JP2001088124A - Apparatus for cooling and taking off strand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate the initial operation for taking off strands, just after startup of an extruder. SOLUTION: The fore end parts of strands S extruded in a row from a die 2 of an extruder 1 of pellet manufacturing equipment are held by paired handling bars 73 and 75 of a chucking means 70 and passed through cooling water of a strand cooling bath 10 along a guiding track 50 constituting a cam track, so as to be cooled. Then, the strands S are released by opening the handling bars 73 and 75 of the chucking means 70 on the downstream side of a take-off roll mechanism 30 composed of a lower roll 31 and an upper roll 35. The strands S after the release are introduced into a cutting device not shown in the Figure, being fed by the take-off roll mechanism 30, and are cut into pellets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strand cooling and taking-off device used in a pellet cutting device by a strand cutting method.

[0002]

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

(A) As shown in FIG. 8, a plastic is plasticized by an extruder 101, and a plurality of orifices arranged in an example at a distance from each other in a direction perpendicular to the paper surface provided on a die 102 are used as strands 107. And a plurality of extruded strands 107 are cooled in the cooling water tank 1.
03 and solidified by cooling, the guide roll 105
To the strand cutting device 104 through the rotary blade 1
06. A strand cut type pellet manufacturing apparatus configured to sequentially cut into pellets according to 06.

(B) As shown in FIG. 9, an inclined trough 205 for guiding a strand 207 extruded from a nozzle 201 to a cutting device 206 and a movement in an arrow direction provided between the nozzle 201 and the trough 205 Said movable segment 20 comprising a freely movable segment 203;
3 is moved to a position below the nozzle 201, the strand 207 drooling down by the removing blade 202 pivotally attached to the support 208 erected on the movable segment 203 is cut and separated, and then the movable segment 20 is moved.
3. The strand 207 extruded onto the
Strand cut type pellet manufacturing apparatus configured to guide cooling water to the trough 205 by cooling water discharged toward the trough 205 (see JP-A-5-10203).

[0005]

Among the above-mentioned prior arts, (a) is that a plurality of extruded strands are dripped out of the extruder from the start of the extruder until the discharge amount is stabilized, and the discharge amount is reduced. At the time when the stabilization was performed, the operator had to manually perform an initial take-off operation to cut off the run-off portion of the strand and to take out a plurality of newly extruded strands through the cooling water tank to the cutting device. . If the strand take-up speed becomes uneven in the initial take-up operation, the strand may be locally cooled to bend or vary in thickness, and the take-off by the cutting device may be troublesome. In addition, when the operator takes over the strand, the strands cross each other, and if this crossed portion is caught by the take-up roll of the cutting device, the take-up of the other strands stops for a moment and accumulates in the water tank, forcing a restart. There is a problem that.

On the other hand, the method (b) cools the strand for a short time and cools the strand sufficiently after cutting it into pellets, which is effective for plastics having a low viscosity and relatively high thermal conductivity such as polyester and polycarbonate. However, it cannot be used for plastics having high viscosity and relatively low thermal conductivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and automatically performs an initial take-off operation for guiding a tip end of a strand extruded from a die to a cutting device through a strand cooling bath. Can do it,
It is an object of the present invention to provide a high-performance strand cooling and take-off device having general versatility applicable to a wide range of resin types.

[0008]

In order to achieve the above object, a strand cooling and take-off device according to the present invention comprises: a strand cooling tank for cooling a strand extruded from a die; and a strand in the strand cooling tank. A strand take-off guide means for continuously moving the strands along a predetermined take-up path, and a chucking means capable of holding and releasing the strand between a pair of handling bars,
A guide track for guiding the chucking means along the take-off path in the strand cooling tank, and an endless drive means for continuously moving the chucking means along the guide track; The guide track includes a pair of guide rails, and the pair of guide rails cause the pair of handling bars of the chucking means to be held and released with respect to the strand while moving along the take-off path. A cam track for the motor.

[0009] It is preferable that the chucking means hold the strand above the liquid surface of the strand cooling bath, maintain the state where the strand is held below the liquid surface, and open the strand when it comes above the liquid surface.

A chucking means for supporting a pair of handling bars via respective rotating arms;
It is preferable that a biasing means for biasing the pair of handling bars to an open state is provided.

[0011]

[Action] In the initial stage of the pellet manufacturing process in which the strands extruded in a row from the die are immersed in a strand cooling tank, cooled, and guided to a cutting device to produce pellets.
During the period from the start of the extruder until the discharge amount is stabilized, the extruded strand is dripped out of the machine.When the discharge amount is stabilized, the dripped part is cut off, and the newly extruded strand is removed. It leads to a cutting device through a strand cooling bath.

[0012] In the strand cutting method for continuously cooling the strand and taking it to the cutting device in this manner, in the initial take-up operation of the strand, that is, after cutting off the dripped part of the strand, the leading end is placed in the strand cooling tank. To automate the process of picking up
Above the liquid level of the strand cooling tank, the tip of the strand is pinched by the chucking means and pulled below the liquid level,
By moving the chucking means along the guide trajectory, an initial take-off mechanism is provided for leading the take-up path along the strand take-up guide means such as a guide roll below the liquid level.

The guide track has a pair of guide rails for bringing a pair of handling bars of the chucking means into contact with each other, and the chucking means continuously driven by an endless driving means such as an endless chain includes the guide roll or the like. Along with the cam path for holding and releasing the strands while moving both handling bars.Specifically, when the distance between the two guide rails is reduced, handling is performed. The bar clamps the strand, and the handling bar is configured to open the strand when the distance increases.

By sandwiching the strands arranged in a line between a pair of handling bars and submerging in the strand cooling bath, the initial take-off can be automatically performed without the strands getting caught or crossed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, on the discharge side of the extruder 1, a die 2 having a plurality of nozzles 2a arranged in a line at a distance from each other in a direction perpendicular to the paper surface is attached. The discharge side surface 2b where the nozzle 2a of the die 2 opens is inclined obliquely downward with respect to the extruder 1, and a plurality of strands S arranged in a line at a distance from each other in a direction perpendicular to the paper surface. It is configured to be pushed downward.

The strand cooling tank 10 has a box-like shape with an open upper surface capable of filling cooling water to a predetermined liquid level, and has one longitudinal end located below the die 2. It is disposed on a base 11, and a water supply / drain port 13a is provided on a bottom wall 10a. The water supply / drain port 13a always supplies water during normal operation to be described later, and the overflow drain port 13a provided on the downstream side.
The liquid level of the strand cooling tank 10 is maintained by overflowing the heated cooling water from b. When draining for maintenance or the like, it is used as a drain port.

The strand cooling tank 10 contains a strand S
Rolls 21, 22, 23, which are strand take-off guide means for dive in a state in which the strands S are lined up in a line, and a take-up roll mechanism for pulling up the strand S on the liquid surface at the outlet side of the strand cooling tank 10 and sending it to a cutting device (not shown) 30 are provided.

In the production of the pellets by the normal operation, the strands S arranged in a line are immersed in a predetermined take-up path defined by the guide rolls 21, 22, 23 and the take-up roll mechanism 30, cooled, and then led to a cutting device (not shown). This is performed continuously by cutting each strand S into pellets, but in the initial take-off after the start of the extruder 1, the leading ends of the strands S arranged in a line are gripped and cooled along the take-off path. It is necessary to work underwater.

The following initial take-off mechanism is provided to automatically perform this initial take-up operation.

An endless guide track 50 composed of an inner guide rail 51 and an outer guide rail 52 surrounding the inner guide rail 51 at a predetermined interval is provided along both longitudinal side walls 10b of the strand cooling bath 10. Arrange.

Since the guide tracks 50 on both sides are the same, the following description will focus on one guide track 50.

In the guide track 50, the introduction part 50a below the die 2 is located above the liquid level 12, and the introduction part 50a
A dive portion extending from the dive portion to the downstream side by diving into the cooling water; a downstream portion protruding above the liquid level 12 from the dive portion and reaching the folded portion 50b substantially in parallel with the liquid surface 12;
The return part returns from b to the introduction part 50a.

The endless chain 53, which is an endless driving means provided with a chucking means 70 described later, is driven sprocket 54 and idle sprocket 55 so that the endless track follows the inner guide rail 51 of the guide track 50. , 58 and a tension sprocket 59.

As shown in FIG.
A supporting shaft 71 supported by a connecting member 76 connected to an appropriate portion of the endless chain 53 on both sides;
1, one handling bar 73 provided integrally with the free end of one rotating arm 72 rotatably provided via a cylindrical fitting portion 72a, and a cylindrical fitting portion provided on a support shaft 71. 7
The other rotating arm 7 rotatably provided via 4a
4 includes a second handling bar 75 integrally provided at a free end of the first arm 4 and rollers (cam followers) 78 rotatably provided at both side ends of the two handling bars 73 and 75. The coils 72, 74 are constantly urged by the coil spring 77, which is urging means disposed near both end portions of the support shaft 71, so that the coil spring 77 is opened (opened) around the support shaft 71.

For this reason, the chucking means 70 travels along the guide track 50 integrally with the endless chain 53, and on the opposing surface of the inner guide rail 51 and the outer guide rail 52,
The vehicle runs in a state in which rollers 78 rotatably provided at both ends of both handling bars 73 and 75 are always in contact with each other.

The inner guide rail 51 and the outer guide rail 52 of the guide track 50 constitute a cam track for holding and releasing the handling bars 73 and 75 with respect to the strand S. That is, the inner guide rail 51
In the diving section where the distance between the outer guide rail 52 and the outer guide rail 52 is set to be small (narrow) and in the downstream part which protrudes upward from the diving section and rises substantially parallel to the liquid surface 12 to the turn-back portion 50b, both handling bars 73 are provided. , 75 approach each other (close) to clamp the tip of the strand S. Further, in the return section which returns to the introduction section 50a from the introduction section 50a and the return section 50b in which the distance between the inner guide rail 51 and the outer guide rail 52 is set to be wide, the handling bars 73 and 75 are separated from each other and the strands are separated. S is kept open to release S.

As shown in FIG. 1 and FIG.
The lower roll 31 of the take-up roll mechanism 30 is disposed below the guide track 50 in the downstream portion of the guide track 50 substantially parallel to the liquid surface 12 at 0 and reaching the folded portion 50b. The lower roll 31 has a shaft portion 32 rotatably supported on a side wall 10 b via a bearing 33, and a pulley 34 attached to one end of the shaft portion 32 and a motor disposed on the base 11. 4
It is configured to be rotationally driven in the direction of the arrow via the belt 39 wrapped around the zero drive side pulley 41.

The lower roll 31 has an outer peripheral surface roughened by knurling or the like to increase the frictional force with the strand S, thereby improving the take-up ability of the strand S.

The upper roll 35 composed of a rubber roll or the like of the take-up roll mechanism 30 is connected to a rod 38 of a hydraulic cylinder 38.
The upper roll 35 is rotatably disposed via a bearing 37 on a shaft 36 fixed to the end of the lower roll 31 by extending and contracting a rod 38a of a fluid pressure cylinder 38.
It is configured to be able to approach and separate from.

As shown in FIGS. 1 and 3, the driving sprocket 54 is provided integrally with a rotating shaft 64 rotatably supported via a bearing 14 at a position near the introduction portion 50a of the side wall 10b. The rotating shaft 64 is rotated in a direction indicated by an arrow via a belt 62 wound around a pulley 63 attached to one end of a rotating shaft 64 and a driving pulley 61 of a motor 60 provided on the base 11.

As shown in FIGS. 1 and 4, the side wall 10b
In the part near the bent part in the diving part of the guide track 50 of
The shaft 66 is fixed, and the idle sprocket 55 is rotatably disposed on the side wall 10b side of the shaft 66 via a bearing 55a, and the guide roll 22 is rotatably disposed on the inner side thereof via a bearing 65a. Has been established.

The initial take-off operation of the strand cooling / taking-up device according to the present embodiment will be described.

(1) As shown in FIG. 1, the strand S extruded from the nozzle 2a of the die 2 is dripped until the discharge amount of the extruder 1 is stabilized, and the dripped portion is cut off. Subsequently, the strand S is extruded from the nozzle 2a of the die 2. When the optical sensor 20 detects that the leading end of the strand S hangs down to the introduction portion 50a of the guide track 50, the motor 60 is activated and the endless chain 53 travels in the direction indicated by the white arrow, and together with this, near the introduction portion 50a. The waiting chucking means 70 is
The vehicle travels toward the cooling water ahead of the tip of the strand S.

The timing for starting the motor 60 is as follows.
The chucking means 70 precedes the tip of the strand S extruded from the nozzle 2a, so that the tip of the strand S hangs between the handling bars 73 and 75 which are opened at the maximum opening.

(2) After the above (1), the chucking means 70 travels to the diving part of the guide track 50. Here, since the interval between the inner guide rail 51 and the outer guide rail 52 is small, FIG. As shown in FIG. 6, both handling bars 73 and 75 are closed, and the leading end of the strand S is clamped.

In this case, both handling bars 73 and 75 are held in a state where the tip end of the strand S hangs down in the cooling water.
Are closed, and the strand S is sandwiched, so that the strands S are not entangled and are kept in a state where they are pushed out of the plurality of nozzles 2a in a line at intervals.

(3) After the above (2), the chucking means 70 sandwiches the leading end of the strand S between the handling bars 73 and 75 and guides the strand S below the liquid surface, and travels on the diving part of the guide track 50. Then, the rear strand S is guided by the guide rolls 21 and 22, travels in the cooling water, and is cooled.

(4) After the above (3), the chucking means 70 moves the idle sprocket 56 disposed immediately before the lower roll 31 while holding the tip end of the strand S.
And travels toward the turn-back portion 50b at the position indicated by the arrow, the strand S is also guided by the guide roll 23 rotatably provided on the same axis as the idle sprocket 56, and 12 and roll down 3
1 pass above.

(5) After the above (4), when the chucking means 70 passes above the lower roll 31, the fluid pressure cylinder 38 moves the rod 38a in time.
, The upper roll 35 descends toward the lower roll 31, and the strand S traveling on the lower roll 31 is pinched.

The lower roll 31 and the upper roll 3
5 is set slightly lower than the traveling speed of the chucking means 70.

(6) After the above (5), immediately before the chucking means 70 reaches the folded portion 50b of the guide track 50 and the both handling bars 73, 75 are opened, the two handling bars 73, 75 of the strand S are moved to the two handling bars 73, 75. A pulling force acts between the pinched portion and the portion pinched by the lower roll 31 and the upper roll 35, and as shown in FIG. The tip of S is smoothly separated. After that, the strand S is sent to a cutting device (not shown) only by the pulling action of the lower roll 31 and the upper roll 35.

(7) After the above (6), the chucking means 70 is returned from the folded portion 50b of the guide track 50 to the vicinity of the introduction portion 50a via the return portion and stopped, and the strand at the time of the next restart is restarted. It is prepared for the initial pick-up work of S.

[0044]

Since the present invention is configured as described above, the following effects can be obtained.

An initial take-off operation in which the tips of a plurality of strands extruded in a line at an interval from a nozzle of a die to a cutting device through cooling water is automatically performed without entanglement or crossing of the strands. Can do it.

There is no trouble as in the case of initial pick-up by hand, the productivity of the apparatus can be greatly improved, and the versatility is not limited to the type of resin.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of a strand cooling and taking-off device according to an embodiment.

FIG. 2 is an explanatory view of a chucking means in the strand cooling and taking-off device shown in FIG.

FIG. 3 is a schematic partial sectional view taken along line AA of FIG. 1;

FIG. 4 is a schematic partial sectional view taken along the line BB of FIG. 1;

FIG. 5 is a schematic partial sectional view taken along the line CC of FIG. 1;

FIG. 6 shows a strand cooling and take-off device shown in FIG.
FIG. 4 is an explanatory diagram showing a state in which the tip of a strand is sandwiched by chucking means.

FIG. 7 In the strand cooling and take-off device shown in FIG.
It is explanatory drawing which shows the state which the front-end | tip part of the strand detached from the chucking means.

FIG. 8 is an explanatory view showing an example of a conventional strand cut type pellet manufacturing apparatus.

FIG. 9 is an explanatory diagram showing another example of a conventional strand cut type pellet manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2 Die 2a Nozzle 10 Strand cooling tank 10a Bottom wall 10b Side wall 11 Base 12 Liquid level 13a Water supply / drainage port 13b Overflow drainage port 14, 33, 37, 55a, 65a, 67a Bearing 20 Optical sensor 21, 22, 23 Guide Roll 31 Lower roll 32 Shaft 34, 63 Pulley 35 Upper roll 36, 66 Shaft 38 Fluid pressure cylinder 38a Rod 39, 62 Belt 40, 60 Motor 41, 61 Driving pulley 50 Guide track 50a Introducing section 50b Folding section 51 Inner guide Rail 52 Outer guide rail 53 Endless chain 54 Driving sprocket 55-58 Idle sprocket 59 Tension sprocket 70 Chucking means 71 Support shaft 72, 74 Rotating arm 73, 75 Handling bar 76 Connecting member 7 Coil spring

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshito Tamaki 1-6-1, Funakoshi-minami, Aki-ku, Hiroshima-shi, Hiroshima F-term in Japan Steel Works, Ltd. (reference) 4F201 AC01 BA02 BA03 BC02 BC12 BC17 BC19 BL08 BL13 BL15 BL28 BQ38 BQ40 4F207 AC01 KA01 KA17 KK52 KK54 KW23 KW41

Claims (3)

[Claims] A strand cooling tank (10) for cooling a strand (S) extruded from a die (2).
A strand take-off guide means (21, 22, 23) for continuously moving the strands along a predetermined take-up path in the strand cooling tank; and a pair of handling bars (73, 75) A chucking means (70) that can be freely pinched and released between the two; a guide track (50) for guiding the chucking means along the take-off path in the strand cooling tank; Endless driving means (53) for continuously moving the chucking means, the guide track includes a pair of guide rails (51, 52), and the pair of guide rails While moving the pair of handling bars of the king means along the take-off path, a cam track for holding and releasing the strand is formed. Strand cooling puller, characterized in that form. 2. A structure in which the chucking means is configured to hold the strand on the liquid surface of the strand cooling tank, maintain the state of holding the strand below the liquid surface, and release the strand when it comes above the liquid surface. The strand cooling and take-off device according to claim 1, wherein 3. A chucking means for supporting a pair of handling bars via pivot arms (72, 74), respectively, and a supporting shaft (71) for urging the pair of handling bars to an open state. 3. Strand cooling and take-off device according to claim 1, comprising biasing means (77).