JPH06142543A - Runner grinding machine - Google Patents

Abstract

PURPOSE:To prevent a runner from passing through a grinding machine without grinding and to perform surely shearing. CONSTITUTION:Rotating blades 5 fixed on a rotating shaft 4 at a specified interval is constituted of the first rotating blades 5A each having an inclined blade face 54, an inclined face 55 and a plurality of recessed parts 53 each consisting of a shearing part connecting these inclined blade face 54 and inclined face 55 and the second rotating blades 5B each of the both sides of which are pinched by the first rotating blades and which each have a recessed part 53 overlapping the recessed part 53 of the first rotating blade 5A and are formed in a smaller rotational diameter than the rotational diameter of the first rotating blade 5A. In addition, a fixed blade 6 is constituted of the first fixed blade 6A positioned closely to the side face of the first rotating blade 5A and the second fixed blade 6B positioned oppositely and closely to the peripheral face of the second rotating blade 5B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a runner crusher.

[0002]

2. Description of the Related Art Conventionally, a runner crusher has been used to crush and reuse a runner generated when a plastic product is molded by an injection molding method (for example, Japanese Patent Publication No. 60-31543). reference).

In this runner crusher, a plurality of rotary blades are fixed to a rotating main shaft that rotates at a low speed via a drive device at intervals, and the fixed blades are fixed close to the side surface of the rotary blade. At least one of the rotary blades and the fixed blade is formed with an inclined blade surface for moving the runner sandwiched between the rotary blade and the fixed blade inward.

[0004]

However, in such a runner crusher, when the rotary blade is at the rotation angle position as shown in FIG. 6, a gap S between the tip of the rotary blade and the inner surface of the hopper and a pair of adjacent rotor blades are provided. As a result of the fixed blade forming a space that communicates in the vertical direction, there is a problem that when the runner R is thrown in with its longitudinal direction oriented vertically, the runner R passes through this space without being crushed. It was

In response to such a problem, it is conceivable to narrow the interval between the fixed blades so that the runner cannot pass, but as a result of the increase in the number of rotary blades, the number of places where the runner is sheared increases, resulting in a larger size. In addition to requiring a driving force to withstand the load, there is a drawback that the rigidity of the rotary blade is insufficient.

The present invention has been made in view of the above problems, and provides a runner crusher capable of reliably shearing the runner.

[0007]

According to the present invention, a rotary shaft rotatably supported by a hopper via a drive unit, a plurality of rotary blades fixed to the rotary shaft at intervals, and a hopper. A plurality of fixed blades fixed to the inner surface of each of the rotary blades, each rotary blade having a plurality of concave portions including an inclined blade surface, an inclined surface, and a shearing portion connecting the inclined blade surface and the inclined surface.
A rotary blade and a second rotary blade that is sandwiched on both sides by the first rotary blade and has a concave portion that overlaps the concave portion of the first rotary blade and that has a radius of rotation smaller than the radius of rotation of the first rotary blade. The fixed blade is composed of a first fixed blade that is arranged close to the side surface of the first rotary blade and a second fixed blade that is arranged close to the peripheral surface of the first rotary blade and faces the second rotary blade. It is characterized by being composed of a blade.

[0008]

[Operation] After rotating the rotary blade at a low speed through the drive device,
When the runner is supplied to the hopper, the runner is drawn into the shearing portion along the inclined blade surface of the rotary blade, sandwiched between the shearing portion of the rotary blade and the fixed blade, and sheared. In this case, even if the runner drops between the first fixed blades with its longitudinal direction facing up and down,
The runner collides with the second fixed blade and is prevented from passing between the first fixed blades as it is.

Therefore, no matter what posture the runner is supplied in, the runner can be reliably sheared between the shearing portion of the rotary blade and the fixed blade.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a runner crusher 1 according to the present invention. The runner crusher 1 is provided with a hopper 3 fixed on a base 2 and rotatably attached to the hopper 3. A rotary shaft 4 supported by a shaft, a plurality of rotary blades 5 fixed to the rotary shaft 4 at predetermined intervals, and a plurality of rotary blades 5 fixed to the inner surface of the hopper 3 corresponding to these rotary blades 5. Fixed blade 6,
The drive device 7 is installed on the base 2 and rotates the rotary shaft 4 at a low speed.

Each rotary blade 5 is integrally fixed to the rotary shaft 4 via a key, and a predetermined space is maintained between the adjacent rotary blades 5 and 5 by a collar 8 fitted on the rotary shaft 4. There is. The rotary blade 5 includes the first rotary blade 5A and the first rotary blade 5A.
Both sides are held by the rotary blade 5A, and the second rotary blade 5B is formed to have a radius smaller than that of the first rotary blade 5A. The second rotary blade 5B is formed into a three-sided shape when viewed from the side,
As shown in FIG. 5, it is formed by cutting out a hatched portion from the disk-shaped steel material Z.

That is, the rotary blade 5 includes the first rotary blade 5A,
5A and the second rotary blade 5B, the thickness corresponding to the sum of the thickness of the second rotary blade 5B and the outer diameter of the disk-shaped steel material Z having an outer diameter that matches the rotation radius R1 of the first rotary blade 5A. After forming a groove having a width corresponding to the thickness and a radius of gyration R2 as a bottom surface, the arcuate portion Z1 is cut off so as to be substantially in contact with the bottom surface of the groove and circular arcs of the same length remain at equal intervals. The arcuate portion Z1 is cut off to form the chord 51 and the remaining arc portion, and the convex portion Z2 is cut off. In this case, these strings 5
1 and its extension form one side of an equilateral triangle.

As a result, the first rotary blade 5A has three strings 5
1 and a circular arc portion 52 adjacent to these chords 51, and a concave portion 53 formed from the tip of the circular arc portion 52 to the adjacent chord 51. The concave portion 53 is formed by the circular arc portion 52.
The inclined blade surface 54 formed inwardly at the set angle so as to gradually increase the distance from the string 51 with the tip of the
1. The inclined surface 55 is formed from substantially the center of 1 toward the inner side of the set angle, and the inclined blade surface 54 and the shearing portion 56 connecting the inclined surfaces 55. The inclined blade surface 54 has a cycle of 120 degrees. Three are formed.

The second rotary blade 5B has three circular arc portions 5
7 and the concave portion 53 of the same shape formed so as to overlap the concave portion 53 of the first rotary blade 5A, that is, the inclined blade surface 54 formed from one end of the arc portion 57 toward the inside of the set angle.
And a concave portion 53 composed of an inclined surface 55 formed from the other end of the adjacent arc portion 57 toward the inside of the set angle and a shearing portion 56 connecting the inclined blade surface 54 and the inclined surface 55.
(See FIG. 4).

The inclined blade surface 54 formed on each rotary blade 5 is inclined so that the runner hitting this surface is drawn inward, and the rotary blade 5 is further inclined as shown in FIG.
They are sequentially fixed to the rotary shaft 4 with an appropriate phase difference.

On the other hand, the fixed blade 6 is the above-mentioned first rotary blade 5A.
The first fixed blade 6A fixed to the inner surface of the hopper 3 so as to be close to the side surface of the hopper 3 and the arc portion 57 of the second rotary blade 5B, and to be close to the peripheral surface of the arc portion 57. The second fixed blade 6B fixed on the inner surface of the first fixed blade 6A is disposed between the adjacent rotary blades 5 and 5, and the first fixed blade 5A of each rotary blade 5 is fixed to the first fixed blade 5A. 6A is designed to be shared. In addition, the second fixed blade 6
B is arranged between the adjacent first fixed blades 6A and 6A, and the first fixed blade 6A and the second fixed blade 6B are alternately arranged as clearly shown in FIG.

The drive unit 7 includes a motor speed reducer 9 installed on the base 2, and sprockets 10 and 10 fixed to the output shaft of the motor speed reducer 9 and one end of the rotary shaft 4, respectively. , These sprockets 1
It is composed of a chain 11 wound between 0 and 10, and rotationally drives the motor speed reducer 9 to rotate the rotary shaft 4 supported by the hopper 3 through the chain sprockets 10 and 11 at a low speed. ing.

Next, the operation of the present invention will be described.
When the drive device 7 is operated, the rotary shaft 4, that is, the rotary blade 5 starts low-speed rotation via the motor speed reducer 9 and the chain sprockets 10 and 11. On the other hand, from the injection molding machine (not shown), the runner is gripped by the runner take-out machine and supplied to the hopper 3 every molding cycle. Then, the runner supplied to the hopper 3 falls and lies on the rotary blade 5, is drawn into the shearing portion 56 along the inclined blade surface 54 of the rotary blade 5, and is fixed to the shearing portion 56 of the rotary blade 5. It is sandwiched by the blade 6 and sheared. In this case, since the rotary blades 5 are arranged with a phase difference, the rotary blades 5 are first sheared at any position of the runner, and then the other rotary blades 5 are sheared at other positions, so that many positions of the runners are sheared. Are not sheared at the same time, and a small driving force is sufficient.

By the way, when the runner is dropped between the first fixed blades 6A and 6A with its longitudinal direction oriented vertically,
Since the second fixed blade 6B is arranged between the first fixed blades 6A and 6A, the runner is blocked by the second fixed blade 6B and cannot pass through the first fixed blades 6A and 6A as it is. That is, the runner collides with the second fixed blade 6B and lies on the fixed blade 6, and as described above, the runner is sandwiched by the shearing portions 56 of the fixed blade 6 and the rotary blade 5 and sheared. In this way, the runner is reliably sheared and prevented from falling down as it is.

In this case, since the fixed blades 6 made up of the first fixed blade 6A and the second fixed blade 6B are arranged on the inner surfaces of the hopper 3 which face each other, the non-crushed side of the runner, that is, FIG. Even if the runner falls on the left fixed blade 6 in, the runner is blocked by the first fixed blade 6A and the second fixed blade 6B and does not pass between them, similarly to the crushing side of the runner. Then, the runner falling on the side that is not crushed and positioned on the fixed blade 6 is lifted by the shearing portion 56 by the rotation of the rotary blade 5 and moves 180 degrees to the crusher side of the runner, and finally fixed. It is sandwiched between the blade 6 and the rotary blade 5 and sheared.

In this embodiment, the disk-shaped steel material Z
The first rotary blades 5A, 5A and the second rotary blade 5B were carved out from the above to form the rotary blade 5, but the first rotary blade 5A and the second rotary blade 5B were manufactured from different steel materials, respectively. 1 rotary blade 5A and 2nd rotary blade 5B are laminated to form rotary blade 5
Can also be configured.

The shearing portion 56 formed on the rotary blade 5 does not necessarily have to have an arc shape, and may have a straight line. Further, without forming the string 51, the disk-shaped steel material Z
It is also possible to form the concave portion 53 while leaving the circumferential surface of No. 3 as it is.

The inclined blade surface 55 formed on the rotary blade 5
Is not limited to three 120-degree cycles, but may be two 180-degree cycles or four 90-degree cycles.

[0025]

As described above, according to the present invention, the rotary blade of the runner crusher is provided with a plurality of concave portions each having an inclined blade surface, an inclined surface, and a shearing portion connecting the inclined blade surface and the inclined surface. And a second rotary blade that has a concave portion that is sandwiched on both sides by the first rotary blade and that overlaps with the concave portion of the first rotary blade, and that has a smaller rotation radius than the first rotary blade. In addition, the fixed blade is a first fixed blade which is arranged close to the side surface of the first rotary blade, and a second fixed blade which is arranged close to the peripheral surface of the first rotary blade so as to face the second rotary blade. With this configuration, the runner is prevented from passing without being sheared even if it falls in any posture, and the runner is sandwiched between the shearing part of the rotary blade and the fixed blade to securely shear the runner. You can

[Brief description of drawings]

FIG. 1 is a plan view showing an overall configuration of a runner crusher of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

3 is a cross-sectional view taken along line YY of FIG.

FIG. 4 is a perspective view showing a rotary blade.

FIG. 5 is a side view illustrating a procedure for forming a rotary blade.

FIG. 6 is an explanatory view showing a crushed state of a runner by a conventional runner crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 runner crusher 3 hopper 4 rotary shaft 5 rotary blade 5A first rotary blade 5B second rotary blade 53 concave portion 54 inclined blade surface 55 inclined surface 56 shearing portion 6 fixed blade 6A first fixed blade 6B second fixed blade 7 drive apparatus

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Claims (1)

[Claims] 1. A rotary shaft rotatably supported by a hopper via a drive device, a plurality of rotary blades fixed to the rotary shaft at intervals, and a plurality of rotary blades fixed to an inner surface of the hopper. A first rotary blade having a plurality of concave portions each including a fixed blade, a tilted blade surface, a tilted surface, and a shearing portion connecting the tilted blade surface and the tilted surface, and the first rotary blade. The blade is clamped on both sides, has a concave portion that overlaps with the concave portion of the first rotary blade, and is composed of a second rotary blade formed with a radius of rotation smaller than the radius of rotation of the first rotary blade.
The fixed blade is a first rotary blade that is disposed close to the side surface of the first rotary blade.
A runner crusher comprising a fixed blade and a second fixed blade which is arranged so as to face the second rotary blade and be close to the peripheral surface thereof.