JP3380779B2 - Strand takeover switching 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 strand take-off switching device used in a pellet cutting type pellet manufacturing apparatus.

[0002]

2. Description of the Related Art A conventional strand cutting type pellet manufacturing apparatus will be described.

(A) As shown in FIG. 10, the extruder 101
The plastic is plasticized by, and the strands 107 are extruded from a plurality of orifices arranged in an example at intervals in the direction perpendicular to the paper surface provided in the die 102, and the extruded plurality of strands 107 are cooled through a cooling water tank 103. After being solidified, the guide roll 10
A pellet cutting type pellet manufacturing apparatus configured to be introduced into the strand cutting apparatus 104 via 5 and sequentially cut into pellets by the rotary blade 106.

(B) As shown in FIG.
The movable segment 2 is provided with an inclined trough 205 for guiding the more extruded strand 207 to the cutting device 206 and a movable segment 203 arranged between the nozzle 201 and the trough 205 and movable in the arrow direction.
When 03 is moved to the lower part of the nozzle 201, the strand 207 which is being dripped by the removal blade 202 pivotally mounted on the support 208 standing on the movable segment 203 is cut and separated, and then the movable segment 2 is moved.
03 strands 207 extruded onto the slot 20
4 pellet manufacturing apparatus configured strand cutting method to direct the trough 205 by the cooling water is discharged towards the trough 205 (see JP-equitable 5-10203).

[0005]

Among the above-mentioned conventional techniques, in (a), the extruded strand is dripped out of the machine from the start of the extruder until the discharge amount is stabilized, and the discharge amount is stabilized. At this point, the part of the strand that has drifted off is cut off and the newly extruded strand is guided to the strand cooling tank during the initial switching work, and vice versa. All the switching work must be done manually, and there is a problem that troubles such as strands crossing each other during the work are likely to occur.

On the other hand, (b) is an initial switching operation in which the strand is dripped until the discharge amount of the extruder becomes stable, and then the drooped portion of the strand is cut off to introduce the newly extruded strand to the trough. However, there is a problem in that it is not possible to switch from the steady operation to the running of the strand.

The present invention has been made in view of the problems of the above-mentioned prior art, and is not limited to the initial switching work of introducing the strand from the drooling to the cooling and drawing device.
It is an object of the present invention to realize a high-performance strand take-off switching device that can automatically perform a switching operation from steady operation to drooling.

[0008]

To achieve the above object, a strand take-off switching device of the present invention comprises a pair of guide rails arranged between a die for extruding a strand and a strand cooling tank for cooling the strand. A pallet-shaped chute that is reciprocally movable along the guide rails, and a linear drive means that moves the chute reciprocally.
Width protruding from the surface of the chute facing the die
Direction, and the outer peripheral surface slides on the upper surface of the frame-shaped portion.
A cutter holder that is rotatably supported so as to movably contact it, and radially protrudes in the cutter holder in mutually opposite directions.
And the first and second blades arranged so as to move the cutter holder with the reciprocating movement of the chute .
First rotational position and the the blade toward the die side of the
A second second kick plate projecting from the said cutter holder for rotating alternately to the rotational position of the blade toward the die side, the mosquito Ttahoruda is, the rotation of the first and the second ejection of the flow channel provided in the frame-like portion at a position
It is characterized in that it is provided with first and second notches for alternately discharging the cooling water from the outlet in opposite directions.

A stopper may be provided for temporarily fixing the cutter holder at each of the first and second rotational positions.

A coil spring may be provided to urge the first and second blades radially outward of the cutter holder.

[0011]

Operation: From the start of the extruder until the discharge amount becomes stable, the chute is kept at the position where it is pulled up to the upper end along the guide rails, and the strands extruded from the die flow down to the chute. At this time, the cutter holder is at the first rotation position with the first blade facing the die, and the cooling water in the flow path of the frame portion of the chute is discharged downward from the first cutout portion, and the strand runoff portion. To cool immediately.

When the discharge amount becomes stable, the chute is lowered by driving the fluid pressure cylinder, and in this step, the strand is cut near the nozzle of the die by the first blade. The strands that are subsequently extruded are introduced into a strand cooling tank, dive below the liquid surface, cooled, and then cut into pellets.

On the other hand, in the process of the chute descending along the guide rail, the kick plate engages with the protrusion provided on the lower portion of the guide rail, whereby the cutter holder is rotated and the second position is set in the second rotation position. At the same time that the blade is directed to the die side, the cooling water in the flow path of the frame-shaped portion is discharged upward from the second cutout portion of the cutter holder.

When switching from the steady operation of pushing the strands from the extruder to the strand cooling tank to the state where the strands run down the chute, the strands are moved by the second blade in the process of driving the fluid pressure cylinder in the reverse direction to raise the chute. Disconnect.

At this time, the cooling water discharged upward from the second notch of the cutter holder efficiently cools the rear end of the cut strand, and the semi-molten strand adheres to the upper end of the chute. Trouble can be prevented.

In the process of further raising the chute, the kick plate engages with the projection on the upper portion of the guide rail, whereby the cutter holder is rotated to the first rotation position and returns to the above-mentioned initial state.

Not only the initial switching work by lowering the chute but also the switching work for switching from the steady operation to the drooping can be performed extremely efficiently and automatically.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a die 2 is attached to the discharge side of the extruder 1, and below the die 2,
A strand cooling tank 30 for cooling the strands S extruded from the die 2 is provided, and a cutting device (not shown) similar to the conventional example is provided further downstream thereof.

The die 2 is provided with a plurality of nozzles 2a which are formed in a row in the direction perpendicular to the plane of the drawing at intervals from each other, and a plurality of strands S can be extruded in a row at intervals.

The strand cooling tank 30 has a box-like shape with an open upper surface capable of filling a predetermined liquid level with cooling water, and one end side in the longitudinal direction thereof is positioned below the die 2. It is arranged.

In the strand cooling tank 30, the strand S
A plurality of guide rolls for diving in a state in which the strands S are arranged at the outlet side of the strand cooling tank 30.
There is provided a strand take-up device including a take-up roll mechanism or the like that pulls up the liquid on the liquid surface and sends it to a cutting device (not shown).

The production of pellets is continued by diving the strands aligned in a line through a predetermined take-up path defined by the guide roll and take-up roll mechanism, cooling them, and then guiding the strands to a cutting device to cut each strand into pellets. However, since the discharge amount is not stable immediately after starting the extruder, until the discharge amount is stable,
The extruded strands flow out of the machine. When the discharge amount becomes stable, the portion of the strand that has flowed off is cut, and switching is performed to guide the newly extruded strand to the strand cooling tank.

In order to automatically perform this initial switching work, the following chute 3 and cutter holder 4 for drainage are provided.
A strand switching mechanism is provided.

As shown in FIGS. 2 to 4, the pallet-shaped chute 3 has a plurality of arms 14 projecting from both sides.
Each of which has a roller 13 rotatably supported at its tip, and a groove portion on the outer periphery of each roller 13 is engaged with a guide portion 7b of a pair of guide rails 7a integrally provided on both sides of the support frame 7. The rod 8a of the fluid pressure cylinder 8 which is a linear drive means is connected to the upper end of the rod 8a.

The chute 3 is provided with a bottom plate 3a and a pair of side frames 3b projecting toward the dice side at both side edges of the bottom plate 3a. A frame-shaped portion 9 is provided so as to extend in the arrangement direction of the nozzles 2a). The frame-shaped portion 9 has a substantially trapezoidal cross-sectional shape and has a channel 9a inside. A slit-shaped discharge port 9b communicating with the flow path 9a is opened on the upper surface of the frame-shaped portion 9 which is an arcuate concave surface. The flow path 9a provided in the frame-shaped portion 9 is connected to the water supply pipe 10 via the joint 10a.

Bearings 11 are arranged outside both end portions of the frame-shaped portion 9 of the chute 3, and the shaft portions 12 projecting from both end portions of the cutter holder 4 are rotatably supported by the bearings 11. There is. The cutter holder 4 is a columnar member formed by combining a pair of semi-cylindrical halves, and has first and second protrusions radially opposite to each other in a mounting groove formed on a mating surface. Two blades 5a and 5b are arranged slidably in the radial direction. This pair of blades 5a, 5b
Is constantly urged outward in the radial direction by a coil spring 6 provided in a space inside the cutter holder 4.
The outer peripheral surface of one half of the cutter holder 4 is slidably abutted on the upper surface of the frame-shaped portion 9, and in the axial direction of a shape in which both sides of the cutter holder 4 are cut out in a substantially C-shape leaving the central portion. First and second extending notches 4a and 4b are provided.

At both ends of the cutter holder 4, there are first and second
Are provided, which engage with the stopper 11a of the bearing 11 when the cutter holder 4 rotates to the first and second rotational positions, and temporarily fix the cutter holder 4 at each rotational position. (See Figure 2).

FIG. 5 shows a state in which the chute 3 is pulled up to the uppermost position by pulling in the rod 8a of the fluid pressure cylinder 8. In this state, the cutter holder 4
The kick plate 16 projecting from the abutment abuts the protrusion 15a on the upper portion of the guide rail 7a, the cutter holder 4 is rotated clockwise in the drawing, and the second blade 5b abuts the upper side surface of the frame-shaped portion 9 and the The one notch 4a faces the discharge port 9b of the flow path 9a, so that the discharge port 9b opens downward in the drawing. In such a first rotation position of the cutter holder 4, the cooling water supplied through the flow path 9a flows down the chute 3 as shown by the arrow. Therefore, the strand S extruded from the nozzle 2a is guided by the chute 3 and cooled by the cooling water, and the strand cooling tank 30
Is spilled to the outside of.

From the above-mentioned position shown in FIG. 5 to that shown in FIG.
To project the rod 8a of the fluid pressure cylinder 8
When the chute 3 is linearly moved downward,
The edge of the first blade 5a of the cutter holder 4 discharges the die 2.
By contacting the side surface 2b, elastic force of the coil spring 6
Slides while being pressed against the discharge side surface 2b,
The strand S extruded from 2a is cut. to this
Then, as shown in FIG. 7, the shoot 3 linearly moves downward.
Part S of the cut and cut strand ₁ Strike
It is discharged to the outside of the land cooling tank 30.

Following the state of FIG. 7 described above, the shoot 3
8 is lowered to the lowermost position shown in FIG. 8, the kick plate 16 projecting from the cutter holder 4 is guided by the guide rail 7a.
When the first blade 5a contacts the lower side surface of the frame-shaped portion 9, the second cutout portion 4b contacts the discharge port 9b of the flow path 9a. opposite. In such a second rotation position of the cutter holder 4, the discharge port 9b opens upward in the drawing, and the flow path 9b is opened.
The cooling water supplied from a is in a state of flowing out toward the upper side of the frame-shaped portion 9.

On the other hand, the strand S extruded from the nozzle 2a hangs down to the introduction part of the strand take-up device in the strand cooling tank 30, and the steady operation is started.

FIG. 9 shows the operation of switching from the steady operation to the drooling, contrary to the above. When the rod 8a of the fluid pressure cylinder 8 is pulled in from the state of FIG. 8 to raise the chute 3, the second blade 5b is moved. Moves in a state where the edge thereof is pressed against the discharge side surface 2b of the die 2, and cuts the strand S at the nozzle 2a. Cut strand S
Although the rear end is in a semi-molten state, it does not adhere to the upper end of the chute 3 because it is immediately cooled by the cooling water flowing out from the flow path 9a toward the upper side of the frame-shaped portion 9. The chute 3 continues to rise, and the strands extruded from the die 2 thereafter are dripped onto the chute 3.

When the kick plate 16 engages with the upper protrusion 15a and rotates the cutter holder 4 in the clockwise direction while the chute 3 continues to rise, it returns to the initial state shown in FIG. 5 to cool the flow passage 9a. Water flows downwards, cooling the strands of drool.

In this way, the shoot 3 for running away
The cutter holder 4 is rotated by the kick plate 16 in the process of moving the blade up and down, and the two blades 5 held by the cutter holder 4 are moved.
The strand S can be automatically cut by alternately using a and 5b.

Between the strand cooling tank and the die of the extruder, the switching from the initial runoff of the strands to the steady operation is automatically performed without causing trouble such as crossing of strands, and from the steady run to the runoff. Since it is possible to freely switch between, the productivity of the pellet manufacturing apparatus can be greatly improved.

[0037]

Since the present invention is configured as described above, it has the following effects.

From the step of dropping the strands extruded from the die of the extruder to the chute, the initial switching work of guiding the strands to the strand cooling tank and switching to the steady operation can be automatically and efficiently performed.

Further, the work of switching from the steady operation to the running-down process can be automatically performed only by moving the chute in the opposite direction to the initial switching work, and the rear end of the semi-molten strand is attached to the chute. You can avoid trouble.

By using such a strand take-off switching device, it is possible to realize a pellet manufacturing device with extremely high productivity.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of a strand take-off switching device according to an embodiment.

FIG. 2 is a partial explanatory view of the strand switching mechanism in the apparatus of FIG. 1 viewed from the die side.

FIG. 3 is a schematic partial cross-sectional view taken along the line AA of FIG.

FIG. 4 is a schematic partial cross-sectional view taken along the line BB of FIG.

FIG. 5 is an explanatory view showing the strand running-off in the strand switching mechanism shown in FIG.

FIG. 6 is an explanatory diagram showing immediately before the strand running-off shown in FIG. 5 is finished and the strand is cut.

FIG. 7 is an explanatory view showing immediately after the strand running-off shown in FIG. 5 is finished and the strand is cut.

FIG. 8 is an explanatory diagram showing a state in which a strand is introduced into a cooling tank.

FIG. 9 is an explanatory diagram showing a state immediately after cutting a strand in a state of being introduced into a cooling tank.

FIG. 10 is a diagram showing an example of a pellet manufacturing apparatus.

FIG. 11 is a diagram showing another example of a pellet manufacturing apparatus.

[Explanation of symbols]

1 extruder 2 dice 2a nozzle 3 shoots 4 cutter holder 4a first notch 4b second notch 5a first blade 5b second blade 6 coil spring 7 Support frame 7a Guide rail 8 Fluid pressure cylinder 8a rod 9 Frame-shaped part 9a channel 9b outlet 10 Water pipe 11 bearings 11a stopper 12 Shaft 13 roller 14 arms 15a, 15b protrusion 16 kick plate 30 strand cooling tank

Continuation of the front page (56) Reference JP-A-9-141651 (JP, A) JP-A-11-141651 (JP, A) JP-A-54-52165 (JP, A) JP-A-61-123504 (JP , A) JP 1-135620 (JP, A) JP 6-143256 (JP, A) JP 9-155859 (JP, A) JP 10-264236 (JP, A) JP 11-123716 (JP, A) Actual development Sho 61-53118 (JP, U) Registered utility model 3046333 (JP, U) Special table 6-502359 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 47/00-47/96 B29B 9/00-9/16

Claims (3)

(57) [Claims] 1. A pair of guide rails (7a) arranged between a die (2) for extruding a strand (S) and a strand cooling tank (30) for cooling the strand.
A pallet-shaped chute (3) reciprocally movable along the guide rail, a linear driving means (8) for reciprocating the chute, and a pair of dies for the chute .
A frame-shaped portion (9) extending in the width direction, which is provided so as to project on the facing surface.
So that the outer peripheral surface slidably contacts the upper surface of the frame-shaped portion.
Arranged such that the rotatably supported by the cutter holder (4), protruding in opposite directions from each other in the radial direction to the cutter holder in
Has been first and second blades (5a, 5b) and said first and said cutter holder is accompanied with the reciprocating movement of the chute
First rotational position and the the blade toward the die side of the
A second blade having said cutter holder projecting from the kick plate (16) for rotating alternately in a second rotational position towards the die side, the mosquito Ttahoruda is the first and the second The first and second cutouts for alternately discharging the cooling water in the opposite directions from the discharge port (9b) of the flow path (9a) provided in the frame-shaped portion at the second rotation position ( 4a, 4
b) A strand take-off switching device comprising: 2. A stopper (11a) for temporarily fixing the cutter holder in each of the first and second rotational positions is provided.
Strand take-off switching device described. 3. The strand take-off switching according to claim 1 or 2, further comprising a coil spring (6) for urging the first and second blades radially outward of the cutter holder. apparatus.