JP2000192324A - Yarn drawing apparatus for spinning facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn drawing apparatus for spinning facilities, capable of maintaining the fixed thickness of yarn produced during a startup operation and yet greatly reducing the number of operators and man-hour during a startup operation. SOLUTION: This yarn drawing apparatus is equipped with plural rollers 5 for transporting a yarn extruded from a spinneret and coagulated while drawing the yarn, plural motors 6 for rotating and driving each roller and a controller 8 for sending a speed signal to each motor 6. The controller 8 is constituted to make the whole rollers at the same fixed speed during a threading operation, after the end of threading, operating any downstream motor 6 at a higher speed than any upstream motor 6 and sends a speed signal for increasing the rotational speed of each motor in an approximation to a linear function of time to each motor 6 so as to increase and to reduce the rotational speed ratio of the motors according to a bad condition while maintaining the final target speed ratio of the rollers 5 substantially constantly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fiber drawing device for a spinning facility. More specifically, in a synthetic fiber spinning facility, a fiber of a spinning facility including a plurality of rollers that are passed through and rotated to drive a fiber extruded from a spinneret and solidified while being drawn. It relates to a stretching device.

[0002]

2. Description of the Related Art As shown schematically in FIG. 5, a spinning machine 51 in a plant for producing synthetic fibers such as acrylic fibers.
In a spinning / drawing facility (hereinafter referred to as a spinning facility) 54 including a water washing machine 52, a hot stretching machine 53, and the like, for example, a raw material liquid 55 of an acrylic fiber is extruded from a spinning nozzle 57 into a coagulating liquid by a gear pump 56 or the like. In some cases, the yarn bundle 58 is stretched while being fed by a number of rollers 59 while washing the coagulation liquid with water.

[0003] Specifically, the above-mentioned many rollers are divided into a plurality of blocks, and the roller peripheral speed (equivalent to the yarn bundle conveyance speed) of the downstream block of the yarn bundle conveyance flow is equal to the gear pump speed of the upstream block. It is set higher than the raw material extrusion speed or the peripheral speed of the roller. Thereby, tension is applied to the yarn bundle and the yarn bundle is stretched. During the steady operation, the speeds of the gear pump and the rollers are controlled to be constant over time. If the speed of any one of the rollers changes, the yarn bundle sags or breaks between the rollers before and after that. Also, the thickness of the yarn changes, and it cannot be a product.

In this specification, a gear pump is also referred to as a first roller, and a roller hereinafter is used to include a gear pump.

In operation, first, while rotating the rollers of each block of the above device at low speed and substantially the same speed, a thread bundle is passed through each roller by a human hand (hereinafter, also referred to as threading). Raise the rollers of the block to their respective target speeds.

When increasing the roller speed, if the speed difference between the front and rear rollers suddenly increases, the tension of the yarn bundle suddenly increases, and the yarn bundle may be cut. vice versa,
If the speeds of the front and rear rollers are reversed, a problem occurs in which the yarn bundle sags and winds around the rollers.

In order to avoid such a situation, conventionally, 30
Many workers are placed on a stretching line over about m, and the roller speed of each block is gradually increased, and care is taken so that the speed difference before and after does not become smaller than reverse rotation and does not suddenly increase. It has increased to the target speed. Specifically, using an individual speed setting device that changes and sets the speed of the roller for each block, and a master speed setting device that sets the rollers of the entire line by accelerating and decelerating at a constant rate,
Roller speed is manually accelerated on site. That is, the roller of the most downstream block is accelerated so that the yarn bundle does not cut, and then the roller of the adjacent upstream block is similarly accelerated so that the yarn bundle is not cut and the yarn bundle does not sag between the downstream. Then, the rollers of the adjacent upstream block are similarly accelerated in order to accelerate the rollers of the entire line to the intermediate speed, and this acceleration operation is repeated a plurality of times (for example, six times) to reach the final target speed. Let it happen.

FIG. 6 shows the history of an example in which the rollers of all the blocks are accelerated to the final target speed by the above operation after the completion of the threading. At time 0, all the rollers are at the threading speed. In this example, the peripheral speed of the roller is 4 m / min. In the figure, the first roller (gear pump) is the roller arranged at the uppermost stream, and the second, third,
, And the eleventh roller is the roller disposed at the most downstream. FIG. 6 shows the state after the threading is completed (time point 0), the time when the final target speed is reached (time point 30 minutes), and the first five minutes of the steady operation. The step indicates a step of accelerating the roller from the eleventh roller to the first roller. Then, such a cycle was repeated six times (by steps 1 to 6), and finally all the rollers could be set to the target speed. About 30
It is taking minutes. Some rollers have a reduced peripheral speed in the acceleration stage, but this occurs during operations such as changing the speed range when switching between acceleration by the individual speed setting device and acceleration by the master speed setting device.

[0009] The fibers produced in steps 1 to 6 cannot be commercialized because their thickness (denier) is out of the target value.

[0010]

As described above, manual control at the site is very difficult, and a so-called start-up operation from completion of threading to a steady operation requires a plurality of skilled workers. It takes as long as about 30 minutes. The resulting fiber that cannot be commercialized is 3600
The length m was 720,000 to 1,080,000.

The inventors of the present invention have conducted intensive studies and researches on the movement of the roller during the start-up operation and the fiber thickness at that time in order to solve such a problem. As a result, the first and the eleventh at the final target speed are obtained. It has been discovered that maintaining the speed ratio between the rollers even during the acceleration phase of the rollers is a very important factor in keeping the thickness of the product fiber constant.

Thus, the present invention significantly reduces the time required for the start-up operation of a spinning facility in a chemical fiber plant, greatly reduces the number of required workers, and furthermore, the fiber manufactured during the start-up operation. It is an object of the present invention to provide a fiber drawing device of a spinning facility that can also be used as a product.

[0013]

SUMMARY OF THE INVENTION A fiber drawing apparatus according to the present invention comprises a plurality of blocks arranged along the flow of a fiber in order to feed a fiber bundle in the form of a bundle bundle extruded from a spinning port and solidified. Rollers, a plurality of drives for rotating the rollers of each block, and a controller for sending a speed signal to each drive, the controller is more than the rollers of the upstream block It is configured to transmit a speed signal that accelerates the rollers in the downstream block while increasing the speed and maintaining a substantially constant speed ratio between the rollers.

Therefore, the speed can be accelerated while maintaining the speed ratio between the rollers at the ratio of the final target speed of each roller, so that the thickness of the fiber to be manufactured can be kept constant. In addition, the yarn bundle is not cut or slack between the rollers. As a result, most of the fibers produced during the start-up operation can be commercialized. Moreover, a large number of workers and a long time are not required for the start-up operation as in the related art.

A frequency converter for supplying power is provided in each of the driving machines, and a frequency conversion signal corresponding to the speed of the roller is transmitted from the controller to the frequency converter. Thus, the above-described operation can be achieved without requiring a complicated mechanism.

Further, the controller is configured to be capable of transmitting a speed signal for increasing the speed of the roller by approximating a linear function of time to each driving device, so that the control is easy and the driving device Can also respond accurately.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fiber drawing apparatus according to the present invention will be described based on an embodiment shown in the accompanying drawings.

FIG. 1 is an explanatory view showing one embodiment of the fiber drawing apparatus of the present invention. FIG. 2 is a graph showing an example of a temporal change in the speed of each roller during a start-up operation by the fiber drawing apparatus of FIG. FIG. 3 is a graph showing an example of a temporal change in the speed of each roller during operation by the fiber drawing apparatus of FIG. FIG. 4 is a graph comparing the thickness of the fiber obtained by the fiber drawing apparatus of FIG. 1 with the thickness of the fiber obtained by the conventional technique.

The arrangement of the spinning machine and the rollers in the spinning equipment to which the fiber drawing apparatus of the present invention can be applied is the same as the conventional one shown in FIG.

A fiber drawing device 1 shown in FIG.
A washing machine 3 and a hot drawing machine 4 are provided, and a plurality of blocks of rollers 5 are arranged in each device along the direction of fiber flow. In this embodiment, there are 11 blocks. The number of rollers provided in each block is one or more, and the rotation speed of the motor is the same for each block. In the present embodiment, it is assumed that one roller 5 is provided for each block. Each roller 5 is connected to a motor 6 for driving the roller to rotate. The yarn bundle extruded from the spinning nozzle and solidified is the first, second,..., Eleventh downstream roller (ie, the first, second,. (The eleventh block).

Each motor 6 is provided with an inverter 7 for converting the frequency of the electric power supplied thereto.

In the figure, reference numeral 8 denotes a controller, which sends a speed signal to each inverter 7 to set a frequency corresponding to a predetermined rotation speed (hereinafter simply referred to as speed) of each motor 6. The frequency of the power supplied to the motor 6 corresponds to the speed of the motor 6 and thus the speed of the roller 5 on a one-to-one basis. The predetermined speed (corresponding frequency) can be changed continuously.

The memory of the computer 8a of the controller 8 includes:
For each inverter 7, a frequency corresponding to a speed that becomes a final target value (steady operation speed) of each motor 6 corresponding to the inverter 7 is stored. This final target speed is changed according to the target production amount. The peripheral speed ratio between the rollers 5 (rotational speed ratio between the motors 6) is changed according to the type of fiber of the product.

The controller 8 is set with motor speed change instructions in a plurality of modes. The computer 8a in the controller 8 calculates the motor speed at each time point by approximating the speed change of each motor 6 to a linear function of the elapsed time from a predetermined time point, and transmits this to the inverter 7 as a speed signal. can do. On the other hand, the sequencer 8b of the controller 8 sends a predetermined operation instruction signal to each inverter 7 according to an instruction from the operation panel 9 described later, and sends a speed signal corresponding to the operation instruction to the computer 8a. An instruction signal is sent to send.

The point of the control function of the present fiber drawing apparatus 1 is that, for each inverter 7, each motor 6
Is capable of transmitting a speed signal that changes in approximation to a linear function of time. further,
A constant multiplied by time, which is a variable, is also set so as to be a ratio of the speed which is the final target value of each motor 6. As a result, when all the motors 6 are accelerated, the ratio of the speeds of the motors 6 is the ratio of the final target speeds of the motors 6 at any time.

Note that the speed characteristic of each motor 6 with respect to time is not limited to a linear function of time, but may be approximated to, for example, a quadratic function. A linear function is preferred.

This constant can be arbitrarily increased or decreased under the condition of the ratio of the final target speed of each motor 6. Therefore, when all the motors 6 are accelerated, the overall speed can be changed in a state where the ratio of the speeds of the motors 6 becomes the ratio of the final target speeds of the motors 6.

By doing so, the acceleration that reaches the target speed can be changed according to the type of fiber of the product.
Furthermore, when it is desired to reduce the fiber transport speed in response to an unexpected abnormality during operation, it is possible to reduce the speed while maintaining a predetermined speed ratio between the motors 6. That is, the speed can be reduced while maintaining the current thickness of the fiber and without causing the yarn bundle to be cut or slack.

Further, an operation panel 9 for executing the above controller is provided in the stretching apparatus 1. This operation panel 9
Start button 11, low-speed button 12, medium-speed button 1
3. A high-speed button 14 is provided.

FIG. 2 shows a change in the speed of all the rollers 5 due to the following pressing operation of the button. It should be noted that the horizontal axis in FIG. 2 is not proportional to the elapsed time, but merely shows the time points of the speed levels of the first speed, the second speed, and the third speed, which will be described later, at intervals.

When the start button 11 is pressed, the controller 8
To all the inverters 7 at the same predetermined low speed (threading speed), for example, 4 m /
A speed signal to be rotated in minutes is issued. In this state, the operator performs threading. Instead of the start button, a dial type that can be continuously changed while keeping the frequency of all inverters 7 the same may be provided.

Next, when the low speed button is pressed, the speed ratio between the motors 6 is accelerated with a linear characteristic to a predetermined low speed (referred to as a first speed) which is the ratio of the final target speed of each motor 6. You. The predetermined low speed generally means a speed higher than the speed at the time of the threading even at the lowest speed of the roller (first roller), for example, about 5 m in the peripheral speed in the illustrated example.
/ Min. The peripheral speed of the highest speed roller (eleventh roller) at this time is about 50 m / min. In the process of accelerating from the threading speed to the first speed, since the speed ratio between the motors 6 does not become the ratio of the final target speed, the fibers produced during this time are discarded. However, this time is very short, and the fiber transport speed is low, so that the loss is very small.

Next, by sequentially depressing the middle speed button 13 and the high speed button 14, the respective motors 6 sequentially maintain a predetermined ratio while maintaining the mutual speed ratio being the ratio of the final target speed of each motor 6. It is accelerated by a predetermined acceleration to the speed, that is, from the first speed to the third speed (final target speed) through the second speed in a stepwise manner.

That is, the operation state of the line is observed at the first speed, and if there is no abnormality, the middle speed button is pressed. Then, the respective motors 6 maintain a state where the mutual speed ratio is the ratio of the final target speed of each motor 6, while maintaining the state where the speed ratio between the motors 6 is the ratio of the final target speed of each motor 6. It is accelerated by a predetermined acceleration until (second speed). The predetermined medium speed is, for example, about 15 m / min in the peripheral speed of the first roller and about 148 m / min in the eleventh roller in the illustrated example.

In this state, the operation status of the line is observed, and if there is no abnormality, the high-speed button is pressed. Then,
Each motor 6 is accelerated by a predetermined acceleration to a final target speed (third speed) while maintaining a state where the mutual speed ratio is the ratio of the final target speed of each motor 6, and enters a steady operation state. Further, the final target speed is, for example, about 18 m / min in the peripheral speed of the first roller in the illustrated example and about 195 m / min in the eleventh roller.

From the above-mentioned first speed to the final target speed, the first roller and the eleventh roller have the same speed ratio as in the steady operation, so that the thickness of the fiber is constant. The finished fibers can be commercialized.

In this embodiment, from the completion of the threading to the start of the steady operation at the final target speed, depending on the set speed, 30
It only takes seconds to 3 minutes. In the present invention, in particular, after setting the first speed without passing through the second speed, the vehicle may be continuously accelerated to the final target speed. Alternatively, two or more speeds may be set between the first speed and the final target speed. Further, it is optional to increase or decrease the first speed or the second speed, that is, the intermediate speed.

FIG. 3 shows the change in speed of all the rollers 5 with respect to the elapsed time in a part of the above-described start-up operation and steady operation after the completion of the threading. As described above, in the related art, the start-up operation after the completion of the threading required about 30 minutes, but in the present embodiment, the start-up operation after the completion of the threading requires only a maximum of 3 minutes before the start of the steady operation. Therefore, the start-up operation time is 1/10 compared to the prior art.
It is reduced to the following and saves a great deal of time. Furthermore, in this embodiment, only three or four workers are required,
Labor costs are also reduced compared to the prior art, which required about 13 people. Furthermore, as described above, since most of the fibers produced during the start-up operation become commercial products, the yield of raw materials is also improved. Of course, neither cutting nor sagging of the yarn bundle occurs.

In this embodiment, the ratio of the peripheral speed of the corresponding roller to the rotational speed of each motor has been described as being the same. That is, all rollers had the same diameter. However, the present invention is not limited thereto,
Rollers having different diameters may be mixed. However, in that case, the "speed ratio" and "the ratio of the final target speed" in the case of "acceleration / deceleration using the speed ratio between the motors as the ratio of the final target speed" are only for the peripheral speed of the roller. .

[0040]

FIG. 4 shows the thickness of the fiber produced during the start-up operation from the completion of the threading to the point in time when the steady operation is started. The target thickness of the fiber in the steady operation was set to a product allowable range of 3 ± 0.18 denier indicated by a dashed-dotted frame in the figure.

The fiber thickness was measured and recorded at nine levels including the initially set speed (50 m / min) and the final speed (195 m / min), and seven levels between them. The measurement object is the example, the first comparative example, the second comparative example, and the third comparative example. In each case, the displayed speed is the peripheral speed of the highest speed roller among the 11 rollers, that is, the peripheral speed of the lowermost roller.

In each of the comparative examples, the start-up operation was performed by the method described in the section of the prior art, and after the threading was completed, the peripheral speed of the lowermost roller was reduced to 50 m / min by the aforementioned method. The average value of the thickness (denier) of the yarn after the point of acceleration up to is shown.

In the embodiment, the first speed was set to 50 m / min and the start-up operation was performed by the above-mentioned method. The average of the yarn thickness (denier) after the time when the first speed was set was set. Values are shown.

As shown in the figure, in the embodiment, the thickness of the produced fiber has almost no variation. This is thought to be because the speed ratio between the first roller (gear pump) and the eleventh roller from the time when the initially set speed (first speed) was set matches the ratio of the final target speed. Can be But,
In all three comparative examples, there was a large variation in the fiber thickness until the final target speed was reached, and it could not be commercialized. This is probably because the speed ratio between the first roller and the eleventh roller was far from the final target speed ratio.
This is clear from FIG.

[0045]

According to the fiber drawing apparatus of the present invention, it is possible to accelerate while maintaining the rotational speed ratio between the driving machines at the ratio of the final target speed of each driving machine. Can be kept constant. As a result, fibers produced during the start-up operation can also be commercialized.
Moreover, since a large number of operators and a long time are not required for the start-up operation as in the related art, the manufacturing cost is greatly reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a fiber drawing device of the present invention.

FIG. 2 is a graph showing an example of a step of changing the speed of each roller during a start-up operation by the fiber drawing apparatus of FIG. 1;

FIG. 3 is a graph showing an example of a temporal change in the speed of each roller during operation by the fiber drawing apparatus of FIG. 1;

FIG. 4 is a graph comparing the thickness of a fiber obtained by the fiber drawing apparatus of FIG. 1 with the thickness of a fiber obtained by a conventional technique.

FIG. 5 is a side view schematically showing an example of a conventional fiber drawing apparatus.

FIG. 6 is a graph showing an example of a temporal change in the speed of each roller during a start-up operation by a conventional fiber drawing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fiber drawing apparatus 2 ... Spinning machine 3 ... Washing machine 4 ... Hot drawing machine 5 ... Roller 6 ... Motor 7 ... Inverter 8 ... Controller 8a ... Calculator 8b Sequencer 9 Operation panel 11 Start button 12 Low speed button 13 Medium speed button 14 High speed button 51 Spinning machine 52 Washer 53 ..Hot drawing machine 54 ... Spinning / drawing equipment 55 ... Raw material liquid 56 ... Gear pump 57 ... Spinning nozzle 58 ... Thread bundle 59 ... Roller

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[Procedure amendment]

[Submission date] October 1, 1999 (1999.10.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

SUMMARY OF THE INVENTION A fiber drawing apparatus according to the present invention comprises a plurality of blocks arranged along the flow of a fiber in order to feed a fiber bundle in the form of a bundle bundle extruded from a spinning port and solidified. the roller and, a plurality of driving device for rotating the roller of each block, and a control unit sending a velocity signal to each driving device, the controller is, the threading luck
At the time of rotation, set all rollers to the same predetermined low speed and finish threading.
Later, the speed of the rollers in the block downstream from the rollers in the upstream block should be increased, and the speed should be controlled in multiple stages according to the malfunction while maintaining the speed ratio between the rollers substantially constant.
It is configured to transmit a speed signal for Ku pressure decrease speed.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

Further, the controller can be configured to transmit a speed signal to each of the driving machines to increase and decrease the speed of the roller by approximating a linear function of time. And the drive can also respond accurately.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryoichi Oike 3-1-1, Higashi-Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Inside the Kobe Plant of Kawasaki Heavy Industries, Ltd. (72) Inventor Yosuke Suezawa Higashi-Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo 3-1-1, Kawasaki Heavy Industries, Ltd., Kobe Plant (72) Inventor Masatoshi Horikiri 3-1-1, Higashi-Kawasaki-cho, Chuo-ku, Kobe, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Yoshimasa Hayashi Okayama 3-3-1 Kanaoka-Higashi-cho, Okayama-shi, Japan F-term (reference) in Nihon Xlan Industrial Co., Ltd. Saidaiji Plant 4L036 AA01 4L045 AA05 BA03 DA41 DA60 DB07 DC02

Claims (3)

[Claims] 1. A plurality of blocks of rollers arranged along a fiber flow for drawing and sending a solidified fiber extruded from a spinning port, and a plurality of rollers for rotating the rollers of each block. And a controller for sending a speed signal to each of the drives, the controller speeds up the rollers of the blocks downstream of the rollers of the blocks upstream and reduces the speed ratio between the rollers. A fiber drawing device for a spinning facility configured to emit a speed signal that accelerates while maintaining substantially constant. 2. A frequency converter for supplying electric power is provided in each of the driving machines, and a frequency conversion signal corresponding to a roller speed is transmitted from the controller to the frequency converter. The fiber drawing device of a spinning facility according to claim 1, which is constituted. 3. The spinning apparatus according to claim 1, wherein the controller is capable of transmitting a speed signal to each drive to increase the speed of the roller by approximating a linear function of time. Fiber drawing equipment.