JP2004321897A - Small piece dehydrating apparatus and multistage dehydration equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small piece dehydrating apparatus for dehydrating a large quantity of wet small pieces of plastic pieces or the like continuously. <P>SOLUTION: This dehydration apparatus is composed of a rotary perforated disk constituted so that the disk face having many small holes smaller than small pieces is rotated while being held vertically, a small piece spouting means for spouting wet small pieces together with an airflow toward the rotary perforated disk from the spouting side of the rotary perforated disk to blow off waterdrops toward the waste water side through the small holes, a blower for blowing down the small pieces stuck to the rotary perforated disk toward the spouting side by blowing air toward the side of the rotary perforated disk different from the side of the spouting means on the waste water side and a casing divided by a sealing member contacting with the peripheral surface of the rotary perforated disk into a small piece recovering part for receiving the dehydrated small pieces on the spouting side and a water collecting part for collecting water on the waste water side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dewatering apparatus for dewatering plastic pieces and other wet pieces wetted with water in an air stream.
[0002]
[Prior art]
The wet flakes include plastic flakes, fiber waste, paper chips, shredder dust, and the like, which are pulverized from waste and separated by utilizing a difference in specific gravity, and are often dehydrated in a subsequent step. A centrifugal dewatering tank is widely known as a dewatering device for this purpose.
[0003]
For example, a centrifugal dehydrator is a device that removes water by centrifugal force by loading a single wet strip into a water-permeable high-speed rotating tank, rotating the layer at high speed, and stopping the rotation after the treatment. Take out the half-dried strip. The strips were intermittently dehydrated a plurality of times so that the strips of the next lot were put in and the next dehydration was performed.
[0004]
[Problems to be solved by the invention]
Since the conventional centrifugal dehydration tub as described above is driven to rotate at a high speed, there is a limit to the size and strength against load, there is a limitation on the processing amount, and since it is a batch type in which dehydration work is performed for each charge. , Work efficiency was also low.
[0005]
The present invention has been made in view of the above problems, and provides a continuous strip dewatering apparatus capable of continuously supplying wet strips containing water and increasing the amount of dewatering. Further, the present invention provides a dewatering facility capable of dewatering wet strips to a substantially dry state.
[0006]
[Means for Solving the Problems]
The strip dewatering apparatus of the present invention blows wet strips containing moisture from the spray side with an air flow toward a rotating porous board that is rotated with the board surface having a number of holes smaller than the strips substantially vertical. Then, while leaving the small pieces on the surface of the spraying side, the moisture in the small pieces is passed through the holes of the rotary perforated board and blown off to the drainage side to collect the small pieces on the board surface.
[0007]
In this dewatering device, the rotary perforated disk is rotating, and the wet fine particles are continuously blown from the spray side toward the partial surface area of the rotary perforated disk by an air flow. Is stopped suddenly by the rotary perforated plate and only moisture passes through the front hole to the drain side due to inertial force or impact force, the strip is dehydrated on the board, and the strip on the board falls. Since the rotary perforated disk is rotated, the surface of the disk surface that comes to the surface area where the small pieces are sprayed is always a new porous surface, so that the dewatered surface area can be always secured and the amount of dewatering treatment can be increased. Since the strip dewatering apparatus of the present invention continuously sprays wet strips on the rotating perforated disk, continuous dewatering operation is also possible.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The strip dewatering apparatus of the present invention includes a rotary perforated disk having a board surface provided with a large number of through-holes having dimensions smaller than the strip, wherein the disk surface is rotated in a substantially vertical state, and a spraying side toward the rotary perforated disk. A small piece spraying means for spraying water-containing fine particles with an air stream, and blowing water to the drainage side through the holes of the rotary porous disc, and dewatered falling from the rotary porous disc at the spraying side of the rotary porous disc. Strip collecting means for receiving strips.
[0009]
First of all, for a rotary perforated board, the board surface is rotated almost vertically, and the small pieces left after the water is splashed on the board face are turned downward by their own weight and centrifugal force during one rotation of the board face. Good for dropping. In this arrangement, the dewatered debris can be efficiently collected by disposing the rotary perforated disc and providing the strip collecting means below the vertical rotary disc.
[0010]
In particular, it is preferable that the rotary perforated plate has its plate surface inclined downward toward the spraying side, so that the dewatered pieces easily fall on the plate surface. In particular, it is preferable that the rotary perforated disk is formed as a disk, held on a horizontal rotary shaft connected to the center of the disk surface with the disk surface being substantially vertical, and rotatably supported by bearings.
[0011]
This dewatering device includes a casing accommodating a rotary perforated disk, and prevents the small pieces and water droplets from scattering outside the device, thereby facilitating the collection and collection of the small pieces and separated water droplets. It is preferable that the casing is provided with a seal member that shields at the peripheral surface of the rotary perforated disk as a boundary, so that the spraying side and the drainage side are shut off and shielded from each other.
[0012]
It is preferable that a strip collecting section of the strip collecting means be provided on the spraying side of the rotary perforated plate below the casing, and a water collecting section for collecting separated water droplets be provided on the drain side.
[0013]
Such a casing prevents the debris and water droplets from being scattered, and the seal member ensures that the dehydrated debris is collected in the debris collection part and water is collected in the water collection part. In addition, it is possible to prevent water droplets scattered on the drain side from returning to the spray side.
[0014]
The casing is not necessarily a closed container, and air can be discharged from the strip collecting means or the strip collecting section, or from the water collecting section. Preferably, a discharge valve is connected on the drain side. When the pressure inside the casing is high in accordance with the amount of air blown from the strip blowing means, it is preferable to adjust the degree of opening and closing of the discharge valve to diffuse air from inside the casing to the outside of the device. Dispersing the air to the discharge side can effectively blow the small pieces to the rotary perforated disk at a high air flow rate.
[0015]
A guide shoe may be provided inside the casing for slidably supporting and guiding the outer periphery of the rotary perforated plate on the drainage side over the vicinity of the strip spraying means. The position on the rotary perforated disk where the wet fine particles are sprayed by the fine particle spraying means is pressed strongly to the drainage side by the wind pressure of air and the collision of the wet and large masses. Since the periphery of the disk is supported, distortion of the rotary perforated disk can be suppressed to a minimum.
[0016]
Further, it is preferable to provide an air blow-off means, for example, a blower, for blowing air from the drainage side of the rotary perforated plate to the plate surface to separate small pieces. The air flow for blowing down is blown out toward a different board surface from the above-mentioned small piece spraying means so that the small pieces attached to the rotary perforated board are blown down to the above-mentioned spraying side.
[0017]
On the spraying side, the small pieces that are sprayed on the rotary perforated plate and adhere and do not fall down after dehydration are removed from the drainage side at another location on the rotary perforated plate until the next spraying is performed after orbiting. The strips are forcibly separated and dropped by the air flow of the air blow-off means, and the strips can be continuously and effectively dewatered.
[0018]
The board surface of the porous body constituting the rotary porous board is preferably such that the porous body is separated from the small pieces while allowing water to pass through, using a mesh porous body smaller than the small pieces to be dewatered. If the porous body has sufficient strength, it can be used alone as a rotary porous disk. On the other hand, when the porous body is flexible and needs to be reinforced, the rotary perforated disk includes a circular frame forming a frame, a plurality of reinforcing ribs intersecting at the center from the circular frame, and It is composed of a frame and a porous body that is replaceably stretched with a plurality of ribs, and the above-mentioned wire mesh, other highly permeable screens, filters, and the like can be used for the porous body.
[0019]
Such a rotary perforated disk usually has a disk shape, and the above-described structure using a circular frame is circularly symmetric and can provide a good rotational balance, and sprays wet strips with radial ribs. The water and the strips can be separated while maintaining the strength that withstands water. Further, the above-described structure using the circular frame has an advantage that a wire mesh having an appropriate mesh size or a punching metal having a hole size can be appropriately replaced according to the size of the strip.
[0020]
The strip spraying means may utilize a blower or an ejector that mixes the water-containing strip supplied at a constant supply speed with air and blows out the air-flow with the air stream.
[0021]
In particular, a metering means is connected to the strip spraying means, and the blower or the ejector sucks the wet strip supplied from the metering means and blows it together with the air flow. The ejector is used for spraying highly adherent small pieces, and a blower is suitable for small adherent and easily dispersed pieces. In addition, a screw feeder can be suitably used for transferring and cutting out the wet strips in the constant-quantity supply means, and by supplying the wet strips to the dehydrating apparatus in a constant amount, the strips after the treatment are generally constant. A low dehydration rate can be achieved.
[0022]
The multistage dewatering equipment of the present invention can be configured by connecting the strip dewatering equipment of the above embodiment in a plurality of stages. This multi-stage dewatering equipment is configured to connect the strip collecting section of the former-stage dehydrator to the strip spraying means of the latter-stage dehydrator so as to be multi-stage, thereby sequentially dehydrating the strip in each stage. It is intended to increase the dewatering rate and dewater the final strip to a substantially dry state.
[0023]
To the strip spraying means of the first-stage strip dewatering device, a predetermined amount of the wet strip is supplied from the quantitative supply means, and to the spraying means of the second-stage strip dewatering device, from the first-stage strip collecting means. The strip which has been dehydrated once is supplied, and the strip from the preceding strip dehydrator is similarly supplied to the subsequent strip dehydrator to be dehydrated. Thus, the water content can be further reduced by the multistage dehydration operation.
[0024]
【Example】
FIGS. 1 and 2 show the outline of a strip dewatering apparatus. This embodiment shows an example in which a wet strip is applied to a plastic strip P having a specific gravity separated in water of about 5 to 30 mm square. .
[0025]
In the strip dewatering apparatus of this embodiment, a rotary perforated disk 10 is fixed to a horizontal axis and rotatably disposed in a closed casing 40, and a rotary porous disk is provided on a side surface of the casing with the rotary perforated disk as a boundary. A blowing blower 20 as a small piece spraying means is fixed to the surface of the disk 10 on the spraying side, while the side surface of the casing 40 on the opposite side is directed to the surface of the rotary perforated disk 10 on the drain side. A blow-down blower 30 is disposed as air blow-off means. At the lower part of the casing 40, a strip collecting section 41 of the strip collecting means is provided below the spray side of the rotary perforated plate 10, and a water collecting section 43 is provided below the drain side.
[0026]
In this example, the rotary perforated disk 10 has a disk shape in which the disk surface is generally flat, and a central portion 13 is coupled to a horizontal rotary shaft 17. The horizontal rotary shaft 17 is rotatable by a bearing B. It is supported and is rotationally driven by a motor 19.
[0027]
In this example, the rotary perforated disk is arranged such that the disk surface forms a vertical surface. The rotary perforated disk is rotationally driven at a speed of 10 to 50 rpm in this example.
[0028]
The rotary perforated disk 10 includes a circular frame 12, a plurality of ribs 14 intersecting at a central portion 13, and a circular porous body stretched so as to be replaceable with the circular frame 12 and the plurality of ribs 14. In this example, a wire mesh disk 15 is used for a circular porous body.
[0029]
Inside the casing 40, a seal member 45 that is in contact with the disk peripheral surface 11 of the rotary perforated disk 10 is provided. A seal member 45 covers the outer periphery of the rotary perforated disk 10 and divides the internal space of the casing 40 into a spray side and a drain side.
[0030]
In this strip dewatering apparatus, a blowing blower 20 is used as strip blowing means, and a discharge nozzle fixed to the blowing blower 20 is directly fixed to a side wall of the casing 40 as shown in FIG. Then, a mixture of wet pieces P and air is sprayed from a spraying side toward a part of the surface of the rotary perforated disk 10.
[0031]
The spraying means 20 is supplied with a predetermined amount of wet strips P from the quantitative supply device 5 to the blowing blower 20. The quantitative supply device 5 is cut out from the hopper that receives the wet strip and is supplied to the blower suction port by a screw conveyor, and the blower 20 discharges the strip sucked together with the air through the nozzle toward the rotary perforated disk. The perforated disk allows water to pass through the pores 10a of the rotary perforated disk 10 (that is, the mesh of the wire mesh disk 15 in this example) to the drainage side, thereby separating the small pieces P and the water W. By the quantitative supply of the strips by the quantitative supply device, the strips can be evenly dispersed on the rotary perforated disk 10 so as not to overlap as much as possible, so that a constant dehydration action is always performed.
[0032]
In this embodiment, a blow-down blower 30 is provided as a blow-down means on the drain side surface of the rotary perforated disk 10 of the casing. The blow-down blower 30 blows high-speed air onto the surface of the porous body of the rotary porous disc from the dehydration side, and blows off the small pieces P attached to the rotary porous disc 10 to the spray side. In this case, the spraying position I2 of the blow-down blower 30 with respect to the rotary perforated disk is set on the rotation direction side of the perforated disk with respect to the position I1 of the blowing blower 20, and the blow-off position is set as the rotary perforated disk 10 rotates. The small pieces P moving to the blow-down position I2 can be effectively blown down to the spray side.
[0033]
The strip collecting means has a container-shaped strip collecting section 41 disposed directly below the rotary perforated plate on the spraying side in the casing 40, and as described above, the strip 7 separated from the rotary perforated plate and the like. The strip P blown down from the wire mesh surface of the wire mesh disk 15 by the blow-down blower 30 is received. 1 and 2, the strip collecting means includes a screw conveyor 41a of a collecting machine connected to the bottom of the strip collecting section 41, and the strip P collected by the strip collecting section 41 is a screw. It is discharged from the conveyor 41a through its outlet 41b and collected.
[0034]
A water collecting portion 43 in the form of a container is provided immediately below the rotary perforated plate on the drainage side in the casing 40 to collect water separated through the rotary perforated plate. It is discharged from the outlet 43B of the collecting part 43.
[0035]
In this embodiment, discharge valves 46 and 47 are connected to the casing 40 on the spray side and the drain side, respectively, to discharge air to the atmosphere side and reduce the internal pressure of the casing. In the discharge valves 46 and 47, the opening / closing degree of the discharge valves 45 and 46 can be adjusted in accordance with the amount of air blown from the blowing blower. Can be adjusted, and the spraying of the small pieces P on the rotary perforated disk 10 can be weakened or increased according to the type of the small pieces, the water content, and the throughput.
[0036]
A guide shoe 48a is provided between the casing 40 and the rotary perforated disk 10 near the surface area near the strip spraying means 20 on the drainage side and partially around the outer periphery of the rotary perforated disk 10. On the spraying side, a guide shoe 48b is provided near a part of the outer periphery of the rotary perforated disk 10 near the injection surface area of the blow-down blower 30.
[0037]
In the rotary perforated disk 10, generally, the surface area on which the wet debris is sprayed by the debris spraying means 20 is strongly pressed to the drainage side, and is opposed to the center 13 by the air flow from the blow-down blower 30. There is a strong tendency that the rotary perforated disk 10 is distorted by being pushed to the spraying side at some portions, but both the guide shoes 48a and 48b are fixed to the casing side, and the peripheral surface of the disk surface of the rotary perforated disk or the circular frame 12 The side surfaces are slidably supported and guided to prevent deformation.
[0038]
In the strip dewatering apparatus of another embodiment, the blow-down blower is omitted when the strip P has low adhesion. By setting the rotating perforated disk at a steep angle with the spraying side slightly downward, the dewatered strip is dropped by its own weight and centrifugal force into the strip collection section until it makes one round.
[0039]
Further, as shown in FIG. 3, a brush 51 for sweeping the surface of the rotary perforated disk may be fixedly provided, and the attached small pieces may be wiped off. In this example, by setting the small piece spraying position I3 with respect to the rotary perforated disk 10 and the removing position I4 of the dewatered strips P, even on the vertical rotary perforated disk 10, the spraying side is slightly downward and the steep angle rotation is performed. The dewatered strips P can be wiped off by the brush 51 even in the perforated plate 10.
[0040]
Further, FIG. 4 shows an embodiment of a multi-stage dewatering facility, which is configured by connecting a strip dewatering device as shown in FIG. 1 in a plurality of stages in series. In the example of FIG. 4, a multi-stage strip dewatering apparatus in which three-stage strip dewatering apparatuses are arranged is shown, but the strip collecting section 41 of the previous-stage dewatering apparatus is directly connected to the next-stage strip spraying means 20. Is done.
[0041]
In the three-stage arrangement, the strip spraying means 20 of the first-stage strip dewatering apparatus is supplied with wet strips P supplied from the quantitative supply device 5 by a fixed amount, and the spraying means of the second-stage strip dewatering apparatus. 20, the strip P once dehydrated is supplied from the strip collecting unit 41 of the first-stage strip dehydrator, and the second-stage strip dehydrator performs the second dehydration to finish the strip P. It is supplied to the spraying means 20 of the strip dewatering device of the stage, and is further dewatered by this final stage dewatering device to obtain a substantially dry strip. In this embodiment, the strip P in this state is collected by the cyclone type collector 55 as shown in FIG. 4 after the last-stage strip dewatering device.
[0042]
FIG. 5 shows an example of the behavior of the relative water content after dewatering in a multistage dewatering equipment, when the water content of the wet plastic strip before charging is 100% in relative water content. After the treatment in the first-stage strip dewatering apparatus, if the relative water content in the strip is dehydrated to about 20%, the strip P is reduced to about 10% in the second-stage strip recovery unit 41. In the third stage of dehydration treatment, the strip P reaches a relative moisture content of about 5%, and becomes almost dry.
[Brief description of the drawings]
FIG. 1 shows a schematic sectional view of a strip dewatering apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the strip dewatering apparatus according to the embodiment of the present invention, taken along line II-II in FIG.
FIG. 3 is an external view of a rotary perforated disk used in the strip dewatering apparatus according to the embodiment of the present invention.
FIG. 4 is a schematic view of a dewatering facility in which three stages of strip dewatering apparatuses according to the present invention are arranged in series.
FIG. 5 is a graph showing a behavior of a relative dehydration rate in each stage of a dehydration facility configured by arranging three stages of strip dewatering apparatuses according to the present invention in series.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 strip dewatering device 10 rotary porous disk 10 a pores 11 disk peripheral surface 12 circular frame 14 rib 15 wire mesh disk 17 rotary shaft 20 spraying blower 30 blowdown blower 40 casing 41 strip collecting section 43 water collection Part 45 sealing member 47 release valve 5

Claims (11)

A rotary perforated disk having a disk surface provided with a large number of through holes smaller in size than the strip, and the disk surface being rotated in a substantially vertical state,
A small piece spraying means for blowing a small piece containing moisture from the spray side toward the rotary perforated plate with an air flow, and blowing the moisture to the drain side through the hole of the rotary perforated plate,
Strip collecting means for receiving dehydrated strips falling from the rotary perforated disc on the spray side of the rotary perforated disc,
A strip dewatering device comprising: The dewatering device includes a casing that houses the rotary perforated disk,
The casing includes a seal member that shields a spray side and a drain side with respect to a peripheral surface of the rotary perforated board,
The strip dewatering device according to claim 1, wherein a strip collecting section of the strip collecting means and a water collecting section for collecting water on a drain side are arranged on the spraying side in the casing. 3. The strip dewatering apparatus according to claim 1, wherein the rotary perforated disk is connected to a horizontal rotary shaft, and the horizontal rotary shaft is rotationally driven by a drive motor coupled outside the casing. 3. The strip dewatering apparatus according to claim 2, wherein a discharge valve is connected to the drainage side of the casing. 3. The strip dewatering apparatus according to claim 2, wherein the casing includes a guide shoe that slidably supports and guides the outer periphery of the rotary perforated plate on the drainage side near the spraying means. Air that blows an airflow toward the rotary perforated disk at a location different from the strip blowing means on the drainage side of the rotary perforated disk to blow down the small pieces attached to the rotary perforated disk to the spraying side. 2. The strip dewatering apparatus according to claim 1, further comprising a blow-down means. 2. The rotary perforated disk according to claim 1, comprising a plurality of ribs intersecting at a center with the circular frame, and a wire mesh or a punched metal disk stretched so as to be replaceable with the circular frame and the plurality of ribs. Strip dewatering equipment. 7. The strip dewatering apparatus according to claim 1, wherein the strip spraying means comprises a blower or an ejector for sucking wet strips containing water and blowing them out together with an air flow. 9. The strip dewatering apparatus according to claim 1, further comprising a fixed-quantity feeding unit connected to the strip spraying unit and configured to supply the wet strip to the strip spraying unit at a desired supply speed. A multi-stage dewatering apparatus in which a plurality of strip dewatering devices are connected in series, wherein each of the strip dewatering devices is the strip dewatering device according to any one of claims 1 to 8, and the pre-stage strip dewatering device. A multistage dewatering facility in which the strip collecting means of the piece dewatering apparatus is connected to the piece spraying means of the next-stage dewatering apparatus, and the dewatered pieces are discharged from the piece collecting means of the last-stage piece dewatering apparatus. The multi-stage dewatering equipment according to claim 10, wherein the multi-stage dewatering equipment includes a quantitative supply means connected to the strip spraying means of the first-stage dewatering apparatus and supplying the wet fine particles to the strip spraying means at a desired supply speed. .

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