JP2514110B2 - Classifying and cooling machine for synthetic resin molding particles - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

TECHNICAL FIELD The present invention relates to a classifying and cooling machine for synthetic resin molded particles, in which synthetic resin molded particles (pellets) such as vinyl chloride resin extruded by an extruder are cooled and classified according to particle size.

[Prior art]

Synthetic resin molding particles (pellets) such as vinyl chloride resin used as a coating material for electric wires are formed by an extruder, but the molding particles immediately after extrusion have a high temperature of 150 to 200 ° C, so cool them to about room temperature. After that, it is classified according to the particle size. Conventionally, as a method of cooling such high-temperature molded particles, an air cooling type and a water cooling type are known. FIG. 5 is a block diagram showing the configuration of an air-cooling type classifying cooler, in which hot synthetic resin molding particles extruded from the extruder 1 are cut into a predetermined size by a hot cutting device 2 to form hot cut pellets. Becomes The hot-cut pellets are pressure-fed to the primary cooling cyclone 4 by the high-pressure air of the pressure blower 3, and are primary-cooled by the cooling air from the primary cooling auxiliary blower 5 there. The primary cooled pellets are introduced into the flow chamber 6, where they are retained and then sent to the air cooling tower 7 to be air cooled. At this time, the airflow at the inlet of the air cooling tower 7 is sucked by the exhaust blower 9 through the dust collector 8 to remove dust and the like adhering to the pellets. The pellets cooled in the air cooling tower 7 fall onto a vibrating sieving machine 10 arranged below the air cooling tower 7, and vibrate by being vertically vibrated by a vibrator 11. Then, since the larger the particle size is, the lower the jumping height is, the barrier in the height direction falls from the classification hole 12 having the smallest height, and the medium size particle has the classification hole 13 having the next lowest barrier in the height direction. The particles having the smallest particle diameter fall from the classification hole 14 having the highest barrier. As a result, the particles are classified into large, medium and small particle sizes. FIG. 6 is a block diagram showing the configuration of a water-cooling type classifying cooler, in which hot synthetic resin molding particles extruded from the extruder 1 are cut into a predetermined size by the hot cutting device 2 to form hot cut pellets. Becomes The hot-cut pellets are cooled by being sprayed with cooling water supplied from the self-priming pump 16, and then sent out to the transport pipe 17. At this time, the warmed cooling water drops from the sluice 18 provided in the middle of the transport pipe 17, is passed by the overrun 20 of the overheated hot water tank 19, and is then collected. Cold water is constantly supplied to the hot water tank 19 with an engine through a valve 21, and a drain pipe 22 is attached above the side wall of the tank. As a result, even if the warm cooling water is collected from the sluice 18, the cooling water having a temperature equal to or lower than a certain temperature can be constantly supplied to the hot cut device 2 through the self-priming pump 16. The pellets that have passed through the slur 18 are introduced into a centrifugal dryer 23, where they are dehydrated and dried by a centrifugal action. After that, it is introduced into a vibration sieving machine, where it is vibrated in the same manner as in the case of the air cooling type, so that it is classified into large, medium, and small particle sizes, and is recovered from the classification holes 25, 26, 27. .

[Problems to be Solved by the Invention]

However, in the above air-cooled classifying chiller, there are many stages of air feeding from the outlet of the hot cut device 2 to the vibrating sieving machine 10, so cleaning must be performed over a wide range when changing the color of pellets or changing the product type. Moreover, there is a problem that the quality becomes unstable due to the residue of the previous product. Further, there is a problem that the setup time becomes long and the efficiency is low. On the other hand, in a water-cooled classifying chiller, it is necessary to constantly supply cooling water at a certain temperature or lower, so that securing and water treatment of water becomes a big problem, and there is a problem of cost increase. Further, since the pellets come into direct contact with the cooling water, there is a risk that the quality will be deteriorated by moisture absorption. The present invention has been made in view of the above circumstances, and is excellent in cleaning property, and it is possible to cool and classify synthetic resin molding particles of various types and multicolors efficiently and at low cost without degrading the quality. An object of the present invention is to provide a classifying cooler of synthetic resin molding particles that can be used.

[Means for Solving the Problems]

In order to achieve the above object, the classifying cooler of the synthetic resin molded particles of the present invention has a bottom plate 33 in which a plurality of vent holes 32 having a diameter smaller than the molding particle size of the synthetic resin are formed, and the bottom plate 33 A retention tank 31 on which the molding particles of the synthetic resin are retained, and the bottom plate.
A cooling air is blown from below 33, and the cooling air is supplied into the retention tank 31 through the plurality of ventilation holes 32 to cool the synthetic resin molding particles retained in the retention tank 31. And one end of the bottom plate 33 is attached to one side of the bottom plate 33, and the partition plate 35 is provided so that the other open end of the bottom plate 33 is slanted so as to expand toward the upper side of the retention tank 31.
And a vibrating means 39 for vibrating the retention tank 31, and a plurality of types of classification holes sequentially formed on the lateral side of the upper end of the partition plate 35.
A classifying plate 40 for classifying the synthetic resin molding particles that have passed over the upper end portion of the partition plate 35 into a plurality of particle sizes by 41 and 42. The partition plate 35 is preferably configured so that the height from the position of the upper surface of the bottom plate 33 to the upper end can be changed. Further, it is preferable that the partition plate 35 is configured to be removable from the retention tank 31. Further, it is preferable that the retention tank 31 is provided with a stirring means for stirring the synthetic resin molded particles.

[Action]

According to the above configuration, the synthetic resin molded particles are introduced into the retention tank, where they are cooled by the cooling air blown from below the bottom plate in a vibrating state. The cooled molding particles move toward the partition plate while vibrating. Then, except for the specially oversized granules, many granules get over the upper end of the partition plate and reach the position of the classifying means. Then, here, the particles are classified according to the particle size by a plurality of kinds of classification holes.

【Example】

Hereinafter, the classifying cooler of the synthetic resin molded particles of the present invention will be described based on Examples. FIG. 1 is a block diagram showing an embodiment of a classifying cooler of the present invention, in which hot synthetic resin molding particles extruded from an extruder 1 are cut into a predetermined size by a hot cut device 2 and hot cut. It becomes pellets. The hot-cut pellets are pressure-fed to the primary cooling cyclone 4 by the high-pressure air of the pressure-fed blower 3, and are primary-cooled there. The primary cooled pellets are classified by the classifying cooler 30 of this embodiment.
Be led to. FIG. 2 is a front view and a side view showing the detailed configuration of the classification cooling machine 30 of the present embodiment, and FIG. 3 is an exploded perspective view of the retention tank. In these figures, 31 is a retention tank in which a plurality of vent holes 32 having a diameter smaller than the particle size of the pellets primarily cooled by the cyclone 4 are formed, as shown in FIG. 2 (b),
As shown in FIG. 3, it has a U-shaped bottom plate 33,
The bottom plate 33 is for retaining the pellets. Bottom plate 33 on the left side wall of the retention tank 31 shown in FIG. 2 (a)
A cooling air blowing opening 34 for blowing cooling air is provided at a lower position. Further, a partition plate 35 is provided on one right side portion of the retention tank 31 shown in FIG. 2 (a), and an open end portion of the partition plate 35 above the mounting end portion on the bottom plate 33 side is provided. In the opening direction, that is, the opening of the upper part of the partition plate 35 is inclined (inclined to the right in FIG. 2 (a)) so as to expand toward the upper part of the retention tank 31. The retention tank 31 is supported on a frame 36 via four springs 37 so as to be vertically vibrable. 38 blows cooling air from the cooling air blowing port 34,
A blower that cools the pellets retained in the retention tank 31 from below the bottom plate 33, a vibrator 39 that vertically vibrates the retention tank 31, and 40 is formed in order on the right side of the upper end of the partition plate 35. A classifying plate for classifying the pellets that have passed over the upper end of the partition plate 35 into two particle sizes by the classifying holes 41, 42 having different kinds of hole diameters φa, φb (φa <φb).
Below, there is a fine particle outlet 43 for collecting pellets with a fine particle size that passes through this hole 41, and below the classification hole 42, an appropriate particle size that drops through this hole 42. An appropriate grain outlet 44 for collecting the pellets is provided. And
In front of the classification hole 42, a coarse-grain outlet 45 for collecting pellets of coarse particle size that could not pass through both classification holes 41, 42.
Is provided. The partition plate 35 arranged on one right side of the retention tank 31 has concave cutout windows 46 and 47 formed in the upper and lower portions, and these windows 46 and 47 can be opened and closed by the upper opening and closing plates 48 and 49, respectively. In addition, it can be detachably fixed in a fixing groove 52 formed inside the bottom plate 33. Reference numeral 50 denotes a pellet charging port placed on the upper part of the retention tank 31, a pellet charging port 51 formed at the center is connected to the outlet of the cyclone 4, and the pellets cooled first from the pellet charging port 51 are retained. Guided into tank 31. When the pellets extruded from the extruder 1 are cooled and classified in the classifying cooler configured as described above, the blower 38 is operated and cooling air is blown from the cooling air blowing port 34 to the U-shaped bottom plate 33. Blow downwards. Further, the vibrator 39 is operated to vibrate the retention tank 31 in the vertical direction. In this state, the pellets are extruded from the extruder 1. Then, the pellets are cut into a predetermined size by the hot cut device 2, and then introduced into the cyclone 4 by the high pressure air of the pressure blower 3 and are primarily cooled there. The primary cooled pellets drop from the pellet inlet 51 onto the bottom plate 33 of the U-shaped side cross-sectional shape of the retention tank 31.
Among the dropped pellets, the fine pellets having a diameter smaller than the diameter of the ventilation hole 32 of the bottom plate 33 fall below the bottom plate 33, and the fine grain outlet 53
Be recovered. However, many pellets stay on the bottom plate 33 while vibrating vertically. Then, in this staying state, it is cooled by the cooling air blown from below the bottom plate 33 through the ventilation holes 32. When the amount of retained pellets increases and the retained height reaches near the upper end of the partition plate 35, the cooled pellets in the upper layer move toward the partition plate 35 while vibrating due to vibration by the vibrator 39. Moving. Then, except for the special oversized pellets, the upper layer pellets are
It goes over the upper end of the and falls to the position of the classifying plate 40. Then, here, the classification is first performed by the classification hole 41 having the smaller diameter and then the classification hole 42 having the larger diameter is provided in front of the classification hole 41. As a result, pellets smaller than the diameter φa of the classification hole 41 fall from the classification hole 41 and are collected from the fine particle outlet 43. Further, pellets larger than φa and smaller than the diameter φb of the classification hole 42 fall from the classification hole 42 and are recovered from the suitable grain outlet 44. Further, coarse pellets larger than φb are collected from the coarse grain outlet 45. If the layer thickness of the pellets retained in the retention tank 31 is too large, the cooling air may not reach the upper layer, and the cooling may become uneven.In this case, remove the upper opening / closing plate 35. , Lower the height to the upper end of the partition plate 35,
Cooling may be performed in a state where the retention height is low. Further, if pellets of another type or color remain on the bottom plate 33 or the classification plate 40 at the beginning of cooling or at the end of cooling, the lower opening / closing plate 49 or the partition plate 35 as a whole is replaced by the bottom plate 33.
And blow out high-pressure air from the blower 38. As a result, the pellets of other types or colors remaining on the bottom plate 33 and the classification plate 40 are blown away by the high pressure air and cleaned in a clean state. Therefore, the cleaning property is extremely excellent. As described above, in this embodiment, since the cooling classification of the pellets is performed by the air-cooling method only in the retention tank 31, it is possible to perform the cooling classification at low cost without deteriorating the quality due to moisture absorption. Further, since the retention plate 31 has a simple structure in which the bottom plate 33 having the ventilation holes 32 is disposed, cleaning is easy and setup is also easy. Therefore, it is possible to efficiently and inexpensively cool and classify pellets of various kinds and multicolored goods. Furthermore, the degree of cooling can be changed by changing the retention height of the retention tank 31 as needed. 4 (a) and 4 (b) are a front view and a side view of a retention tank showing another embodiment of the present invention, in which an agitator 54 for agitating the inside of the retention tank 1 is provided. The stirring tank 54 has a U-shaped bottom plate from the upper end of the retention tank 31.
A plurality of stirring blades 55 protruding toward the inside of 33, a rotating shaft that coaxially connects the rotating centers of these stirring blades 55, and one end of this rotating shaft 56 absorbs vertical vibration. It is composed of a frame-side turning shaft 58 connected via a mechanism 57, and a hydraulic cylinder 60 for turning the turning shaft 58 at a turning angle of about 45 degrees when the arm 59 is viewed from the side. . In addition, from FIG.
The same or corresponding parts as those in the embodiment of FIG. 3 are designated by the same reference numerals. In this embodiment, when the hydraulic sylinder 60 is reciprocated, the rotating shafts 58, 56 recover within a rotation angle range of about 45 degrees when viewed from the side, so that the stirring blade 55 is within a range of about 45 degrees. Reciprocates. As a result, the pellets retained in the retention tank 31 are agitated, and cooling is performed uniformly and quickly. As a result, even if the pellets have high adhesiveness, the pellets do not adhere to each other to form a lump, and the pellet lump prevents the accident that the outlet of the classifying plate is clogged, and the continuous And stable operation can be performed. Although the classification is performed by using the holes for classification, it may be performed by a slit having a size corresponding to the particle size to be classified.

【The invention's effect】

As is clear from the above description, according to the classifying cooler for synthetic resin molded particles of the present invention, the synthetic resin has a bottom plate having a plurality of vent holes each having a diameter smaller than the molding particle size of the synthetic resin. A retention tank for holding the molding particles of the synthetic resin on the top, and a cooling air blown from below the bottom plate, and the cooling air is supplied to the inside of the retention tank through the plurality of ventilation holes to the retention tank. An air blower that cools the molding particles of the synthetic resin that has been retained, and one end of the bottom plate is attached to one side of the bottom plate, and the other open end of the blower spreads above the retention tank. The upper end portion of the partition plate is formed by a partition plate that is inclined, a vibrating means that vibrates the retention tank, and a plurality of types of classification holes that are sequentially formed laterally to the upper end portion of the partition plate. A classifying plate that classifies the surplus synthetic resin molding particles into multiple particle sizes Ete since the configuration, excellent cleaning property, many kinds, the synthetic resin molded particle multicolor products efficiently, and inexpensively cool without reducing the quality, it can be classified. Further, in the structure in which the height from the bottom plate surface of the partition plate to the upper end portion is variable, the retention height of the retention tank can be changed as necessary to change the cooling degree. Also, when the partition plate is configured to be removable from the retention tank, the molding particles remaining on the bottom plate, etc. are blown off by cooling air to complete the cleaning very easily and to cool the molding particles of the next type or color. , It is possible to shift to classification work. Furthermore, when a stirrer for stirring the molding particles is provided in the retention tank, the cooling efficiency is improved, a uniform cooling effect is obtained, and the classification processing speed can be increased, and the molding with higher adhesiveness can be achieved. Even if it is a particle, it will not happen that the molded particles will adhere to each other and become a soul, and the accident such as the exit of the classifying plate being clogged by the molded particle agglomerates will be prevented, and continuous and stable operation will be performed. It is possible to obtain effects such as being able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 1 is a front view and a side view showing the detailed construction of the classification cooling machine of the embodiment shown in FIG. 1, FIG. 3 is an exploded perspective view of a retention tank, and FIG. 4 is a front view showing another embodiment of the present invention. FIG. 5 is a side view, FIG. 5 is a block diagram showing a conventional structure of an air-cooling type classifying cooler, and FIG. 6 is a block diagram showing a conventional structure of a water-cooling type classifying cooler. 1 …… Extruder 2 …… Hot cut device 3 …… Pressure blower 4 …… Cyclone 7 …… Air cooling tower 8 …… Dust collector 10,24 …… Vibration sieving machine 11,39 …… Vibrator 19 …… Hot water with excess machine Tank 23 …… Centrifugal dryer 30 …… Classification cooler 31 …… Standing tank 32 …… Vent hole 33 …… Bottom plate 34 …… Cooling air blowing port 35 …… Partition plate 36 …… Stand 37 …… Spring 38 …… Blower 40 …… Classification plate 41,42 …… Classification hole 43 …… Fine grain outlet 44 …… Suitable grain outlet 45 …… Coarse object outlet 46 …… Concave cutout window 47 …… Concave cutout window 48 …… Top Open / close plate 49 …… Lower open / close plate 51 …… Pellet inlet 54 …… Stirrer 55 …… Stirring blade 60 …… Hydraulic cylinder

Front page continued (72) Inventor Tadashi Koto 652 Yazaki Electric Wire Co., Ltd. in Gotemba City, Shizuoka Prefecture (72) Inventor Kiyoshi Ono 652 Yaho Electric Wire Co., Ltd. in Gotemba City, Shizuoka Prefecture (72) Inventor Takekoshi Yoshimi 652 Hodosawa, Gotemba City, Shizuoka Prefecture Yazaki Electric Wire Co., Ltd.

Claims (4)

(57) [Claims] 1. A retention tank 31 having a bottom plate 33 in which a plurality of vent holes 32 having a diameter smaller than the synthetic resin molding particle size are formed, and a retaining tank 31 for retaining the synthetic resin molding particles on the bottom plate 33, Cooling air is blown from below the bottom plate 33, and the cooling air is supplied into the retention tank 31 through the plurality of ventilation holes 32 to form the molding particles of the synthetic resin retained in the retention tank 31. A fan for cooling, one end of which is attached to one side of the bottom plate 33,
A partition plate 35 provided with an inclination so that the open end of the other side spreads upward of the retaining tank 31, a vibrating means 39 for vibrating the retaining tank 31, and an upper end of the partition plate 35. A classifying plate 40 for classifying the synthetic resin molding particles that have passed over the upper end portion of the partition plate 35 into a plurality of particle sizes by a plurality of types of classification holes 4142 formed in order on the side of the part.
A classifying cooler for synthetic resin molding particles, which comprises and. 2. The classifying cooler for synthetic resin molded particles according to claim 1, wherein the partition plate 35 is configured so that the height from the position of the upper surface of the bottom plate 33 to the upper end thereof can be varied. 3. The classifying cooler for synthetic resin molded particles according to claim 1, wherein the partition plate 35 is configured to be removable from the retention tank 31. 4. A classifying cooler for synthetic resin molded particles according to claim 1, 2 or 3, wherein said retention tank 31 is provided with a stirring means for stirring the synthetic resin molded particles.