JPH0627372Y2 - Plastic granulator and cutter blade for plastic granulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a plastic granulator and a cutter blade for a plastic granulator, and more particularly, to a high-performance cutter blade without cooling the die surface and wasting energy. It relates to new improvements for efficient cooling.

[Prior Art] There are various plastic granulating apparatuses of this type that have been conventionally used, and a typical one of them is shown in FIGS. 7 to 10. .

First, in the case of the first conventional example shown in FIGS. 7 and 8, what is indicated by reference numeral 1 in the drawings is a die, and the die surface 1a of this die 1 is attached to the cutter holder 3 of the cutter shaft 2. The provided cutter blades 4 are attached so as to be substantially joined.

Three cutter blades 4 are attached to the peripheral edge of the cutter holder 3 at equal intervals, and a projecting portion 3 a is formed at the center of the cutter holder 3.

The cutter shaft 2 is provided with a first cooling water passage hole 5, and the first cooling water passage hole 5 is formed in the cutter holder 3.
Is connected to the L-shaped second cooling water passage hole 6 formed in the above, and the discharge portion 6a of the second cooling water passage hole 6 is configured to discharge the cooling water toward the cutter blade 4. ing.

A pipe 8 connected to a cooling water supply device 7 is connected to the first cooling water passage hole 5, and cooling water from the cooling water supply device 7 passes through the cooling water passage holes 5 and 6. By being supplied to each cutter blade 4 from the discharge port 6a through the water, each cutter blade 4 is sprayed with water for cooling.

Further, in the case of the second conventional example shown in FIG. 9 and FIG. 10, the same parts as those of the above-mentioned first conventional example are designated by the same reference numerals,
A description thereof will be omitted, and only the configuration different from the first conventional example will be described. In the first conventional example, the axial center of the cutter shaft 2 and the center of the die surface 1a coincided with each other.
In the conventional example, the axis of the cutter shaft 2 and the die surface 1 of the die 1
The center of a is displaced, and the discharge port 6a for discharging the cooling water from the cooling water supply device 7 is located above the surface of the cutter blade 4.

[Problems to be Solved by the Invention] Since the conventional plastic granulating apparatus is configured as described above, the following problems exist.

That is, in general, in the case of molten resin, since it has a property of easily adhering to the high temperature portion, a part of the resin material extruded from the die or the particulate resin material after cutting with the cutter blade adheres to the cutter blade. Therefore, since the normal cutting cannot be performed, the cutter blade is cooled.

However, as in the first conventional example described above, when water is discharged from the tip of the cutter holder in the direction of the cutter blade, a part of the discharged cooling water is applied to the die surface and the die surface is cooled. Then, the resin material extruded through the holes of the die is cooled and its viscosity increases, the resistance increases and it becomes difficult to extrude, and in some cases it becomes impossible to extrude. For this reason, it is necessary to increase the extrusion pressure of the resin material or increase the heating temperature of the die to maintain the temperature of the die surface, resulting in excessive consumption of extra energy.

Further, in the case of the configuration in which the axial center of the cutter shaft is located outside the die surface as in the second conventional example,
The cutter blade became long, and the plastic granulator including the protective case for this cutter blade was upsized.

The present invention has been made in order to solve the above problems, and in particular, a plastic granulating apparatus capable of cooling a cutter blade with high efficiency without cooling the die surface and wasting energy. The purpose is to provide.

[Means for Solving the Problems] In the plastic granulating apparatus according to the present invention, the molten resin extruded from the die is held via a cutter shaft and a cutter holder so as to rotate in parallel with the die surface of the die. In a plastic granulating device that is cut by a cutter blade, it has first, second and third cooling water passage holes formed in the cutter shaft, cutter holder and cutter blade, and is formed in the cutter blade. The outlet of the third cooling water passage hole is opened in the radial direction, and the outlet is located outside the peripheral edge of the die surface.

Further, in detail, provided on the outer periphery of the cutter shaft,
The water supply box communicates with each of the cooling water passage holes, and a cooling water supply device connected to the water supply box.

Since the cutter blade for the plastic granulator according to the present invention cuts the molten resin extruded from the die, the cutter blade for the plastic granulator provided in the cutter holder has the second cooling water formed in the cutter holder. The third cooling water passage hole is formed so as to communicate with the passage hole and open radially from the tip of the passage hole.

[Operation] In the plastic granulation device according to the present invention, the cooling water supplied from the cooling water supply device reaches the cutter blade through the cutter shaft and the cutter holder, and the cooling water passage formed inside the cutter blade. It passes through the hole and is emitted radially from the tip thereof.

Therefore, while passing through the inside of the cutter blade, the cooling water removes heat from the cutter blade, and the cutter blade is cooled.

Also, since the outer edge of the cutter blade passes outside the outer periphery of the die surface, the cooling water discharged radially from the tip of the cutter blade does not directly reach the die surface, and the die surface is cooled by the cooling water. The resin can be extruded normally without being cooled by.

[Examples] Hereinafter, preferred examples of the plastic granulator and the cutter blade for the plastic granulator according to the present invention will be described in detail with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example will be described using the same reference numerals.

1 to 6 are for showing a cutter blade for a plastic granulator and a plastic granulator according to the present invention. FIG. 1 is a sectional view showing the entire structure, and FIG. 2 is a cutter blade. The front view shown in FIG. 3, FIG. 3 is the right side view of FIG. 2,
4 is a sectional view taken along the line AA of FIG. 2, and FIGS. 5 and 6 are sectional views showing another embodiment of FIG.

In FIG. 1, reference numeral 1 designates a die, and a die surface 1a of the die 1 is provided with a resin discharge port 1b for discharging the molten resin in a string shape.

A cutter shaft 2 having a cutter holder 3 is rotatably provided at a position facing the die 1 by a pair of bearings 20 and 21, and a rear end 2a of the cutter shaft 2 is driven via a shaft joint 22. It is connected to the drive shaft 23a of the device 23.

A water supply box 24 connected to the cooling water supply device 7 via a pipe 8 is provided on the outer periphery of the cutter shaft 2.
The water supply box 24 is fixed in a non-rotating state by fixing means (not shown), and a waterproof seal 24a is provided between the water supply box 24 and the cutter shaft 2.

The water supply box 24 is formed with a water guide recess 25 communicating with the pipe 8 from the cooling water supply device 7, and the first cooling water passage hole 5 formed along the axis of the cutter shaft 2. Communicates with the water guide recess 25.

In the cutter holder 3, the first cooling water passage hole 5 is provided.
An L-shaped second cooling water passage hole 6 is formed to communicate with the cutter blade 4, and the cutter blade 4 is fixed by providing a fixing means (not shown) such as a bolt on the peripheral edge 3a of the attachment hole 4a. There is.

An L-shaped third cooling water passage hole 26 communicating with the second cooling water passage hole 6 is formed in the cutter blade 4, and the blade portion 4b and the joint surface are formed on one surface of the cutter blade 4. 4c is formed.

The blade portion 4b is located corresponding to the resin discharge port 1b, and the bonding surface 4c is bonded to the die surface 1a.

The inlet portion 26a of the third cooling water passage hole 26 is connected to the second cooling water passage hole 6, and the outlet portion 26b thereof is located at the outer end 4e of the cutter blade 4 and is open to the outside in the radial direction. In addition, the outlet portion 26b is located outside the peripheral edge 1aA of the die surface 1a.

The third cooling water passage hole 26 is formed parallel to the surface direction of the die surface 1a and also parallel to the blade portion 4b.

The cross-sectional shape of the third cooling water passage hole 26 is circular, but is not limited to this circular shape. For example, as shown in FIG. 5, another pair of passage holes 26c may be added. As shown in FIG. 6, it is also possible to make it non-circular, and in the case of these other embodiments, the shape of the third cooling water passage hole 26 is set so as to increase the amount of cooling water and to make the passage position of the cooling water the blade. The blade portion 4b is configured to be as close as possible to the portion 4b so that the blade portion 4b can be cooled more effectively.

Therefore, in the above configuration, when the cooling water is supplied from the cooling water supply device 7 while the cutter shaft 2 is rotated by the drive device 23 and the cutter blade 4 is rotated, the cooling water is guided in the water guide box 24. Through the recess 25, the first, second and third cooling water passage holes 5, 6 and 26, the outlet portion 26b
To the outside.

In this case, when the cooling water passes through the third cooling water passage hole 26, heat exchange with the cutter blade 4 is performed to cool the cutter blade 4, but the water discharged from the outlet portion 26b is Since the position of the outlet portion 26b is located outside the peripheral edge 1aA, it does not cover the die surface 1a, and unnecessary cooling of the die 1 and the die surface 1a can be prevented.

The case where the cooling water from the cooling water supply device 7 is supplied to the cooling water passage holes 5, 6 and 26 through the water supply box 24 has been described, but the case where the water supply box 24 is used is limited. Without using, for example, the cutter shaft 2 and the drive device 23 are connected by a gear, and the same action and effect can be obtained when the cooling water is supplied from the end surface of the cutter shaft 2 via a rotary joint (not shown). Obtainable.

[Advantages of the Invention] Since the plastic granulator and the cutter blade for the plastic granulator according to the present invention are configured as described above, the following effects can be obtained.

That is, since the cooling water is directly supplied to the cooling water passage hole formed inside the cutter blade, it is possible to cool the cutter blade without cooling the die surface portion, and always perform normal cutting. You can

Further, since it is not necessary to upsize the device in consideration of cooling the die surface portion with cooling water, it is possible to achieve energy saving without requiring extra energy for extrusion and granulation of the resin material unlike the conventional case. be able to.

[Brief description of drawings]

1 to 6 are for showing a plastic granulator and a cutter blade for a plastic granulator according to the present invention. FIG. 1 is a cross-sectional view showing the entire structure, and FIG. 2 is a cutter blade. The front view shown in FIG. 3, FIG. 3 is the right side view of FIG. 2,
FIG. 4 is a sectional view taken along the line AA in FIG. 2, FIGS. 5 and 6 are sectional views showing another embodiment of FIG. 3, and FIGS. 7 to 10 show conventional devices. FIG. 7 is a front view of the first conventional cutter blade, and FIG. 8 is a configuration diagram including a cross section,
FIG. 9 is a side view including a partial cross section showing another second conventional example,
FIG. 10 is a plan view of FIG. 1 is a die, 1a is a die surface, 2 is a cutter shaft, 3 is a cutter holder, 4 is a cutter blade, 5, 6 and 26 are cooling water passage holes, 24 is a water supply box, and 26b is an outlet portion.

Claims (3)

[Scope of utility model registration request] 1. A molten resin extruded from a die (1) is held via a cutter shaft (2) and a cutter holder (3) so as to rotate parallel to the die surface (1a) of the die (1). In the plastic granulating device which is designed to cut by the cutter blade (4), the first, second and third cutter shafts (2), the cutter holder (3) and the cutter blade (4) are formed. It has cooling water passage holes (5, 6, 26) and the cutter blade
The outlet (26) of the third cooling water passage hole (26) formed in (4)
b) is opened in the radial direction and the outlet (26
b) is a plastic granulating apparatus characterized in that it is located outside the peripheral edge (1aA) of the die surface (1a). 2. A water supply box (24) provided on the outer circumference of the cutter shaft (2) and communicating with the cooling water passage holes (5, 6, 26), and connected to the water supply box (24). The plastic granulating apparatus according to claim 1, further comprising a cooling water supply device (7). 3. A cutter blade for a plastic granulator provided on a cutter holder (3) for cutting molten resin extruded from a die (1), wherein a second blade formed on the cutter holder (3) is used. Cooling water passage hole
A cutter blade for a plastic granulating device, characterized in that it has a third cooling water passage hole (26) communicating with (6) and opening radially outward from its tip.