JPH0560813U - Underwater cutting granulator - Google Patents

Abstract

(57) [Abstract] [Purpose] An underwater cutting and granulating device that can easily and reliably discharge debris from the void by introducing a water flow into the center of the void formed between the die and the knife holder. I will provide a. A die having an annular surface in which a large number of nozzle holes are opened, and a rotating knife holder having a plurality of knives 13 traveling on the annular surface are arranged to face each other in a water chamber filled with a water stream, In an underwater cutting and granulating apparatus in which a void is formed between a die and a knife holder, a plurality of protrusions 1 curved toward the rotation direction R are provided on a knife holder surface 16a facing the void to easily scrape from the void, It has been designed so that it can be reliably discharged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an underwater cutting granulator for granulating a molten polymer material into a pellet shape or the like in a water chamber filled with a stream of water, and in particular, can easily and reliably remove scraps from a void formed between a die and a knife holder. Concerning what can be discharged to.

[0002]

[Prior Art]

 First, the overall configuration of the underwater cutting granulator will be described with reference to FIG. This underwater pelletizer comprises a die 11, a water chamber 12 filled with a water stream, and a knife holder 14 having a plurality of knives 13 attached thereto and rotating at a high speed. The die 11 has an annular surface 11a in which a large number of nozzle holes 11b for pushing out a molten polymer material pumped from a gear pump or the like (not shown) into the water chamber 12 are opened. In the water chamber 12, hot water for cooling and transferring the particulate matter cut by the knife 13 flows from the water chamber inlet 12a toward the water chamber outlet 12b. The knife holder 14 is held at the tip of a drive shaft 15 which is rotated by the drive of a motor (not shown), and a knife holder plate 16 is fixed to the front surface thereof. As shown in FIGS. 12 and 13 (cross-sectional view taken along the line EE in FIG. 12), the knife holder plate 16 is provided with a plurality of notch 16a for attaching a knife at equal circumferential positions. Is positioned in the notch 16a and fixed to the knife holder 14. The knife holder 14 and the dice 11 are arranged opposite to each other in the water chamber 12 so that the plurality of knives 13 travel while contacting the annular surface 11a of the die 11 by the rotation of the drive shaft 15.

Next, the granulation work of the underwater cutting granulator having such a structure will be described with reference to FIG. Molten polymer material pumped from a gear pump or the like is extruded into a water chamber 12 filled with warm water from a large number of nozzle holes 11b opening in the annular surface 11a of the die 11. Then, the molten polymer material extruded into the water chamber 12 is immediately cut by a knife 13 which is in contact with the annular surface 11a of the die 11 to run and granulated into pellets or the like. The granular material cut by the knife 13 is cooled by warm water, washed away by the water chamber outlet 12b, and conveyed to a centrifugal dryer (not shown).

In this underwater cutting granulator, the cutting blade 13a of the knife 13 that travels in contact with the annular surface 11a of the die 11 gradually wears as the granulating work progresses, and the knife holder 14 moves toward the die 11 side. Pushed out. Therefore, a gap 17 is provided between the die 11 and the knife holder plate 16 to prevent interference between the die 11 and the knife 13. The knife 13 is rotating at a high speed, and the gap 17 becomes a negative pressure due to the propeller action. On the other hand, whiskers and the like of the polymer material are generated by the granulation work, but the specific gravity of this waste is lower than that of water, and once it enters the voids 17, it does not easily come out. As a result, dust is accumulated in the space 17, and if this dust adheres to the die 11 or the like, the cutting accuracy is disturbed. Therefore, conventionally, as shown in FIGS. 12 and 13 (F-F cross-sectional view of FIG. 12), the knife holder 14 and the knife holder plate 16 are rotated in the counter-rotational direction from the surface 14a on the opposite side of the gap 17 of the knife holder 14. The scraps are discharged from the gap 17 by opening a through hole 20 that extends obliquely toward the gap 17 side. In this, the water flow N is introduced into the space 17 by the suction action of the through hole 20 caused by the rotation of the knife holder 14, and the waste water is discharged from the space 17 by the water flow N.

[0005]

[Problems to be solved by the device]

 In the waste discharge from the void 17 by the through hole 20 of the underwater cutting granulator described in the conventional art, since the through hole 20 is oriented in the direction perpendicular to the radius, the water flow N is also oriented in the direction orthogonal to the radius. No water flow occurs in the center of the void 17. Therefore, the waste is not sufficiently discharged from the void 17, and the dust is still accumulated in the void 17. The waste is discharged from the gap 17 by providing a water feed hole 15a in the drive shaft 15 as shown in FIG. 15 and supplying hot water pressurized by a booster pump (not shown) to the center of the gap 17. There is also. However, the discharge of wastes through the water supply hole 15a has a problem that the structure of the entire device is complicated due to the water supply and the cost is increased.

The present invention has been made in view of the above problems of the conventional technique, and the purpose thereof is to easily and surely discharge the debris that tends to stay in the void. It is intended to provide an underwater cutting granulator.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned object, the underwater cutting granulator of the present invention is a rotating knife having a die having an annular surface with a large number of nozzle holes and a plurality of knives running on the annular surface. In a submersible cutting granulator in which a holder and a water chamber filled with water flow are opposed to each other, and a gap is formed between the die and the knife holder, the knife holder surface facing the above-mentioned gap faces the rotation direction. It has multiple curved protrusions. Instead of the plurality of protrusions, the notch is opened toward the outer circumference of the knife holder and extends from the inside of the knife holder surface facing the void toward the outside of the knife holder surface opposite to the void and expands in the direction of rotation. It is also possible to provide a plurality. Further, instead of the above-mentioned plurality of protrusions, a plurality of cutouts that open toward the outer periphery and widen in the rotation direction are provided on the knife holder surface on the side opposite to the gap, and the cutouts extend in the direction of the rotation axis of the knife holder. It is also possible to open an oblique through hole to the void side. Furthermore, a die having an annular surface with a large number of nozzle holes opened, and a rotating knife holder equipped with a plurality of knives held on a drive shaft and traveling on this annular surface are installed in a water chamber filled with water flow. In an underwater cutting granulator which is placed facing each other and has a gap formed between the die and the knife holder, a center hole communicating with the gap is provided in the knife holder or the drive shaft, and a compound hole extending from the center hole in the rotating direction of the knife holder is provided. It is also possible to open several inclined holes on the outer peripheral side of the knife holder or the drive shaft.

[0008]

[Action]

 The protrusions, notches or inclined holes form a blade groove that runs counterclockwise from the outside of the knife holder or the drive shaft toward the center.Therefore, a strong water flow automatically generated by the suction action due to the rotation of the knife holder is generated. Head towards the center of the void.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a protrusion provided on a knife holder plate of an underwater cut granulator of the present invention, and FIG. 2 is a view as seen from an arrow A in FIG. Since the whole structure of the underwater cutting granulator and its operation are the same as those described in FIG. 11, the protrusion provided on the knife holder plate of the underwater cutting granulator of the present invention will be described below. In FIGS. 1 and 2, parts having the same functions as those in FIG. 11 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1 and FIG. 2, a plurality of protrusions 1 are provided at circumferentially equidistant positions on a surface 16 a of the knife holder plate 16 fixed to the knife holder 14 on the side of the space 17. The protrusion 1 is curved in the rotation direction R from the inside to the outside of the knife holder plate 16, and its direction is opposite to that of the knife 13 attached to the knife holder 14 in the counter-rotational direction from the inside to the outside. is there. The projection 1 functions as a blade, and the projection 1 forms a blade groove 1a curved in the counter-rotational direction from the outside toward the center of the knife holder plate 16. Therefore, when the knife holder 14 is rotated in the R direction, a water flow J from the outside toward the center is generated by the suction action of the protrusion 1.

Next, the operation of the protrusions provided on the knife holder plate having the above structure will be described. A knife holder 14 having a plurality of knives 13 attached thereto is rotated at a high speed in a water chamber 12 filled with warm water to perform granulation work. At this time, due to the suction action of the projection 1, a water flow J 1 is generated from the outside to the inside of the knife holder plate 16, but since the blade groove 1a is formed toward the center, the water flow J is directed toward the center of the gap 17. .. As a result, chips such as whiskers of polymer material that are generated by the granulation work that tries to collect in the voids 17 are discharged from the voids 17, and the dusts collect in the voids 17 and adhere to dies and the like, thus degrading the cutting accuracy. Absent. When discharging the waste by the suction action of the projection 1 provided on the knife holder plate 16, it is not necessary to use a special device such as a pump, and the powerful water flow J automatically generated by the rotation of the knife holder 14 is generated in the gap 17. Since it is carried out by introducing it into the central portion, it is possible to easily and surely discharge the scraps that are trying to stay in the gap 17.

Further, as shown in FIGS. 3 and 4 (viewed from the arrow B in FIG. 3), a plurality of notches 2 are provided at equally circumferential positions on the knife holder 14 and the knife holder plate 16, and the notches 2 are provided. It is also possible for 2 to be a vane groove that runs counterclockwise from the outside toward the center. The notch 2 opens toward the outer circumference of the knife holder 14 and the knife holder plate 16, and extends from the inside of the surface 16a of the knife holder plate 16 on the side of the gap 17 to the outside of the surface 14a of the knife holder 14 on the side opposite to the gap 17. When the knife holder 14 is rotated in the R direction, a water flow K from the outside toward the center of the void 17 is generated due to the suction action. This makes it possible to easily and surely discharge the waste from the void 17.

Further, as shown in FIG. 5 and FIG. 6 (a view seen from the arrow C in FIG. 5), a plurality of notches 3 are provided on the surface 14a of the knife holder 14 on the side opposite to the space 17, at equal circumferential positions. It is also possible that the notch 3 serves as a blade groove that faces in the counter-rotational direction from the outside toward the center. The notch 3 opens toward the outer periphery and widens in the rotational direction R from the inside to the outside of the surface 14a of the knife holder 14 on the side opposite to the cavity 17, and further extends from the notch 3 to the knife holder. A through hole 4 that obliquely penetrates the knife holder 14 and the knife holder plate 16 in the direction of the rotation axis of the knife holder 14 is opened to the gap 17 side. Also in this case, when the knife holder 14 is rotated in the R direction, a water flow L from the outside to the inside is generated by the suction action, and this water flow L is introduced into the center of the space 17 through the through hole 4 to thereby form the space 17. The scraps can be easily and surely discharged.

As shown in FIGS. 7 and 8 (cross-sectional view taken along the line D-D in FIG. 7), the knife holder 14 and the knife holder plate 16 are provided with a central hole 5 communicating with the space 17, and the center hole 5 is formed. It is also possible that the plurality of inclined holes 6 opened to the outer peripheral side of the knife holder 14 form a blade groove extending in the counter-rotational direction from the outside toward the center. The inclined hole 6 is a through hole that penetrates the knife holder 14 from the center hole 5 to the outer peripheral side of the knife holder 14 obliquely in the rotation direction R. Also in this case, when the knife holder 14 is rotated in the R direction. A water flow M from the outside toward the central hole 5 is generated by the suction action, and by introducing this water flow M into the central portion of the void 17 through the central hole 5, the waste can be easily and surely discharged from the void 17. In addition, in the waste discharge by the center hole and the inclined hole, as shown in FIG. 9, the center hole 7 and the inclined hole 8 are provided in the drive shaft 15 instead of the knife holder, and as shown in FIG. It is also possible to form the inclined hole as the vertical hole 9 having the notch 9a directed in the rotation direction R, and in these cases, the same effect as that of the above-described embodiment can be obtained.

[0015]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. The protrusions, notches, or inclined holes form a blade groove that runs counterclockwise from the outside of the knife holder or drive shaft toward the center, so that a strong water flow that is automatically generated by the suction action due to the rotation of the knife holder is generated. Since the particles are directed toward the center of the void, wastes such as whiskers of the polymer material generated by the granulation work that tries to collect in the void can be easily and reliably discharged from the void.

[Brief description of drawings]

FIG. 1 is a view showing protrusions of an underwater cutting granulator of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view showing a notch of the underwater cutting granulator of the present invention.

FIG. 4 is a view on arrow B of FIG.

FIG. 5 is a view showing another notch of the underwater cutting and granulating apparatus of the present invention.

6 is a view on arrow C of FIG.

FIG. 7 is a sectional view of a center hole and an inclined hole of the underwater cutting granulator of the present invention.

8 is a cross-sectional view taken along line DD of FIG.

FIG. 9 is a cross-sectional view of another center hole and inclined hole of the underwater cutting granulator of the present invention.

FIG. 10 is a sectional view of another inclined hole of the underwater cutting granulator of the present invention.

FIG. 11 is a cross-sectional view of a conventional underwater cutting granulator.

FIG. 12 is a diagram showing a through hole of a conventional underwater cutting granulator.

13 is a sectional view taken along line EE in FIG.

14 is a cross-sectional view taken along the line FF of FIG.

FIG. 15 is a cross-sectional view of another conventional underwater cutting granulator.

[Explanation of symbols]

 1 Protrusion 2, 3 Notch 5 Center Hole 6 Inclined Hole 11 Die 12 Water Chamber 13 Knife 14 Knife Holder 16 Knife Holder Plate 17 Void

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Osamu Ikeda 4-1-1 Hinode-cho, Nada-ku, Kobe-shi, Hyogo Prefecture Iwaya Plant, Kobe Steel, Ltd. (72) Shinji Kurose Hinode, Nada-ku, Kobe-shi, Hyogo Prefecture 4-1-1, Machi Iwaya Plant, Kobe Steel, Ltd.

Claims (4)

[Scope of utility model registration request] 1. A die having an annular surface in which a large number of nozzle holes are opened, and a rotating knife holder having a plurality of knives traveling on the annular surface are arranged to face each other in a water chamber filled with a water stream. In the underwater cutting granulation device in which a void is formed between the die and the knife holder, the underwater cutting granulation is characterized in that the knife holder surface facing the void is provided with a plurality of projections curved toward the rotation direction. apparatus. 2. Instead of the plurality of protrusions according to claim 1, the knife holder is opened toward the outer periphery of the knife holder, and is rotated from the inside of the knife holder surface facing the gap toward the outside of the knife holder surface opposite to the gap. An underwater cutting and granulating device, which is provided with a plurality of cutouts that widen in the direction. 3. In place of the plurality of protrusions according to claim 1, a plurality of notches that are open toward the outer periphery and that widen in the rotational direction are provided on the knife holder surface opposite to the gap.
An underwater cutting and granulating apparatus, characterized in that an oblique through hole extending from the notch toward the rotation axis direction of the knife holder is opened to the void side. 4. A water-filled water die comprising a die having an annular surface with a large number of nozzle holes opened and a rotating knife holder having a plurality of knives held by a drive shaft and traveling on the annular surface. In the underwater cutting granulator which is arranged facing each other in the room and in which a gap is formed between the die and the knife holder, a center hole communicating with the gap is provided in the knife holder or the drive shaft, and from this center hole in the rotation direction of the knife holder. An underwater cutting and granulating apparatus, wherein a plurality of inclined holes facing the knife holder or the drive shaft are opened on the outer peripheral side.