JP4252738B2 - Synthetic resin pellet dewatering equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin pellet dewatering apparatus that separates and collects pellets from a slurry, which is a mixture of pellets and hot water.
[0002]
[Prior art]
The manufacturing method of the pellets of synthetic resin is well known in the art without mentioning literature names, and is generally manufactured as follows. That is, the molten resin extruded from the kneader is cut into a predetermined size in high temperature water to obtain a slurry that is a mixture of pellets and hot water, and the pellet is cooled and solidified when the slurry is conveyed to a predetermined location, Product pellets are separated and collected on a screen. The dehydrator for separating and collecting the pellets from the hot water in this way includes a screen 50 as shown in FIG. The screen 50 is provided in a box 54 so as to be inclined in one direction, and a slurry supply port 51 is provided at an upper position of the screen 50 and a pellet discharge port 52 is provided at a lower side. Therefore, when a slurry composed of pellets and hot water is supplied from the slurry supply port 51, the pellets and hot water descend on the screen 50 due to gravity. At this time, the pellets are separated by the screen 50 to become “on the net”, are sent downward by gravity, and are discharged from the pellet discharge port 52 to the outside. On the other hand, the hot water falls to the lower part of the screen 50 and is drained from the drain port 53.
[0003]
[Problems to be solved by the invention]
As described above, the conventional dehydration method or apparatus for pellets uses gravity, so that it has the advantage of low running cost, and the structure is relatively simple and inexpensive, so that it is small scale. There is no particular problem in applying to a pellet manufacturing apparatus. However, if it is intended to be applied to a kneading machine having a large capacity, that is, a pellet manufacturing apparatus, the area of the screen 50 must be widened, so that there is a drawback that the dehydrating apparatus becomes large. As the apparatus becomes larger, the manufacturing cost increases and the transportation cost to the user also increases. Furthermore, the problem of installation space also arises. Further, although gravity is used for dehydration, the dehydration effect is not necessarily good because gravity in the vertical direction is merely used.
The present invention is intended to provide a synthetic resin pellet dewatering method and dewatering apparatus that eliminates the above-described conventional drawbacks or problems. Specifically, the present invention is compact and can be separated using gravity. Nevertheless, an object of the present invention is to provide a synthetic resin pellet dewatering method capable of treating a large amount of slurry and a pellet dewatering device used in the implementation of this method.
[0004]
[Means for Solving the Problems]
The above object of the present invention is to form the screen into a cylindrical shape having a predetermined length in the axial direction, and to feed slurry, which is a mixture of pellets and hot water, downward by gravity inside the screen, causing a swirl flow. This is accomplished by displacing the slurry towards the screen by centrifugal force when swirling, and separating it at the screen. At this time, the slurry is configured to rotate a plurality of times inside the screen. The screen is used for filtering pellets, and is composed of a wire mesh or punching plate having a mesh size smaller than the size of the pellets to be processed. The temperature of the slurry at the time of processing is not particularly limited. Thus, in order to achieve the above object, the invention according to claim 1 is a dehydrating apparatus for separating and recovering pellets from a slurry that is a mixture of pellets and hot water, and the dehydrating apparatus has a vertical direction. A cylindrical screen body having a predetermined length and a swirl plate fixedly disposed inside the screen body and swirlingly guiding slurry from above to below. The peripheral portion is in contact with the inner peripheral surface of the screen main body, and is formed of a spiral slope body continuously formed so as to become lower as it goes downward . The inside of the screen body is guided by the swivel plate and moves while swiveling downward due to gravity. At this time, the centrifugal force acting radially outwardly shifts toward the inner peripheral surface of the screen, thereby Configured as pellets in the slurry is separated and collected by the screen body Te.
Invention of Claim 2 is comprised in the spin-drying | dehydration apparatus of Claim 1 so that the said turning board may consist of a spiral slope body in which the side which contact | connects the said screen main body is lower than a center part , According to a third aspect of the present invention, in the dehydrating apparatus according to the first aspect, the diameters of the screen main body and the swivel plate become smaller toward the lower side .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG. The pellet dewatering apparatus according to the present embodiment includes a screen 1 having a predetermined length in the vertical direction or the axial direction, as shown in FIG. The screen 1 is formed in a cylindrical shape from a wire mesh or punching plate on which meshes 2, 2,. The lower end is open, but the upper end 3 is detachably fixed to the lid or the attachment member 4. A slurry guide body 10 for causing a swirl flow in the slurry is disposed inside the screen 1 configured as described above.
[0006]
The slurry guide 10 includes a shaft 11 having a predetermined length that also functions as a strength member, and a swivel plate 12 attached around the shaft 11. As shown in FIG. 1B, the swivel plate 12 is substantially horizontal when viewed in a horizontal section, but is formed in a continuous spiral shape so as to become lower as it goes downward, and the center. It is attached to the shaft 11 at the part. The peripheral portion 13 of the swivel plate 12 is selected to have a size in contact with the inside of the screen 1, and the lower end portion thereof is connected to the pellet discharge chute 14. The slurry guide body 10 configured as described above has an upper end portion of a shaft 11 attached to the attachment member 4 by bolts 15, 15. Thereby, in this Embodiment, the screen 1 and the slurry guide body 10 are unitized. A slurry supply pipe 5 is attached to the side of the attachment member 4.
[0007]
Although the pellets can be separated and collected by the unitized screen 1 and the slurry guide body 10 as described above, a separation case 20 having a predetermined size is provided in the present embodiment. Then, the unitized screen 1 and the slurry guide 10 are inserted into the inside of the separation case 20 from above, and the mounting member 4 is placed and fixed on the upper edge 21 of the separation case 20, thereby dehydrating the pellet. Can be assembled. A hot water drain 22 is provided at the lower end of the separation case 20.
[0008]
Next, the operation of the pellet dehydrating apparatus will be described. A slurry which is a mixture of pellets and warm water sent from the pelletizer is supplied onto the swivel plate 12 from the slurry supply pipe 5. The slurry flows downward on the swivel plate 12 mainly by gravity. At this time, since the slurry is continuously supplied, a force that is pushed by the subsequent slurry also acts on the preceding slurry. When the slurry flows downward, centrifugal force acts on the slurry, and the slurry becomes a flow shifted toward the screen 1 as shown in FIG. Thereby, the hot water is drained to the outside of the screen 1. The pellet remains inside the screen 1. This separation action is continuously performed from the upper end of the screen 1 to the lower end. The dehydrated pellet is collected from the pellet discharge chute 14 connected to the lower end of the swivel plate 12. The hot water is collected downward by the separation case 20 and drained to the outside from the hot water drain 22 at the lower end.
[0009]
The present invention is not limited to the above embodiment and can be implemented in various forms. For example, since the slurry is shifted toward the inner peripheral surface of the screen 1 by centrifugal force and flows downward, the influence of the central shaft 11 on the dehydration effect is small. Therefore, in the present embodiment, the diameter of the shaft 11 is relatively large and is used as a strength member, but it is obvious that the present invention can be implemented without the shaft 11. Further, the swivel plate 12 can also have a side 12 ′ that contacts the screen 1 shown in FIG. Thereby, the flow of the slurry can be further offset toward the screen 1. Further, the turning radius can be reduced by decreasing the diameter of the turning plate 12 as it goes downward. At this time, the diameter of the screen 1 is also reduced as it goes downward. In addition, the axial center can be slightly tilted, and the centrifugal force can be increased or decreased depending on the position in the circumferential direction. Thereby, the swirl flow is disturbed and the slurry is stirred and dehydrated uniformly.
[0010]
【The invention's effect】
As described above, according to the present invention, a cylindrical screen body having a predetermined length in which a dehydrator for separating and recovering pellets from a slurry, which is a mixture of pellets and hot water, is disposed in the vertical direction, and the interior of the screen body. The swivel plate is fixedly disposed on the swivel plate and pivotally guides the slurry from above to below, and the swirl plate comes into contact with the inner peripheral surface of the screen main body and is lowered as it goes downward. The slurry that is formed from a spiral slope body that is continuously formed so that the slurry supplied from above moves while being swung downward by gravity while being guided by the swivel plate inside the cylindrical screen body. At this time, the centrifugal force acting radially outwardly shifts toward the inner peripheral surface of the screen, whereby the pellets in the slurry are separated and collected by the screen body. Since so as to be, that is, the screen body is in cylindrical shape, the projected area or installation space can broadly be the filtration area narrow, and because the centrifugal force is utilized, even though the more compact Therefore, an effect peculiar to the present invention that a large amount of slurry can be processed is obtained. In addition, according to the present invention, the synthetic resin pellet dewatering apparatus is configured in a compact manner, so that an effect of reducing the transportation cost to the user can be obtained. Furthermore, since the swirl plate is fixedly arranged without being driven and swirls to separate the slurry by gravity, there is an advantage that the running cost is hardly required.
According to another aspect of the invention, the swirling body is formed of a spiral slope body whose side contacting the screen main body is lower than the central portion. Can be further offset. According to still another invention, since the diameters of the screen body and the swivel plate are smaller as they go downward, the centrifugal force becomes larger as they go downward .
[Brief description of the drawings]
FIG. 1 is a view showing a synthetic resin pellet dehydrating apparatus according to an embodiment of the present invention, in which (a) is a sectional view showing the whole, and (b) is viewed in the direction of the arrow in FIG. FIG.
FIG. 2 is a front view showing a conventional example with a partial cross section.
[Explanation of symbols]
1 screen 2 mesh 10 slurry guide 12 swivel plate (slope)
13 Perimeter

Claims (3)

A dehydrator for separating and recovering pellets from a slurry that is a mixture of pellets and hot water,
The dewatering device comprises a cylindrical screen body having a predetermined length arranged in the vertical direction, and a swivel plate fixedly disposed inside the screen body and for swirlingly guiding slurry from above to below. ,
The swirl plate is a slurry that is formed from a spiral slope body that is continuously formed so that its peripheral portion is in contact with the inner peripheral surface of the screen main body and becomes lower as it goes downward. Is moved while being swung downward by gravity guided by the swivel plate inside the cylindrical screen body, and at this time, it is displaced toward the inner peripheral surface of the screen by a centrifugal force acting radially outward. , Whereby the pellets in the slurry are separated and collected by the screen body, and the synthetic resin pellet dewatering apparatus. 2. The dehydrating apparatus according to claim 1, wherein the swivel plate is formed of a spiral slope body whose side in contact with the screen main body is lower than a central portion . The dehydrating apparatus according to claim 1, wherein the diameters of the screen body and the swivel plate are smaller as they go downward .

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