JP5767087B2 - Dehydrator - Google Patents

Description

  The present invention relates to a dehydrating apparatus that dehydrates a processing object such as sludge while conveying it with an endless filter body.

  Conventionally, centrifugal type, belt press type, screw type, etc. have been used as escape devices for dewatering sludges such as sewage and industrial wastewater, which are objects to be treated, of which belt type (belt press) The dewatering device has low power consumption and is generally excellent in sludge dewatering.

  For example, in Patent Document 1, pressure dewatering is performed between endlessly configured filter cloth belts that move around, and sludge is pressure dehydrated between filter cloth belts in a belt press dewatering device that reduces the water content. There is disclosed a configuration including a secondary dewatering unit and a secondary dewatering unit that further dewaters the sludge dehydrated in the primary dewatering unit using a filter cloth belt and a pressing roller.

JP 61-42312 A

  By the way, in the belt press dewatering device described above, a processing object such as sludge is pressurized using an endlessly configured filter cloth belt, and the separated liquid component (separated liquid) is minutely formed on the filter cloth belt. Filter dewatering by discharging to the outside through a simple hole (filter hole). For this reason, it is impossible to prevent clogging of the object to be processed into the minute filtration hole, and in order to remove this clogging, a large-scale cleaning work is necessary, and the labor and cost required for the maintenance work are reduced. It was also large, and regular replacement of the filter cloth belt was necessary.

  The present invention has been made in consideration of the above-described conventional problems, and an object of the present invention is to provide a dehydrating apparatus capable of reducing clogging in a filter body and improving maintainability.

A dehydrating apparatus according to the present invention is a dehydrating apparatus that dehydrates a traveling object that is transported by the filter body by running an endless filter body, and the filter body has a traveling direction thereof. It is in a state of being pivotally supported by the direction of rotation axis perpendicular composed of a plurality of plates arranged along the travel direction, is provided as part of each adjacent plate are stacked in this order in the traveling direction And the separation liquid from the processing object is discharged to the outside through a gap formed between the adjacent plates, and the plate comes into contact with the surface of the adjacent plate by contacting the plate. A spacer for defining the height of the gap formed between adjacent plates is provided .

According to such a configuration, a plurality of plates pivotally supported by the rotating shaft are sequentially stacked to form a filter body, and a processing object such as sludge is dehydrated with this filter body. Thus, it is possible to discharge the gaps by using as the filter pore into smooth outside separated liquid between the plates. In addition, since the opening of the filter holes between the plates widens at the part where the orbit of the filter body is greatly bent, the solid matter etc. clogged in the filter holes are removed and removed, so that the filter body is not clogged. Can be reduced and maintainability can be improved.

  The plate may be pivotally supported by the rotation shaft in a freely rotatable state. Then, during the dehydration operation, the opening of the filtration hole is narrowed by the pressure from the object to be processed, and only the separation liquid is smoothly discharged.On the other hand, when the trajectory of the filter body is in the folded portion or during the operation stop Since the pressure does not act, the opening degree of the filtration hole is widened, whereby the solid content clogged in the filtration hole can be easily removed.

  When the plate has walls standing up on both ends in the width direction of the conveyance surface of the processing object, the wall flows from the conveyance surface of each plate to the side in the width direction, and falls off. In order to prevent this from happening, it functions as a side surface holding plate for holding the processing object on the conveying surface of each plate arranged in an endless belt shape. Outflow can be suppressed.

Since the plate is provided with a spacer that determines the height of a gap formed between the adjacent plates by contacting the surface of the adjacent plates, the opposing surfaces of the plates are in close contact with each other, and the filtration holes Therefore, it is possible to reliably prevent the gap between the plates from being blocked.

  Further, the dewatering device includes a first loop portion that includes a pair of the filter bodies, the one filter body is looped between a plurality of rollers, and endlessly circulates, and the first loop portion. The second loop part is provided below the other filter body and is wound around the plurality of rollers so as to circulate endlessly. The upper surface portion of the first loop part gravitates the processing object. A gravity dewatering unit for dewatering is configured, and a pressure dehydrating unit for pressurizing and dehydrating the object to be processed is configured by the lower surface portion of the first loop portion and the upper surface portion of the second loop portion that are arranged to face each other. The object to be dehydrated by the gravity dehydration unit drops from the end of the first loop unit onto the upper surface portion of the second loop unit, and is then introduced into the pressure dehydration unit. Is a device configuration having a plurality of stages of dewatering units It can be made compact in the conveying direction of the processing object.

  In this case, the filter body includes a flexible member that is looped and driven between the plurality of rollers, and the plurality of plates that are pivotally supported by the rotation shaft provided on the flexible member. If it is set as the structure which has, a plate can be smoothly run by an endless track.

  According to the present invention, a filter body is formed by sequentially laminating a plurality of plates supported by a rotating shaft, and a processing object such as sludge is dehydrated by the filter body. Thereby, the separation liquid can be smoothly discharged to the outside by using the gaps between the plates as filtration holes. Moreover, since the opening of the filter holes between the plates widens at the part where the orbit of the filter body is greatly bent, the solid matter etc. clogged in the filter holes are removed and removed, so that the filter body is not clogged. Can be reduced and maintainability can be improved.

FIG. 1 is an overall configuration diagram of a dehydrating 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 front view of the dehydrating apparatus. FIG. 4 is an operation explanatory diagram of each plate constituting the filter body.

  Hereinafter, preferred embodiments of a 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 dehydrating apparatus 10 according to an embodiment of the present invention. The dehydration apparatus 10 according to the present embodiment performs a dehydration process while sequentially transporting an object to be treated such as sewage sludge through a primary dehydration unit 12 and a secondary dehydration unit 14 using a filter, and discharges the dehydrated cake. Of course, the apparatus may be used not only as a dehydrator but also as a concentrator.

  As shown in FIG. 1, the dehydrating apparatus 10 includes a primary dehydrating unit 12 that gravity dehydrates a processing object using a filter body (upper filter body, first loop unit) 16 that travels in an endless track (infinite track). A secondary dehydration unit 14 is provided that pressurizes and dehydrates the processing object dehydrated by the primary dehydration unit 12 between a filter body 16 and a filter body (lower filter body, second loop unit) 18.

  The primary dewatering unit 12 includes an endless filter body 16 that is wound around a plurality (two in this embodiment) of rollers (rolls) 20 and 22 and driven in one direction. The upper surface portion 16a inclined upward in the traveling direction (arrow A direction) of 16 functions as a gravity dewatering unit.

  FIG. 2 is a partially omitted perspective view of the filter body 16. One of the plates 24 arranged on an endless track of the filter body 16 and forming an endless belt-like outer surface (filter belt) of the filter body 16. The part is illustrated. FIG. 3 is a front view of the dehydrating apparatus 10, and is a configuration diagram in which the primary dehydrating unit 12 and the secondary dehydrating unit 14 are viewed from the roller 22 side. 4 is an operation explanatory view of each plate 24 constituting the filter bodies 16 and 18, and is a side view in which the periphery of the roller 22 is enlarged.

  As shown in FIGS. 1 to 3, the rollers 20 around which the filter body 16 is wound are a pair of disks that are provided at both ends of a thin drive shaft 26 and are rotated by the drive shaft 26. The other roller 22 is also substantially the same as the roller 20, and is a pair of disks that are respectively provided at both ends of the drive shaft 28 and rotated by the drive shaft 28. In the present embodiment, a roller 20 having a diameter larger than that of the roller 22 is used.

  As shown in FIGS. 1 to 4, the filter body 16 includes a pair of running belts 30, 30 wound between the left and right rollers 20, 22, and the running direction between the running belts 30, 30. By arranging a plurality of plates 24 (31 configurations illustrated in FIG. 1) along the (extending direction), the outer surface (outer peripheral surface) of the filter body 16 is formed by each plate 24. The traveling belt 30 is a flexible member that can be circulated around the rollers 20 and 22.

  The plate 24 is disposed in a direction in which the longitudinal direction extends between the left and right traveling belts 30, 30, that is, in a direction orthogonal to the traveling direction of the traveling belt 30, which is the conveyance direction of the object to be processed. Both end surfaces in the longitudinal direction are pivotally supported by rotating shafts 32, 32 respectively protruding from the inner surface of 30. Each plate 24 is installed between the traveling belts 30 and 30 so as to freely rotate about the rotation shaft 32 as an axis center. The pair of rotating shafts 32 and 32 are provided at positions where the axial directions thereof are coaxial with each other, and the axial direction is orthogonal to the traveling direction of the traveling belt 30.

  Each of the plates 24 is arranged such that a part of the adjacent plates 24, that is, a front part and a rear part which are one end side in the short side direction are sequentially stacked in the traveling direction. By this lamination, the rotation range around the rotation axis 32 of each plate 24 is regulated, and a gap (clearance) 34 formed between adjacent plates 24 is formed between the inner and outer surfaces of the endless belt-like filter body 16. , And functions as a filtration hole (hole) 34 for discharging the separated liquid (filtrate) from the processing target to the outside. Each plate 24 is configured such that the outlet direction of the dehydrated separation liquid is always the forward direction with respect to the moving direction of the object to be processed, and smooth drainage is ensured.

  Since each plate 24 is rotatable, the opening degree of the filtration hole 34 is configured to be variable, and the opening degree (the height of the gap 34 in the stacking direction of the plates 24) is, for example, 0.5 mm to 5 mm. It is set to a range of about. Further, the plate 24 is made of, for example, a metal thin plate made of stainless steel or the like and is a rectangular thin plate (for example, a plate thickness of about 2 mm). As shown in FIGS. 1 and 4, the plates 24 of the filter body 16 are sequentially stacked in the traveling direction A during the dehydrating operation in the forward direction, and the direction in which the traveling belt 30 is wound around the rollers 20 and 22. It arrange | positions so that it may make one round along.

  As shown in FIGS. 1 to 4, plate-like wall portions (side wall portions) 35 stand on both end sides in the width direction of the conveyance surface (outer surface) of the processing object in each plate 24. The wall 35 is an outflow prevention plate for preventing the processing object from flowing out from the conveying surface of each plate 24 in the width direction and falling off, that is, the conveying surface of each plate 24 arranged in an endless belt shape. It is a side surface holding plate for holding a processing target object on the top, and is arranged so that the side of the filter body 16 may make one round.

  As shown in FIGS. 2 to 4, a U-shaped spacer 36 is detachably attached to the end portion of the overlapping portion between the plates 24. In FIG. 1, the illustration of the spacer 36 is omitted in order to ensure the visibility of the drawing.

  The spacer 36 defines the height of the gap 34 (filter hole 34) by contacting the surface of the adjacent plate 24. That is, in the spacer 36, the opposing surfaces (surfaces) of the stacked plates 24 are brought into contact with and in close contact with each other due to the pressing force from the processing object during the dehydrating operation of the dehydrating apparatus 10, and the filtration hole 34 is closed. To prevent it. Each plate 24 is rotatably supported by a rotating shaft 32 and swings by a pressing force from the object to be processed. Therefore, the filtration hole 34 can be sufficiently secured without installing the spacer 36. However, by providing the spacer 36, the filtration hole 34 can be secured more reliably and can be defined to a desired opening degree (opening dimension).

  The rotating shaft 32 is a pin-shaped fixed shaft that protrudes from the inner surface of the traveling belt 30 and has a plurality (the same number as the number of plates 24 installed) arranged along the extending direction of the traveling belt 30. The front end of each rotating shaft 32 is inserted into a shaft hole 38 formed on each end face in the longitudinal direction of the plate 24 in a rotatable state, so that the plate 24 travels left and right by the rotating shafts 32 and 32. The belt 30 is rotatably supported between the opposing surfaces of the belt 30. In the present embodiment, the configuration in which the shaft hole 38 into which the rotation shaft 32 is inserted is formed at the center of the end surface of the plate 24 (see FIG. 4, etc.), but the rotation shaft 32 is the end surface of the plate 24. It may be provided at a position closer to both end sides than the center in the longitudinal direction.

  The rotary shaft 32 may be configured to be rotatably inserted into a shaft hole (not shown) formed on the inner surface of each traveling belt 30 while being fixed to each end surface of the plate 24. Further, a shaft hole (not shown) may be provided in each end surface of the plate 24 and the inner surface of each traveling belt 30, and both ends of the rotating shaft 32 may be inserted in a rotatable state in the respective shaft holes.

  In such a filter body 16, the traveling belt 30 is wound around each of the rollers 20 and 22 with sufficient tension, and the traveling belt 30 and the belt belt 30 are connected to the traveling belt 30 via the drive shafts 26 and 28 by a driving source such as a motor (not shown). 1 can be moved (moved) in the direction of arrow A in FIG.

  In the primary dewatering unit 12, the gravity dewatering unit constituted by the upper surface portion 16 a of the filter body 16 is the outer surface (surface) of the filter body 16 stretched between the upper rollers 20, 22, that is, the stacked plates 24. When the processing object is placed on the transport surface, moisture contained in the processing object is filtered and separated by gravity. That is, the processing object put on the filter body 16 on the upstream side (roller 22 side) of the upper surface portion 16a is conveyed to the downstream side (roller 20 side) by the filter body 16 while only moisture is caused by gravity. It passes through the filtration holes 34 between the plates 24 and is filtered and dehydrated. The filtered water (separated liquid, filtrate) flows out and falls to the inner surface side (back surface side) of the filter body 16 and is then collected by the filtrate receiving tray 40.

  Next, the secondary dewatering unit 14 includes an endless filter body 18 wound around a plurality of rollers (rolls) 42 and 44 and driven in one direction, and the filter body 16. A portion where the outer surfaces (surfaces) of the filter body 16 and the filter body 18 are placed close to each other, that is, a lower surface portion 16b of the filter body 16 and an upper surface portion 18a of the filter body 18 serve as a pressure dewatering section (press section). Function.

  The rollers 42 and 44 around which the filter body 18 is wound have the same configuration as the rollers 20 and 22 of the filter body 16 and are provided at both ends of the drive shafts 46 and 48, respectively, as shown in FIGS. A pair of discs.

  Like the filter body 16, the filter body 18 includes a pair of travel belts 50 and 50 wound between the left and right rollers 42 and 44, respectively, and a travel direction (extending direction) between the travel belts 50 and 50. ), A plurality of plates 24 (for example, 47 configurations are illustrated in FIG. 1) are arranged so that the outer surface (outer peripheral surface) of the filter body 18 is formed by each plate 24.

  Also in the filter body 18, like the filter body 16, the running belt 50, which is a flexible member, is wound around the rollers 42 and 44 with sufficient tension. As a result, the traveling belt 50 and the plates 24 pivotally supported by the traveling belt 50 via the drive shafts 46 and 48 can travel (move) in the direction of arrow B in FIG. In the present embodiment, the traveling speed of the filter body 18 is set lower than the traveling speed of the filter body 16.

  The filter body 18 has substantially the same configuration except that the filter body 16 is different from the travel path, distance, and the like, and therefore, the same reference numerals are used for elements having the same or similar functions and effects as the filter body 16. Detailed description will be omitted. In the filter body 18, the wall portions (outflow prevention plates, side surface holding plates) 52 that are formed upright at both ends in the width direction of each plate 24 prevent the interference with the wall portion 35 of the filter body 16. It is provided at a position slightly inside the wall portion 35 (see FIGS. 3 and 4).

  In the secondary dehydration unit 14, in the pressure dehydration unit configured by arranging the lower surface portion 16 b of the filter body 16 and the upper surface portion 18 a of the filter body 18 to face each other, the filter body 16 and the filter body 18 are placed in the same direction. Moisture contained in the processing object is filtered and separated by moving in the direction of arrows A and B and sandwiching and pressurizing the processing object between the outer surfaces of both filter bodies 16 and 18.

  That is, the processing object dropped from the end of the upper surface portion 16a of the filter body 16 constituting the primary dewatering unit 12 (the end portion on the roller 20 side) is upstream of the upper surface portion 18a of the filter body 18 (on the roller 42 side). After landing, it is transported by the filter body 18 and drawn between the opposing surfaces of the lower surface portion 16b of the filter body 16 and the upper surface portion 18a of the filter body 18. At this time, the distance between the opposing surfaces of the lower surface portion 16b and the upper surface portion 18a gradually decreases toward the downstream side, so that the object to be processed is moved downstream in a state of being sandwiched and pressurized between the opposing surfaces. While being conveyed, only moisture passes through the filtration holes 34 between the plates 24 constituting the filter body 18 by the pressure applied by both filter bodies 16 and 18 and is filtered and dehydrated. The filtered water flows out and drops to the inner surface side (back surface side) of the filter body 18 constituting the secondary dewatering unit 14, and further passes through the lower surface portion 18 b of the filter body 18, and is then collected by the filtrate tray 54. Is done.

  Next, the operation of the dehydrating apparatus 10 configured as described above will be described.

  First, an object to be treated (hereinafter, sludge is explained as an example of an object to be treated) introduced to the upstream side of the primary dewatering unit 12 is conveyed by the upper surface portion 16a of the filter body 16 and is subjected to gravity dewatering (natural dewatering). Is done. The sludge is preferably introduced into the primary dewatering unit 12 as agglomerated sludge mixed with a predetermined aggregating agent in an agglomeration mixing tank (not shown).

  In this case, since no external force is applied to each plate 24 before the start of the dehydration operation, the rotational phase around the rotation axis 32 of each plate 24 is in a free position. Accordingly, the gaps 34 (filtration holes 34) between the plates 24 are in a state having a certain degree of opening, for example.

  When the dehydration operation is started, as shown in FIG. 4, the sludge receives the moving force in the moving direction A at the upper surface portion 16 a of the filter body 16, so that it is downstream of the rotating shaft 32 of each plate 24. The outer surface of the located downstream portion 24a is pressed by the sludge with the pressing force P1. As a result, each plate 24 is rotated clockwise (see arrow θ1) in FIG. 4, and the spacer 36 provided in the downstream portion 24a overlaps and is adjacent to the upstream portion 24b (rotating shaft) of the adjacent rear plate 24. A filtration hole 34 (gap 34) that is uniformly defined by an opening corresponding to the height of the spacer 36 is formed. Therefore, the separated liquid dehydrated from the sludge is discharged to the filtrate receiving tray 40 through the filtration holes 34 formed between the plates 24 (see arrow L in the upper surface portion 16a in FIG. 4).

  Subsequently, the sludge that has been gravity dehydrated by the primary dewatering unit 12 falls from the end (downstream end) of the upper surface portion 16a of the filter body 16 to the upstream side of the upper surface portion 18a of the filter body 18. And land. Therefore, this sludge is transported in the traveling direction B by the filter body 18 and put into the secondary dewatering unit 14, and is sandwiched and pressurized between the filter bodies 16 and 18 to be dehydrated, and its moisture content is desired. Is then discharged from the secondary dewatering unit 14 to the outside as a dehydrated cake.

  In this case, since no external force is applied to each plate 24 before the start of the dehydration operation, each plate 24 is the same as in the case of the upper surface portion 16a of the filter body 16 constituting the primary dewatering unit 12. The rotation phase around the rotation axis 32 is in a free position. For this reason, in the secondary dewatering section 14, the gap 34 (filter hole 34) between the plates 24 constituting the lower surface portion 16b of the filter body 16 and the upper surface portion 18a of the filter body 18 has a certain degree of opening, for example. It has become a state.

  Then, when the dehydration operation is started, as shown in FIG. 4, in the lower surface portion 16 b of the filter body 16, the sludge generates a moving force in the moving direction A and a pressing force between the opposed upper surface portion 18 a. In order to receive, the outer surface of the downstream part 24a of each plate 24 is pressed by the sludge with the pressing force P2. As a result, each plate 24 rotates clockwise (see arrow θ1) in FIG. 4, and the spacer 36 provided in the downstream portion 24a overlaps the outer surface of the upstream portion 24b of the adjacent rear plate 24. Abut.

On the other hand, in the upper surface portion 18a of the filter body 18, during the dehydration operation, as shown in FIG. 4, the sludge receives the moving force in the moving direction B and the applied pressure between the opposed lower surface portion 16b. The outer surface of the downstream portion 24a of the plate 24 is pressed by the sludge with the pressing force P3. As a result, each plate 24 rotates counterclockwise in FIG. 4 (see arrow θ2), and the spacer 36 provided in the downstream portion 24a overlaps the outer surface of the upstream portion 24b of the adjacent rear plate 24. And the filtration hole 34 (gap 34) uniformly defined by the opening corresponding to the height of the spacer 36 is formed. Thus, pressurized dehydrated separated liquid from the sludge through the filter pore 34 which is formed between the plate 24 constituting the upper surface portion 18a is discharged to the filtrate basin 54 (the upper surface portion 18a in FIG. 4 (See arrow L).

  At this time, in the present embodiment, since the traveling speed of the filter body 18 is set lower than the traveling speed of the filter body 16, the sludge is transported in the moving direction A (B) in the secondary dewatering unit 14. However, the moving speed of the upper surface portion 18a of the filter body 18 serving as the bottom surface is slower than the lower surface portion 16b of the filter body 16 serving as the top surface, and the pressing force P3 applied to the upper surface portion 18a rather than the pressing force P2 applied to the lower surface portion 16b. Therefore, each plate 24 constituting the upper surface portion 18a can be reliably rotated in the direction of the arrow θ2 to reliably form the filtration hole 34 having a desired opening degree.

  As shown in FIGS. 1 and 4, the filter bodies 16 and 18 that circulate in an endless track during the dehydrating operation are subjected to external force from sludge and the like at the portions of the rollers 20, 22, 42, and 44 that are turned back. In addition, since the trajectory is greatly bent, each plate 24 pivotally supported by the rotary shaft 32 swings greatly (see the arrow θ in FIG. 4), and the gap 34 between the adjacent plates 24 is The opening increases. For this reason, in the primary dehydration unit 12 and the secondary dehydration unit 14, even if the filtration holes 34 of the filter bodies 16 and 18 are clogged with solids or the like, the opening degree of the filtration holes 34 at the turn-up position. Since the clogged solids easily fall out of the filtration hole 34 by the enlargement of, the maintenance work for removing clogging can be eliminated or greatly reduced. That is, the dehydrating apparatus 10 can continue the dehydrating operation in a substantially maintenance-free state. Furthermore, when performing maintenance work, for example, each plate 24 is rotated in the reverse direction only by performing an operation such as setting the traveling direction of the filter bodies 16 and 18 in the reverse direction to that during normal operation, and the filter holes Since the opening of 34 fluctuates, the clogged solid matter can be more reliably dropped, and the work can be greatly reduced.

  Moreover, in the secondary dewatering unit 14, the pressure dewatering unit is formed with a certain amount of space between the lower surface portion 16 b and the upper surface portion 18 a of the filter bodies 16, 18, so that compared to the conventional belt press device. Thus, the amount of sludge (treatment object) retained in the pressure dewatering unit can be increased, and the amount of dewatering treatment and the efficiency of dewatering can be improved. At this time, since the walls 35 and 52 are erected on the side in the width direction on each plate 24, the sludge flows out from the side portion between the lower surface portion 16b and the upper surface portion 18a that are separated from each other. Can be prevented. In addition, when the secondary dehydration part 14 is narrow or there is little sludge amount, it is not necessary to install a wall part.

  As described above, according to the dehydrating apparatus 10 according to the present embodiment, the filter bodies 16 and 18 configured to be endless are run, and the filter medium 16 and 18 are used to dehydrate while conveying the processing target. In the dehydrating apparatus, the filter bodies 16 and 18 are formed by a plurality of plates 24 arranged along the traveling direction while being supported by a rotating shaft 32 in a direction orthogonal to the traveling direction. A part of each adjacent plate 24 is installed so as to be sequentially stacked in the traveling direction.

  In this manner, the plurality of plates 24 supported by the rotating shaft 32 are sequentially stacked to form the filter bodies 16 and 18, and the processing objects such as sludge are gravity dehydrated or pressure dehydrated by the filter bodies 16 and 18. As a result, the separation liquid can be smoothly discharged to the outside by using the gap 34 between the plates 24 as the filtration hole 34, and the plate of the filter bodies 16, 18 is bent at each plate. Since the opening degree of the filtration hole 34 between 24 spreads, the solid content etc. which were plugged in this filtration hole 34 fall off and are removed. That is, even if the solid matter is clogged in the filter hole 34, the solid matter is removed during the operation of the dehydrating apparatus 10, so that maintenance work is not required or is greatly reduced.

  The dehydrating apparatus 10 includes a pair of filter bodies 16 and 18, a first loop section in which one filter body 16 is looped between a plurality of rollers 20 and 22 and is endlessly circulated, and the first loop section. And a second loop part in which the other filter body 18 is looped around the plurality of rollers 42 and 44 and endlessly circulated, and is treated by the upper surface portion 16a of the first loop part. A gravity dewatering unit configured to gravity dehydrate an object is formed, and a pressure dehydration is performed to pressurize and dehydrate an object to be processed by the lower surface portion 16b of the first loop portion and the upper surface portion 18a of the second loop portion which are disposed to face each other. And the processing object dehydrated by the gravity dehydrating unit drops from the end of the first loop unit to the upper surface portion 18a of the second loop unit, and then to the pressure dehydrating unit. It is configured to be input. For this reason, the apparatus structure which has a multistage dehydration part can be comprised compactly in the conveyance direction of a process target object.

  Of course, the primary dewatering unit 12 and the secondary dewatering unit 14 may be arranged in series in the conveyance direction of the processing object. In this case, in the secondary dewatering unit, the object to be processed is gravity dehydrated as in the primary dewatering unit. With such a series arrangement, the apparatus configuration is elongated in the conveyance direction of the object to be processed, but there is an advantage that the installation space in the height direction can be suppressed and the apparatus configuration can be simplified. is there. Further, if the primary dewatering unit and the secondary dewatering unit can be driven individually, the filter cloth speed can be easily changed, and the water content of the dewatered cake can be further increased by reducing the filter cloth speed of the secondary dewatering part. Can be reduced.

  In addition, when each plate 24 is pivotally supported by the rotary shaft 32 in a freely rotating state, the secondary dehydrating unit 14 (pressure dehydrating unit) has a filtration hole 34 due to the pressure from the processing object during the dehydrating operation. However, when the trajectories of the filter bodies 16 and 18 are in the folded portion or when the operation is stopped, the pressure does not act, so The opening is widened, whereby the solid matter clogged in the filtration hole 34 can be easily removed.

  Each plate 24 has walls 35 and 52 that stand up at both ends in the width direction of the conveyance surface of the processing object. For this reason, as shown in FIGS. 1 and 4, the secondary dewatering part 14 (pressure dewatering part) formed by separating the lower surface part 16 b of the filter body 16 and the upper surface part 18 a of the filter body 18 from each other. Even in this case, it is possible to prevent the object to be processed sandwiched by pressure from flowing out from the conveying surface of each plate 24 to the side in the width direction. At this time, as shown in FIG. 3, the wall portion 35 on the filter body 16 side and the wall portion 52 on the filter body 18 side stand up at a position where they do not interfere with each other. Even at a close position (downstream position of the secondary dewatering unit 14), both do not interfere with each other and smooth operation is possible (see FIG. 4).

  Each plate 24 is preferably provided with a spacer 36 that defines the height of the gap 34 formed between the adjacent plate 24 by contacting the surface of the adjacent plate 24. If it does so, the opposing surfaces of the plate 24 will closely_contact | adhere and it can prevent reliably that the clearance gap 34 used as the filtration hole 34 is obstruct | occluded. In this case, if the spacer 36 is configured to be detachable from the plate 24, the opening degree of the filtration hole 34 can be easily specified and controlled simply by replacing the spacer 36 with one having a desired height. In addition, it is possible to easily form the filtration hole 34 having an optimum opening degree according to the properties of the processing object, the processing amount, and the like.

  In FIG. 1, as the primary dehydration unit 12, the configuration in which the object to be processed is gravity dehydrated by the gravity dehydration unit is illustrated, but the primary dehydration unit 12 is also a pair of like the secondary dehydration unit 14. It is good also as a press structure (belt press structure) which clamps and presses a process target object between the plates 24. FIG. In the case of such a configuration, for example, as shown by a two-dot chain line in FIG. 1, a filter body 60 wound around a plurality of rollers may be installed. The filter body 60 may have the same structure as the filter bodies 16 and 18 described above.

  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-described embodiment, the system that dehydrates the object to be processed in the two stages of the primary dehydration unit and the secondary dehydration part is illustrated, but it may of course be configured as a system that performs the dehydration process in three or more stages. .

  Moreover, in the said embodiment, although the lamination direction of each plate 24 which comprises the filter bodies 16 and 18 illustrated the structure where the exit direction of a separation liquid always becomes a forward direction with respect to the moving direction of a process target object, Of course, the outlet direction may be configured in the reverse direction, and may be appropriately designed according to the properties of the object to be processed, the specifications of the apparatus, and the like.

DESCRIPTION OF SYMBOLS 10 Dehydration apparatus 12 Primary dehydration part 14 Secondary dehydration part 16, 18, 60 Filter body 16a, 18a Upper surface part 16b, 18b Lower surface part 24 Plate 30, 50 Travel belt 32 Rotating shaft 34 Gap, Filtration hole 35, 52 Wall part 36 Spacer

Claims (5)

A dehydrating device that dehydrates while transporting an object to be processed with the filter body by running an endless filter body,
Said filtration body, its in a state of being pivotally supported by the rotary shaft of the traveling direction perpendicular to the direction is composed of a plurality of plates arranged along the traveling direction, wherein a portion of each adjacent plate travel Rutotomoni is installed so as to sequentially stacked in a direction, separated liquid from the processing object is adapted to be discharged to the outside from the gap formed between the plates to the adjacent,
The said plate is provided with the spacer which prescribes | regulates the height of the said clearance gap formed between this adjacent plate by contact | abutting on the surface of an adjacent plate . The dehydrator according to claim 1, wherein
The dehydrating apparatus, wherein the plate is pivotally supported by the rotating shaft in a freely rotating state. The dehydrator according to claim 1 or 2,
The said plate has the wall part which stood up at the width direction both ends of the conveyance surface of the said process target object, The dehydration apparatus characterized by the above-mentioned. The dehydration apparatus according to any one of claims 1 to 3 ,
The dewatering device includes a pair of the filter bodies, a first loop portion that is looped around a plurality of rollers and wound endlessly, and is disposed below the first loop portion. A second loop portion that is endlessly wound around a plurality of rollers is provided,
The upper surface portion of the first loop portion constitutes a gravity dewatering portion that gravity dehydrates the object to be processed, and the lower surface portion of the first loop portion and the upper surface portion of the second loop portion that are arranged to face each other. A pressure dehydration unit configured to dehydrate the object to be processed is configured.
The object to be dehydrated in the gravity dehydration unit drops from the end of the first loop unit to the upper surface portion of the second loop unit, and is then introduced into the pressure dehydration unit. Dehydrating device to do. The dehydrator according to claim 4 ,
The filter body includes a flexible member that is looped and driven between the plurality of rollers, and the plurality of plates that are pivotally supported by the rotation shaft provided on the flexible member. A dehydrator characterized by.

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