CN110733932B

CN110733932B - Method for melt spinning and winding yarn

Info

Publication number: CN110733932B
Application number: CN201810796362.4A
Authority: CN
Inventors: 任宪明; 杨旭东; 李士刚; B·舒马赫
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2018-07-19
Filing date: 2018-07-19
Publication date: 2022-12-16
Anticipated expiration: 2038-07-19
Also published as: WO2020016212A1; CN110733932A

Abstract

The invention discloses a method for spinning and winding yarns by using melt, wherein polymer melt is conveyed to a plurality of spinning assemblies at a plurality of spinning positions by a plurality of spinning pumps, the spinning assemblies extrude the polymer melt into a plurality of yarns respectively, the yarns are wound into a plurality of bobbins, one spinning position comprises a plurality of spinning assemblies, and a cleaning robot is controlled by a machine control device to clean the spinning assemblies at the spinning positions. In order to enable all spinning positions to be automatically cleaned within reasonable time, a plurality of spinning positions which are cleaned by one cleaning robot are divided into a plurality of spinning position groups, and the cleaning robot is used for cleaning the spinning position groups in sequence within certain cleaning time.

Description

Method for melt spinning and winding yarn

Technical Field

The invention relates to a method for melt spinning and yarn winding.

Background

In a melt spinning system, molten thermoplastic is ejected under pressure in the direction of gravity through orifices in a spinneret of a spin pack. The continuous elongated melt is formed into continuous filaments under the influence of a forced cooling gas stream. In the actual melt spinning production, the monomer or oligomer inevitably adheres to the surface of a spinneret plate of a spinning pack and is solidified under the action of cooling air flow to form impurities or coke which influences the quality of spinneret. In this regard, periodic cleaning of the spinneret plate of the spin pack assembly is necessary. Typically, a spinning area is assigned to an operator for cleaning the spinneret in that area. The rough cleaning process includes scraping the surface of the spinneret plate, spraying silicone oil to the surface of the spinneret plate, scraping for the second time, and spraying silicone oil for the second time. Typically, there are five or 6 spin packs with spinnerets per spinning station, and the heavy manual cleaning work places high demands on the automation of the cleaning work. Meanwhile, the particularity of the melt spinning process needs to be considered in the automatic process. The "particularity" includes the yarn breakage rate, the number of windings, the grade of the yarn, etc.

Disclosure of Invention

In order to solve the aforementioned problems occurring in the prior art, the present invention provides a method of melt spinning and winding a yarn, and the object of the present invention is achieved by the technical solutions listed below:

a method for melt spinning and winding yarns is characterized in that polymer melt is conveyed to a plurality of spinning assemblies of a plurality of spinning positions through a plurality of spinning pumps, the spinning assemblies extrude the polymer melt into a plurality of yarns respectively, the yarns are wound into a plurality of bobbins, one spinning position comprises a plurality of spinning assemblies, a cleaning robot is controlled by a machine control device to clean the spinning assemblies of the spinning positions, the spinning positions which one cleaning robot is responsible for cleaning are divided into a plurality of spinning position groups, and one cleaning robot cleans the spinning position groups in sequence within a certain cleaning time length respectively.

The spinning positions are divided into a plurality of spinning position groups in an even or uneven mode, the cleaning robot cleans the spinning positions of one spinning position group in a preset cleaning time period, all the spinning positions are automatically cleaned in a reasonable time period, and the condition that the excessive spinning positions are intensively waited for being cleaned is avoided.

When the machine control device detects that the spinning positions with the number larger than or equal to a set value need to be cleaned simultaneously within the cleaning duration of one spinning group, the machine control device can activate a warning lamp.

In order to avoid that more spout the position and concentrate on one and clean in duration for can't accomplish in one cleans in duration and clean, machine control device can report to the police and warn when detecting this kind of circumstances, signals operating personnel to intervene and carries out artifical supplementary cleaning.

The machine control device can adjust the cleaning sequence of the spinning positions by detecting the times of yarn breakage or doffing and according to the detection result.

The number of yarn breakages or the number of windings is an additional reference index for determining whether to perform the spinneret cleaning. And under the condition that the yarn breakage frequency or the yarn winding frequency is high, the machine control device identifies and improves the cleaning priority of the spinning position, and controls the cleaning robot to clean the spinning position earlier.

When the machine control device detects that the spinning positions with the number larger than or equal to the set value need to be cleaned within the cleaning duration of one spinning position group, the machine control device can adjust the cleaning sequence of one or more spinning positions.

When more spinning positions are detected to be required to be processed, the invention provides two schemes for advancing or pushing the cleaning sequence of the spinning positions, wherein the first scheme is as follows: within the cleaning duration, cleaning the spinning position is advanced or retreated, so that the cleaning work is not concentrated in a time period; the second scheme is as follows: in particular cases, if a purge duration is near the end of the purge duration, the spinning positions of a portion of the filaments are pushed back into the next adjacent purge duration.

Based on the first scheme, when the machine control device detects that the spinning positions with the number greater than or equal to a set value need to be cleaned in the cleaning duration of one of the spinning plate bit groups, the machine control device can advance or retard the cleaning sequence of the spinning positions needing to be cleaned in the cleaning duration.

Based on the second scheme, when the machine control device detects that the spinning positions which are more than or equal to the set value number need to be cleaned when the cleaning time of one of the spinneret plate bit groups approaches the end, the machine control device can push back the spinning positions which need to be cleaned when the cleaning time approaches the end to the next adjacent cleaning time.

Wherein the set value number is two or more.

The cleaning period is determined by the group value of the spinning bit group and the cleaning time value, and specifically, the relationship between the cleaning period value and the group value of the spinning bit group and the cleaning time value is as follows: the cleaning period value of each spinning position is set to be Z, the group number value of each spinning position group is set to be X, the cleaning time length value of each spinning position group is the same and set to be Y, and the range of Z is equal to X Y-Y to X Y + Y.

Wherein the sweeping of the groups of spinneret bits is performed cyclically.

Drawings

FIG. 1 schematically illustrates a front view of an apparatus for carrying out a melt spinning and yarn winding process of the present invention;

FIG. 2 schematically shows a partial side view of an apparatus for carrying out a method of melt spinning and yarn winding according to the invention when the cleaning robot is in the cleaning position and before cleaning is started;

fig. 3 schematically shows a partial side view of an apparatus for carrying out a method of melt spinning and yarn winding according to the invention, when the cleaning robot is in the cleaning position and cleaning has started.

FIG. 4 is a schematic diagram of one embodiment of a machine control device assignment rule for spinning positions;

FIG. 5 is a schematic diagram of another embodiment of the allocation rules of the machine control to the spinning positions in a particular case.

Detailed Description

As shown in fig. 1, the apparatus for carrying out the present invention comprises a spinning device comprising a spinning beam 23 having a heating function. A plurality of spinning positions, of which only two spinning positions 1.1, 1.2 are shown, are held on the underside of the spinning beam 23. In this embodiment, the spinning positions 1.1, 1.2 each comprise five spin packs, corresponding to five spinnerets 1.1.1-1.1.5, 1.2.1-1.2.5. Above the spinning beam 23, two spinning pumps 2 are arranged, which are designed as multi-head pumps. Each spinning pump 2 is connected to one of the spinning positions 1.1, 1.2 via a separate melt line. The melt channel and the spinning positions 1.1, 1.2 are arranged in the spinning beam 23 to ensure that the melt remains molten before being extruded. The molten polyester melt is transported to the spinning pack through the melt pipe under the pressure generated by the spinning pump 2 to extrude the melt from its spinning orifices. The spinning pump 2 for each spinning position is controlled via a spinning pump drive 3. The spinning pump drive 3 is controlled via a spinning pump control unit 4. The melt is extruded to form a continuous filament strand under the cooling action of a cooling device, not shown. The filaments extruded by one of the spinning assemblies are then bundled into a yarn.

For drawing the filament bundle, two godets 7 are provided below the spinning positions 1.1, 1.2. Fig. 1 shows only the godet 7 of the spinning position 1.1. The filament bundle partially surrounds the two godets 7. The godet rollers 7 are driven by godet roller drives 8, respectively.

To receive the drawn filament bundle, a winding device 14 is used to wind the filament bundle at the spinning position 1.1 or 1.2. The winding device 14 is designed with two

bobbin shafts

11, 12. The two

bobbin shafts

11, 12 are held on a rotatable turret 13 so that the

bobbin shafts

11, 12 can be alternately placed in a winding state, thereby ensuring the continuity of the yarn winding. The spool shaft 11 is driven by a spool shaft driver 11.1, and the spool shaft 12 is driven by a spool shaft driver 12.1. The turret 13 is driven by a turret drive 13.1. In order to obtain a cross-wound bobbin, a traversing device 9 is arranged in the inlet area of the winding device 14, the traversing device 9 providing a traversing thread guide for each thread. The traversing gear 9 is driven by a traversing gear drive 9.1. The bobbin shaft driver 11.1, the bobbin shaft driver 12.1, the turret driver 13.1, and the traverse device driver 9.1 are controlled via the winding control unit 15. The winding device of the spinning station 1.2 is not shown in fig. 1, since it is identical to the winding device 14 of the spinning station 1.1.

For controlling and monitoring the drives of the spinning pump 2 and the winding device 14, the device is also provided with a machine control device 16. The machine control device 16 is preferably formed by a microprocessor in the form of a PC. The machine control device 16 is connected to the spinning pump control unit 4 and the winding control unit 15.

The machine control means 16 further comprise a detection unit 17. The detection unit 17 communicates with the winding control unit 15 to obtain data such as the number of windings.

The apparatus for carrying out the invention is further provided with a cleaning robot 19 which is movable in parallel in the arrangement direction of the spinnerets 1.1.1-1.1.5. The cleaning robot 19 is movably arranged on a moving guide rail 20 parallel to the arrangement direction of the spinneret plates 1.1.1-1.1.5. In the non-operating state, the cleaning robot 19 is located at a base station outside the spinning area. This base station is the position that the cleaning robot 19 finally returns after each cleaning operation. The length of the moving rail 20 can be selected to cover all spinning positions of the spinneret. From the front view of fig. 1, the height of the moving guide 20 is lower than the spinneret plate 1.1.1-1.1.5.

Fig. 2 schematically shows a partial side view of the apparatus for carrying out the invention when the cleaning robot 19 is moved to the position of the spinning position 1.1 and before cleaning is started. The cleaning robot 19 is located below the spinning beam 23 and close to the outside, so that the cleaning robot 19 does not interfere with the normally spun filaments during non-cleaning time. Traveling wheels 22 are installed at both sides of the upper end of the cleaning robot 19, and the traveling wheels 22 are driven by a motor, not shown. The travel wheels 22 are driven by a motor to move along the length direction of the moving guide 20. The cleaning robot 19 is provided with a first telescopic arm 25 which can be controlled to be telescopic at one side facing the filament, and a base 26 is arranged at the end part of the first telescopic arm 25. As shown in fig. 3, a second telescopic arm 27 is provided in the base 26 and can be controlled to be telescopic. A cleaning element 21 is arranged at the end of said second telescopic arm 27. The cleaning robot 19 is controlled via a robot control unit 18.

Fig. 3 shows schematically a partial side view of an apparatus according to the invention with a device for melt spinning and yarn winding after the cleaning robot 19 has moved into the position of the spinning position 1.1 and cleaning has started. When the cleaning robot 19 reaches the spinning position to be cleaned, as shown in fig. 3, the first telescopic arm 25 is extended outwards by means of a not shown drive until the cleaning element 21 is pushed into a position directly below the spin pack with the spinning plate 1.1.1. The second telescopic arm 27 is extended upwards by means of a not shown drive to enable the cleaning element 21 to come into contact with the lower surface of the spinneret plate 1.1.1. The cleaning element 21 may preferably consist of a rotatable copper brush and a jet which can spray silicone oil. The cleaning element 21 may be controlled to perform the actions of first scraping, first silicone oil spraying, second scraping, and second silicone oil spraying in sequence.

Preferably, a cleaning robot can be assigned a plurality of cleaning elements 21, the number of cleaning elements 21 being the same as the number of spinning plates of a spinning station. Therefore, the cleaning robot can clean all spinneret plates at one spinneret position at the same time through one-time cleaning.

The cleaning robot is used for cleaning a plurality of spinning positions, wherein one cleaning robot is responsible for cleaning and is divided into a plurality of spinning position groups, and the cleaning robot is used for cleaning the spinning position groups in sequence within a certain cleaning time length. In the exemplary embodiment shown in fig. 4, the cleaning robot 19 takes care of 12 spinning positions in total, each spinning position being 1.1 to 1.12. The spinning positions 1.1-1.12 are assigned to X groups of spinning positions by the machine control 16. Preferably, each spin group includes the same number of spin positions. In this example, all spinning positions 1.1-1.12 are divided into 3 spinning position groups, G1, G2 and G3. Each spinning group comprises four spinning positions, wherein spinning positions 1.1, 1.3, 1.6 and 1.9 are assigned to spinning group G1, spinning positions 1.2, 1.4, 1.11 and 1.12 are assigned to spinning group G2, and spinning positions 1.5, 1.7, 1.8 and 1.10 are assigned to spinning group G3.

Of course, the spinning positions may be distributed in other reasonable ways according to the needs of the user of the machine, and are not limited to the uniform distribution mode.

Assuming that all spinning sites need to be swept once a day, the duration of each set of sweeps is Y, which is preferably the same. In this example, Y is 8 hours.

The machine control device 16 and the robot control unit 18 are connected to a shared ethernet network so that the machine control device 16 can control the cleaning robot 19 in the aforementioned distributed manner. The specific control mode is as follows: during the first 8 hours, the cleaning robot 19 is controlled to clean all spinning positions of the spinning group G1 in sequence, namely the spinning positions 1.1, 1.3, 1.6 and 1.9. In the next 8 hours, the cleaning robot 19 cleans all spinning positions of the spinning position group G2 in sequence. In the next 8 hours, the cleaning robot 19 cleans all spinning positions of the spinning position group G3 in sequence. Within 24 hours, all 12 spinning positions 1.1-1.12 have undergone one sweep. Thereafter, the cycle was repeated for the first 24 hours of cleaning.

Therefore, if the time interval from the end of a sweep to the next sweep for a spin position is defined as the sweep period and the sweep period value is Z, then the sweep period value Z for each spin position ranges from "X Y-Y" to "X Y + Y" based on the control scheme described above.

Taking the spinneret group G1 as an example, in a cleaning duration Y of the spinneret group G1, the cleaning robot 19 cleans the spinneret positions 1.1, 1.3, 1.6, and 1.9 according to a preset sequence. In certain cases, the cleaning robot 19 can adjust the cleaning sequence of one or more of the spinning positions under the control of the machine control device 16. The special cases specifically include: 1. two or more spinning positions need to be cleaned by the cleaning robot 19 at the same time; 2. the detection unit 17 of the winding control unit 15 detects that the winding times of the winding device 14 corresponding to a certain spinning position reach a set value or the yarn breaking sensor detects that the yarn breaking times reach a preset value, and the cleaning is needed in a short time; 3. two or more spinning positions are concentrated in one cleaning time length Y and need to be cleaned when the cleaning time length Y is about to end.

Upon encountering the first particular situation, the machine control device 16 may activate a warning light, indicating operator intervention, simultaneously with the cleaning by the cleaning robot 19.

In the face of the second particular case, the machine control device 16 can treat such spinning positions as the spinning positions with higher priority. For example, when the second special condition mentioned above occurs at spinning position 1.9, the machine control device 16 preferably advances its sweeping time to the first one in the present sweeping time period Y, i.e., before the order of spinning positions 1.1.

In the face of the third particular case, the machine control 16 can adjust such spinning position to within the next sweeping time period Y. As shown in fig. 5, the machine control device 16 pushes the spinning position 1.9 in the spinning group G1 back to the cleaning duration Y of the spinning group G2 for cleaning. In the next cycle, the spinning position 1.9 is cleaned back into the cleaning time Y of the spinning group G1 to which it belongs, which is allocated by the machine control device 16. The machine control 19 is thus arranged to allow for push-back cleaning between adjacent cleaning periods Y in the third particular case.

The cleaning robot has the outstanding characteristic that the cleaning robot is used for automatically cleaning the spinneret plate in a mode of meeting the technical characteristics of melt spinning.

Claims

1. A method of melt spinning and winding a yarn, a polymer melt being fed by a plurality of spinning pumps to a plurality of spin packs at a plurality of spinning positions, said spin packs extruding said polymer melt into a plurality of yarns, respectively, said yarns being wound into a plurality of bobbins, wherein one of said spinning positions comprises a plurality of said spin packs,

the cleaning robot is controlled by the machine control device to clean the spinning components of the spinning positions, wherein a plurality of spinning positions which are taken for cleaning by one cleaning robot are divided into a plurality of spinning position groups, the cleaning robot cleans the spinning position groups in sequence within a certain cleaning time period respectively,

the cleaning sequence of the spinning positions can be adjusted under the control of the machine control device.

2. The method of claim 1, wherein said machine control activates a warning light when said machine control detects that a set number or more of said spinning positions need to be cleaned at the same time within the cleaning duration of one of said spinning position groups.

3. The method of claim 1, wherein the machine control device detects the number of yarn breakage or doffing and adjusts the cleaning sequence of the spinning positions according to the detection result.

4. The method of claim 1, wherein said machine control means adjusts the sequence of cleaning of one or more of said spin positions when said machine control means detects that a set number or more of said spin positions need to be cleaned within the duration of cleaning of one of said spin position groups.

5. The method of claim 4, wherein when said machine control means detects that a number greater than or equal to a predetermined value of said spinning positions need to be cleaned during a cleaning period of one of said spinning position groups, said machine control means advances or advances the cleaning sequence of said spinning positions that need to be cleaned during said cleaning period.

6. The method of claim 4, wherein said machine control means is operable to push said spinning position to be cleaned near the end of said cleaning period back to the next adjacent cleaning period when said machine control means detects that said spinning position is to be cleaned at a number greater than or equal to a predetermined value near the end of said cleaning period when said machine control means detects that said spinning position is to be cleaned near the end of said cleaning period.

7. The method according to any one of claims 2, 4, 5, and 6, wherein the set value number is two or more.

8. The method of any of claims 1-6, wherein the sweep period value for each spin bit is set to Z, the group count value for the spin group is set to X, and the sweep duration value for each spin group is the same and set to Y, wherein Z ranges from "X Y-Y" to "X Y + Y".

9. The method of any of claims 1-6, wherein the sweeping of the plurality of spin-pack groups is performed cyclically.