JP5801687B2 - Belt press dehydrator - Google Patents

Description

  The present invention relates to a belt press dewatering device for performing a dewatering process on an object to be processed such as sludge using a filter cloth belt.

  2. Description of the Related Art Conventionally, a belt press dewatering device that dehydrates pressure between endless filter cloth belts that circulate sludge such as sewage or factory wastewater that is a processing target and reduces the water content has been used.

  With regard to such a belt press dewatering device, Patent Document 1 discloses that in order to improve the dewatering performance, a primary dewatering unit that pressurizes and dewaters sludge between filter cloth belts, and a dewatering process is performed in the primary dewatering unit. And a secondary dewatering unit for further dewatering the sludge using a filter cloth belt and a pressure roller. Between these primary dewatering unit and secondary dewatering unit, iron-based dewatering assistant (iron-based agglomeration) is added to the sludge. The structure provided with the mixer which mixes (agent) is disclosed.

JP 61-42312 A

  By the way, in the said prior art, it becomes the structure by which the sludge of the wide and thin shape discharged | emitted from between the filter cloth belts of a primary dehydration part is thrown into the secondary dehydration part of a back | latter stage with the wide and thin shape. . For this reason, compared with the primary dewatering part into which sludge is introduced with a certain height, the secondary dewatering part into which thin sludge is charged tends to decrease the efficiency of the pressure dehydration. Since the sludge thrown into the secondary dewatering section is after the dewatering process has been performed in the primary dewatering section, further dewatering is difficult, and the efficiency is further reduced with thin sludge.

  The present invention has been made in consideration of the above-described conventional problems. When a processing object is sequentially dehydrated by a plurality of stages of dewatering units, the belt press can improve the dewatering performance of the latter stage of dewatering units. An object is to provide a dehydrating apparatus.

The belt press dewatering apparatus according to the present invention further uses a filter cloth belt to dehydrate a primary dewatering unit that dehydrates a processing object using a filter cloth belt and a processing object that has been dewatered in the primary dewatering part. a secondary dewatering unit that is provided between the primary dewatering section and a secondary dewatering unit, gradually the dimension in the width direction of the conveying path of the processing object to be discharged from the primary dewatering unit flows toward the downstream side reduces, a primary dewatering unit set path increases the height of the processing object to be discharged and out whether we transportable by from the processing object height with the width by the combined passage is reduced is increased A storage tank for temporarily storing and a shape changing section having a discharge path for discharging the processing object temporarily stored in the storage tank to the secondary dewatering section, and the collecting path and the discharge path are: It is installed in the position which mutually overlaps by planar view.

  According to such a configuration, by providing the shape changing portion that increases the height of the object to be processed between the plurality of stages of the dewatering portions, the width spreads on the filter cloth belt of the primary dewatering portion. The processing object in the state can be compacted by passing through the shape changing unit, and can be thrown into the secondary dewatering unit with the thickness increased. As a result, the processing object can be thrown into the subsequent secondary dewatering section with sufficient thickness, so that the dewatering performance in the secondary dewatering section can be improved.

When a dispersion member that disperses the processing object with increased height in the width direction is provided in the carry-out path, the processing object with increased height remains in a state in which the height is maintained. The dispersion member can be spread and spread to both sides in the width direction. For this reason, dehydration can be performed by effectively utilizing the width dimension of the filter cloth belt in the secondary dehydration unit, and dewatering efficiency can be further enhanced.

  When the shape changing unit has a collecting path in which the width direction dimension of the conveyance path through which the processing object discharged from the primary dehydrating unit flows gradually decreases toward the downstream side, The processing objects spread in the direction can be collected at the center in the width direction by the collecting path, and the height can be increased.

The width dimension of the front SL-out path is not the preferred to increase gradually toward the downstream side. If it does so, the width of the filter cloth belt which constitutes the secondary dewatering part is effective since the processing object carried out from the shape change part can be thrown into the secondary dewatering part while appropriately diffusing in the width direction. The dehydration utilized in the above becomes possible, and higher dehydration efficiency can be obtained.

Wherein the shape changing unit, because it has a reservoir for temporarily storing the processed object to be discharged from the primary dewatering unit, it is possible to reduce clogging and pressure loss of the processing object in the shape changing unit, more Smooth distribution is possible.

  According to the present invention, by providing a shape changing portion that increases the height of the object to be processed between a plurality of stages of dewatering portions, a state of spreading in the width direction on the filter cloth belt of the primary dewatering portion. The object to be treated can be put into the secondary dewatering unit with its thickness increased. As a result, the processing object can be thrown into the subsequent secondary dewatering section with sufficient thickness, so that the dewatering performance in the secondary dewatering section can be improved.

FIG. 1 is an overall configuration diagram of a belt press dewatering apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective explanatory view schematically showing the state of the processing object input from the primary dewatering unit to the shape changing unit and the processing object carried out from the shape changing unit to the secondary dewatering unit. FIG. 4 is an overall configuration diagram of a belt press dewatering device according to a modification of the belt press dewatering device according to the first embodiment. FIG. 5 is an overall configuration diagram of a belt press dewatering device according to a second embodiment of the present invention. 6 is a partially omitted cross-sectional view taken along the line VI-VI in FIG.

  Hereinafter, preferred embodiments of a belt press dewatering 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 belt press dewatering device 10 according to a first embodiment of the present invention, and is a side view partially showing a cross section. A belt press dehydrating apparatus 10 (hereinafter also simply referred to as “dehydrating apparatus 10”) according to this embodiment is configured to process a processing object such as sewage sludge into a primary dehydrating unit 12 and a secondary dehydrating unit 14 using a filter cloth belt. It is a device that dehydrates while being conveyed in order and discharges it as a dehydrated cake, and may of course be used not only as a dehydrator but also as a concentrator.

  As shown in FIG. 1, the dewatering device 10 includes a primary dewatering unit 12 that gravity dehydrates an object to be treated using a filter cloth belt (upper filter cloth belt) 16, and a process that is dewatered by the primary dewatering unit 12. A shape changing unit (consolidation mechanism) 18 that changes the shape of the object and a processing object discharged from the shape changing unit 18 are pressure-dehydrated between the filter cloth belt 16 and the filter cloth belt (lower filter belt) 20. A secondary dewatering unit 14.

  The primary dewatering unit 12 includes an endless filter cloth belt 16 that is wound around a plurality of rollers 22a to 22f and driven to rotate in one direction, and moves toward the moving direction of the filter cloth belt 16 (arrow A direction). The filter cloth belt 16 stretched between the rollers 22a and 22e inclined upward constitutes the gravity dewatering portion 12a.

  The filter cloth belt 16 is a long belt-like filter cloth having water permeability, and is wound around each of the rollers 22a to 22f with sufficient tension. An arrow in FIG. It can move in direction A.

  The gravity dewatering unit 12a filters the water contained in the processing object by gravity by placing the processing object on the outer peripheral surface (surface) of the filter cloth belt 16 stretched between the upper rollers 22a and 22e. It is a means to separate.

  In the primary dewatering unit 12, the processing object put on the filter cloth belt 16 on the upstream side (roller 22 e side) of the gravity dewatering unit 12 a is conveyed to the downstream side (roller 22 a side) by the filter cloth belt 16. Meanwhile, only moisture passes through the filter cloth belt 16 by gravity and is filtered and dehydrated. The filtered water (separated liquid, filtrate) permeates and falls to the inner peripheral surface side (back surface side) of the filter cloth belt 16 and is then collected by the filtrate receiving tray 24.

  The secondary dewatering unit 14 includes an endless filter cloth belt 20 wound around a plurality of rollers 22f to 22i and driven to rotate in one direction, and the filter cloth belt 16, and the filter cloth belt 16 and the filter cloth belt. The portion where the outer peripheral surfaces (surfaces) 20 and 20 are in contact with (or close to each other) constitutes a pressure dewatering unit (press unit) 14a. 1 shows a slightly exaggerated gap between the outer peripheral surfaces of the filter cloth belt 16 and the filter cloth belt 20 for easy understanding, but in actuality, the outer peripheral surfaces of the filter cloth belt 16 and the filter cloth belt 20 are illustrated. The space is in contact with or close to each other, and the same applies to FIGS. 4 and 5.

  Like the filter cloth belt 16, the filter cloth belt 20 is a long belt-like filter cloth having water permeability, wound around the rollers 22f to 22i with sufficient tension, and a drive source such as a motor (not shown). Thus, it can be moved in the direction of arrow B in FIG.

  The pressure dewatering unit 14a is disposed so that the outer peripheral surface of the filter cloth belt 16 stretched between the rollers 22b, 22c, 22f, and 22d and the outer peripheral surface of the filter cloth belt 20 stretched between the rollers 22i, 22f, and 22g are in contact with each other. In this state, the filter cloth belt 16 and the filter cloth belt 20 are moved in the same direction (directions of arrows A and B), and the object to be treated is sandwiched and pressed between the outer peripheral surfaces of the filter cloth belts 16 and 20. And means for filtering and separating water contained in the object to be treated.

  In the secondary dewatering unit 14, the processing object discharged from the shape changing unit 18 and put on the filter cloth belt 20 on the upstream side (roller 22 i side) of the pressure dewatering unit 14 a is conveyed by the filter cloth belt 20. Then, only moisture is drawn from the vicinity of the roller 22b to the downstream side in a state of being pulled and sandwiched and pressurized between the filter cloth belt 16 and the filter cloth belt 20 constituting the pressure dewatering unit 14a. The filter cloth belt 20 is permeated through the filter cloth belt 20 by the pressure applied by the two filter cloth belts 16 and 20, and is filtered and dehydrated. The filtered water permeates and falls to the inner peripheral surface side (back surface side) of the filter cloth belt 20 constituting the pressure dewatering section 14a, and the filter cloth belt 20 between the lower rollers 22g, 22h, and 22i also. After permeating and falling, it is collected by the filtrate receiving tray 26.

  FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and is a plan cross-sectional view of the shape changing unit 18.

  The shape changing unit 18 increases the dimension (thickness) in the height direction of the processing object dehydrated by the primary dehydrating unit 12 and then carries it out to / into the secondary dehydrating unit 14, thereby performing the secondary dehydration. It is a process target object shape change part (process target object height amplification part) which improves the dehydration efficiency in the part. That is, the shape changing unit 18 functions as a consolidation mechanism that compacts the processing object between the primary dewatering unit 12 and the secondary dewatering unit 14, and throws the consolidated processing object into the secondary dewatering unit 14. This improves the dewatering efficiency in the secondary dewatering unit 14.

  As shown in FIGS. 1 and 2, the shape changing portion 18 has an inlet 28 a opened near the primary dewatering portion 12 on the top surface and an outlet 28 b opened on the side near the secondary dewatering portion 14. A tank (storage tank) 28 is provided. In the tank 28, the inlet 28 a is connected to the outlet of the primary dewatering unit 12 (near the roller 22 a) by the collecting path 30, and the outlet 28 b is connected to the inlet of the secondary dewatering unit 14 (near the roller 22 i) by the carry-out path 32. Has been. The tank 28 is provided with a stirring device 29 (see a two-dot chain line in FIG. 1) for stirring the processing object charged and retained therein, a chemical addition port (coagulant charging port) (not shown), and the like. May be.

  As shown in FIG. 2, the tank 28 constituting the shape changing unit 18 includes the filter cloth belt 16 and the filter cloth belt 20 that constitute the conveyance path of the object to be processed in the primary dewatering unit 12 and the secondary dewatering unit 14. The angle at which the width W1 of the side edge parallel to the width direction is set smaller than the width W2 in the direction perpendicular to the conveying direction of the filter cloth belt 16 and the filter cloth belt 20, and a sufficient depth is formed in the tank. It is a tank. Of course, the tank 18 may be other than a square tank, but its width and outer diameter are set narrower than the width W2 of the two filter cloth belts 16 and 20. In the present embodiment, the filter cloth belt 16 and the filter cloth belt 20 are described as having the same width W2. However, the widths of the filter cloth belts 16 and 20 may be different.

  As shown in FIG. 1 and FIG. 2, the collecting path 30 is a tapered conveying path that gradually becomes narrower from the outlet side of the primary dewatering unit 12 toward the inlet 28 a side of the tank 28, and is a processing target to be conveyed. Side plates 30a for preventing the falling off of objects are formed upright on both sides, and are inclined downward toward the downstream side (inlet 28a side).

  The collection path 30 is set so that the inlet 28a side of the tank 28 is narrower than the outlet side of the primary dewatering unit 12, so that the processing object spread and dewatered by the primary dewatering unit 12 in the width direction. This is a transport path (flow path) that can be collected from the inlet 28a into the tank 28 in the dense state.

  As shown in FIGS. 1 and 2, the carry-out path 32 is a widened conveyance path that gradually widens from the outlet 28 b side of the tank 28 toward the inlet side of the secondary dewatering unit 14, and is a processing target to be conveyed. Side plates 32a for preventing the falling of objects are formed upright on both sides, and are inclined downward toward the downstream side (inlet side of the secondary dewatering unit 14).

  In the carry-out path 32, the inlet side of the secondary dewatering unit 14 is set wider than the outlet 28b side of the tank 28, so that the processing objects collected in the tank 28 are expanded toward both sides in the width direction. It is a conveyance path (flow path) that can be introduced into the secondary dehydration unit 14.

  As shown in FIG. 1, the processing object thrown into the tank 28 from the inlet 28 a is temporarily stored and retained in the tank 28 and then discharged from the outlet 28 b to the carry-out path 32 by overflow. . That is, in the tank 28, the input amount of the processing object from the inlet 28a and the discharge amount from the outlet 28b are set to be equal, so that the processing object staying in the tank 28 is from the supernatant portion. Sequentially discharged to the outlet 28b by overflow.

  Dispersing plates (dispersing members) 38 are provided on the carry-out path 32 so as to come into contact with the processing object carried out from the outlet 28b of the tank 28 and forcibly disperse the processing object to both sides in the width direction. . The dispersion plate 38 is, for example, a triangular member that is widened toward the downstream side by setting a vertex on the upstream side and setting a base on the downstream side in a plan view shown in FIG. 32 is branched in two directions. Of course, the dispersion plate 38 may branch the carry-out path 32 in three or more directions.

  Next, the operation of the belt press dewatering device 10 configured as described above will be described.

  First, an object to be treated (hereinafter, sludge is explained as an example of the object to be treated) introduced to the upstream side of the gravity dewatering part 12a that constitutes the primary dewatering part 12 is conveyed on the filter cloth belt 16 by gravity. It is dehydrated (natural dehydration) and put into the collecting path 30. The sludge flowing through the collecting path 30 is collected in the center in the width direction as it goes downstream, and then is introduced into the tank 28 from the inlet 28a.

  The sludge thrown into the tank 28 is continuously discharged from the outlet 28b to the carry-out path 32 due to overflow. It is also effective to stir the sludge staying in the tank 28 with the stirring device 29. If it does so, the gas content in sludge can be extracted by stirring and the dehydration efficiency in the secondary dehydration part 14 can be improved. Furthermore, if an inorganic flocculant such as an iron-based flocculant is added from the chemical addition port during the stirring, the sludge collected in the tank 28 is sufficiently combined with the flocculant due to the high stirring efficiency and compaction action in the tank 28. And the dewatering efficiency in the secondary dewatering unit 14 can be further improved.

  Next, the sludge carried out from the outlet 28b of the tank 28 to the carry-out path 32 is thicker than the thickness (height H1) on the outlet side of the primary dewatering unit 12 due to the compaction action in the shape changing unit 18. The increased state (height H2) (see FIG. 3) flows through the carry-out path 32 in the thickened height H2 state and is put into the secondary dewatering unit 14. Thereby, the sludge thrown into the pressure dehydration part 14a of the secondary dehydration part 14 is pinched and pressurized between the filter cloth belts 16 and 20, and is efficiently dehydrated, and the moisture content is lowered to a desired value. After that, the dehydrated cake is discharged to the outside from the secondary dewatering unit 14.

  As described above, according to the belt press dewatering apparatus 10 according to the present embodiment, the primary dewatering unit 12 that dehydrates the processing object using the filter cloth belt 16 and the dewatering process performed by the primary dewatering unit 12. Provided between the secondary dehydration unit 14 for further dehydrating the object using the filter cloth belts 16 and 20, the primary dehydration unit 12, and the secondary dehydration unit 14, and is discharged from the primary dehydration unit 12. A shape changing unit 18 for increasing the height of the object to be processed and then carrying it out to the secondary dewatering unit 14 is provided.

  Thus, the filter cloth belt of the primary dewatering unit 12 is provided between the primary dewatering unit 12 and the secondary dewatering unit 14 by providing the shape changing unit 18 that increases (increases) the height of the object to be processed. The processing object in the state of spreading in the width direction on 16 is consolidated by passing through the shape changing unit 18 and thrown into the secondary dewatering unit 14 with its thickness (height) increased. it can. As a result, the processing object can be thrown into the subsequent secondary dehydration unit 14 with a sufficient thickness, so that the dehydration performance of the pressure dehydration unit 14a of the secondary dehydration unit 14 is improved. be able to.

  In the case of this embodiment, as shown in FIGS. 2 and 3, as the shape changing portion 18, the outlet 28 b to which the upstream side of the carry-out path 32 is connected is about a width W 1 that is narrower than the width W 2 of the filter cloth belts 16 and 20. The tank 28 is set. Therefore, as shown in FIG. 3, the processing object P2 to be fed from the tank 28 to the secondary dewatering unit 14 is higher than the height H1 of the processing object P1 to be fed from the primary dewatering part 12 to the tank 28. The height H2 can be easily and reliably increased. In this way, when the outlet 28b is set to a width dimension narrower than the width dimension of the filter cloth belts 16 and 20, the processing object P1 that is spread in the width direction by the primary dewatering unit 12 and becomes thinner is aggregated in the width direction. Then, it is discharged to the carry-out path 32 in a state where the thickness is increased, and can be put into the secondary dewatering unit 14 as the processing object P2 having a sufficient thickness (height H2).

  Moreover, since the shape change part 18 has the tank 28 used as the storage tank which stores a process target object temporarily, after the process target object continuously thrown in from the gathering path 30 is once retained in the tank 28. FIG. It can be carried out to the carry-out path 32. Thereby, it can reduce that the process target which receives a shape change between the collection path 30 and the carrying-out path 32 produces clogging on a flow path, or produces pressure loss, and smooth distribution is attained.

  In FIG. 1, as the primary dehydration unit 12, a configuration in which the object to be processed is gravity dehydrated by the gravity dehydration unit 12 a is illustrated, but the primary dehydration unit 12 is also paired like the secondary dehydration unit 14. In order to obtain a belt press structure that sandwiches and presses the object to be processed between the filter cloth belts, for example, as shown by a two-dot chain line in FIG. 1, a filter cloth belt 42 wound around rollers 40a, 40b, and 40c is provided. May be installed. Thus, when the belt press structure is used for the primary dewatering unit 12, the shape of the processing object P1 discharged from the primary dewatering unit 12 is a thinner plate, so The effect of improving the dewatering performance by providing the shape changing unit 18 between the dewatering unit 12 and the secondary dewatering unit 14 becomes more remarkable. Of course, the secondary dewatering unit 14 may be configured to pressurize and dewater the object to be processed with, for example, a roller and a filter cloth belt other than the structure using the pair of filter cloth belts 16 and 20.

  Further, by connecting the outlet 28b of the tank 28 and the inlet of the secondary dewatering unit 14 and providing a carry-out path 32 in which the inlet side of the secondary dewatering unit 14 is set wider than the outlet 28b side of the tank 28. Since the processing object carried out from the outlet 28b of the tank 28 can be thrown into the secondary dewatering unit 14 while appropriately diffusing in the width direction, the filter cloth belt 16 constituting the secondary dewatering unit 14, Dehydration using the width dimension of 20 effectively is possible, and higher dehydration efficiency can be obtained.

  At this time, by providing the dispersion plate 38 on the carry-out path 32, as shown in FIGS. 2 and 3, the tank 28 causes the filter cloth belt 16 and the filter cloth belt 20 to be concentrated to a width W1 narrower than the width W2. Then, the object to be processed that has flowed from the outlet 28b onto the carry-out path 32 can be spread and distributed to both sides while maintaining a sufficient height H2. For this reason, it becomes possible to perform dewatering more effectively utilizing the width dimension of the two filter cloth belts 16 and 20 in the secondary dewatering unit 14, and the dewatering efficiency can be further enhanced.

  In addition, in FIG. 3, since the conveyance state of the sludge in the structure which provided the dispersion | distribution board 38 is illustrated, the state where the sludge is branched and flowed in two directions on the carrying-out path 32 is illustrated. In the case of the configuration in which the dispersion plate 38 is not provided, the sludge flows on the carry-out path 32 with a cross-sectional shape approximate to the shape of the outlet 28b, and maintains the thickness (height H2) depending on the shape of the carry-out path 32. It is slightly widened in the width direction and charged into the secondary dewatering unit 14. When the dispersion plate 38 is not installed as described above, the dispersion efficiency of the sludge filter cloth belts 16 and 20 in the width direction is lowered, but the secondary dewatering unit 14 is sufficiently increased in the thickness of the sludge. Therefore, it is possible to obtain a high dehydration efficiency.

  As shown in FIGS. 1 and 2, the collecting path 30 and the carry-out path 32 are installed at positions that overlap each other in plan view. Thus, by providing the collecting path 30 and the carry-out path 32 on the same side surface side of the shape changing unit 18 and arranging them side by side in the height direction, the primary dewatering unit 12 and the secondary dewatering unit 14 are disposed of the processing object. Since the dehydrating apparatus 10 can be arranged in the transport direction so as to be elongated in the transport direction, an increase in installation space can be avoided, and a compact equipment configuration can be realized.

  FIG. 4 is an overall configuration diagram of a belt press dewatering device 10a according to a modification of the belt press dewatering device 10 according to the first embodiment, and FIG. 4 (A) illustrates a belt press dewatering device 10a according to the modification. A partially omitted plan view is shown, and FIG. 4B is a side view of the belt press dewatering device 10a shown in FIG.

  As shown in FIGS. 4A and 4B, the belt press dewatering device 10a includes a primary dewatering unit 44 and a secondary dewatering having substantially the same structure as the primary dewatering unit 12 and the secondary dewatering unit 14. The parts 46 are arranged side by side in the conveyance direction of the processing object, and the shape changing unit 18 is installed therebetween.

  The primary dewatering unit 44 includes a filter cloth belt 50 wound between the rollers 48a and 48b, and the secondary dewatering unit 46 includes a filter cloth belt 52 wound between the rollers 48c and 48d and the rollers 48e and 48f. A filter cloth belt 54 is provided. In the case of this belt press dehydrating apparatus 10a, the apparatus configuration is elongated in the conveying direction of the object to be processed, but the advantage is that the installation space in the height direction can be suppressed and the apparatus configuration can be simplified. There is. In addition, if the primary dewatering unit and the secondary dewatering unit can be driven individually, it is easy to change the filter cloth speed, and by reducing the filter cloth speed of the secondary dewatering part, the water content of the dehydrated cake is further reduced. descend.

  Next, a belt press dewatering apparatus 10b according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is an overall configuration diagram of a belt press dewatering device 10b according to the second embodiment of the present invention. 6 is a partially omitted cross-sectional view taken along the line VI-VI in FIG.

  As shown in FIG. 5, the belt press dewatering device 10 b (hereinafter also simply referred to as “dewatering device 10 b”) is treated between a filter cloth belt (upper filter cloth belt) 60 and a filter cloth belt (lower filter cloth belt) 62. The object is discharged from the primary dewatering unit 64 for pressure dehydrating the object, the shape changing unit (consolidation mechanism) 66 for changing the shape of the processing object dehydrated by the primary dewatering unit 64, and the shape changing unit 66. A secondary dewatering unit 68 that depressurizes and dehydrates the object to be treated between the filter cloth belt 60 and the filter cloth belt 62 is provided.

The filter cloth belt 60 is wound around a plurality of rollers 70a to 70i and 70k and 70l and driven to rotate in one direction. Similarly, the filter cloth belt 62 is wound around the plurality of rollers 70h to 70p and 70c and 70e. And is driven in one direction. The filter cloth belt 60 and the filter cloth belt 62 are largely separated from each other by their rollers 70d and 70j in the middle of the primary dewatering section 64 and the secondary dewatering section 68, so that a space 72 is formed between them. Is forming.

  On the upstream side of the space 72, the outer peripheral surfaces (surfaces) of the filter cloth belt 60 and the filter cloth belt 62 are disposed in contact (or close to each other), so that the pressure dewatering section (press section) 64a of the primary dewatering section 64 is provided. The outer surface (surface) of the filter cloth belt 60 and the filter cloth belt 62 is in contact (or close) with each other on the downstream side of the space 72 so that the pressure dewatering section ( The press part) 68a is comprised. Of course, the primary dewatering section 64 may be formed as a gravity dewatering section as in the case of the primary dewatering sections 12 and 44 of the belt press dewatering apparatus 10 and 10a according to the first embodiment.

  The pressure dehydration units 64a and 68a constituting the primary dehydration unit 64 and the secondary dehydration unit 68 have the same function as the pressure dehydration unit 14a of the dehydration apparatuses 10 and 10a. It is collected by the lower filtrate trays 73 and 74.

  Next, the shape changing unit 66 has a function similar to that of the shape changing unit 18 of the dehydrating apparatuses 10 and 10a, and the height-direction dimension (thickness) of the treatment object to be dehydrated by the primary dehydrating unit 64. ) Is increased and then transferred to the secondary dewatering unit 68 to improve the dewatering efficiency in the secondary dewatering unit 68, and the processing object shape changing unit (processing object height amplifying unit). . That is, the shape changing unit 66 functions as a compacting mechanism that compacts the processing object between the primary dewatering unit 64 and the secondary dewatering unit 68, similarly to the shape changing unit 18. By throwing it into the secondary dewatering unit 68, the dewatering efficiency in the secondary dewatering unit 68 is improved.

  As shown in FIGS. 5 and 6, the shape changing unit 66 is installed in a space 72 formed between the filter cloth belts 60 and 62 that are separated from each other by the rollers 70 d and 70 j. The shape changing unit 66 collects the processing objects discharged from the primary dehydrating unit 64 in the center in the width direction, and carries the processing objects collected by the collecting path 76 to the secondary dehydrating unit 68. By providing the unloading path 78, the flow path width changing member temporarily changes the conveyance flow path width of the processing object flowing from the primary dehydrating unit 64 to the secondary dehydrating unit 68.

  The shape changing unit 66 is, for example, a rectangular parallelepiped block member that is supported by a bracket 80 provided on a base (not shown) that supports and fixes the dehydrating device 10b on the floor surface, and is installed in the space 72. A collecting path 76 and a carry-out path 78 and a dispersion plate 82 described later are formed in the block member.

  Note that a roller 70j for forming the space 72 is disposed on the outer peripheral surface of the filter cloth belt 62 immediately downstream of the shape changing portion 78. As shown in FIG. By adopting a two-divided structure in which only the vicinity of both side edges of the filter cloth belt 62 is abutted and supported, the processing object carried out from the shape changing portion 66 can be smoothly moved downstream from the gap between the pair of rollers 70j, 70j. Can be conveyed. On the other hand, since the other rollers 70a and the like are not arranged on the conveyance path of the processing object, the single roller structure may be slightly longer than the width of the filter cloth belt 60 or the filter cloth belt 62. Of course, a two-part structure such as the roller 70j may be used, and the same applies to the roller 22a and the like.

  The collecting path 76 has a function similar to that of the collecting path 30 of the dehydrating devices 10 and 10a, and is a tapered conveying path that gradually narrows from the outlet side of the primary dewatering unit 64 toward the downstream side. . As shown in FIG. 5, the shape changing portion 66 is discharged from the primary dewatering portion 64 by the lower surface of the shape changing portion 66 being installed at a position that is in sliding contact with or close to the outer peripheral surface of the filter cloth belt 62 between the rollers 70 i and 70 j. The processed object smoothly flows into the collecting path 76 and is circulated downstream by the downward inclination.

  The carry-out path 78 has a function similar to that of the carry-out path 32 of the dehydrating devices 10 and 10a, and is forward-conveyed that gradually increases in width toward the downstream side from the narrow-width portion 76a serving as the outlet of the collecting path 76. Road. On the carry-out path 78, a dispersion plate (dispersion member) 82 having the same function as the dispersion plate 38 of the dehydrating devices 10, 10a is disposed. Of course, the dispersion plate 82 may also be one in which the carry-out path 78 is branched into three or more directions.

  As shown in FIG. 6, the processing objects that have exited the primary dewatering unit 64 and flowed into the collecting path 76 are gradually collected in the center in the width direction, and the thickness (height) is changed from the height H1 to the height H2. (For example, refer to the processing objects P1 and P2 shown in FIG. 3), and then flows directly from the narrow portion 76a to the carry-out path 78 and is put into the secondary dewatering portion 68.

  As described above, also in the belt press dewatering device 10b according to the present embodiment, the dewatering process is performed by the primary dewatering unit 64 that dehydrates the processing object using the filter cloth belts 60 and 62 and the primary dewatering unit 64. The object to be treated is provided between the secondary dewatering unit 68 for further dewatering using the filter cloth belts 60 and 62, the primary dewatering unit 64, and the secondary dewatering unit 68, and is discharged from the primary dewatering unit 64. In the same manner as in the case of the belt press dewatering device 10 or 10a according to the first embodiment, the shape changing unit 66 is provided to increase the height of the processing object to be removed and then to the secondary dewatering unit 68. The object to be processed that has spread in the width direction in the primary dewatering unit 64 is consolidated by passing through the shape changing unit 66, and the thickness (height) is increased to the secondary dewatering unit 68. The pressure dehydrating part 68 of the secondary dehydrating part 68 can be charged. Dewatering performance becomes possible to improve in.

  In this case, in the present embodiment, the shape changing unit 66 has a structure in which the width dimension of the conveyance path through which the processing object flows is narrowed by the collecting path 76, and as shown in FIG. The height H2 of the processing target P2 input from the shape changing unit 66 to the secondary dewatering unit 68 is easily and surely higher than the height H1 of the processing target P1 input to the shape changing unit 66. Therefore, the apparatus configuration can be simplified and the cost can be reduced. Note that the dewatering device 10b having the two-stage belt press structure using the filter cloth belts 60 and 62 shown in FIG. 5 is also replaced with the shape changing unit 18 shown in FIG. Of course, the dehydrating apparatuses 10 and 10a shown in FIGS. 1 and 4 may be replaced by the shape changing unit 66 having no tank 28 instead of the shape changing unit 18. May be.

  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. . In this case, the shape changing units 18 and 66 may be installed between any or all of the two-stage dewatering units, for example.

  Moreover, as a shape change part (consolidation mechanism) which consolidates a process target object between a primary dehydration part and a secondary dehydration part and increases the height, it is a structure other than said shape change parts 18 and 66. Of course, what is necessary is just to have the structure which can increase the thickness, before putting the process target dehydrated in the former dehydrating part into the latter dehydrating part.

10, 10a, 10b Belt press dewatering device 12, 44, 64 Primary dewatering unit 14, 46, 68 Secondary dewatering unit 16, 20, 60, 62 Filter cloth belt 18, 66 Shape changing unit 30, 76 Collecting path 32, 78 Unloading path 38, 82 Dispersion plate 42, 50, 52, 54 Filter cloth belt

Claims (3)

A primary dewatering unit for dewatering the object to be treated using a filter cloth belt;
A secondary dehydration unit for further dehydrating the processing object dehydrated in the primary dehydration unit using a filter cloth belt;
The primary dewatering unit and provided between said secondary dewatering unit, and front SL gradually decreases toward the downstream side in the width direction dimension of the transport path of the processing object flows discharged from the primary dewatering unit , a set path for exiting the height is increased or et transportable processing object to be discharged from the primary dewatering unit, the combined passage temporarily processing object height is increased with the width is reduced by And a shape change unit having a storage tank that automatically stores, and a carry-out path for carrying out the processing object temporarily stored in the storage tank to the secondary dehydration unit,
The belt press dewatering device, wherein the collecting path and the unloading path are installed at positions overlapping each other in plan view. The belt press dewatering device according to claim 1,
A belt press dewatering device according to claim 1, wherein a dispersion member that disperses the processing object having an increased height in the width direction is provided in the carry-out path. The belt press dewatering device according to claim 1 or 2,
A belt press dewatering device characterized in that the widthwise dimension of the carry-out path gradually increases toward the downstream side.

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