JP3471592B2 - Knife holder for resin granulator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a knife holder of a resin granulator to which a knife for cutting molten resin extruded from a die plate in cooling water is attached. The technical field of a knife holder of a resin granulator, in which a gap generated between a hardened surface of a die plate and a blade surface of a knife is reduced to prevent deterioration of the shape of a resin pellet. It belongs to 2. Description of the Related Art As a resin granulator for producing resin pellets by cutting a molten resin extruded from a die plate with a knife supported by a holder rotating in water, for example, Application 7-4011
"Pelletizer" disclosed in Japanese Patent Publication No. 2 (conventional example 1)
And an underwater cut granulation apparatus disclosed in JP-A-6-79720 (conventional example 2). Hereinafter, the outlines of Conventional Examples 1 and 2 will be described with reference to the accompanying drawings. [0003] First, a pelletizer according to Conventional Example 1 (hereinafter referred to as a pelletizer)
It is called a resin granulator. The outline of FIG.
Referring to FIG. 4A and the rear view showing the state where the knife is mounted on the knife holder, the same reference numerals and the same names as those in the specification will be used. Reference numeral 1 denotes a resin granulator.
A die plate 4 having a large number of pores (hereinafter, referred to as nozzles) 3 formed at the tip of an extrusion cylinder 2 and a water chamber 5 covering the outer periphery and front of the die plate 4 are mounted, and A plurality of knives 6 rotatably supported in the chamber 5
It has. A screw (not shown) is built in the extrusion cylinder 2 so that the molten resin can be extruded from the front surface of the die plate 4 into the water chamber 5 through the nozzle 3. [0004] As shown in FIG. 4 (b), the knife 6 is bolted to a rear surface 8 a of a knife holder 8 whose base 6 a is arranged facing the front surface of the die plate 4. A rotary shaft 10 is mounted and fixed to the center of the front surface of the knife holder 8. The rotary shaft 10 is supported by a bearing 11 mounted and fixed to the water chamber 5 so as to be rotatable and movable in the axial direction. The motor 6 is driven to rotate around an axis by a motor (not shown), so that the knife 6 is rotated at a high speed in a direction indicated by an arrow B in a counterclockwise direction. A cutting edge (hereinafter, referred to as a blade surface) 6 at the leading edge in the rotation direction of the knife 6.
b is in contact with the front surface of the die plate 4, and the molten resin extruded from the nozzles of the die plate 4 is solidified by flowing water (hereinafter referred to as cooling water) in the water chamber 5 and cut at the same time. It is configured to be.
The cooling water in the water chamber 5 flows in from below the water chamber 5 and is discharged from the drain port 7 on the upper side. Next, an outline of an underwater cut granulator (hereinafter, referred to as a resin granulator) according to Conventional Example 2 is shown in a state where a water chamber thereof is separated from a die (hereinafter, referred to as a die plate). Referring to FIG. 5 of FIG.
The water chamber 2 is pressed into contact with a die plate 3 attached to a screen changer 1a connected to a booster. A cutting blade (hereinafter, referred to as a knife) 4 is supported in the water chamber 2 in a cantilever manner. This knife 4
Is connected to a motor (not shown) by a rotating shaft 5, and is rotatable and movable forward and backward in contact with a nozzle hole (hereinafter, referred to as a nozzle) 3 a provided in the die plate 3. The cooling water PCW is supplied to the water chamber 2 from below and discharged upward. [0006] When resin pellets are manufactured by the resin granulator having such a configuration, first, a resin material is supplied from a feeder to a kneader, melted and kneaded, and sent out to a booster. Next, the molten resin 9 pressurized by the pressurizer is extruded into the water chamber 2 from the nozzle 3a provided on the die plate 3 via the screen changer 1a, and the cooling water PCW is extruded.
The blade surface of the rotating knife 4 is pressed against the die plate 3 and cut to a required size while cooling. [0007] The resin granulators according to the prior art examples 1 and 2 are all useful as such. However, when the length of the knife is long, problems to be solved occur as described later. That is, the knife of the resin granulator according to the above-described conventional example is configured to be cantilevered as can be well understood from the description of the configuration of the conventional example and the accompanying drawings. As described above, the resin granulator presses the blade surface of the rotating knife against the die plate to cut the resin extruded from the nozzle provided on the die plate. Accordingly, if the length of the knife is increased, the bending is inevitably increased, so that a gap is generated between the die plate and the blade surface of the knife. If there is a gap between the die plate and the blade surface of the knife, the shape of the resin pellets will deteriorate, so even if there is a request for an increase in the size of the resin granulator, it cannot be met. There were challenges. Accordingly, an object of the present invention is to provide a knife for a resin granulator capable of reducing a gap generated between a die plate and a blade surface of a knife even if the length of the knife is long. The purpose is to provide a holder. [0009] The present invention has been made in view of the above-mentioned circumstances, and therefore, in order to solve the above-mentioned problems, a resin granulator according to claim 1 of the present invention is provided. A feature of the means adopted by the knife holder is that a plurality of knives that are rotated by a rotating shaft and cut into molten resin extruded from a nozzle provided on a die plate in cooling water to form resin pellets are attached. In a knife holder of a resin granulator, an inner holder portion which is rotated by the rotation shaft and has a small diameter to which one end side of a knife is fixed, and which is provided outside of the inner holder portion in a radially outward direction, is provided. And the outer holder part having a large diameter to which the other end of the knife is fixed. Hereinafter, a first embodiment of the present invention will be described.
The configuration of the knife holder of the resin granulator
The knife attached to the knife holder
FIG. 1 of a partial cross-sectional side view showing a state of being applied.
(A) and FIG. 1 (b) as viewed from the line AA in FIG. 1 (a).
And FIG. 2 which is an explanatory diagram of a cutting state of the resin by the knife.
I will explain while. However, the resin according to the first embodiment
The configuration other than the knife holder of the granulator is the same as that of the above-mentioned conventional example 1 or
Is a configuration equivalent to the configuration of the resin granulator according to Conventional Example 2.
Therefore, description of the configuration of the resin granulator itself is omitted. Reference numeral 1 shown in FIG .
The molten resin is extruded on the die plate 1.
Many nozzles 1a are provided.
The surface of the die plate 1 where the nozzle 1a opens is a hardened surface 1
b. On the cured surface 1b of this die plate 1
Is rotated by a rotating shaft 2 rotated by a motor (not shown).
Is melted and extruded from the nozzle 1a of the die plate 1.
Configuration to be described later, in which resin is cut in water to form resin pellets
Multiple knife holders attached to the knife holder 3
The blade surface 4a of the sleeve 4 is pressed. The knife holder 3 is shown in FIGS.
As can be understood from FIG.
The diameter at which the mounting portion 4b provided on the end side is bolted is
A small-diameter inner holder portion 3a and the inner holder portion
3a, which is provided on the other end side of the knife 4 outside in the radial direction.
Large diameter outer to which the mounting part 4c is bolted
And a holder part 3b.
The portions 3a and 3b are formed by a disc portion 3c rotated by the rotation shaft 2.
It is formed integrally. And these in outer
-Die plate from the disk part 3c of the holder parts 3a, 3b
The protruding portions in one direction are connected by four ribs 3d.
ing. Attach to knife holder 3 according to the first embodiment
The number of knives 4 that can be cut is four, and these four
Each of the knives 4 is as shown in FIG.
In addition, the inner and outer holder portions 3 of the knife holder 3
a between the rib 3d connecting the ribs 3a and 3b
Is attached. The number of ribs 3d and the attachment of knife 4
The number of the ribs 3 can be appropriately set.
It is not limited to the number of d and the number of knives 4 attached.
No. Hereinafter, the knife holder 3 having the above configuration will be described.
The mode of operation of the attached knife 4 will be described.
Similarly to the resin granulator according to Examples 1 and 2,
At the same time when the cooling water is extruded from the nozzle 1a,
As shown in FIG. 2, the resin cooled and solidified by
Mounting portions 4 at both ends of knife 4 with both ends bolted
b, 4c are cut by a blade surface 4a formed between
Thus, resin pellets 5 are manufactured. By the way, according to the first embodiment,
The knife 4 of the granulator is cantilevered as in Conventional Examples 1 and 2.
However, as described above, the mounting portion 4b on one end side is
The mounting part 4c on the other end is attached to the outer holder part on the rudder part 3a.
3b and are supported at both ends. Therefore, even if the knife 4 is long, it hardly bends.
Between the hardened surface 1b of the plate 1 and the blade surface 4a of the knife 4
There is no gap in
One resin pellet 5 can be manufactured and a knife
Since the length of 4 can be made longer, use a resin granulator
There is an excellent effect that the size can be increased. Next, a resin molding according to a second embodiment of the present invention will be described.
Make sure the knife holder of the granulator is
Referring to FIG. 3 showing a part of the knife holder,
For clarity, reference numeral 1 shown in FIG.
This die plate 1 has the same configuration as die plate 1.
The hardened surface 1b of the disk 1 is rotated by a rotating shaft (not shown).
Molten wood extruded from the nozzle 1a of the die plate 1
Cut the fat in water to make resin pellets
Knives 13 attached to the knife holder 13
The blade surface 14a of the hook 14 is pressed. The knife holder 13 is well understood from FIG.
As will be understood, it is rotated by a rotating shaft not shown
Disk-shaped knife holder body 13a and knife holder
The knife 1 protrudes radially from the main body 13a,
Knife mounting where the longitudinal central part of 4 is bolted
A knife support arm 13b having a portion 13b 'at its distal end;
It is composed of The rigidity of the knife support arm 13b
Is determined by pressing the blade surface 14 a of the knife 14 against the die plate 1.
High rigidity is set in consideration of the force. Note that the actual
Similarly to the knife holder according to the first embodiment, the knife holder
The number of knives 14 attached to 13 is omitted from illustration.
There are four. Of course, the number of knives 14 to be attached can be set as appropriate.
is there. Hereinafter, the knife holder 13 having the above configuration will be described.
The operation of the attached knife 14 will be described.
The knife 14 according to the second embodiment is a
Not as cantilevered, as described above,
The central part in the longitudinal direction is the tip of the knife support arm 13b
Is attached to the knife attachment portion 13b 'of
Of the knife 14 having the same length and the same rigidity,
This is improved to about 1/2 of the case of Conventional Examples 1 and 2. Follow
And the hardened surface 1b of the die plate 1 and the blade surface 1 of the knife 14
4a is reduced. Therefore, resin pellets 5 having an excellent shape can be manufactured, and the size of the resin granulator can be increased, so that the same effect as in the first embodiment can be obtained. The knife holder according to the second embodiment
In the case of the da 13, the central part in the longitudinal direction of the knife 14 is
Knife dispersing attachment 1 at the tip of knife support arm 13b
3b ', but for example, a knife holder
The outer diameter of the body 13a is defined by the circle at the tip of the knife support arm 13b.
Make the knife holder body 13 the same size as the diameter of the locus.
a in the longitudinal direction of the knife 14 inside the outer edge of
It is also possible to provide a knife mounting part for mounting
The knife support arm 13b is indispensable
Not. As described above, according to the first aspect of the present invention,
According to the knife holder of such a resin granulator, both ends of the knife
Is supported. Therefore, the resin extruded from the nozzle is cut
Even if the knife is pressed against the die plate during cutting,
The bending of the knife caused at the time of the cutting is 1 /
2 or less to produce resin pellets with excellent shape
And the knife can be longer
Therefore, the size of the resin granulator can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A relates to a first embodiment of the present invention, and FIG. 1A shows a state in which a knife attached to a knife holder is pressed against a die plate of a resin granulator. FIG. 1B is a side view taken along line AA of FIG. 1A. FIG. 2 is an explanatory diagram of a cutting state of a resin by a knife according to the first embodiment of the present invention. FIG. 3 is a view showing a part of a knife holder to which a knife is attached according to the second embodiment of the present invention. 4 (a) is a side sectional view of a resin granulator, and FIG. 4 (b) is a rear view showing a state in which a knife is mounted on a knife holder, according to Conventional Example 1. FIG. FIG. 5 is a view showing a state where a water chamber of a resin granulator is separated from a die plate according to Conventional Example 2. DESCRIPTION OF SYMBOLS 1 ... die plate, 1a ... nozzle, 1b ... hardened surface 2 ... rotating shaft 3 ... knife holder, 3a ... inner holder, 3b ... outer holder, 3c ... disk part, 3d ... rib 4 ... knife, Reference numeral 4a: blade surface, 4b: mounting portion, 4c: mounting portion 5, resin pellet 13: knife holder, 13a: knife holder body, 13
b: knife support arm, 13b ': knife mounting part 14: knife, 14a: blade surface

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-1548 (JP, A) JP-A-54-127463 (JP, A) JP-A-8-507007 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B29B 9/06

Claims (1)

(57) [Claims 1] A plurality of knives which are rotated by a rotating shaft and cut into molten resin extruded from a nozzle provided on a die plate in cooling water to form resin pellets are attached. In the knife holder of the resin granulator to be rotated, the diameter at which one end of the knife is fixed by being rotated by the rotation shaft is small.
And the inner holder portion of, radially outwardly of the inner holder portion
The outer periphery of the knife is provided with an outer holder part having a large diameter and the other end side of the knife is co-rotated with the inner holder part. Knife holder.