CN106149110B - Method for the admission of a large number of threads at a workstation of a rotor spinning machine and device for carrying out the method - Google Patents

Abstract

The invention relates to a method for spinning a plurality of incoming yarns at workstations of a rotor spinning machine, wherein after spinning is stopped at a workstation, workstation preparation for the incoming spinning is carried out and subsequently the yarns are spun at the workstation simultaneously or in groups or individually within a short time interval, whereby each workstation comprises a feed device (20) for the fibers to a spinning rotor (21), the spinning rotor (21) being located in a spinning unit (2) below a drawing mechanism (4) for the yarn (1), above which drawing mechanism (4) a compensator (6) for the length of the yarn and a winding device for the yarn (1) are located.

Description

Method for mass spinning entry at a workstation of an open-end spinning machine and for performing the same means of method

technical field

The present invention relates to a method of mass spinning incoming yarns at a work station of an open-end spinning machine, wherein after stopping the spinning incoming at the work station, a work station preparation is performed for the spinning incoming and subsequently The yarns are spun simultaneously or in groups or individually in short time intervals at work stations, wherein each work station comprises means for feeding the fibers to a spinning rotor located at the drawing mechanism of the yarn In the lower spinning unit, a compensator for the yarn length and a winding device for the yarn are arranged above the pulling mechanism.

Background technique

After a stoppage when the machine is already spinning and the yarn is therefore in the draw tube or the yarn has to be inserted into the draw tube manually or automatically (for example after a stop of the machine due to interruption of the power supply or malfunction of the machine etc.) Group (mass) spinning entry of yarn at the workstation of the open-end spinning machine is used when the machine is started. These are the cases when the spinning entry process is interrupted at several workstations.

During the entry of a large amount of spinning, the spinning rotor needs to be cleaned (eg cleaning of the rotor is performed only by spinning the remaining material out after stopping the feed, so that the ends of the spun yarn will remain in the draw tube and in the rotor There will be as few fibers as possible) and other parts of the workstation will be cleaned if necessary. The end of the yarn is stopped in the pulling tube, thereby stopping the end of the yarn at the station where the failure occurs in the pulling tube (ie the end of the yarn is withdrawn from the pulling tube for some reason), The end of the yarn is directed back to the pulling tube. This is performed by detecting that the end of the yarn is being wound on the bobbin to leave the end of the yarn at each station of the drawing tube or at a station that is not spinning when the machine is stopped, where the yarn remains The length unwinds where due and directs the yarn at each station to the path for spinning entry. Thereafter, the process of mass spinning entry starts when, for a row of workstations, new fibres are fed to the spinning rotors and at the same time the ends of the yarns slowly enter onto the collecting grooves of the spinning rotors, which means Its spinning in. After the entry of the spinning of the yarn at the workstations, the extraction of the yarn from the spinning unit at these workstations begins and the winding of the yarn onto the bobbin begins.

The disadvantage of the background art lies especially in the fact that if the spinning entry is performed manually by the operator, it is time-consuming and also laborious, since current machines have dozens of workstations arranged in a row next to each other. Another disadvantage is the fluctuating quality of the piecing, which depends on the current state of the yarn ends in the draw tube.

The aim of the present invention is to eliminate or at least minimize the disadvantages of the background art, in particular to shorten the preparation time for a large number of spinning entries and to make the operation less demanding if manual operation occurs, especially after a large interruption of the spinning (for example after a machine break) after electricity, after a machine failure, etc.). Also, the object of the present invention is to enhance the efficiency of the spinning entry process and the quality of the piecing.

SUMMARY OF THE INVENTION

The object of the present invention is achieved by a method for mass spinning incoming yarns at the workstations of an open-end spinning machine, the principle of the present invention is that before the actual process of spinning incoming, the drive of the spinning rotor is started and will be The end of the yarn at the workstations is returned to the spinning rotor in one or several steps of the yarn pulling mechanism, which results in tearing off the weakened end of the yarn and pulling the end of the yarn at all workstations. shortened to about the same length, where the spinning rotor is stopped while the tear-off end of the yarn is sucked out of the spinning rotor by the process gas, and then the drive is started for operation by the pulling mechanism that reverses the yarn to perform the spinning entry of the workstation.

This method can effectively shorten the machine preparation for a large number of spinning feeds.

The actual process of spinning in can be performed while reducing the number of revolutions of the rotor (50-100% of the number of rotor revolutions (set for the actual process of spinning out)) in order to increase the efficiency of the spinning in, and in the whole machine or machine After the spinning of the side (group=several segments) has entered, the spinning parameters are automatically set to the desired values.

Description of drawings

The invention is schematically represented in FIG. 1 .

Detailed ways

The method according to the invention for mass spinning into yarn at a work station of an open-end spinning machine will be described with reference to an exemplary embodiment of a work station of an open-end spinning machine having: a pulling mechanism for the yarn the individual drives of the individual drives; the individual drives of the means of feeding the fibers to the spinning rotor in the spinning unit, which is located below the pulling mechanism of the yarn; and the vacuum compensator for the length of the yarn, which It is arranged between the yarn pulling mechanism and the yarn winding device. An open-end spinning machine comprises at least one row of identical workstations arranged adjacent to each other, but generally it comprises two parallel rows of identical workstations.

The spinning unit 2 is provided at its fiber inlet or more specifically the sliver inlet with a fiber feeding device 20 driven by a stepper motor, which constitutes a separate drive of the fiber feeding device 20 . After the feeding device in the direction of fiber flow, the spinning unit 2 is equipped with a spinning rotor 21 from which a drawing tube 22 of the yarn 1 draws the produced yarn 1 . The spinning unit 2 is provided with a cover 23 which can be opened and closed repeatedly, in particular to allow removal of unwanted fibers.

The pulling mechanism 4 of the yarn 1 leaving the spinning unit 2 comprises a pair of pulling rolls 41, 42, one of which is formed by a fixed pulling roll 42 and the other is formed by a tiltable pulling roll 41, the pulling roll 41 Self-fixing pulling rollers 42 are mounted reversibly and tiltably in the configuration of the workstation. At least one of a pair of pulling rollers 41 , 42 is coupled to a separate drive, which in the embodiment shown consists of a BLDC motor M or a stepper motor M.

In the direction of movement of the produced yarn 1 , the winding device of the yarn 1 is located behind the yarn pulling mechanism 4 , the winding device comprising a winding drum 7 and a not-shown rotation for holding the bobbin 3 . Spool arm, the resulting yarn is wound onto spool 3. The winding drum 7 is continuous along the entire length of the machine and is common to the entire row of workstations arranged adjacent to each other, or each workstation is equipped with an independent winding drum 7 with individual drives, ideally of configuration A separate drive into the inner space of the cylindrical housing which is in contact with the spool and constitutes the rotor of the separate drive of the spool 3 .

The spool arm is aligned with means not shown for raising the spool arm, which means that the spool 3 is moved away from the winding drum 7 and is no longer driven by it. The spool 3 is also aligned with not shown means for braking the rotation of the spool 3 in the raised position which minimizes or otherwise affects the period of inertial rotation of the spool after raising the spool arm.

In front of the winding device of the yarn 1 is arranged a traversing device of the yarn 1, not shown, which traverses the wound yarn across the width of the bobbin 3 so that the bobbin 3 is on the bobbin 3 when it rotates A package of yarn 1 is formed.

A compensator 6 for the length of the yarn 1 is located between the traversing device (not shown) of the yarn and the pulling mechanism 4 of the yarn 1 . In the embodiment shown, the compensator 6 is formed by a vacuum compensator connected to a vacuum source. In a not shown example of embodiment, the compensator 6 consists of a mechanical compensator, eg a compensator with a magnetically, electromagnetically or mechanically controlled (eg spring-loaded) rotating arm.

The workstation is also provided with a control mechanism 5, which controls the operation of the various parts of the workstation by itself or with the help of not-shown control mechanisms for machine sections (ie groups of workstations) or with the help of a central control mechanism for the entire machine. operations, their cooperation with each other, and the sequence of steps, etc. In terms of optimization of the control process, the control mechanism 5 of a particular station controls the individual drives of the various components of each station, such as the drive of the fiber feeding device 20, the drive of the pulling mechanism 4, the drive of the mechanism for bobbin lifting Drives, winding drives, etc., so that the drives common to several workstations (so-called central and/or group drives) are controlled by the control mechanism of the group of workstations (sections of the machine) and/or by the central control mechanism of the entire machine. The compensator 6 for the length of the yarn 1 at the work station is controlled by the control mechanism of the group of work stations (sections of the machine) and/or by the central control mechanism of the whole machine and/or by the control mechanism 5 of each specific work station.

The practical approach to the mass spinning entry process, which is the subject of the present invention, consists in, first of all, the preparation of the workstations to restart spinning, i.e. mass spinning, after power failures, shutdowns, etc. or interruption of yarn production in relation to the machine group Enter.

According to an exemplary embodiment of the present invention, the preparation of a workstation for restarting spinning with a large number of spinning entries following an interruption in the production of a group of yarns includes a controlled (ie smooth) but as rapid as possible stopping of the machine The operation of the various components of the workstations, whereby the ends of the yarns 1 at the various workstations remain in the spinning unit 2 , ie in the spinning rotor 21 or in the drawing tube 22 . At the same time, the yarn 1 remains in the compensator 6, wherein the compensator 6 forms a reservoir for the yarn 1 . At the same time, the spool arm with the spool 3 is raised at the work station and the rotation of the spool 3 is stopped in a controlled manner. After the controlled stop of the workstation, the ends of the yarn 1 remaining in the spinning unit 2 are weakened.

According to another embodiment of the invention, the preparation of the workstations for restarting the spinning with a large number of spinning entries is carried out, whereby manual and/or automatic and/or manual and/or automatic and/or manual and/or automatic and/or manual operation of the workstations of the machine after interruption of the production of a group of yarns is carried out. or semi-automatic maintenance, during which the ends of the yarn 1 on the bobbin 3 are detected successively at the various workstations where the yarn 1 is guided to the working path, including into the compensator 6 and to the yarn 1 in the pulling mechanism 4. The free end of the yarn 1 is inserted into the drawing tube 22 of the spinning unit 2 .

Once the preparation of the machine's workstations for spinning entry (bulk spinning entry, group spinning entry, etc.) is complete, the process air (vacuum) is turned on to restore power etc., which can bring the machine back into operation, whereby The process air (vacuum) sucks out any remaining fibers or torn ends of the yarn 1 from the spinning unit 2 , in particular from the spinning rotor 21 .

Subsequently, the driving of the spinning rotors 21 of the respective stations is turned on. As soon as the rotor 21 starts to rotate, the end of the yarn 1 is returned to the various workstations in one or several successive steps by the reverse movement (rotation) of the pulling rollers 41, 42 of the yarn 1, until returning to the rotor 21, wherein The weakened ends of the yarn 1 are in contact with the respective spinning rotors 21, which leads to tearing of these weakened ends of the yarn 1 at the respective workstations. In this way, the length of each end of the yarn 1 becomes approximately the same at each station in the spinning unit, and at the same time the weakened end of the yarn is removed. The end of the yarn 1 is thus prepared for spinning into the spinning entry end of the yarn 1 as the respective spinning unit.

After the spinning rotor 21 is stopped, the supply of process air (vacuum) is thereby restarted and the torn weakened end of the yarn 1 and any remaining impurities are sucked out of the spinning unit 2 .

In order to improve the spinning entry, when the supply of process air is restored, as already mentioned above, and the spinning rotor 21 is stopped, a sliver preparation for the spinning entry is also optionally carried out, here activated for a short period of time The fibre feeding device 20 and all fibres separated from the sliver are sucked out together with the torn weakened end of the yarn 1 .

After the spinning unit 2, the rotation of the spinning rotor 21 is restarted, as is the drive of the work station and other parts of the machine, such as the winding and traversing devices, etc. Subsequently, the actual bulk (group) spinning entry of the yarn is carried out by reversing the pulling mechanism 4 of the various stations, activating the fibre feeding device 20 and starting the winding of the yarn onto the bobbin 3, during which the bobbin 3 is slow Enter slowly onto the winding drum 7 . After a large number of spinning entries are performed in this way, the spinning process at the workstation is restarted.

In order to eliminate or at least reduce the current peaks that occur due to the simultaneous activation of multiple electric drives (especially the drives of the feed and drawer) during a large number of spinning entries, the total number of stations being spun in is divided into smaller Groups and then the spinning entry operations at the workstations of the entire machine take place successively in the various groups of workstations (this is the so-called group spinning entry) or even singly in succession (one single workstation followed by another), whereby the spinning The delay time interval for the initiation of the yarn entry process is set between individual spinning entry operations.

Industrial Applicability

The present invention can be used in the textile industry - both for the production of machines and for the production of yarns.

Claims (5)

1. Method for mass spinning of an incoming yarn at a workstation of a rotor spinning machine, wherein after stopping spinning at a workstation, workstation preparation for spinning entry is performed and then yarn is spun in at the workstation simultaneously or in groups or individually within a short time interval, wherein each workstation comprises a fiber feeding device (20) for fiber to a spinning rotor (21), which spinning rotor (21) is located in a spinning unit (2) arranged below a pulling mechanism (4) of the yarn (1), above which pulling mechanism (4) a compensator (6) for yarn length and a winding device of the yarn are located, characterized in that, prior to the spinning entry operation itself, the driving of the spinning rotor (21) is started and the end of the yarn (1) at each workstation is returned to the spinning rotor (21) within one or several steps of the pulling mechanism (4) of the yarn (1), this results in tearing off the weakened end of the yarn (1) and shortening the end of the yarn (1) to about the same length at all stations, where the spinning rotor (21) is stopped while the torn off end of the yarn (1) is sucked out of the spinning rotor (21) by process air, and subsequently the drive is started to perform the spinning entry of a station by operation of the pulling mechanism (4) reversing the yarn (1).

2. Method according to claim 1, characterized in that after shortening the ends of the yarn (1) to about the same length at all the stations, the preparation of the ends of the sliver is performed by activating said fiber feeding means (20) of the fibers for a short time and sucking out the separated fibers by the process air.

3. Method according to claim 1, characterized in that the individual drives of the individual components of each work station are controlled by the control means (5) of each specific work station, whereby the drive common to a plurality of work stations is controlled by the control means of the group of work stations and/or by the central control means of the entire machine, and that the compensator (6) for the length of the yarn (1) at the work stations is controlled by the control means of the group of work stations and/or by the central control means of the entire machine and/or by the control means (5) of each specific work station.

4. A method as claimed in any one of claims 1 to 3, characterised in that a reservoir of yarn (1) is formed in the compensator (6) for the length of yarn (1) at the machine stop or before the start of the drive of the spinning rotor (21).

5. A method as claimed in any one of claims 1 to 3, characterised by stopping the weakened end of the yarn (1) in the spinning unit (2) by stopping the various components of the working stations of the machine in a controlled manner before starting the drive of the spinning rotor (21).

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