JPS6140762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a synthetic method in which cooling air is sent from one main duct or air blowing pipe to a plurality of spindles through branch pipes, respectively, in order to cool the spun yarn. The present invention relates to a melt-spinning apparatus for fiber yarns, particularly synthetic fiber yarns that blow cooling air from one direction and exhibit latent crimpability due to asymmetric cooling.

Generally, thermoplastic synthetic fiber yarns such as nylon and polyester are spun from the pack of a spinning device and cooled and solidified in a spinning tube, but a cooling device is installed at the top of the spinning tube to cool down the yarn immediately after spinning. (In some cases, there is only a cooling device and no spinning tube).

Many such cooling devices are used that blow out cooling air in a direction perpendicular to the direction in which the yarn flows. Conventionally, such devices have an open front system, so when the tension on the spun yarn is lost due to breakage of the spun yarn or yarn breakage due to abnormality detection, the cooling air is turned off. As a result, the threads may be blown to one side of the spinning tube or the cooling device, and may adhere and accumulate there and not fall downward, which has the disadvantage that subsequent removal work and threading become very troublesome.

In order to eliminate such drawbacks, a shutter is provided in the cooling air supply duct, and the shutter is linked with a yarn abnormality detection means, and when an abnormality occurs in the yarn, the shutter is closed and the air blowing to the spinning tube is stopped. A similar spinning device has been proposed (Jikko 52
−57213).

However, the above device is good if the cooling air generation (supply) device and the spinning tube are connected one-to-one via a duct, but two or more cooling devices (or spinning tubes, hereinafter referred to as It has been found that an apparatus in which the blower pipes are branched in response to the same problem and each of the branch pipes is connected to a cooling device causes the following problems and cannot achieve stable production.

In other words, for production or quality control reasons, it is necessary to maintain the cooling air volume to each cooling device so that the flow rate does not fluctuate over time and is almost constant at all times. Therefore, if the abnormality detection means is activated and automatically closes the shutter and stops the supply of cooling air to the cooling device, the air volume balance to other cooling devices will be disrupted due to the effect of this supply stop, and the flow rate will suddenly decrease. Changes to As a result, the quality or quality of the yarn obtained varies, and problems such as the generation of weak yarn due to cooling of the spinning cap surface and yarn breakage due to increased air flow are disadvantageous.

In addition, in order to eliminate the influence of such cooling air supply stoppage on other weights, it is extremely troublesome to adjust the opening degree of dampers or valves installed in each branch pipe to correct the air volume of other weights. Moreover, it is time-consuming, and
Even if the air volume is stable, if cooling air is again supplied to the weight after an abnormal interruption, the restart of the supply will affect the air volume of other weights, causing problems due to insufficient cooling air. In particular, the above-mentioned tendency becomes remarkable when latent crimpable synthetic fibers are produced by asymmetric quenching using a cooling fluid.

The present invention has been made in view of this problem, and provides a melt spinning device that does not affect other spindles even if the supply of cooling air to a spindle is interrupted due to yarn breakage or the like. be.

That is, the present invention provides a cooling device for blowing out cooling air for spun yarns at a position below the spinning pack corresponding to a spinning pack having a plurality of spindles, and a blowing pipe having a common supply source with each of the cooling devices. In a melt spinning apparatus in which a discharge pipe having an auxiliary damper for adjusting air volume is attached to the branch pipe or the cooling device, and a flow rate detector is installed in the branch pipe on the upstream side of the discharge pipe to detect the flow rate. The device and the auxiliary damper are interlocked, and a main damper is provided in the vicinity of the attachment part of the discharge pipe or on the upstream side thereof, and the main damper is interlocked with a yarn abnormality occurrence detection means arranged in the yarn travel path. , the main damper is activated to discharge cooling air from the discharge pipe when an abnormality occurs in the yarn.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a schematic view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a portion of the cooling device and flow rate detector portion of FIG. 1.

In the figure, reference numeral 1 indicates one of the spinning packs in which a plurality of spindles are arranged, and a cooling device located directly below the spinning pack 1 blows out cooling air in a direction substantially perpendicular to the direction of flow of the spun yarn Y. 2 is provided.

The cooling device 2 includes an air outlet 4 which is vertically divided into multiple stages by a fin 3, a guide plate 5 extending from both sides of the front surface of the air outlet 4, and a cooling air introduction chamber 6 formed at the rear of the fin. The introduction chamber 6 is provided with an introduction nozzle 7 and a discharge nozzle 8 for cooling air, and a main damper 9 for switching the flow path is installed between these nozzles 7 and 8. Rotation of the damper 9 causes the introduction nozzle 7 to The cooling air flow path from the fin 3
side and the discharge nozzle 8 side.

A rotation shaft 10 of the damper 9 is connected via an arm 12 to a hydraulic cylinder 11 that is activated by a signal from a thread breakage detector 19, which will be described later, so that the damper 9 is rotated by the operation of the cylinder 11. is being used.

13 is a focusing guide, 14 is an oiling device, 15 is a godet roller, and 16 is an aspirator.

17 is a winding device, which has a dancer roller 18 for adjusting the tension of the yarn Y;
The yarn Y is wound up through the . dancer roller 1
8 rotates vertically around a predetermined position A to adjust the thread tension, and when the thread tension disappears, it moves to the position shown in B. At this B position, a phototube or limit switch 19' Detector 19 like
is provided, and when a yarn breakage such as yarn breakage occurs, the dancer roller 18 moves downward and the detector 19 is activated. This detector 19 is linked to the hydraulic cylinder 11 via a controller 20, so that the cylinder 11 performs a predetermined operation based on the signal. 21 is a main duct connected to a supply source such as a blower (not shown), and the main duct 2
A branch pipe (or duct) 22 is provided which leads from the cooling device 1 of each weight to the cooling device 2 of each weight, and is connected to the introduction nozzle 7 of each cooling device 2. 23 is branch pipe 22
It is a damper or valve for adjusting the air volume. 24
is an auxiliary damper provided on the discharge nozzle 8, a worm gear 26 is attached to one end of the shaft 25, and an air motor 28 having a worm 27 that meshes with the worm gear 26 is disposed in correspondence with the worm gear 26. There is. Such driving is not limited to the air motor 28 and gears, but may also be a direct motor, a rack and pinion system, or other means (the same applies to the main damper 9). A conduit 29 for supplying compressed air is connected to the air motor 28, and the air motor 28 is driven and stopped by opening and closing a solenoid valve 30 provided in the conduit 29.

Reference numeral 31 denotes an orifice for detecting flow rate attached to the branch pipe 22, and the orifice 31 and the solenoid valve 3
0 is interlocked with the orifice 31 and the impulse pipe 32.
The differential pressure taken out from the differential pressure transmitter (not shown) enters the controller 20 in response to an electric signal, which issues an opening/closing signal to the solenoid valve 30 to operate it.
The yarn Y spun from the spinning pack 1 is rapidly cooled on one side by cooling air blown in one direction from the cooling device 2 installed directly below the spinning pack 1, and is given cross-sectional anisotropy. . Next, the asymmetrically cooled yarn Y is collected by a guide 13 and applied with spinning oil by an oiling device 14, and then passes through a godet roller 15 to a winding device 17, where it is engaged with a dancer roller 18. It moves vertically around position A and is wound up while adjusting the tension. In a normal state, the yarn Y is asymmetrically cooled by the cooling device 2 as described above, and is passed from the oiling device 14 to the godet roller 15 to the winding device 17.
At this point, the yarn Y is wound up, but if a yarn breakage occurs for some reason, the yarn Y being wound loses its tension, so the dancer roller 18 moves downward and hits the limit switch 19' at position B, causing the yarn to break. It emits a signal to let you know what has happened.

The main damper 9 disposed in the cooling device 2 is normally fixed at a lower position, the cooling air flow path is closed on the exhaust nozzle 8 side, and the cooling air is distributed from the introduction nozzle 7 to the fin 3 side. The fluid pressure cylinder 11 is actuated by the yarn breakage signal from the upper limit switch 19', and the main damper 9 is rotated upward as shown by the two-dot chain line. Therefore, the flow path of the cooling air is switched, and the cooling air that was being blown out from the blow-off port 4 is discharged to the outside from the discharge nozzle 8. Furthermore, the orifice 31 and the auxiliary damper 24 are activated by the thread breakage signal.
In other words, if the circuit with the solenoid valve 30 is connected (it may remain connected all the time), and the flow does not correspond to a predetermined flow rate, that is, if the flow rate changes, the solenoid valve 30 is activated to open it, and the compressed air is then closed. is supplied to the air motor 28, and the opening degree of the auxiliary damper 24 is automatically changed so as to return the flow rate to the pre-change flow rate. When the flow rate returns to the predetermined flow rate, the solenoid valve 30 is closed and the auxiliary damper 24 is maintained in this state. The solenoid valve 30 may be provided in the discharge conduit 29' instead of the supply conduit 29.

In this way, even if the cooling air flow path is switched to the discharge side by changing the opening degree of the main damper 9, the auxiliary damper 24 of the discharge nozzle 8 changes its opening degree so that there is no change in the flow rate detected by the orifice 31. The flow rate hardly changes, and the interruption of cooling air to the cooling device 2 does not affect the cooling air volume of other spindles as in the conventional case, and troubles such as quality deterioration and thread breakage do not occur.

Here, it is not necessarily necessary to close the main damper 9 to the extent that the air volume to the fin side becomes zero.
The amount of air may be reduced to such an extent that the yarn spun out after cutting through a certain opening is blown away by the cooling air and does not fall downward.

In the above embodiment, yarn breakage due to occurrence of yarn abnormality is detected using the dancer roller 18 and the detector 19 activated by constant rotation of the dancer roller 18. It can be used as appropriate, and if abnormal occurrence of yarn is detected and the yarn is automatically cut, it is possible to use not only a yarn breakage detector but also a yarn abnormality occurrence detector or cutter itself and the main damper. They may be linked.

Furthermore, the main damper 9 and the discharge nozzle 8 are connected to the cooling device 2.
However, it goes without saying that these may be provided in the branch pipe 22, or that the main damper 9 and the discharge nozzle 8 may be located at different locations.

In addition, the cooling device in the present invention refers to a device whose main purpose is to cool the spun yarn, and includes a device integrated with or included in the spinning tube, a device provided separately, or a cooling device only. It is used without a spinning tube connected.

As explained above, according to the present invention, when an abnormality such as thread breakage occurs, the main damper is activated in conjunction with the detection by the abnormality occurrence detector, and the cooling air blowing to the abnormality-occurring weight is stopped or reduced. Similarly, the auxiliary damper operates and the opening is adjusted so that no change in flow rate occurs, and the cooling air flows outside from the exhaust nozzle, so the flow rate before and after the main damper operates is almost unchanged, and the cooling air is not changed to other weights. There is no change in the amount of air supplied.
Therefore, there is no effect on the process condition of the other spindles or the obtained yarn quality, and therefore, there is a great effect that there is no trouble caused by changes in the air volume of the other spindles or the trouble of adjusting the same as in the past.

[Brief explanation of the drawing]

FIG. 1 is a schematic view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a part of the cooling device and flow rate detector section of FIG. 1. 2...Cooling device, 7...Introduction nozzle, 8...Discharge nozzle, 9...Main damper, 11...Fluid pressure cylinder, 18...Dancer roller, 19'...
Limit switch, 20... Controller, 21... Main duct, 22... Branch pipe, 24... Auxiliary damper, 28... Air motor, 30... Solenoid valve, 3
1... Orifice.

Claims (1)

[Claims] 1. A cooling device for blowing out cooling air for the spun yarn is provided at a position below the spinning pack corresponding to a spinning pack having a plurality of spindles, and each of the cooling devices and a blowing pipe having a common supply source are connected to a branch pipe. In a melt spinning apparatus connected via a branch pipe or cooling device, a discharge pipe having an auxiliary damper for adjusting air volume is attached, and a flow rate detector is provided on the upstream branch pipe of the discharge pipe, and the flow rate detector and the auxiliary damper are connected to each other. In addition, a main damper is provided in the vicinity of the attachment part of the discharge pipe or on the upstream side thereof, and the main damper is linked with a yarn abnormality occurrence detection means arranged in the yarn travel path. A melt spinning apparatus characterized in that when an abnormality occurs, a main damper is activated to discharge cooling air from a discharge pipe.