EP2801646A1 - Method for operating an open ended rotor spinning machine - Google Patents

Abstract

The invention relates to a method for operating an open-end rotor spinning machine (1), which has a plurality of workstations (4) each having a spinning device (5) with a rotor housing (21) which can be pressurized under vacuum, in which a spinning rotor (23) with high Rotates speed, for the production of a thread (16) and a winding device (7) for producing a cross-wound bobbin (18), wherein the connection of the jobs to a central vacuum supply can be switched off. According to the invention it is provided that the pressurization of the rotor housing with negative pressure on the spinning devices that produce yarn as well as the spinning devices that spin newly is limited.

Description

The invention relates to a method for operating an open-end rotor spinning machine having a plurality of jobs, each having a spinner with a unterdruckbeaufschlagbaren rotor housing in which a spinning rotor rotates at high speed, for producing a thread and a winding device for producing a cross-wound bobbin , wherein the connection of the jobs to a central vacuum supply is switched off.

Open-end rotor spinning machines have long been known and usually consist of a plurality of juxtaposed in series, similar jobs. In addition, they have a central control device and a spinning machine's own vacuum system. Each of these jobs has a spinning and a winding device, where the sliver presented in a sliver can be spun into a yarn and wound into a cheese.

The presented sliver is fed by means of a sliver feed cylinder of the opening roller, which dissolves the sliver in individual fibers with their clothing and transported to Faserleitkanal the spin box. The fiber transport is supported by the existing in the rotor housing vacuum, which generates an air flow in the fiber guide, dissolves the fibers from the Auflösegarnitur and transported via the so-called channel plate adapter targeted in the spinning rotor. As a result of the centrifugal acceleration, the fibers slip into the collection groove of the spinning rotor, where they are collected, drawn off axially through the draw-off nozzle in the axis of rotation and thus turned into a yarn which is wound onto a cross-wound bobbin.

After a stoppage of the rotor spinning machine or after a thread break the spinning process must be resumed. For so-called piecing the thread end is guided against the Garnabzugsrichtung in the thread withdrawal tube of the spinning chamber and sucked by the negative pressure in the rotor housing. The cheese is pivoted down, that is, brought back into contact with the bobbin drive roller and as soon as the yarn end, the collecting groove of the spinning rotor respectively reached fiber ring, the thread end breaks the fiber ring and the spinning process can be continued.

By the EP 0 529 312 B1 discloses an open-end rotor spinning machine having in the suction line for generating the spinning vacuum in the rotor housing via a valve with quick exhaust. By means of the valve, the aspiration of the rotor housing is interrupted before piecing. As a result, the fibers are not, as usual during the spinning process, sucked through the fiber guide channel, but through the suction opening of the opening roller. With the insertion of the thread end into the spinning rotor and by opening the valve, the rotor housing is again subjected to negative pressure. Timed to match the suction is completed by the suction opening of the opening roller. By this deflection of the fiber flow during piecing a uniform piecemeal is to arise.

The DE 10 2006 037 849 A1 discloses an open-end spinning machine and a method for controlling an open-end spinning machine during a piecing operation when re-spun a thread or after a thread break. Based on the fact that the Neuanspinnen after closing the housing by means of so-called scavenging the rotor interior of subsequently introduced and there accumulated impurities is cleaned, that each spinning station requires its own scavenging and that the Anspinnautomaten / maintenance facilities additionally appropriate connections for introducing the scavenging air must have a re-spinning of the yarn with reduced device and procedural effort to be made possible.

This is done according to the DE 10 2006 037 849 A1 immediately interrupted at a stop of the sliver feeding or after a predetermined period of time applied in the housing vacuum. As a result, it is prevented that the sliver end is attracted by the continuing inflowing air to the opening device and that an undesirable suction of impurities occurs before closing the housing of the spinning station. In addition, energy can be saved in this way, since a considerable amount of false air is sucked into the machine at the adjacent negative pressure through the open housing, which in turn would lead to an increase in pressure within the printing system.

A disadvantage of the methods and devices according to the prior art, however, is that the rotor housing of the individual workstations are permanently subjected to negative pressure, except for the piecing process or the associated cleaning process.

This has a negative effect especially after a machine restart or startup after a power failure. Since all jobs are subjected to negative pressure and for piecing additional facilities such as the suction nozzle to seize the upper thread or a pneumatic yarn storage are used, which also require negative pressure, the total available negative pressure is reduced. Therefore, in a rotor spinning machine with autonomously spinning spinning stations only 12 spindles can spinn at the same time, for example, because the vacuum for more jobs for piecing including the necessary additional equipment is not sufficient.

Based on the aforementioned prior art, the present invention seeks to develop a method that optimizes the vacuum consumption of an open-end rotor spinning machine.

This object is achieved by the characterizing features of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

To achieve the object is provided according to claim 1, that the pressurization of the rotor housing with negative pressure on the spinning devices that produce yarn and the spinning devices that spin newly limited.

The advantages achieved by the invention are, in particular, that the vacuum necessary for spinning is only made available to the spinning devices of the individual workstations when the respective workstation produces yarn or recoils a thread.

Heretofore, in practice, the vacuum is constantly supplied to all the spinning devices, regardless of whether the spinning device produces yarn. But as often a part of the spinning devices are not produced, for example due to thread interruptions, cheese change or not all jobs are occupied, the negative pressure supply is ineffective according to the prior art.

Especially after a machine start or run-up after a power failure, the negative pressure for spinning is needed only for the to be started and the already producing jobs.

Using the present invention, the machine can be started up faster. Since only the spinning stations are subjected to negative pressure, which actually spindle, according to the invention can now spin more spinning stations at the same time. While up to now spinning machines could spin on about 12 spinning stations at the same time, with the method according to the invention more than 20 spinning stations are involved. In this way, the efficiency of the open-end rotor spinning machine is achieved faster.

Furthermore, there is an optimized, demand-adjusted vacuum consumption for an open-end rotor spinning machine. Optimizing suction performance can reduce energy consumption and associated costs without compromising machine productivity or yarn quality. Especially at present, where energy costs account for a not inconsiderable share of operating costs, consumption reduction is an important tool to produce more economically. In addition, the lower energy consumption protects the environment.

According to claim 2 is provided in an advantageous embodiment that, depending on the number of jobs that are supplied with negative pressure, the regulation of the total machine vacuum takes place.

Through the valve in the suction line for generating the spinning vacuum in the rotor housing of the total intake cross-section of the ventilation system is limited to the necessary level, which in turn leads to an increase in the system vacuum. With appropriate control of this increased negative pressure by reducing the fan speed back to a previously set Pressure value can be reduced. The speed reduction leads to an overall reduced power consumption.

As described in particular in claims 3 and 4, the application of negative pressure to the rotor housing is done individually for each individual job or in groups for several jobs.

Because of these flexible possibilities, for example, a single stationary work site may be exempted from the pressurization of the rotor housing, although it is surrounded by yarn producing work sites. It may also be useful to switch non-working groups of jobs. Depending on requirements, these can be sections or section pages. For example, if the open-end rotor spinning machine temporarily only produces on the work sites of one side of the machine, then the entire side whose work stations are stationary can be excluded from the vacuum supply. This would be possible for example by an additional branch of the vacuum duct system, which applies negative pressure to the sections or machine sides.

According to claims 5 and 6 is advantageously also provided that a direct or a derived signal initiates the application of negative pressure to the rotor housing.

To control the valve to shut off the vacuum on the rotor housing, either direct signals, such as the message of a "thread breakage" or "machine startup" or derived signals such as "coil withdrawal" can be processed. Upon receipt of such a signal, the valve is actuated and the vacuum is no longer delivered to the rotor housing.

The invention is explained in more detail with reference to an embodiment shown in the drawings.

Figur 1

eine Offenend-Rotorspinnmaschine;

Figur 2

schematisch, in Seitenansicht, eine Offenend-Spinnvorrichtung mit einem in einem unterdruckbeaufschlagbaren Rotorgehäuse umlaufenden Spinnrotor und einer Faserband-Auflöseeinrichtung, die über einen Faserleitkanal mit dem Rotorgehäuse verbunden ist.

It shows:

FIG. 1

an open-end rotor spinning machine;

FIG. 2

schematically, in side view, an open-end spinning device with a rotatable in a unterdruckbeaufschlagbaren rotor housing spinning rotor and a sliver-opening device, which is connected via a Faserleitkanal with the rotor housing.

The FIG. 1 schematically shows a front view of an open-end rotor spinning machine 1. The open-end rotor spinning machine 1 has a plurality between two end frames 2 and 3 arranged, largely self-sufficient jobs 4. The end racks 2, 3 of this open-end rotor spinning machine 1 are, as known and therefore not shown in detail, connected through continuous supply and disposal channels, for example a vacuum channel for supplying the arranged in the field of jobs 4 spinning devices 5 with spinning vacuum, an electronic channel for a bus system 13 and a cable channel for supplying the work stations 4 with electrical energy. At these supply and disposal channels, which are quasi the "backbone" of the open-end rotor spinning machine 1, the yarn-forming and winding devices of the workstations 4 are defined on job site housing 6.

For example, the workstation housings 6, which are detachably arranged on the supply and disposal channels, each have a spinning device 5, a winding device 7, and a workstation-specific control device 8.

In the end frame 3 a textile machine's own vacuum source 9 is arranged, while in the end frame 2 a (not shown) electrical power supply and a central control unit 10 of the open-end rotor spinning machine 1 is integrated.

The central control unit 10, which has a memory device 20 via a computer device 12, is connected to the control devices 8 of the individual workstations 4 via a bus system 13 or the like. The central control unit 10 further has an operating unit 17. By means of the operating unit 17, it is possible to input and display parameters which are required for controlling the open-end rotor spinning machine 1 and the work stations 4. For this purpose, the operating unit 17 has a keypad-shaped device 11 for inputting the parameters and a display means 19 designed as a screen. The screen 19 can also be designed as a touchscreen and thus additionally assume the input function. Such a Above all, touchscreen is ideal for making a selection within a menu. The entered parameters are stored in the memory 20 of the computer device 12. Furthermore, the memory 20 contains information as to which parameters are to be set for a specific type of change in the mode of operation of the open-end rotor spinning machine 1. For this purpose groups of parameters are assigned to the modes of change of the method of operation.

How out FIG. 1 can be seen on the numerous jobs 4 each by means of the spinning device 5, a master fiber tape 14, which is stored in sliver cans 15, which are positioned in series next to each other below the jobs 4, spun into a thread 16, which then on the winding device 7 to a cross-wound bobbin 18 is wound up.

In the FIG. 2 shown spinning device of an open-end rotor spinning machine 1 carries a total of the reference number. 5

Such spinning devices 5 have, as is known, a rotor housing 21 in which the spinning cup 22 of a spinning rotor 23 rotates at high speed.

In the spinning device 5 according to the present embodiment, the spinning rotor 23 is supported with its rotor shaft 24 in the bearing gusset of a preferably axially thrust-free support disk bearing 25.

The spinning rotor 23 is thereby driven by a machine-tangential belt 26, which is made by a pressure roller 27 to the rotor shaft 24.

The axial positioning of the rotor shaft 24 in the Lagerzwickel the support disk bearing 25 is preferably carried out via a permanent magnetic thrust bearing 28th

In an alternative embodiment, the spinning rotor 23 could of course also be driven by a single motor and, for example, be supported without contact in a permanent magnet bearing.

The rotor housing 21, which is open towards the front, is closed by a pivotably mounted cover element 29 during the spinning operation and via a Suction channel 30 connected to a vacuum source 9, which generates the necessary spin pressure in the rotor housing 21 during the spinning process.

The cover element 29 has a channel plate 31 with a seal 32 preferably positioned in an annular groove.

In a central bearing receptacle 33 of the channel plate 31 is also, as known interchangeable a channel plate adapter 34 is arranged, which has the mouth region of a Faserleitkanals 35.

Furthermore, the channel plate adapter 34 is equipped with a yarn draw-off nozzle 36 and on the output side with a yarn draw-off tube 37.

As in FIG. 2 is further shown on the lid member 29 which is rotatably mounted limited to a pivot axis 38, an opening roller housing 39 and the opening roller housing 39 is integrated in the lid member 29, the further rear bearing brackets 40, 41 for supporting an opening roller 42 and a sliver feed cylinder 43 has.

The opening roller 42 is thereby driven in the region of its whorl 44 by a rotating, machine-long tangential belt 45, while the drive (not shown) of the sliver feed cylinder 43 preferably via a worm gear arrangement, which is connected to a machine-length drive shaft 46.

In an alternative embodiment, individual motor drives for the opening roller 42 and / or the sliver feed cylinder 43 can of course also be provided here.

During the regular spinning process, the yarn 16 produced in the vacuum-pressurized spinning device 5 is drawn off by the yarn draw-off device and then wound up on the winding device 7 to form a cross-wound bobbin 18.

At the same time, the thread 16 coming to the reel is laid by means of the thread-changing device (not shown) in such a way that it runs onto the lateral surface of the cross-wound bobbin 18 in crossing positions.

Occurs at one of the jobs 4 of the open-end rotor spinning machine 1, for example, a thread break, this is detected by the thread monitor, the spinning process is interrupted and stopped the relevant job 4.

More specifically, the drive of the sliver feed cylinder 43, to interrupt the fiber feed to the opening roller 42 and thus ultimately into the spinning rotor 23 off and initiates the lifting of the cheese 18 from the bobbin drive roller, so that the yarn end 16 can not einwalken in the cheese surface 18.

At the same time, the solenoid valve 50 receives a corresponding signal. Thereafter, the solenoid valve 50 turns and the passage between the pressure line 48 and the pressure line 49, which is connected to a loop 51, is opened. The ring line 51 acts on a plurality of jobs 4 with overpressure. The compressed air from the ring line 51 flows through the pressure lines 48 and 49 in the pinch valve 47 and closes the pressure line 30. The rotor housing 21 is no longer subjected to negative pressure.

Since the thread end 16 is usually pulled out of the spinning box due to the high winding speed after the yarn breakage, the thread end 16 has to be found on the raised from the bobbin drive roller cross-wound bobbin 18 and some layers are unwound.

After the thread end 16 has been prepared for the subsequent piecing and a pieceable fiber tuft has been produced at the thread end 16, the thread end 16 has to be introduced against the normal withdrawal direction through the thread withdrawal tube 37 and the withdrawal nozzle 36 in the direction of the spinning rotor 23. After the control device of the workstation 4 has been activated via an unillustrated switching element, the magnetic valve 50 receives the signal to close. Thereupon, the pinch valve 47 opens and the pressure in the pressure line 48 decreases. The rotor housing is again subjected to the necessary negative pressure for spinning.

At the same time the sliver feed cylinder 43 is driven and the sliver 14 again the opening roller 42 and thus the spinning rotor 23 is supplied, in whose Collecting due to the high centrifugal acceleration again forms a fiber ring. The prepared thread end 16 slides into the rotor groove.

In the spinning rotor 23 there is again negative pressure, which sucks the yarn end 16 into the spinning rotor 23, so that the prepared yarn end 16 connects to the fiber ring in the collecting groove of the spinning rotor 23. At the same time, the creel lowers until the cross-wound bobbin 18 again lies on the bobbin drive roller and the newly emerging thread 16 is wound onto the cross-wound bobbin 18.

If a machine restart or a run-up after a power failure, the control devices of the first twenty jobs 4 are activated via switching elements, not shown. Then close at these twenty jobs 4, the corresponding solenoid valves 50 and the pinch valves 47 open. As a result, the pressure in the pressure lines 48 of the respective work stations 4 decreases and the selected work stations 4 are subjected to sufficient negative pressure, so that new threads can be spun. After the first twenty jobs have 4 completed the piecing process, the next twenty jobs 4 can be applied for spinning with negative pressure.

Claims (6)

A method for operating an open-end rotor spinning machine (1), which has a plurality of jobs (4), each via a spinning device (5) with a unterdruckbeaufschlagbaren rotor housing (21) in which a spinning rotor (23) rotates at high speed to Production of a thread (16) and a winding device 7 () for producing a cross-wound bobbin (18), wherein the connection of the work stations (4) to a central vacuum supply is switched off,
characterized,
that the pressurization of the rotor housing with negative pressure on the spinning devices that produce yarn as well as the spinning devices that spin newly is limited. A method according to claim 1, characterized in that , depending on the number of workstations (4), which are supplied with negative pressure, the control of the total machine vacuum takes place. A method according to claim 1, characterized in that the application of negative pressure to the rotor housing (21) takes place individually for each individual workstation (4). A method according to claim 1, characterized in that the application of negative pressure to the rotor housing (21) in groups for several jobs (4). A method according to claim 1, characterized in that a direct signal initiates the application of negative pressure to the rotor housing (21). A method according to claim 1, characterized in that a derived signal initiates the application of negative pressure to the rotor housing (21).

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