JP5186418B2 - Resin granulator - Google Patents

Description

  The present invention relates to a resin granulator provided in a kneader or an extruder.

For example, as shown in Patent Document 1, in a resin granulating apparatus for producing resin pellets, granulation is performed by cutting a molten resin extruded from a die into water while a cutter (cutter knife) rotates. Is done. The cutter is attached to a plate-shaped knife holder, and the knife holder is fixed to the end of the cutter shaft. The end of the cutter shaft opposite to the knife holder is connected to a drive motor via a coupling, and the middle side of the cutter shaft is rotatably supported by a housing via a bearing.
Therefore, when the cutter shaft is rotated by the drive motor, the cutter shaft rotates with respect to the housing, and the knife holder fixed to the end of the cutter shaft and the cutter attached to the knife holder rotate around the axis of the cutter shaft. Will rotate.

Japanese Patent Laid-Open No. 5-147025

By the way, the bearing may have a clearance in a direction perpendicular to the axis of the cutter shaft. In other words, the cutter shaft may be attached to the housing in such a way that it is allowed to slightly swing in the direction perpendicular to the housing due to poor adjustment during mounting of the bearing, accidental misalignment during operation, and other effects of heat. obtain.
In addition to the bearing clearance, the same can occur due to the elastic deformation of the bearing and the elastic deformation of the cutter shaft.
Therefore, during cutting, if a force is applied to the cutter shaft in a direction that causes the cutter shaft to swing above the axis for some reason, the die end of the cutter shaft, which is the free end, is swung upward, The knife holder attached perpendicularly to the shaft will be inclined with respect to the die surface. Then, the cutter attached to the lower side of the knife holder is strongly pressed against the die surface, whereas the cutter attached to the upper side is pressed against the die surface weakly.

Normally, a frictional force acts between the die surface and the cutter rotating with respect to the die surface. However, if the cutter arrangement is rotationally symmetric, the frictional force acting on multiple cutters is balanced as a whole. It is kept. However, it is assumed that the frictional force generated between the cutter and the die surface is unbalanced between the upper side and the lower side of the die, and the cutter shaft is bent in the right direction.
Then, the cutter knife attached to the left side of the knife holder is pressed strongly against the die side, and the cutter knife attached to the right side is pressed weakly. The frictional force generated between the cutter and the die surface is unbalanced between the left side and the right side of the knife holder, and the cutter shaft bends downward along the rotational direction. This time, the frictional force is unbalanced between the upper side and the lower side of the knife holder, and the cutter shaft bends to the left along the rotational direction. In this way, the frictional force continues to act on the cutter shaft in a direction perpendicular to the swinging direction, so that a swinging motion such as “grinding” occurs on the cutter shaft.

In other words, the bending vibration and the frictional force continuously act in the vertical direction and the horizontal direction on the cutter shaft, resulting in the above-described whirling motion (unstable vibration). This whirling motion is likely to increase self-excited because the frictional force unbalance increases as the cutter shaft is bent, and there is a risk of causing abnormal vibration that makes it impossible to stably manufacture the pellet.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a resin granulator capable of stably producing pellets without causing abnormal vibration of the cutter shaft.

In order to achieve the object, the present invention takes the following technical means.
That is, the resin granulating apparatus of the present invention includes a cutter that cuts a molten resin material extruded from a die, a cutter shaft that includes the cutter on a distal end side, and a bearing housing that rotatably supports the cutter shaft. A resin granulator comprising a drive housing that supports the bearing housing so as to be movable in the axial direction,
The bearing housing and / or the drive housing are formed in irregular cross-sectional shapes that are different from each other in two directions perpendicular to each other in the direction perpendicular to the axis.

  In the bearing housing and / or the drive housing formed in such an irregular cross-sectional shape, the support rigidity (bending rigidity) when supporting the cutter shaft when the cutter shaft is deformed in the vertical direction or when deformed in the horizontal direction. Therefore, the force that presses the cutter toward the die surface and the force applied to the cutter shaft (friction force) are different depending on whether the cutter shaft bends in the vertical direction or in the horizontal direction. become. As a result, even if the cutter shaft is shaken in the direction perpendicular to the axis, the shake does not increase self-excited, and the cutter shaft does not cause abnormal vibration. Therefore, the pellet can be manufactured stably.

In addition, the bearing housing and / or the drive housing is preferably formed in an irregular cross-sectional shape that is rotationally symmetric about the axis of the cutter shaft.
In order to form the bearing housing and the drive housing in an irregular cross-sectional shape, for example, a plurality of gaps are formed in the drive housing in the circumferential direction, and the plurality of gaps are formed in the direction perpendicular to the axis of the drive housing. It can arrange | position so that rigidity may mutually differ in two directions orthogonal.
Also, the bearing housing is provided in the drive housing at a distance from the inner peripheral surface of the drive housing, and the bearing housing has different cross-sections that are different from each other in two directions perpendicular to the axis perpendicular rigidity. A plurality of rib portions supporting the bearing housing with respect to the drive housing may be disposed between the drive housing and the bearing housing, and the plurality of rib portions may be perpendicular to the axis of the drive housing. You may arrange | position so that the rigidity of a direction may mutually differ in two directions orthogonal.

  With the resin granulating apparatus of the present invention, pellets can be stably manufactured without causing abnormal vibration of the cutter shaft.

It is front sectional drawing of the resin granulation apparatus of 1st Embodiment. (A) is an expanded sectional view of a cutter knife, (b) is a figure for demonstrating the unstable vibration of a cutter shaft. It is a figure which shows arrangement | positioning of the cutter knife in the conventional resin granulation apparatus. It is sectional drawing of the bearing housing and drive housing in the resin granulation apparatus of this invention. It is sectional drawing of the bearing housing and drive housing at the time of providing a rib part. It is sectional drawing of the bearing housing and drive housing at the time of providing a space | gap.

Hereinafter, the resin granulation apparatus 1 of this invention is demonstrated based on drawing.
The resin granulating apparatus 1 of the present invention is provided on the downstream side of an extruder or continuous kneader, and granulates resin pellets from a resin material M kneaded and melted by the extruder or continuous kneader. It is. In the present embodiment, the resin granulating apparatus 1 of the present invention will be described by taking a resin granulating apparatus provided on the downstream side of the extruder as an example.
As shown in the schematic diagram of FIG. 1, the resin granulating apparatus 1 includes a cooling chamber 4 (also referred to as a water chamber) that distributes warm water (cooling water) from a lower supply port 2 toward an upper discharge port 3. Is provided inside the tip side. In the cooling chamber 4, there are a die 5 for extruding a molten resin material M and a cutter knife 6 for cutting the material M extruded from the die 5. The cutter knife 6 is attached to the end of the elongated cutter shaft 7 on the distal end side via a knife holder 8, and a bearing housing 9 and the bearing housing 9 are attached to the proximal end side of the cutter shaft 7. And a pressing means 11 that presses the bearing housing 9 toward the upstream side (the die 5 side).

In the following description, the direction parallel to the axis of the cutter shaft 7 on the paper surface of FIG. 1 is the axis direction when the resin granulating apparatus 1 is described. Moreover, let the left side of the paper surface of FIG. 1 be the upstream side or the distal end side when describing the resin granulator 1 and the cutter shaft 7, and let the right side of the paper surface be the downstream side or the proximal end side. Furthermore, the direction away from the axial center of the cutter shaft 7 along the radial direction is defined as the radially outer side or the radially outer direction when the resin granulating apparatus 1 is described, and the direction approaching the axial center of the cutter shaft 7 from the radially outer side. It is called the inner diameter or inner diameter direction.
Hereinafter, the resin granulator 1 will be described in detail.

The resin granulating apparatus 1 is provided with a cooling chamber housing 12 on the distal end side, and the inside of the cooling chamber housing 12 is a cavity and serves as a cooling chamber 4. In the cooling chamber 4, a die 5 for extruding the resin material M so as to come into contact with the upstream wall surface of the cooling chamber housing 12 is provided.
The die 5 is formed in a disc shape around the axis of the cutter shaft 7. A part of the surface facing the downstream side of the die 5 is formed to project in a bank shape toward the downstream side. A die surface 5a is formed at the projecting end of the portion projecting and formed in the bank shape.

A plurality of resin extrusion holes 13 are formed in the die 5 so as to penetrate the inside of the die 5. The opening on the upstream side of the resin extrusion hole 13 communicates with the inside of the extruder so that the molten resin can be supplied from the extruder to the die 5 side. The downstream side of the resin extrusion hole 13 is open to the die surface 5a, and the material M can be pushed out into the water from the downstream side opening. The die surface 5a is formed flat so as to face a direction perpendicular to the axial direction, and a cutting edge of a cutter knife 6 to be described later can come into contact with no gap.
A plurality of cutter knives 6 rotating in contact with the die 5 are attached to the knife holder 8. The knife holder 8 is attached to the end portion on the distal end side of the cutter shaft 7 and is formed in a disc shape concentric with the cutter shaft 7. A plurality (16 in the present embodiment) of cutter knives 6 are provided on the surface of the knife holder 8 facing the front end side at equal distances in the circumferential direction. All of these cutter knives 6 are attached with their cutting edges oriented in a direction perpendicular to the axial direction, so that the cutting edges can contact the die surface 5a without any gaps. Therefore, when the cutter shaft 7 rotates around the axis, the cutter knife 6 rotates integrally with the cutter shaft 7 and the material M pushed out into water is cut. And the cut | disconnected material M rides on the flow of warm water, is conveyed, and is collect | recovered as a pellet.

The cutter shaft 7 is a long member disposed along the axial direction, and the tip of the cutter shaft 7 extends into the cooling chamber 4. The base end side of the cutter shaft 7 from the cooling chamber 4 (the middle of the cutter shaft 7) is rotatably supported by a bearing housing 9 provided inside the resin granulating apparatus 1. The proximal end side of the cutter shaft 7 is connected to a motor.
The bearing housing 9 is a member formed in a cylindrical shape around the axis, and is disposed adjacent to the downstream side of the cooling chamber housing 12. A cutter shaft 7 is disposed inside the bearing housing 9 so as to penetrate along the axial direction, and a plurality of (in the present embodiment, spaced apart in the axial direction) are provided on the inner peripheral side of the bearing housing 9. Two bearings 14 (bearings) are provided. The bearing 14 supports the cutter shaft 7 so as to be rotatable with respect to the bearing housing 9 and to restrict movement in the axial direction.

Similar to the bearing housing 9, the drive housing 10 is disposed adjacent to the downstream side of the cooling chamber housing 12. The drive housing 10 is formed in a cylindrical shape that opens toward the downstream side, and a bearing housing 9 is accommodated therein so as to be slidable in the axial direction. A through hole 15 is formed on the upstream side of the drive housing 10 so as to penetrate the inside of the drive housing 10 along the axial direction. The cutter shaft 7 is inserted into the through hole 15 so as to be movable in the axial direction. . A shaft seal 16 is provided on the inner peripheral surface of the through-hole 15 so as to be in contact with the outer peripheral surface of the cutter shaft 7 and to keep the cooling chamber 4 side watertight. The shaft seal 16 maintains watertightness with respect to the cooling chamber 4. However, the cutter shaft 7 can be moved and rotated in the axial direction.

By the way, even if the cutter shaft 7 and the bearing 14 are designed with high accuracy, the bearing 14 may be affected by poor adjustment at the time of mounting the bearing, unintentional misalignment even when appropriate adjustment is performed at the beginning, or the influence of heat. In some cases, a clearance is generated between the inner and outer rings and the rolling elements by a bearing clearance. Since this clearance occurs outside the diameter of the cutter shaft 7, the cutter shaft 7 is allowed to swing a little in the direction perpendicular to the drive housing 10 due to this clearance.
In addition to the clearance of the bearing 14, the same thing can occur due to the elastic deformation of the bearing 14 and the elastic deformation of the cutter shaft 7.

As shown in FIG. 2A, the adjustment of the perpendicularity between the die surface 5a and the cutter shaft 7 is not sufficient, or the cutter shaft 7 has a deflection angle θ above the axis for some other accidental reason. When shaken, the knife holder 8 attached perpendicularly to the cutter shaft 7 is inclined with respect to the die surface 5a.
Normally, a plurality of cutter knives 6 are attached to the knife holder 8 in the circumferential direction as shown in FIG. 3, and each cutter knife 6 has a substantially equal frictional force between the die surface 5a in the tangential direction. It is working. These cutter knives 6 are arranged in rotational symmetry with respect to the axis of the cutter shaft 7, and the frictional force applied to the cutter knife 6 is maintained by keeping the balance of the frictional force applied to the cutter knife 6 on the surface of the knife holder 8. The shaft 7 is not affected.

  However, when the knife holder 8 attached to the tip of the cutter shaft 7 inclined upward (3 side in FIG. 2B) is pressed against the die surface 5a using the pressing means 11, the lower side of the knife holder 8 (FIG. The cutter knife 6 attached to 1 side of 2 (b) is approaching the die surface 5a due to the inclination of the knife holder 8, and is strongly pressed toward the die surface 5a. On the other hand, the upper cutter knife 6 attached to the opposite side across the axis of the cutter shaft 7 is separated from the die surface 5a due to the inclination of the knife holder 8, so that it is weakly pressed toward the die surface 5a. As a result, the frictional force generated in the lower cutter knife 6 is greater than the frictional force applied to the upper cutter knife 6.

For example, when the knife holder 8 (cutter shaft 7) is rotating in the direction of the arrow in FIG. 2B with respect to the die surface 5a, the frictional force directed to the right acts on the cutter shaft 7 preferentially. Then, the cutter shaft 7 bends in the right direction (direction 4 in FIG. 2B).
Then, the cutter knife 6 attached to the left side of the knife holder 8 is pressed strongly against the die 5 side, and the cutter knife 6 attached to the right side is pressed weakly. Then, the frictional force generated between the cutter knife 6 and the die surface 5a becomes unbalanced between the left side and the right side of the knife holder 8, and the cutter shaft 7 moves downward (1 in FIG. 2B). Turn in the direction of.

Then, this time, the frictional force is unbalanced between the upper side and the lower side of the knife holder 8, and the cutter shaft 7 bends in the left direction (direction 2 in FIG. 2B) along the rotation direction. In this way, the direction in which the cutter shaft 7 bends and the direction in which the frictional force generated between the cutter knife 6 and the die surface 5a acts continuously change in the order of 1 to 4 in the figure. As a result, a whirling motion (unstable vibration) in which the cutter shaft 7 swings like a sawtooth occurs.
This whirling movement tends to increase self-excitingly as the bending of the cutter shaft 7 increases, and the frictional force imbalance increases. This may cause abnormal vibration that makes it impossible to stably manufacture the pellet. is there.

Therefore, in the resin granulating apparatus 1 according to the present invention, the bearing housing 9 and / or the drive housing 10 that supports the cutter shaft 7 is used instead of the actually bent cutter shaft 7 in two directions in which the support rigidity of the cutter shaft 7 is orthogonal. (For example, a structure in which the vertical support rigidity is large and the horizontal support rigidity is small).
In this way, for example, the support rigidity of the bearing housing 9 and / or the drive housing 10 with respect to the cutter shaft 7 is different between the vertical direction and the horizontal direction, and the cutter shaft 7 is unlikely to bend in the vertical direction but in the horizontal direction. Is easy to bend, and the way of bending of the cutter shaft 7 can be made different in the vertical direction and the horizontal direction. As a result, when the cutter knives 6 disposed above and below the cutter shaft 7 contact the die surface 5a, the frictional force acting on the cutter shaft 7 and when the cutter knives 6 disposed on the left and right contact the die surface 5a. The magnitude of the frictional force acting on the sphere also differs. Then, it is possible to avoid a situation where the bending of the cutter shaft 7 and the generation of frictional force are monotonously repeated. As a result, the self-excited amplification of the vibration of the cutter shaft 7 is suppressed, and the abnormal vibration of the cutter shaft 7 Can be reliably prevented.

  However, it is not preferable to form the frame member that supports the rotating body in an irregular shape, even if the cross-sectional shape has different support rigidity in two orthogonal directions (for example, the vertical direction and the horizontal direction). Therefore, in the resin granulating apparatus 1 of the present invention, the support shaft of the cutter shaft 7 has different support rigidity in the vertical direction and the horizontal direction, but has a shape that is rotationally symmetric around the axis (360 / n around the axis). The bearing housing 9 and / or the drive housing 10 are formed in such a shape that the same shape as before rotation appears when rotated by (integer).

Specifically, the irregular cross-sectional shape is such that the bending rigidity along the vertical axis direction differs between when bending along the vertical direction and when bending along the horizontal direction. As such an irregular cross-sectional shape, for example, a cross-section as shown in FIG. 4 can be adopted.
In the example of FIG. 4, the bearing housing 9 is formed in a cylindrical shape having a substantially rectangular outer shape around the axis of the cutter shaft 7. An upper rib portion 17 is formed on the upper surface of the bearing housing 9, and a lower rib portion 18 is formed on the lower surface. The distal ends of the upper and lower rib portions 17 and 18 are formed wider than the base end side, and the wide portions are formed on the upper and lower sides of the bearing housing 9 and the wall 10 a of the drive housing 10. Each is fitted inside.

  The drive housing 10 is disposed at a distance from the bearing housing 9 above and below the bearing housing 9. The drive housing 10 is formed in a rectangular tube shape that is long along the axial direction, and the inside thereof is formed hollow so that the ends of the upper and lower rib portions 17 and 18 that are formed wide can be accommodated. . A slit-like groove 19 communicating with the inside and outside of the drive housing 10 is formed on the side of the drive housing 10 facing the bearing housing 9, and this groove 19 allows passage of the upper and lower rib portions 17, 18 on the base end side. It is formed to the width to be. Therefore, the bearing housing 9 is engaged with the drive housing 10 so as to be movable in the axial direction by fitting the tips of the upper and lower rib portions 17, 18 into the drive housing 10 through the groove 19.

  The resin granulating apparatus 1 illustrated in FIG. 4 has upper and lower rib portions 17 and 18 formed on the upper and lower sides of the drive housing 10, so that it has a rigidity supporting the cutter shaft 7 that bends in the left-right direction The rigidity for supporting the cutter shaft 7 that bends in the vertical direction is stronger. Therefore, the force for pressing the cutter knife 6 toward the die surface 5a and the friction force generated at that time are different between when the cutter shaft 7 is bent along the vertical direction and when it is bent along the horizontal direction. As a result, even if the cutter shaft 7 shakes in the direction perpendicular to the axis, the shake does not increase by itself, and the cutter shaft 7 does not cause abnormal vibration. be able to.

In other words, the resin granulating apparatus 1 illustrated in FIG. 4 is provided with a bearing housing 9 at a distance from the inner peripheral surface of the drive housing 10 inside the drive housing 10, and the drive housing 10 and the bearing housing are provided. 9, a plurality of rib portions (upper and lower rib portions 17 and 18 in the example of FIG. 4) supporting the bearing housing 9 with respect to the drive housing 10 are arranged, and the plurality of rib portions are perpendicular to the axis of the drive housing 10. It can also be said that they are arranged so as to be different from each other in two directions (in this case, the vertical direction and the horizontal direction) in which the rigidity of the directions is orthogonal.

In the example of FIG. 4, the rectangular cylindrical drive housing 10 is provided above and below the bearing housing 9. However, the normal drive housing 10 is formed in a cylindrical shape in accordance with the cutter shaft 7. There are many cases. Therefore, when the drive housing 10 can be formed in a cylindrical shape, a structure as shown in FIGS. 5A to 5C can be employed.
In the resin granulating apparatus 1 illustrated in FIG. 5A, the drive housing 10 is formed in a cylindrical shape instead of a rectangular tube shape, and the bearing housing 9 is placed in a wall 10a formed in the cylindrical shape. The tips of the upper and lower rib portions 17 and 18 are fitted. And this bearing housing 9 is formed in the rectangular-shaped cross section with the thickness of an up-down direction large compared with the thickness of the left-right direction. If the bearing housing 9 is formed in a rectangular cross section having a different vertical and horizontal size as described above, the cutter shaft that bends in the vertical direction as compared with the rigidity for supporting the cutter shaft 7 that bends in the left-right direction. The rigidity supporting 7 can be strengthened.

In addition, when a rib portion is provided between the bearing housing 9 and the drive housing 10 that are arranged at a distance from each other, the rigidity for supporting the cutter shaft 7 only by the rib portion is provided regardless of the outer shape of the bearing housing 9. Since it can be changed between the vertical direction and the horizontal direction, for example, the bearing housing 9 has a circular cross section as illustrated in FIG. 5B, or a chamfered rectangle as illustrated in FIG. 5C. It can also be a cross section of a shape (substantially octagonal shape).
On the other hand, when it is not preferable to provide a distance between the bearing housing 9 and the drive housing 10 or when a sufficient distance cannot be secured, the interior of the drive housing is hollowed out to provide a plurality of circumferential directions. It is also possible to form the gap 20 and arrange the plurality of gaps 20 so that the rigidity in the direction perpendicular to the axis of the drive housing is different from each other in two directions orthogonal to each other.

A resin granulating apparatus 1 illustrated in FIG. 6A accommodates a bearing housing 9 that is also formed in a cylindrical shape inside a drive housing 10 that is formed in a cylindrical shape, and an outer peripheral surface of the bearing housing 9. And the inner peripheral surface of the drive housing 10 are in contact with each other in a surface state.
The interior of the drive housing 10 is cut out along the axial direction. This hollowed portion is formed by hollowing the two portions symmetrical to each other across the shaft center (left and right sides of the shaft center in the example) over the same circumferential length, and the diameter of the hollowed portion. A gap 20 is formed between the outer wall 21 provided on the outer side and the inner wall 22 provided on the inner diameter side. On the other hand, the wall 10a of the drive housing 10 disposed above and below the shaft center is solid, and the support rigidity of the cutter shaft 7 is lower than that of the upper and lower walls 10a provided with the gap 20. Yes. That is, the drive housing 10 has a higher rigidity for supporting the cutter shaft 7 bent along the vertical direction than the rigidity for supporting the cutter shaft 7 bent along the left-right direction. Therefore, the force for pressing the cutter knife 6 toward the die surface 5a and the friction force generated at that time are different between when the cutter shaft 7 is bent along the vertical direction and when it is bent along the horizontal direction. As a result, even if the cutter shaft 7 shakes in the direction perpendicular to the axis, the shake does not increase by itself, and the cutter shaft 7 does not cause abnormal vibration. be able to.

In other words, the resin granulating apparatus 1 illustrated in FIG. 6A is formed by hollowing out the inside of the drive housing 10 around the axis of the cutter shaft 7 in the circumferential direction, and forming the inner wall 22 and the outer wall 21 formed by hollowing out. It is also possible to say that the support rigidity of the cutter shaft 7 is changed between the vertical direction and the horizontal direction by connecting ribs with ribs provided respectively above and below the shaft center.
When the interior of the drive housing 10 is cut out as described above, as shown in FIG. 6 (b), the upper left, the upper right, the lower left, and the lower right are spread over four positions with the axis of the cutter shaft 7 as a reference. It is also possible to form four voids 20 in the circumferential direction by punching out. Of the solid parts in the upper, lower, left, and right formed between the gaps 20 adjacent in the circumferential direction, the thickness of the upper and lower solid parts is thicker than the thickness of the left and right solid parts. In such a drive housing 10, the thickness of the upper and lower solid portions is thicker than the thickness of the left and right solid portions, and the support rigidity is also increased. Therefore, the rigidity for supporting the cutter shaft 7 that is bent along the vertical direction is stronger than the rigidity for supporting the cutter shaft 7 that is bent along the left-right direction, and the resin structure illustrated in FIG. It is possible to exert the same effect as the grain device 1.

The present invention is not limited to the above-described embodiments, and the shape, structure, material, combination, and the like of each member can be appropriately changed without changing the essence of the invention.
For example, in the above-described embodiment, the bearing housing 9 and / or the drive housing 10 are illustrated as having different cross-sectional shapes in which the vertical and horizontal support rigidity are different from each other. The two directions are not limited to the vertical direction and the horizontal direction as long as they are orthogonal to each other. For example, the bearing housing 9 and / or the drive housing 10 may be formed in a modified cross-sectional shape in which the support rigidity in the direction inclined by 45 ° and the support rigidity in the direction inclined by −45 ° are different from each other. good.

In the above-described embodiment, the drive housing 10 is illustrated as having a cylindrical outer shape. However, by forming the drive housing 10 into a rectangular outer shape, the support rigidity of the drive housing 10 with respect to the cutter shaft 7 is defined as the vertical direction. It can also be changed in the horizontal direction.
In the above embodiment, an example in which a plurality of rib portions are formed on the outer peripheral surface of the bearing housing 9 is illustrated. However, for example, a plurality of rib portions are formed on the inner peripheral surface and the outer peripheral surface of the drive housing 10 to The support rigidity of the drive housing 10 can be changed between the vertical direction and the horizontal direction.

  For example, in the above embodiment, the inside of the drive housing 10 is cut out to provide the gap 20, but if the gap 20 can be provided inside the drive housing 10, the formation method of the gap 20 is not hollow. Alternatively, the inside of the bearing housing 9 can be cut out in place of the drive housing 10.

DESCRIPTION OF SYMBOLS 1 Resin granulator 2 Supply port 3 Discharge port 4 Cooling chamber 5 Dice 5a Die surface 6 Cutter knife 7 Cutter shaft 8 Knife holder 9 Bearing housing 10 Drive housing 10a Wall 11 Pressing means 12 Cooling chamber housing 13 Resin extrusion hole 14 Bearing 15 Through-hole 16 Shaft seal 17 Upper rib portion 18 Lower rib portion 19 Groove 20 Air gap 21 Outer wall 22 Inner wall

Claims (5)

A cutter that cuts the material of the molten resin extruded from the die, a cutter shaft that has the cutter on the tip side, a bearing housing that rotatably supports the cutter shaft, and the bearing housing that is movable in the axial direction A resin granulating apparatus comprising a drive housing supported by
The resin granulating apparatus, wherein the bearing housing and / or the drive housing are formed in different cross-sectional shapes that differ from each other in two directions perpendicular to the axis perpendicular direction.   The resin granulating apparatus according to claim 1, wherein the bearing housing and / or the drive housing is formed in a modified cross-sectional shape that is rotationally symmetric about an axis of the cutter shaft. A plurality of gaps are formed in the drive housing over the circumferential direction,
3. The resin granulating apparatus according to claim 1, wherein the plurality of gaps are arranged so that the rigidity in the direction perpendicular to the axis of the drive housing is different in two directions orthogonal to each other. Inside the drive housing, the bearing housing is provided at a distance from the inner peripheral surface of the drive housing,
The resin granulating apparatus according to any one of claims 1 to 3, wherein the bearing housing is formed in an irregular cross-sectional shape such that the rigidity in the direction perpendicular to the axis is different in two directions orthogonal to each other. Inside the drive housing, the bearing housing is provided at a distance from the inner peripheral surface of the drive housing,
Between the drive housing and the bearing housing, a plurality of rib portions for supporting the bearing housing with respect to the drive housing are arranged,
5. The resin granulating apparatus according to claim 1, wherein the plurality of rib portions are arranged so that rigidity in a direction perpendicular to an axis of the drive housing is different from each other in two directions orthogonal to each other. .

Images