present invention, and is a side view partially showing a cross section. The screw press dehydrating apparatus 10 (hereinafter also simply referred to as “dehydrating apparatus 10”) according to the present embodiment is configured to remove a processing object such as sewage sludge that has been introduced into a cylindrical filter body 12 by rotating the screw 14. At the same time as being transported, the filter 12 dehydrates and discharges as a dehydrated cake, and can be used not only as a dehydrator but also as a concentrator.

  As shown in FIG. 1, the dehydrating apparatus 10 includes a cylindrical filter body 12 and a screw 14 that is rotatably provided inside the filter body 12, and is connected to the inlet 16 on one end side of the filter body 12. An object to be processed that has been put into the filter body 12 is filtered and dehydrated while being conveyed to the other end side by the rotational force of the screw 14, and the dehydrated cake that is the object to be processed after dehydration is discharged from the discharge port 18. It is.

  The screw 14 extends coaxially with the axial center of the filter body 12, and has a screw shaft 20 that gradually increases in diameter from one end side (input port 16 side) toward the other end side (discharge port 18), and the screw shaft 20. And the screw blades 22 provided in a spiral shape on the outer peripheral surface.

  Both ends of the screw shaft 20 are supported by bearings 24a and 24b, for example, and can be rotated by a rotational driving force from a driving device 26 (for example, a motor) provided on one end side. Since the screw shaft 20 has a tapered shape that gradually increases in diameter from one end side to the other end side as described above, the screw shaft 20 is formed between the outer peripheral surface of the screw shaft 20 and the inner peripheral surface of the filter body 12. The space is gradually narrowed from one end side (upstream side) to the other end side (downstream side), thereby compressing and dewatering the processing object.

  A taper cone 28 is provided on the other end side of the screw shaft 20 to further compact the object to be treated that has been pressure-dehydrated inside the filter body 12. The tapered cone 28 is provided on the outer peripheral surface of the screw shaft 20 so as to be coaxial with the screw shaft 20 and has an inclined surface 28 a that expands in diameter at a larger inclination angle than the screw shaft 20. For example, the taper cone 28 is extrapolated on the outer peripheral surface of the screw shaft 20 so as to be movable in the axial direction, and is biased toward the filter body 12 by a pressurizing device such as a hydraulic cylinder or an air cylinder (not shown).

  FIG. 2 is a partially omitted perspective view of the filter body 12. For the sake of simplicity, only a part of the plate 30 that is arranged in the circumferential direction and forms the outer peripheral surface of the filter body 12 is illustrated. Is. Moreover, FIG. 3 is the block diagram which looked at the filter body 12 from the front side.

  As shown in FIGS. 1 to 3, the filter body 12 includes a support plate 32 through which one end side (small diameter side) of the screw 14 is inserted, and a support plate through which the other end side (large diameter side) of the screw 14 is inserted. 34, and a plurality of plates 30 (14 configurations are illustrated in FIG. 3) are arranged between the support plates 32, 34 along the circumferential direction thereof, and the outer peripheral surface of the filter body 12 by each plate 30. Is formed. The filter body 12 is fixed and installed on a floor surface of a factory or the like by supporting the support plates 32 and 34 by, for example, a base (not shown) fixed on the floor surface.

  The plate 30 is arranged such that its longitudinal direction is parallel to the axial direction of the screw shaft 20, and both end surfaces in the longitudinal direction are axially supported by rotating shafts 36 and 38 projecting from both inner surfaces of the support plates 32 and 34, respectively. It is supported. That is, each plate 30 is installed between the support plates 32 and 34 so as to be freely rotatable about the rotation shafts 36 and 38 as axis centers. The pair of rotating shafts 36 and 38 are provided at positions where the axial directions thereof are coaxial with each other, and the axial directions thereof are parallel to the axial direction of the screw shaft 20.

  As shown in FIGS. 2 and 3, each of such plates 30 is configured such that a part of adjacent plates 30, that is, side portions that are one end side in the short side direction, are sequentially laminated in the circumferential direction. Has been placed. By this lamination, the rotation range around the rotation shafts 36 and 38 of each plate 30 is regulated, and a gap (clearance) 40 formed between adjacent plates 30 is formed between the inner and outer surfaces of the filter body 12. It communicates and functions as a filtration hole (hole part) 40 for discharging the separated liquid (filtrate) from the processing object to the outside. Since each plate 30 is rotatable, the opening degree of the filtration hole 40 is configured to be variable, and the opening degree (the height of the gap 40 in the stacking direction of the plates 30) is, for example, 0.5 mm to 5 mm. It is set to a range of about. Thus, the filter body 12 is a louver-type filter body having a louver structure by the plate 30 on which the outer peripheral surface is laminated.

  The plates 30 are made of, for example, a metal thin plate made of stainless steel or the like (eg, a plate thickness of about 2 mm), and as shown in FIG. 3, each plate 30 is rotated in the direction of rotation of the screw 14 during the dehydration operation. It is arranged so as to make one round along the circumferential direction of the support plates 32 and 34 while being laminated in order toward the front direction at A1.

  As shown in FIGS. 2 and 3, U-shaped spacers 42 are detachably attached to the end portions of the overlapping portions between the plates 30. The spacer 42 defines the height of the gap 40 (filter hole 40) by contacting the surface of the adjacent plate 30. That is, in the spacer 42, the opposing surfaces (surfaces) of the stacked plates 30 are brought into contact with and in close contact with each other by the pressing force from the processing object during the dehydrating operation of the dehydrating apparatus 10, and the filtration hole 40 is closed. To prevent it. Each plate 30 is rotatably supported by the rotation shafts 36 and 38, and swings by the pressing force from the object to be processed. Therefore, the filtration holes 40 can be sufficiently secured without installing the spacers 42. Although it is possible, by providing the spacer 42, the filtration hole 40 can be ensured more reliably, and it can be defined to a desired opening degree (opening size).

  The rotating shaft 36 is a pin-shaped fixed shaft that protrudes in the vicinity of the outer edge of the inner surface of the support plate 32 and has a plurality (the same number as the number of installed plates 30) arranged in the circumferential direction. Similarly, the rotating shaft 38 is a pin-shaped fixed shaft that protrudes in the vicinity of the outer edge of the inner surface of the support plate 34 and has a plurality (the same number as the number of plates 30) arranged in the circumferential direction.

  The tip of the rotating shaft 36 is inserted in a rotatable state into a shaft hole 44 formed in one end surface of the plate 30 in the longitudinal direction, and the tip of the rotating shaft 38 is formed in the other end surface of the plate 30 in the longitudinal direction. By being inserted into the shaft hole 46 in a rotatable state, the plate 30 is rotatably supported between the opposing surfaces of the support plates 32 and 34 by the respective rotation shafts 36 and 38. In the present embodiment, the configuration in which the shaft holes 44 and 46 into which the rotary shafts 36 and 38 are inserted is formed at the center of the end surface of the plate 30 (see FIG. 3 and the like). May be provided at a position closer to both end sides than the center in the longitudinal direction of the end face.

  The rotary shafts 36 and 38 may be rotatably inserted into shaft holes (not shown) formed in the support plates 32 and 34 while being fixed to the respective end faces of the plate 30. In addition, a configuration in which shaft holes (not shown) are provided in each end surface of the plate 30 and inner surfaces of the respective support plates 32 and 34, and both ends of the rotary shafts 36 and 38 are inserted into the respective shaft holes in a rotatable state. It may be.

  As shown in FIG. 1, the input port 16 through which the object to be processed is introduced into the filter body 12 is provided in a funnel shape above the one end side of the filter body 12. In FIG. 1, the inlet 16 is illustrated by a two-dot chain line for the sake of simplicity of drawing, but the inlet 16 is, for example, the longitudinal length of several plates 30 positioned at the upper part of the cylinder of the filter body 12. The length in the direction may be shorter than that of the other plate 30 and may be installed in the opening formed thereby. In this case, the rotating shaft 36 that pivotally supports the several plates 30 formed in the shorter length. May be supported by the side surface of the insertion port 16 or a predetermined bracket or the like installed on the side surface. Of course, the installation place of the insertion port 16 may be a position other than the upper part of the cylinder of the filter body 12. For example, an opening (not shown) is formed in the support plate 32 so as to be connected to the opening. Also good.

  On the other hand, as shown in FIG. 1, the discharge port 18 is formed between the inclined surface 28 a of the tapered cone 28 continuing from the outer peripheral surface whose diameter is increased on the downstream side of the screw shaft 20 and the opening 34 a of the support plate 34. It is formed by an annular gap.

  Next, the operation of the screw press dewatering apparatus 10 configured as described above will be described mainly with reference to FIG.

  FIG. 4 is an operation explanatory view of each plate 30 constituting the filter body 12, and FIG. 4A is an explanatory view showing an example of the state of each plate 30 when the dehydrating apparatus 10 is in a stopped state. FIG. 4B is an explanatory diagram showing an example of the state of each plate 30 when the dehydrating apparatus 10 is in an operating state.

  First, in a state where the screw 14 is rotationally driven by the driving device 26, a treatment object containing moisture such as sewage sludge is introduced into the filter body 12 from the introduction port 16. When sludge is used as the object to be treated, the sludge is preferably introduced into the filter body 12 as agglomerated sludge mixed with a predetermined aggregating agent in an agglomeration mixing tank (not shown).

  The processing object thrown into the filter body 12 is pressed against the inner peripheral surface of the filter body 12, that is, the inner surface of each plate 30 aligned in the circumferential direction while receiving a rotational force by the screw blades 22 of the rotating screw 14. Thus, it is conveyed toward the discharge port 18 and is simultaneously filtered and dehydrated by the filter body 12.

  Since no external force is applied to each plate 30 before the dehydration operation is started, the rotation phase of each plate 30 around the rotation shafts 36 and 38 is in a free position. For this reason, the gap 40 (filter hole 40) between the plates 30 is in a state having a certain degree of opening, as shown in FIG. 4A, for example.

  On the other hand, when the screw 14 is rotationally driven and the dehydration operation of the object to be processed is started, as shown in FIG. 4B, the screw blade 22 is rotated in the rotational direction A1, and the helical screw is rotated. In response to the rotational force from the blades 22, the object to be treated moves outward in the diameter direction of the filter body 12 while moving at a speed slightly slower than the rotational speed of the screw 14 in the same movement direction A2 as the rotation direction A1. Is pressed against the inner surface of the plate 30 by the pressing force P in the direction toward the pressure and dehydrated under pressure. At this time, the processing object receives the moving force and the pressing force P in the moving direction A2, and on the inner surface of the plate 30, the downstream portion 30a located on the downstream side in the moving direction A2 with respect to the rotating shafts 36 and 38. The inner surface of the plate 30 is strongly pressed, and the plate 30 is rotated counterclockwise (see arrow θ) in FIG. 4B.

  That is, during the dehydration operation, all the plates 30 are subjected to the rotational force in the same direction (arrow θ direction) by the processing object, so that each plate 30 moves in the moving direction A2 of the processing object with respect to the rotation shafts 36 and 38. The spacer 42 provided in the upstream portion 30b on the upstream side is in contact with the outer surface of the downstream portion 30a of the adjacent plate 30 in an overlapping manner, and the filtration is uniformly defined by the height of the spacer 42. A plurality of holes 40 (gap 40) are formed.

  As shown in FIG. 4 (B), the filtration hole 40 with the opening degree defined in this way is a direction from the inner side to the outer side of the filter body 12, and the rotation direction A1 of the screw 14 (the moving direction A2 of the processing object). ) And open in the opposite direction. For this reason, it is pressed against the inner surface of the plate 30 with the pressing force P while suppressing the solid content of the object to be processed in the filtration hole 40 and the solid content being discharged from the filtration hole 40 to the outside. At the same time, the liquid component (separated liquid) of the processing object squeezed by reducing the internal volume of the filter body 12 can be smoothly discharged to the outside (see arrow L in FIG. 4B).

  As described above, the processing object thrown into the filter body 12 is concentrated by receiving the filtration dehydration through the filter holes 40 of each plate 30 constituting the filter body 12 while being transported inside the filter body 12. Is discharged from the discharge port 18 to the outside as a dehydrated cake.

  In the dehydrating apparatus 10, when the dehydration operation of the predetermined amount of the processing object is completed and the rotation of the screw 14 is stopped, the pressing force P (see FIG. 4B) from the processing object to each plate 30 is applied. Each plate 30 becomes free to rotate around the rotation shafts 36 and 38 again, and the opening degree of the filtration hole 40 is also enlarged (see FIG. 4A). For this reason, even if solid matter or the like is clogged in the filtration hole 40 during the dehydration operation, the solid matter is easily dropped from the filtration hole 40 due to the increase in the opening degree of the filtration hole 40. Maintenance operations to remove clogging such as screens can be eliminated or greatly reduced. During this maintenance, when the screw 14 is rotated in the reverse direction, each plate 30 is rotated in the reverse direction, and the opening degree of the filtration hole 40 varies, so that the clogged solid matter can be more reliably dropped.

  In the dehydration apparatus 10, when clogging such as solid content in the filtration hole 40 occurs during the dehydration operation, the dehydration operation is temporarily stopped and the processing object remains in the interior. Thus, by stopping or reversely rotating the screw 14, it is possible to easily remove the clogged solids and immediately restart the dehydration operation. In other words, when the screw 14 is stopped or rotated at a predetermined timing, for example, once a day, clogging in the filtration hole 40 can be periodically removed, so that it is substantially maintenance-free. In such a state, the dehydrating apparatus 10 can be operated.

  As described above, according to the screw press dewatering device 10 according to the present embodiment, the opening degree of the filter holes 40 formed in the filter body 12 is variable, so that the opening degree of the filter holes 40 during the dehydration operation is variable. By narrowing the filter hole, it is possible to smoothly discharge only the separated liquid without passing through the solid content of the object to be treated. On the other hand, by widening the opening of the filter hole 40 at the time of operation stop or maintenance, the filter hole The solid content and the like packed in 40 can be easily removed, the maintainability is improved, and the overhaul cost and the like can be reduced.

  In the screw press dewatering device 10, the filter body 12 is formed by a plurality of plates 30 arranged along the circumferential direction while being supported by rotating shafts 36 and 38 parallel to the axial direction of the screw 14. In addition, a part of each adjacent plate 30 is installed so as to be sequentially stacked in the circumferential direction, and the filtration hole 40 is formed by a gap 40 between the stacked plates 30. Thereby, the opening degree of the filtration hole 40 can be easily changed by rotating the plate 30 by the rotating shafts 36 and 38. Moreover, compared with the structure using the screen like the past, the plate 30 with sufficient thickness can be used, the wear of the filter body 12 can be reduced, and the lifetime of the filter body 12 can be extended. The exchange cycle can be extended.

  In this case, the plates 30 are stacked in order toward the rotation direction A1 of the screw 14, so that the filtration holes 40 are directed from the inside to the outside of the filter body 12, and the rotation direction A1 of the screw 14 (processing target). It opens in the direction opposite to the moving direction A2) of the object. Therefore, during the dehydration operation, it is possible to prevent the solid content of the processing object from being clogged in the filtration hole 40 and to discharge the solid content from the filtration hole 40 to the outside. Since the liquid component (separated liquid) of the processing object pressed by the pressure P and simultaneously squeezed by reducing the internal volume of the filter body 12 can be smoothly discharged to the outside, high dehydration performance can be obtained. it can.

  The plate 30 is composed of a single plate extending between the support plates 32 and 34 as described above. For example, as shown in FIG. 5, several plates 50 (three in FIG. For example, the configuration may be a configuration in which the plates 50 are connected to each other by a rotary shaft 52 so as to be rotatable.

  Since the plate 30 is pivotally supported by the rotary shafts 36 and 38 in a freely rotating state, the opening of the filter hole 40 is narrowed by the pressure from the processing object during the dehydration operation, and when the operation is stopped. Since the pressure does not act, the opening degree of the filtration hole 40 is widened, so that the solid matter clogged in the filtration hole 40 can be easily removed.

  Further, when the spacer 42 is configured to be detachable from the plate 30, the opening degree of the filtration hole 40 can be easily defined and controlled simply by replacing the spacer 42 with a desired height. It is possible to easily form the filtration hole 40 having an optimum opening degree according to the properties of the object to be processed, the processing amount, and the like.

  The plate 30 may have a configuration other than the configuration that is freely supported as described above. For example, the plate 30 may have a configuration that can be positioned (fixed) at a desired rotation angle (rotation phase).

  6 and 7 show a configuration example of the filter body 12a provided with the positioning means for the plate 30. FIG. As shown in FIGS. 6 and 7, the filter body 12 a has a ring member 39 that opens at the approximate center on one end side of each plate 30 so as to face the circumferential direction of the filter body 12 a. Wires 41 are sequentially inserted through the ring members 39 of the plates 30 along the circumferential direction of the filter body 12 a, and both ends of the wires 41 are collected and wound around a winding roll 43. The wire 41 may be replaced by a chain or the like.

  In the filter body 12a, the wire 41 can be wound up and sent out by controlling the rotation direction of the hoisting roll 43. Then, by changing the diameter of the circle formed by the wire 41, each plate 30 can be rotated about the rotation shafts 36 and 38, and the rotation phase, that is, the opening degree of the filtration hole 40 can be controlled. Although FIG. 6 illustrates a configuration using only one wire 41, a configuration in which a plurality of ring members 39 are installed in the longitudinal direction of the plate 30 and a plurality of wires 41 are used may be employed. In the case of a configuration in which several plates 50 are arranged as shown in FIG. 5, the ring member 39 and the wire 41 may be installed on each plate 50.

  Before starting the operation of the dehydrator 10 using such a filter body 12a, by driving the hoisting roll 43 and feeding out the wire 41, the gap 40 (filter hole 40) between the plates 30 is For example, as shown in FIG. 7A, it can be in a state having a certain degree of opening. On the other hand, during operation, the hoisting roll 43 is driven in the reverse direction to wind up the wire 41, so that the gaps 40 (filtration holes 40) between the plates 30 are, for example, as shown in FIG. And the opening degree at which the spacer 42 provided in the upstream portion 30b on the upstream side in the moving direction A2 of the processing object with respect to the rotation shafts 36 and 38 is in contact with the outer surface of the downstream portion 30a of the adjacent plate 30 in an overlapping manner. Can be regulated.

  Then, when the predetermined dehydration operation is completed and the rotation of the screw 14 is stopped, the hoisting roll 43 is again driven to send out the wire 41 and the opening degree of the filtration hole 40 is increased (see FIG. 7A). As a result, even if solid matter or the like is clogged in the filtration hole 40 during operation, the solid matter easily drops from the filtration hole 40 due to the increase in the opening of the filtration hole 40.

  As described above, the filter body 12a includes the ring member 39, the wire 41, and the hoisting roll 43 as positioning means for positioning the rotational phase of the plate 30 by the rotary shafts 36 and 38, so that the filter 12a can be operated and stopped. The positioning of the rotational phase of the plate 30, that is, the opening degree of the filtration hole 40 can be controlled. As a result, it is possible to easily form the filtration hole 40 having an optimum opening degree according to the properties of the object to be treated, the processing amount, and the like. For example, during the dehydration operation, the opening degree of the hole part is narrowed and securely held. When the operation is stopped, the opening of the hole can be widened and reliably held. Moreover, since such a positioning means is used to prevent the filtration hole 40 from being blocked, the spacer 42 can be omitted. The positioning means for the plate 30 may have other configurations, for example, a motor or the like that can individually control the rotation phase around the rotation shafts 36 and 38 of each plate 30 may be used.

  As an example of the positioning means, a fixing means (not shown) capable of fixing the freely rotatable plate 30 at a desired rotation angle (rotation phase) about the rotation shafts 36 and 38 may be provided. As this fixing means, for example, a lock member that locks the rotation of the rotary shafts 36 and 38, a structure in which the spacers 42 are connected to each other, and a plurality of plates 30 that are connected to each other to fix the rotation phase, etc. Can be used. By using such a fixing means, the opening degree of the filtration hole 40 can be narrowed and reliably held during dehydration operation, and the opening degree of the filtration hole 40 can be widened and reliably held when the operation is stopped. It is possible to keep.

  As a structure which makes the opening degree of the filtration hole 40 formed in the outer peripheral surface of the filter body 12 variable, other than the filter body 12 using the said plate 30 may be sufficient, for example, the filtration shown in FIG.8 and FIG.9. The body 60 may be configured.

  As shown in FIGS. 8 and 9, the filter body 60 has a configuration in which a cylindrical screen using a mesh, a punching plate, or the like is installed as a filter body as a conventional configuration as a concentric double tube. An outer cylinder 64 having a plurality of apertures (holes) 62 and an inner cylinder 68 concentrically arranged on the inner surface side of the outer cylinder 64 and having a plurality of apertures (holes) 66 formed therein. ing. In FIG. 8, only a part of the filtration holes 62 and 66 is shown for the sake of simplicity, but in actuality, the filtration holes 62 and 66 are all circumferential surfaces of the outer cylinder 64 and the inner cylinder 68. An opening is formed over.

  As shown in FIG. 9 (A), in the filter body 60, when the operation is stopped, the filter holes 62 and 66 of the outer cylinder 64 and the inner cylinder 68 are arranged at positions where they overlap each other and communicate with each other. Filter holes can be formed. On the other hand, as shown in FIG. 9B, during the dehydration operation, one of the outer cylinder 64 and the inner cylinder 68 (inner cylinder 68 in FIG. 9B) is moved in the circumferential direction (or axial direction). Since the positions of the filtration holes 62 and 66 are shifted, only the narrow opening region R communicating with each other can function as a filtration hole.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be freely changed without departing from the gist of the present invention.

  For example, in the above embodiment, the U-shaped spacer 42 is illustrated, but the shape of the spacer 42 is not particularly limited, and for example, a protrusion or the like may be provided by a detachable bolt or the like on the inner surface or outer surface of the plate 30. Furthermore, unevenness may be provided on the surface of the plate 30 itself.

DESCRIPTION OF SYMBOLS 10 Screw press dehydrator 12, 12a, 60 Filter body 14 Screw 20 Screw shaft 22 Screw blade 30 Plate 32, 34 Support plate 36, 38 Rotating shaft 39 Ring member 40 Gap, Filtration hole 41 Wire 42 Spacer 43 Hoisting roll 62, 66 Filtration hole

Claims (5)

A cylindrical filter body having a plurality of holes formed therein, and a screw rotatably provided inside the filter body, and a processing object thrown into the filter body, A screw press dewatering device that conveys from one end side of the screw to the other end side by rotation and simultaneously performs filtration dewatering by the filter body,
Ri opening variable der of the hole,
The filter body is formed by a plurality of plates arranged along the circumferential direction while being supported by a rotating shaft parallel to the axial direction of the screw, and a part of each adjacent plate is circumferentially arranged. Installed in order,
The screw press dewatering device , wherein the hole is formed by a gap between the stacked plates . The screw press dewatering device according to claim 1 ,
Each of the plates is sequentially stacked in the direction of rotation of the screw,
The screw press dewatering device, wherein the hole is open in a direction from the inner side to the outer side of the filter body and in a direction opposite to a rotation direction of the screw. The screw press dewatering device according to claim 1 or 2 ,
The screw press dewatering device, wherein the plate is pivotally supported by the rotary shaft in a freely rotatable state. In the screw press dehydration device according to any one of claims 1 to 3 ,
The screw press dewatering device, wherein the plate is provided with a spacer that defines a height of the gap by contacting a surface of an adjacent plate. The screw press dewatering device according to claim 4 ,
The screw press dewatering apparatus, wherein the spacer is detachable from the plate.

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