JPS5845065Y2 - Strand cutter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutter, and more particularly to a strand cutter that is widely used in resin granulation equipment and the like because it is inexpensive and easy to handle compared to other cutters.

Figure 1 is a schematic diagram showing an example of a strand cutter, Figure 2 is a schematic diagram showing an example of a strand cutter.
The figure shows a simplified cross-sectional view taken along the line A-A in FIG. 2 is its rotating shaft, 3 is two bearings supporting both ends of this rotating shaft 2, and 5 is a shaft coupling 4 on the rotating shaft 2.
The rotation drive machines 6 and 7 connected through the two are take-up rolls for forcibly and continuously drawing the strand resin solidified into a string onto the fixed blade 14.

Such a strand cutter uses a fixed blade 14 to forcibly remove the strand resin that has solidified into a string shape using a take-up roll 6.7.
The blade is continuously retracted upward, and the rotary blade 1 rotated by the drive machine 5 in the vicinity of the fixed blade 14 sequentially cuts the blade.

However, since this cutter cuts the resin to be cut when it is completely solidified, a large amount of noise is generated during cutting, and the noise level is normally about 90 to 110 dB.

If the noise level exceeds 90 dB, the working environment for the operator will be very poor, and operating this machine for a long time may cause a headache.

Conventionally, in order to reduce this noise, the entire device was covered with a soundproof cover at great expense.

However, the installation of a soundproof cover made it impossible for the operator to see inside the machine, making it difficult for the operator to operate the machine.
Also, if there is even a slight gap between the device and the soundproof cover,
This has the drawback that noise leaks through the gaps, reducing the noise reduction effect and deteriorating the working environment.

The present invention was developed in view of the above-mentioned drawbacks, and aims to improve the working environment by reducing the noise level to 85 dB or less, and also allows the operator to easily operate the machine.
It is an object of the present invention to provide a strand cutter that can be carried out at low cost.

An embodiment of the present invention that achieves the above object will be described below with reference to the drawings.

FIG. 3 is a sectional view showing the essential parts of an embodiment of the present invention taken along line BB in FIG. 1, and FIG. 4 is a partial sectional view of an embodiment of the invention taken along line AA in FIG. 1. , this embodiment has a large number of cutting edges 12 on the outer periphery, and adjacent cutting edges 12
A large number of air suction holes 11 and air suction holes each having a diameter of 6 to 8 mm are opened in each of the relief portions 15 in the rotary blade 1 and the rotating shaft 2 fitted therein. 16 are bored radially toward the axis, and an annular groove 13 is provided between the fitting surfaces of the rotary blade 1 and the rotary shaft 2, for example, on the inner circumferential surface of the rotary blade 1, to communicate the air suction holes 11 and 16. Form.

The annular groove 13 is connected to each air suction hole 11 of the rotary blade 1 as shown in the figure.
If the air suction holes 16 of the rotary blade 1 and the rotary shaft 2 are separately drilled and the rotary blade 1 and the rotary shaft 2 are fitted, each of the air suction holes 11 and 16
The rotary blade 1 and the rotary shaft 2 are integrally constructed, and each air suction hole 11.
It is not provided when 16 holes are to be drilled all at once.

Each air suction hole 11 is located at the axis of the rotating shaft 2 of the rotary blade 1.
An air suction hole 10 is formed in each of the shafts through an annular groove 13 and an air suction hole 16, and the air suction hole 10 is opened at the end of the shaft. This connects an exhaust device, for example, an exhaust blower 9 with a silencer.

It goes without saying that the rotary shaft 2 of the rotary blade 1 is connected to a rotation drive unit 5 via a shaft coupling 4, similar to that shown in FIG.

Since the present invention has the above-mentioned configuration, the above-mentioned first and second
Strand resin 17 solidified into a string like the device shown in the figure
is continuously drawn into the fixed blade 14 as shown in FIG. 4 by the take-up roll 6.7, and rotated in the counterclockwise direction shown by the arrow in FIG. The rotary blade 1 sequentially cuts.

The cutting speed is determined depending on the hardness and chipping/fragility of the strand resin 17, but is usually 4 to 8 m/SeC.

1. Not taking measures to reduce noise. In the case of the device shown in the second figure, when the strand resin 17 is cut by the rotary blade 1, the trapped air accompanied by the impact sound at the time of cutting is momentarily trapped in the pocket formed by the fixed blade 14 and the relief part 15.
The noise is then emitted into the atmosphere, which continuously generates noise.However, in the case of the device of the present invention shown in Figures 3 and 4, which takes measures to reduce noise, the impact noise trapped in the pocket is reduced. The entrained air with the pocket has more air suction holes 11. Because it is sucked by the exhaust blower 9 through the annular groove 13 and the air suction hole 16.10 and taken out to the outside,
Compared to the case where no noise reduction measures are taken, the noise level can be reduced by 10 to 15 dB to 85 dB or less, which not only improves the working environment, but also allows you to see inside the equipment. The machine can be easily operated by an operator, and it can be implemented at a low cost even though noise reduction measures have been taken.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing an example of a strand cutter, Figure 2 is a schematic diagram showing an example of a strand cutter.
The figure is a simplified sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view taken along the line BB in FIG. FIG. 2 is a partial cross-sectional view of an embodiment of the present invention taken along line A-A. 12... Cutting edge, 15... Relief part, 1.
... Rotating blade, 10, 11° 16 ... Air suction hole, 2 ... Rotating shaft, 9 ... Exhaust device, 14 ... Fixed blade, 13... annular groove.

Claims (1)

[Scope of utility model registration request] A rotary blade 1 has a large number of cutting edges 12 on the outer periphery, and a relief part 15 is formed between each adjacent cutting edge 12, and a large number of air suction holes 11 opened in each relief part 15 are arranged around the axis. Air suction holes 10 are formed in the axial center of the rotary shaft 2 of the rotary blade 1 in a radial direction, and communicate with these air suction holes 11 through air suction holes 16, respectively, and open at the ends of the shaft. At the same time, an exhaust device 9 is connected to the opening of the air suction hole 10.