TW200413586A - Apparatus for spinning and winding at least one synthetic yarn - Google Patents

Abstract

The invention relates to an apparatus for spinning and winding at least one synthetic yarn by means of a spinning device and a takeup device. Between the spinning device and the takeup device, a first driven godet and a second driven godet are arranged, which are partially looped by the yarn. To be able to adjust a speed difference between the first godet and the second godet, electric motors are provided, which connect in accordance with the invention to a control device, and which are controlled by a nominal frequency. One of the electric motors is made as an asynchronous motor, which has a speed slip that corresponds to the speed difference.

Description

200413586 (1) Description of the invention: The technical field of L inventors] Field of the invention The present invention relates to a device for spinning and winding at least one synthetic yarn, as defined in the preamble of item 1 of the scope of patent application. BACKGROUND OF THE INVENTION A device of this type is known, for example, from German patent application DE 44 16 136 A1. 0 10 For spinning and winding a synthetic yarn, the known device includes a spinning element, a first driven guide The wire reel and a second driven guide wire reel also include an access element. In this device, a first godet driven by an electric motor is withdrawn from a spinneret of a spinning element after a melting spinning step. As a result, the yarn is partially wound around the first godet. An electric motor likewise drives a second godet downstream of the first godet, and it has a speed difference adjusted between the first and second godets. The magnitude of the speed difference depends on the type of yarn produced. When producing synthetic multifilament yarns from a thermoplastic melt, it is basically possible to distinguish between partially drawn yarns and fully drawn yarns. The partially drawn yarn system includes a predetermined molecular structure, which requires a subsequent drawing in the second processing step 20. This is called a predetermined direction (PO) yarn. In contrast, fully drawn (FDY) yarns are directly suitable for further processing without subsequent drawing. Therefore, it is known that for the production of FDY yarns, it is necessary to adjust the large speed difference between the godets. Conversely, when spinning and winding a predetermined yarn direction, a small speed difference is required between the godets. In the production of polyester yarns, this speed difference is, for example, in the range of 0.1% to 5 200413586 0.5%. Therefore, it is necessary to achieve and maintain the adjusted speed on each guide wire with high accuracy during processing. Therefore, in the case of known devices, a control element is often connected to each electric motor, so each electric motor can be controlled by a nominal frequency that determines the speed. As a result, the requirements for the control elements are the same in each process variation 5, regardless of the magnitude of the speed difference. [Summary of the Invention] Summary of the Invention

Therefore, an object of the present invention is to improve a device of the initial description type by allowing a small speed difference between a first driven guide disc and a second driven guide disc, and its Requires very few control elements while maintaining high accuracy. According to the present invention, this is achieved by providing a control element for both electric motors. This method can control an electric motor at a nominal frequency, and an electric motor is made as an asynchronous motor and has a corresponding Speed difference of 15 degrees.

The present invention can utilize the following knowledge: a non-synchronous motor started by a nominal frequency produces a smaller actual frequency due to the speed slip required by its principle, and therefore has a lower driving speed. Therefore, a speed difference of about 20 speed slips can be achieved in a simple manner without additional control members. In order to be able to adjust and change the speed difference, a further development of the present invention will be particularly advantageous, in which the control element includes a variable voltage / frequency ratio by which the asynchronous motor can be controlled to change the speed slip. The ratio of voltage to frequency will affect the magnetization of asynchronous motors, resulting in changes in speed slip. 6 200413586 Based on the robustness of the asynchronous motor, slight over-magnetization or under-magnetization is not important, so speed slip adjustments can be made without major losses.

In another particularly advantageous further development of the invention, an inductor is connected to the asynchronous motor. Use this sensor to measure the actual frequency 5. The sensor is connected to the control element via a signal line, so within the control element, the slip conditions of the asynchronous motor may be adjusted separately from the actual and nominal frequency, so it can directly match the required voltage / frequency ratio. Speed difference. Thereby, it is possible to control with favorable irregularities that occur during operation, such as by load changes, so that an actual frequency and therefore a peripheral speed of one of the guide disks including 10 separately driven are kept approximately constant during the entire operation cycle .

A non-synchronous motor operating in this manner can drive the second godet and the first godet as a function of the produced yarn. In the case where the second godet is driven by a lower actual frequency that deviates from the nominal frequency, a speed difference of 15 is obtained, which causes the yarn tension between the first and second godets to decrease. In this case, the first godet is driven at a higher peripheral speed than the second godet. In cases where a slight increase in yarn tension is required, the first godet can be advantageously driven by a non-synchronous motor. In this manner, the first guide wire disc is driven at a lower speed than the second guide wire disc as a result of the speed slip of the asynchronous motor. In order to be able to use a non-synchronous motor to adjust the speed difference with the largest overall speed slip range during the operation of the godet, an advantageous further development of the present invention proposes to form it by a synchronous motor or a reluctance motor. Other electric motors. With this, it is possible to drive a godet at a speed corresponding to the nominal frequency. Similarity: It is possible for a motor to drive each of the two guides. "The non-synchronous motor is made as electrically" soft "as possible, that is, it has the corresponding expansion of the duck and its voltage / frequency ratio: , = Change: In comparison, the second non-synchronous motor is made electrically "Gang Li I off,", has a small degree of turbulence, and its general electric / frequency ratio is only 0. In an advantageous situation, the asynchronous motor control method can be used to control the "soft," asynchronous asynchronous motor through volts / Hz! In the case where a large speed difference is needed between the guide and the second guide disc, the first diameter of the outer diameter of the second guide disc may be determined in advance, and the basic adjustment may be made. For example, the second guide disc may be adjusted. It is provided with a shell diameter larger than that of the first guide wire reel, which can be obtained on the second guide wire reel with the same 15-frequency adjustment.-A larger peripheral speed sets the speed difference basically slightly. Field difference control. Wither 1, the speed of the non-synchronous motor is used. The godet and / or the second godet can be wrapped with 20 = heat-like additional heating elements, so it is possible to perform heat on the yarn. The characteristic according to item g of item 1 of the patent is that it needs to be relatively small n This method can be used to control the speed difference between two guide reels with high accuracy. The method of the present invention can advantageously include the control of the speed difference between two guide reels- The principle requires a speed slip of 8 200413586, which is often found to be unfavorable. By this, it may be advantageous to achieve a mainly small speed difference. Therefore, it is better to determine and change the voltage on the associated control element in advance. / Hertz ratio to control the speed difference. Each time the nominal frequency provided in a different volts / Hertz 5 ratio case will cause the speed slip of the started asynchronous motor to change.

The apparatus and method of the present invention are both particularly suitable for making synthetic yarns into so-called POY yarns. In this treatment, a polymer such as polyester, polyamide or polypropylene can be used. 10 Brief Description of the Drawings Hereinafter, other advantages of the present invention will be described in detail through one embodiment of a device of the present invention with reference to the drawings, in which: FIG. 1 is a schematic diagram of a first embodiment of a device according to the present invention; Figure 2 is a schematic cutaway 15 of another embodiment of the device according to the present invention.

[Embodiment 3 Detailed Description of the Preferred Embodiment FIG. 1 is a schematic diagram of a first embodiment of a device according to the present invention. For a melt spinning operation, the device of the invention comprises a spinning element 1. In the embodiment of Fig. 201, the spinning element 1 is formed of a spinning head 3 and a spinneret 4 arranged on the bottom side of the spinning head 3. The spinning head 3 includes a spinning pump and a distribution line (not shown) and is connected to a plurality of spinnerets. Therefore, the spinning head 3 has a structure that can be heated. A polymer melt is supplied to the spinning head 3 through a melt supply line 2. For the sake of clarity, this embodiment only shows a path of 9 200413586 yarns. The spinneret 4 located on the bottom side of the spinning head 3 includes a plurality of nozzle apertures, and the polymer melt can be extruded through the plurality of nozzle apertures under pressure. Therefore, a plurality of strands for forming a tow 5 leave 5 ° from the spinneret 4 directly downstream of the spinneret 4 to provide a cooling element for cooling the tow just extruded. In the illustrated embodiment, the cooling element 6 is realized by an air flow system for directing a cooling air flow from the outer branch to the tow 5. Downstream of the cooling element 6, a yarn lubricating element 7 and a yarn guide 8 are provided to merge the tow 5 into a yarn 9. 10 The first yarn guide 10 and the second yarn guide 13 are partially wound around the receiving yarn 9 and extend in the direction of advancing the yarn. An electric motor in the form of a synchronous motor u is connected to the __th guide wire disc 10. The second wire guide boat 3 extending in the 々 path downstream of the first wire guide 10 is driven by an electric motor which is an asynchronous motor i4. In order to control the synchronous motor 11 and the asynchronous motor 14, a control element 12 is provided. The synchronous horse is connected to the control unit via a control line 19 · 2 and the asynchronous motor 14 is connected to the control element via a control line 19 · The asynchronous motor 14 includes a frequency sensor 15 and is connected to Control element 12. In order to receive and retain the yarn 9, the pick-up element 16 is arranged downstream of the second guide wire 2013. In the pick-up element 16, the yarn is wound to a package? Formed on a rotating winding mandrel 18. In the embodiment shown in Fig. 1, the yarn 9 is drawn from the rotary element 1 by the first guide disc 1G and the second guide disc 13. In this process, the first godet 10 and the -th godet 13 are driven with a speed difference. In order to drive the first guide wire disk 10 10 200413586, the control element 12 receives a nominal frequency f nominal. Via the control line 19.2, the control element 12 causes the synchronous motor 11 to be started with a nominal frequency f nominally. Therefore, the first godet 10 has a peripheral speed corresponding to the nominal frequency f.

Via the control line 19.1, the asynchronous motor 14 likewise receives a nominal frequency f 5 to thereby be activated. Based on a speed slip of the non-synchronous motor 14, the second godet 13 reaches a peripheral speed corresponding to an actual frequency fim which is nominally smaller than a predetermined nominal frequency f. Therefore, the second godet 13 has a peripheral speed slightly lower than that of the first godet 10, so a speed difference can be operated between the two godets 10 and 13. 10 The required speed difference between the first godet 10 and the second godet 13

It is input to the control element 12 in the form of a frequency difference. In order to adjust and control the predetermined speed difference, the respective actual frequencies fim are measured in the asynchronous motor 14 via the rotatable frequency sensor 15 and supplied to the control element 12 via the signal line 20.1. A difference between the nominal frequency f and the actual frequency fim is formed in the control element 12 to determine the actual value of the respective frequency difference and to compare it with the set value of the frequency difference. In the case of a deviation, the manner in which a predetermined voltage / frequency ratio V / f varies within the control element 12 can be nominally a rotational slip in the asynchronous motor 14 by an unchanged nominal frequency f. The change leads to a change in the actual frequency. As a result, it is possible to adjust and maintain a predetermined speed difference between the first godet 10 and the second godet 13. For example, it is so possible to determine a speed slip of 0.2% at a voltage / frequency ratio of 1.4 volts / hertz in one of the asynchronous motor cases operating at a drive speed of 3,000 meters per minute. With the same driving speed, the voltage / frequency ratio becomes 0.8 volts / hertz in the control element 12. This results in an increase in speed slip in non-synchronous motors as high as 0.6%. In the production of POY yarns, the first godet 10 and the second godet 13 operate at a speed difference in the range of 0.1 to 0.5%, so a slight change in the voltage / frequency ratio is sufficient to cover the entire speed difference range. As a result, the simultaneous over-magnetization or under-magnetization of one of the asynchronous motors remains within the narrow limit without effect. The yarn 9 advances above the first godet 10 and the second godet 13 without being drawn, and is then wound in the pick-up element 16 to the package?. The winding step is preferably performed by a process in the form of an entanglement, which improves further processing. It is also possible to adjust the yarn tension required for entanglement by the speed difference that can be operated between the godets 10 and 13. Thereby, the embodiment of Fig. 1 is advantageously suitable for spinning and winding POY yarns. Fig. 2 is a cut-away view of another embodiment, in which the spinning element 1 and the receiving element 16 are not shown. These elements are the same as the embodiments described above, so the above description is incorporated herein by reference. The yarn 9 is withdrawn from the spinning element via the first godet 10u. Therefore, the first guide wire disk 10 has a diameter ruler. In the path of the advancing yarn, downstream of the first godet 10, the second godet 13 is recognized and it includes a casing with a diameter D2. The outer diameter d2 of the second godet 13 is made larger than the outer diameter of the first godet 1 ()

Di 〇 The godet 10 is driven by an asynchronous motor 21, and the asynchronous motor is connected to a control element by a control line 20 · 2. A rotatable frequency sensor μ connected to the control element U via a signal line · 2 is connected to the asynchronous motor 21. According to the above embodiment, the second godet 13 is driven by the synchronous motor 14 and the stepping motor 14 is connected to the control Yuanxian through the line 191. The embodiment of the asynchronous motor M of the second upper plate 13 has a consistent occurrence manner, so the above-mentioned known examples are incorporated herein by reference. "Horse: The asynchronous motor 14 of the second guide wire reel 13 turns the speed of the second asynchronous 10" electrically rigid ". Therefore, the 'asynchronous motor 21 has a low-key, The voltage / frequency ratio is largely independent. In order to control the peripheral speed on the non-D disk, the rotatable frequency sensor 22 measures the actual frequency on the same V motor 21 and supplies it to the control element. The core piece 12 ' A comparison is made between the actual frequency and the nominal frequency as a 1% positive rate. The corrected nominal frequency is supplied to the asynchronous,, and up to 1 to achieve the required peripheral speed on the-guide wire 10 15 20 Between the first godet 10 and the second godet 13, because there are different selected casings, it can be operated and the speed difference can be manipulated. The speed difference is intended to use the geometry and the structured speed difference as the speed. The basic adjustment of the difference. In order to maintain-"If the selected speed difference is slightly higher or lower than the basic Lin or equal-the 4th and the 13th, the movement system has the same control and perimeter adjustment methods as the above embodiment. Therefore, 'the speed difference of the asynchronous motor M may be adjusted to And kept constant speed difference is substantially fixed. Therefore, the embodiment shown in Fig. 2 can partially depict the yarn 9 before the winding step. This method of changing the method is particularly advantageous when adjusting a speed difference greater than 0.5%. The installation and application of the above embodiments are merely exemplary. Therefore, it is possible to replace and merge the drives of the first and second guides. Similarly, the yarn can rewind the first and second guide wires several times. For example, the two guides can be operated at the same speed by selecting different casing diameters, so there is no operational speed difference. Similarly, it is possible to connect a freely rotatable guide roller to the godet shown in Figs. 1 and 25 to advance the yarn having a plurality of windings. Also, the yarn may be subjected to a heat treatment in which at least one of the godets includes a heating member for heating the casing.

[Brief description of the drawings] Fig. 1 is a schematic view of a first embodiment of the device according to the present invention; Fig. 2 is a schematic cut-away view of another embodiment of the device according to the present invention.

[Representative symbols for main components of the figure] 1 ·· spinning element 11 ··· synchronous motor 2 ... melt supply line 12 ... control element 3 ... spinning head 13 ... second godet 4 ... spinner 14 ... non-synchronous motor 5 ... tow 15 ... rotatable frequency sensor 6 ... cooling element 16 ... receiving element 7 ... yarn lubricating element 17 ... package 8 ... yarn guide 18 ... winding mandrel 9 · · · Yarn 10… First guide wire 19.1, 19.2… Control wire 14

Claims (1)

200413586 Pickup and patent application scope: 1. A device for spinning and winding at least one synthetic yarn, the device includes a spinning element, a first driven godet and a second driven godet, And a pick-up element, wherein the first guide wire disc) and the second guide wire 5 disc are at least partially wrapped around by the yarn, and wherein the first guide wire disc and the second guide wire disc are connected by a The speed difference is driven by a separate electric motor, which is characterized by: A control element is provided for both electric motors, whereby a nominal frequency can be used to control the electric motors, and one such electric motor is made into a non-10 synchronous motor and it has a speed converter corresponding to the speed difference. difference. 2. The device as claimed in claim 1 is characterized in that the control element has a variable volts / hertz ratio for controlling the asynchronous motor to change the speed slip. 3. If the device in the scope of patent application 1 or 2 is characterized in that the asynchronous motor 15 includes a rotatable frequency sensor for measuring an actual frequency, The actual frequency is supplied to the control element via a signal line to make the speed slip match the speed difference. 4. The device according to any one of claims 1 to 3, characterized in that the electric motor of the second godet or the electric motor of the first godet is constituted as the asynchronous motor. 5. The device according to any one of claims 1 to 4, wherein the other electric motor is formed by a synchronous motor or a reluctance motor. 6. The device according to any one of claims 1 to 5, wherein the other electric motor is formed by a second 15 asynchronous motor having a substantially constant speed slip. 7. If the device according to item 6 of the application for a patent, is characterized in that the non-synchronous motor includes a rotatable frequency sensor for measuring the actual frequency, and supplies the inter-frequency ㈣-㈣ line to the ㈣ Component to correct this nominal frequency. 8. If the device of any one of the scope of the patent application, characterized in that each of the first and second guidewire disks has a case diameter, the diameter of the speed difference can be determined in advance using the case diameter. A basic adjustment. 9 · = A device of any one of item ⑴ of the scope of patent application, characterized in that the first guide wire disc and / or the second guide wire disc includes a heating member for heating the casing. 〇 A method for controlling two godets driven at a speed difference during spinning and winding at least one synthetic yarn, wherein the electric motors of the godets are controlled by a nominal frequency, It is characterized in that the speed difference of the godet is adjusted by the speed difference of an electric motor made as an asynchronous motor. 1. The method according to item 10 of the patent application scope, characterized in that the speed slip of the asynchronous motor is adjusted by determining and changing a voltage / frequency ratio in advance. U. The method according to item ⑺ or 丨 丨 of the scope of patent application is characterized in that a basic adjustment of the speed difference is determined in advance by the diameter of the shells of the respective sizes of the guide discs. 16