JP4109152B2 - Pelletizer equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pelletizer device attached to an extruder, and more particularly to a pelletizer device including a cutter head that makes the contact force of a cutter blade to a die face uniform at all times.
[0002]
[Prior art]
Conventionally, the resin melted in the extruder is continuously extruded in a thread form from a large number of die holes in the die face of the die in the extruder, so that the pelletizer is one means for processing the extruded molten resin into particles. There is a device. There are various types of pelletizer devices. One of these pelletizer devices is a plurality of pelletizer devices that are moved forward and backward in a direction perpendicular to the die face and are rotatably supported on the device body. A cutter blade is attached, and the plurality of cutter blades are directly applied to the die face and the rotation shaft is rotated, so that the molten resin extruded from the die face is cut at a short interval by the plurality of cutter blades, and is granulated. Molded.
[0003]
More specifically, the plurality of cutter blades are arranged radially on a cutter head fixed to a rotation shaft, and when the rotation shaft is rotated, the cutter blades rotate like a fan. On the other hand, in many cases, a large number of die holes for extruding molten resin are arranged in a circular shape around the same position as the rotation center of the cutter blade (see, for example, Patent Document 1).
[0004]
The above cutter blades need to be rotated while in contact with the die face. However, if the rotation surface of the cutter blade and the die face are not parallel, the cutter blade will be die faced in some of the die holes. The part which does not touch will come out.
[0005]
If the cutter blade does not come into contact with the die face, the molten resin will not be cut well and defective molding will occur, so the die face and the cutter blade must be parallel before operating the pelletizer device. Must be checked and adjusted.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2003-39427
[Problems to be solved by the invention]
By the way, in the above-described conventional pelletizer device, the cutter head that holds the cutter blade is fixed to the rotating shaft. Therefore, in order to make the die face and the cutter blade parallel, the space between the cutter cover and the rotating shaft holder. The angle of the rotating shaft had to be adjusted to the die face by some method such as inserting a push-pull bolt on the die face. For this reason, the confirmation and adjustment of the parallelism between the die face and the cutter blade is a delicate operation and takes time.
[0008]
In addition, the above confirmation / adjustment work can be performed only before the pelletizer device is operated. However, before and during the operation, the temperature change of the parts around the die face and the cutter blade, or the inside of the extruder head There is a problem that the parallelism of the die face and the cutter blade may be distorted by the pressure of.
[0009]
Furthermore, even if the parallelism between the die face and the cutter blade is adjusted once, the pelletizer device and the extruder must be separated during maintenance, so that the parallel confirmation will be repeated while repeating this separation and installation.・ There was a problem that adjustment might be necessary.
[0010]
As described above, conventionally, there is a problem that the delicate adjustment of the parallelism of the die face and the cutter blade must be repeated at a high frequency, and the adjustment is distorted due to each disturbance during operation. It was.
[0011]
The present invention has been made to solve the above-described problems, and its purpose is to rotate the cutter blade evenly in contact with the die face without fine adjustment of the parallelism between the die face and the cutter blade. It is an object of the present invention to provide a pelletizer device that can be used.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a pelletizer device according to a first aspect of the present invention includes a rotary shaft that is movable back and forth in a direction orthogonal to a die face through which molten resin is extruded, and a gap at the tip of the rotary shaft. And a plurality of cutter blades provided radially at an appropriate interval on the cutter head, the plurality of cutter blades when the plurality of cutter blades are pressed against a die face. the cutter blade so as to maintain the parallelism against constantly the die face evenly contacts the die face, the cutter head is provided to protrude to the rotation axis of the front end surface of the rotation axis of said rotary shaft approximately equal intervals in a circular shape around the rotation axis to the front end surface of the rotary shaft while being supported so as to be inclined relative orthogonal direction of the rotation axis by the engagement portion, the mosquito And is characterized in that it is pressed and held by the urging force of the distributed multiple biasing means between data edge into the fitting portion.
[0015]
Therefore, when a biased force is applied to the cutter blade, the cutter head tilts flexibly against the urging force of the urging means with the center of the fitting portion of the rotating shaft as a fulcrum, and the cutter blade is against the die face. Therefore, it is always pressed evenly by the biasing force of the biasing means. Without fine adjustment of the parallelism of the die face and cutter blade, the tilt of the cutter head is corrected so that the cutter blade contacts the die face evenly, and the cutter blade and the die face can be easily touched without gaps. Become.
[0016]
The pelletizer device according to a second aspect of the present invention is the pelletizer device according to the first aspect , wherein the fitting portion is formed of a convex spherical body or a concave spherical surface portion.
[0017]
Therefore, since the fitting part is formed of a convex spherical body or a concave spherical part, the cutter blade is always pressed evenly against the die face.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
The pelletizer device according to this embodiment is attached to an extruder, and when the resin melted in the extruder is continuously extruded in a thread form from a large number of die holes of the die, this molten resin is extruded. Is cut into granules with a plurality of cutter blades provided at the tip of the cutter head and processed into pellets.
[0020]
Referring to FIGS. 1 and 2, as shown by a two-dot chain line in FIG. 1, the die 1 of the extruder is provided with a large number of die holes 5 communicating with the die face 3. The melted resin kneaded in (1) is configured to communicate with the numerous die holes 5 of the die 1. The numerous die holes 5 described above are arranged in a circular shape centered at substantially the same position as the rotation center of the cutter blade mounted on the pelletizer device 7.
[0021]
The pelletizer device 7 includes a rotation shaft 9, which is located on the left side of the die 1 in FIG. 1 and is orthogonal to the die face 3 of the die 1 (left and right direction in FIG. 1). It is provided so that it can move forward and backward. The rotary shaft 9 is rotatably provided by a rotary drive mechanism such as a motor (not shown) and the rotary shaft 9 moves in the left-right direction in FIG. 1, for example, a forward / backward drive mechanism such as a motor, a ball screw, or a nut member (not shown). Is provided so that the forward / backward movement can be adjusted.
[0022]
A plurality of cutter blades 13 are attached to the distal end of the rotary shaft 9 via a cutter head 11, and the rotary shaft 9 is moved and adjusted in the horizontal direction in FIG. The forward / backward movement is adjusted toward 3. Therefore, when the plurality of cutter blades 13 are directly applied to the die face 3 and the rotary shaft 9 is rotated, the molten resin pushed out of the die face 3 is cut at short intervals by the plurality of cutter blades 13. To be formed into a granular shape.
[0023]
In this embodiment, the cutter head 11 has a disk shape, and is provided at the front end (right end in FIG. 1) of the rotating shaft 9 so as to be flexible and tiltable about the rotating axis CL of the rotating shaft 9. . Further, a plurality of cutter blades 13 are radially attached to the cutter head 11, and in this embodiment, four cutter blades 13 are attached by, for example, bolts BT.
[0024]
More specifically, the cutter head 11 includes, for example, a convex spherical body 15 as a fitting portion provided so as to protrude from the rotational axis CL of the tip surface of the rotary shaft 9, and a cutter to be fitted to the convex spherical body 15. Since the concave spherical portion 17 provided on the rear end surface of the head 11 is fitted and supported, and a gap G is provided between the rear end surface of the cutter head 11 and the front end surface of the rotary shaft 9. The cutter head 11 is configured to be freely tiltable with respect to a direction orthogonal to the rotation axis CL of the rotation shaft 9.
[0025]
In addition, a plurality of spring support shafts 19 are provided on the front end surface of the rotation shaft 9 so as to be arranged in a circle around the rotation axis CL at substantially equal intervals. In this embodiment, as shown in FIG. 2, four hexagon socket bolt-shaped spring support shafts 19 are screwed into screw holes 21 provided on the front end surface of the rotary shaft 9. Further, the cutter head 11 is provided with spring holes 23 for accommodating the spring support shafts 19. The cutter head 11 is interposed between the head portions 25 of the spring support shafts 19 and the spring holes 23. By being urged so as to be pressed against the convex spherical body 15 of the rotating shaft 9 by the urging force of, for example, a spring 27 as a wound urging means, it is integrally held at the tip of the rotating shaft 9.
[0026]
As the urging means, the coiled spring 27 is used in this embodiment, but it may be a spring of another form or an elastic member such as urethane resin. .
[0027]
With the above-described configuration, the rotary shaft 9 moves forward in the right direction in FIG. 1, and the cutter blade 13 moves forward and contacts the die face 3 along with this.
[0028]
At this time, before the cutter blade 13 contacts the die face 3, even if the parallelism of the cutter blade 13 with respect to the die face 3 is out of order, the cutter head 11 is flexible around the rotational axis CL of the rotary shaft 9. Since tilting is possible, the tilt of the cutter head 11 is corrected by pressing the cutter blade 13 against the die face 3, and a state in which the cutter blade 13 contacts the die face 3 without a gap can be easily obtained.
[0029]
In other words, when the cutter blade 13 is pressed against the die face 3, the cutter head 11 easily tilts against the urging force of the spring 27 with the rotation axis CL of the convex spherical body 15 provided on the rotation shaft 9 as a fulcrum. In other words, the cutter blade 13 is always pressed evenly against the die face 3 by the urging force of the spring 27.
[0030]
Therefore, the cutter blades 13 rotate because the plurality of cutter blades 13 always rotate evenly in contact with the die face 3 without performing subtle confirmation and adjustment of the parallelism between the die face 3 and the cutter blade 13. Since the cutting of the molten resin due to this improves, a high-quality molded product is produced.
[0031]
In addition, there is a change in the temperature of parts around the die face 3 and the cutter blade 13 before and during the operation of the pelletizer device, or a change in the parallelism of the die face 3 and the cutter blade 13 due to the pressure in the extruder head. However, for the above reasons, the plurality of cutter blades 13 rotate while always contacting the die face 3 evenly.
[0032]
Furthermore, even if the pelletizer device and the extruder are separated during the maintenance and are repeatedly mounted again, confirmation / adjustment of the parallelism between the die face 3 and the cutter blade 13 is unnecessary for the above reasons. The conventional complexity is eliminated.
[0033]
Next, a pelletizer device 29 according to another embodiment of the present invention will be described with reference to the drawings. In addition, the same member as the pelletizer apparatus 7 of embodiment mentioned above attaches | subjects the same code | symbol, demonstrates only a different part, and abbreviate | omits description of the same part.
[0034]
Referring to FIG. 3, as the fitting portion in the pelletizer device 7 of the above-described embodiment, a convex spherical body 15 is provided so as to protrude from the rotational axis CL of the distal end surface of the rotary shaft 9, and the convex spherical body 15 A concave spherical surface portion 17 is provided on the rear end surface of the cutter head 11 as a fitting portion of the rotary shaft 9 of this embodiment. A spherical portion 31 is provided, and a convex spherical body 33 that fits into the concave spherical portion 31 is provided on the rear end surface of the cutter head 11.
[0035]
The fitting portion is not limited to the convex spherical bodies 15 and 33 and the concave spherical portions 17 and 31, but may be a combination of a fitting convex portion and a fitting concave portion in another form. I do not care.
[0036]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change.
[0038]
【The invention's effect】
As can be understood from the description of the embodiment of the invention as described above, according to the invention of claim 1 , when a biased force is applied to the cutter blade, the cutter head uses the center of the fitting portion of the rotating shaft as a fulcrum. Since it tilts flexibly against the urging force of the urging means, the cutter blade can be always pressed evenly against the die face by the urging force of the urging means. Without fine adjustment of the parallelism of the die face and cutter blade, the tilt of the cutter head can be corrected so that the cutter blade contacts the die face evenly, and the cutter blade and die face can be easily touched without gaps. Obtainable.
[0039]
According to the invention of claim 2 , since the fitting portion is formed of a convex spherical body or a concave spherical surface portion, the cutter blade can be constantly pressed against the die face.
[Brief description of the drawings]
1 is a schematic cross-sectional view of a pelletizer device according to an embodiment of the present invention, and is a cross-sectional view taken along the line II in FIG.
FIG. 2 is a right side view of FIG.
3 is a schematic cross-sectional view of a pelletizer device according to another embodiment of the present invention, and is a cross-sectional view corresponding to the line II in FIG.
[Explanation of symbols]
1 die (extruder)
3 Die face 5 Die hole 7 Pelletizer device 9 Rotating shaft 11 Cutter head 13 Cutter blade 15 Convex spherical body (fitting part)
17 Concave spherical surface (fitting part)
19 Spring support shaft 23 Spring hole 25 Head part (of the spring support shaft 19)
27 Spring (biasing means)
29 Cutter head device (of other embodiments)
31 Concave spherical surface (fitting part)
33 Convex spherical body (fitting part)
CL Rotation axis G Gap

Claims (2)

A rotating shaft that can be moved back and forth in a direction orthogonal to the die face through which the molten resin is extruded, a cutter head provided at the tip of the rotating shaft via a gap, and a radial distance to the cutter head at appropriate intervals In a pelletizer device provided with a plurality of cutter blades provided in
To keep the parallelism of the plurality of cutter blade with respect to said plurality of constantly said die face cutter blade evenly contacts the die face when pressed against the die face, the cutter head, said rotary shaft around a rotation axis in the front end surface of the rotary shaft while it is supported to be tilt by the fitting portion provided to protrude to the rotation axis of the front end surface of the rotation axis in the cross direction of the rotation axis A pelletizer device characterized in that it is pressed and held by the fitting portion by a biasing force of a plurality of biasing means disposed at substantially equal intervals in a circular shape between the cutter blades . The fitting portion is pelletizer apparatus of claim 1, wherein that it is convex spherical surface, or the concave spherical portion.

Images