JP2642579B2 - Pelletizer cutter holder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter holder device for a pelletizer, and more particularly, to a cutter shaft and a cutter holder which are connected to each other via an involute spline and an elastic member under severe temperature conditions and continuous operation for a long time. Always relates to a new improvement for bringing the cutter blade in full contact with the die surface.

[0002]

2. Description of the Related Art There are various types of cutter holder devices of this type of pelletizer which have been used in the past. Among them, a typical one is shown in FIG. 3 which is generally employed. it can. That is, what is indicated by reference numeral 1 in FIG. 3 is a cutter shaft, and a cutter holder 3 having a substantially T-shaped cross section is coupled to the cutter shaft 1 via a key 2 so as to rotate integrally.

The front end surface 1a of the cutter shaft 1 has
A support member 5 is provided via a bolt 4, and the rear end 3 a of the cutter holder 3 abuts on the end surface of the shoulder 1 b of the cutter shaft 1 and is positioned by the support member 5.

A plurality of cutter blades 6 are fixed to the mounting peripheral portion 3b of the cutter holder 3 via mounting bolts 7. Each of the cutter blades 6 is pressed against a die surface 8a of a die 8 and comes into contact therewith. It is configured to slide and rotate.

Therefore, in the above-described configuration, when each cutter blade 6 rotates while sliding on the die surface 8a via the cutter shaft 1 and the cutter holder 3 under water or in the air,
The molten resin discharged from the die 8 is cut by each cutter blade 6 and pelletized.

[0006]

Since the conventional cutter holder device of the pelletizer is constructed as described above, the following problems exist. That is, in general, in order to obtain a pellet having a good shape, it is necessary that each cutter blade is constantly in contact with the entire surface of the die surface and slides, and strict precision is required at a right angle to the cutter shaft and the die surface. I have. Therefore, it is necessary to make the connection between the cutter shaft and the cutter holder into a cylindrical gap and a loose fit without play, and to form them integrally, and the transmission of torque from the cutter shaft to the cutter holder is performed via a key. . However, when the pelletizer is used under severe temperature conditions such as high temperature, temperature change, temperature unevenness, etc., the cutter generated due to unbalanced distortion due to thermal expansion of the cutter holder device and wear of the support member of the cutter shaft during long-time continuous operation. Due to the deviation of the shaft center of the shaft, etc., the perpendicularity between the cutter shaft and the die is deviated, and as a result, a slight gap is generated partially between the cutter blade and the die surface. It was extremely difficult to obtain pellets that were not uniform and had a good shape.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, by connecting a cutter shaft and a cutter holder via an involute spline and an elastic member, a severe temperature condition and a long time are required. An object of the present invention is to provide a cutter holder device of a pelletizer in which a cutter blade is always brought into complete contact with a die surface even during continuous operation.

[0008]

According to the present invention, there is provided a cutter holder device for a pelletizer, in which a cutter blade is mounted on a cutter holder connected to a cutter shaft, and the cutter blade is pressed against a die to cut the resin. The cutter holder device includes a crown-processed involute spline for transmitting torque from the cutter shaft to the cutter holder, and an elastic member provided on a front end surface of the cutter shaft via a bolt and joined to the cutter holder. is there.

More specifically, the elastic member has a disk shape and has a ring-shaped thin portion.

[0010]

In the cutter holder device of the pelletizer according to the present invention, the torque transmission mechanism of the crowned involute spline provided between the cutter shaft and the cutter holder enables the cutter holder to be tilted with respect to the axis of the cutter shaft, thereby enabling the cutter holder and the die surface to be inclined. And the elastic member elastically supports the cutter holder on the cutter shaft, thereby enabling the involute spline to absorb the irregularity.
Even under high temperature and unsteady temperature conditions or when the shape changes over time, the cutter blade always follows so as not to generate a gap between the die surface and thereby always obtain a pellet having a good shape. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a cutter holder device for a pelletizer according to the present invention will be described below in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. FIG. 1 is a sectional view showing a cutter holder device of a pelletizer according to the present invention.

In FIG. 1, reference numeral 1 denotes a cutter shaft, and the cutter shaft 1 and a cutter holder 3 having a substantially T-shaped cross section are connected so as to rotate integrally with an involute spline 2 at a connection portion thereof. Have been. The tooth profile of the involute spline on the cutter shaft 1 side is crowned in the direction of the tooth trace (axial direction).

A fitting hole 3c formed in the rear part of the cutter holder 3 is fitted with a clearance around the outer periphery of the cylinder of the shoulder member 1b of the cutter shaft 1 to make the absorption function of the involute spline 2 effective. Therefore, the cutter holder 3 can be inclined with respect to the axis of the cutter shaft 1. On the front end surface 1a of the cutter shaft 1, an elastic member 30 having a substantially disk-shaped leaf spring shape and an annular thin portion 30a is fixedly provided via a bolt 4. A support member 5 having a plate shape is provided on the front side of the elastic member 3 via a fixing screw 5a.
No. 0 is fixed to the cutter holder 3 with the outer peripheral portion sandwiched therebetween. The support member 5 has an inner peripheral portion formed of an elastic member 30.
The cutter holder 3 can be inclined with respect to the axis of the cutter shaft 1 in order to make the absorption function of the involute spline 2 effective.

An O-ring 2 is provided between the fitting hole 3c of the cutter holder 3 and the inner peripheral portion of the support member 5.
0 and 21 are provided, and these O-rings 20 and 21 are provided.
Serves as a buffer when the cutter holder 3 is inclined with respect to the axis of the cutter shaft 1, and also serves as a seal when used as an underwater pelletizer. A plurality of cutter blades 6 are fixed to a mounting peripheral portion 3b of the cutter holder 3 via mounting bolts 7, and each of the cutter blades 6 is pressed against a die surface 8a of a die 8 and slides while rotating. It is configured to be.

Therefore, in the above configuration, the die surface 8
Even when the perpendicularity of the cutter shaft 1 with respect to a is different, the cutter holder 3 provided with the cutter blade 6 can
The cutter holder 1 can be freely tilted with respect to the cutter shaft 1 via the crowned involute spline 2 and is supported by an elastic member 30 having an elastic action such as a leaf spring. Each of the cutter blades 6 to which the required surface pressure is applied to the die surface 8a via the die surface 8a always completely contacts the entire surface of the die surface 8a, and can rotate with no gap therebetween.

FIG. 2 shows another embodiment. In this embodiment, the elastic member 30 is directly fixed to the cutter holder 3 via a fixing screw 5a. The elastic member 30 elastically supports the cutter holder 3 with respect to the cutter shaft 1 as in the above-described embodiment, and enables the cutter holder 3 to be inclined with respect to the cutter shaft 1.

Accordingly, in the above-described configuration, each cutter blade 6 rotates while sliding on the die surface 8a via the cutter shaft 1 and the cutter holder 3 under water or in the air, so that the melt discharged from the die surface 8a is rotated. The resin is cut by each cutter blade 6 having a constant cutting condition, and cut into pellets having a good shape.

[0018]

Since the cutter holder device of the pelletizer according to the present invention is configured as described above, the following effects can be obtained. That is, since the crown-processed involute spline and the elastic member are provided between the cutter shaft and the cutter holder, even when the perpendicularity of the cutter shaft to the die surface is deviated, the cutter blade is formed by the involute spline and the elastic member. The die surface is completely contacted, the gap between them can be kept zero under any temperature condition or shape change over time, and a pellet having a good shape can always be cut and obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cutter holder device of a pelletizer according to the present invention.

FIG. 2 is a sectional view showing a cutter holder device of another pelletizer according to the present invention.

FIG. 3 is a cross-sectional view showing a conventional cutter holder device of a pelletizer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cutter shaft 1 a front end face 2 involute spline 3 cutter holder 4 bolt 6 cutter blade 8 die 30 elastic member 30 a ring-shaped thin portion

Claims (2)

(57) [Claims] A cutter blade (6) is mounted on a cutter holder (3) connected to a cutter shaft (1), and the resin is cut by pressing the cutter blade (6) against a die (8). In the cutter holder device of the pelletizer, a crown-processed involute spline (2) for transmitting torque from the cutter shaft (1) to the cutter holder (3), and a bolt (4) on a front end surface (1a) of the cutter shaft (1). ) Is provided via an elastic member (30) joined to the cutter holder (3).
And a cutter holder device for a pelletizer. 2. The cutter holder device for a pelletizer according to claim 1, wherein said elastic member has a disk shape and has an annular thin portion.