EP3636811A1 - Open-end spinning device and method for checking a mounting condition of a spinning rotor of an open-end spinning device - Google Patents

Abstract

In a method for checking an assembly state of a spinning rotor (2), the spinning rotor (2) is mounted in a magnetic bearing (6) in an open-end spinning device (1) that can be closed with a cover element (7) on the front. The spinning rotor (2) comprises a rotor shaft (3) with a shoulder (5) and a rotor cup (4) detachably connected to the rotor shaft (3), and the magnetic bearing (6) has means for adjusting an axial position of the rotor shaft (3) for detecting the axial position and at least one front axial catch bearing (10) for the shoulder (5) of the rotor shaft (3). A first distance (s0) between the shoulder (5) of the rotor shaft (3) and the front axial catch bearing (10) is defined for a regular axial operating position (11) of the spinning rotor (2). Before starting the spinning rotor (2), the spinning rotor (2) is moved axially in the direction of the front axial catch bearing (10) until it reaches an axial stop, and a first travel path (s) of the spinning rotor (2) between the regular axial operating position (11) and the axial stop is detected. The detected first travel path (s) is compared with the first distance (s0) and the spinning rotor (2) is started if s = s0 and the spinning rotor (2) is prevented from starting if s <s0. A corresponding open-end spinning device (1) has a control device (15) which is designed to carry out the method.

Description

The present invention relates to a method for checking an assembled state of a spinning rotor, which comprises a rotor shaft with a shoulder and a rotor cup detachably connected to the rotor shaft. The spinning rotor is mounted in a magnetic bearing in an open-end spinning device which can be closed with a cover element on the front. The magnetic bearing has means for adjusting an axial position of the rotor shaft, means for detecting the axial position and at least one front axial catch bearing for the shoulder of the rotor shaft.

Spinning rotors of today's open-end spinning machines are often stored in magnetic bearings due to the high speeds of well over 100,000 rpm. These are advantageous compared to purely mechanical bearings at very high speeds because they have only low friction losses and are hardly susceptible to wear. They can be designed both as passive bearings with permanent magnets and as active bearings with controlled electromagnets. Contactless mounting in the radial and axial direction is not possible with passive mounting, however. If passive magnetic bearings are used in open-end spinning devices, they are generally used for radial bearings. So that the spinning rotor maintains a predetermined operating position in the axial direction, passive magnetic bearings are provided with an additional position control for the axial position. In the case of actively controlled magnetic bearings, on the other hand, both the radial position and the axial position of the spinning rotor are permanently recorded and controlled accordingly. Both the position control for passive magnetic bearings and the actively controlled magnetic bearings are dependent on a constant power supply. In order to avoid damage to the magnetic bearings in the event of malfunctions, therefore mechanical catch bearing provided. The present invention deals with both types of magnetic bearings.

An open-end spinning device with a passive magnetic bearing and a position control for the axial position (central position control) is for example from the DE 10 2006 030 187 A1 known.

Such magnetic bearings each contain a front and a rear position with magnetic devices, ie either permanent magnets, actively controllable electromagnets or a combination of the two. A part of these magnetic devices is fixed on the rotating rotor shaft of the spinning rotor and interacts with fixed magnetic devices which are fixed on the bearing housing of the spinning rotor. The assembly and removal of such a spinning rotor is therefore associated with considerable effort. In order to be able to quickly replace the rotor cup, for example in the event of wear or changing lots, it is therefore detachably connected to the rotor shaft by means of a coupling device.

A spinning rotor with a coupling device is from the EP 2 832 903 B1 known. The coupling device is designed as a plug-in coupling, in which the rotor cup can be inserted into or plugged onto the rotor shaft. With plug-in couplings of this type, the rotor cup may not be pushed onto the rotor shaft or inserted into the rotor shaft far enough, and the coupling length may be too short. The running behavior of the spinning rotor and also the spinning results are impaired by such incorrect assembly. In addition, a correct assembly state of the spinning rotor, ie the correct axial position of the rotor cup in relation to the rotor shaft, is also essential from a safety point of view because the rotor cup could become detached from the rotor shaft during operation. The object of the present invention is therefore to propose a method for checking the assembly state of a spinning rotor. Furthermore, a corresponding open-end spinning device is to be proposed.

The object is achieved by a method and an open-end spinning device with the features of the independent claims.

In the method for checking an assembly state of a spinning rotor, the spinning rotor is mounted in a magnetic bearing in an open-end spinning device which can be closed with a cover element on the front. The spinning rotor has a rotor shaft with a shoulder and a rotor cup detachably connected to the rotor shaft. The magnetic bearing includes means for adjusting an axial position of the rotor shaft, means for detecting the axial position and at least one front catch bearing for the shoulder of the rotor shaft.

To check the assembly status of the spinning rotor, i. H. To determine whether the rotor cup is in the correct axial position with respect to the rotor shaft, a first distance between the shoulder of the rotor shaft and the front catch bearing is defined for a regular axial operating position of the spinning rotor. Before starting the spinning rotor, the spinning rotor is moved axially in the direction of the front catch bearing until it reaches an axial stop. A first travel path of the spinning rotor between the regular axial operating position and the axial stop is recorded and compared with the first distance. The spinning rotor is started when the first travel path is equal to the previously defined first distance. The start of the spinning rotor, on the other hand, is prevented if the determined travel distance is smaller than the previously defined first distance.

A corresponding open-end spinning device, which can be closed at the front with a cover element, has a control device which is designed to carry out the method.

The invention is based on the idea that the spinning rotor accommodated in its regular axial operating position in the magnetic bearing can only be moved against the front catching bearing by the full travel distance, i.e. the first distance between the shoulder of the rotor shaft and the front catching bearing, if it has a correct installation condition. In this case, since the rotor cup is in its correct axial position in relation to the rotor shaft, the spinning rotor can be moved from its regular axial operating position in the direction of the front axial catch bearing until it strikes it. The axial stop, which limits the travel of the spinning rotor, is thus formed in this case by the front axial catch bearing. The travel of the spinning rotor or the rotor shaft therefore corresponds exactly to the previously defined distance between the shoulder of the rotor shaft and the front catch bearing.

On the other hand, if the spinning rotor has a faulty assembly state, i. H. If the rotor cup is not completely pushed onto or inserted into the rotor shaft, the spinning rotor has a greater axial length. If this spinning rotor is now moved in the direction of the front axial catching bearing, the spinning rotor strikes the cover element of the open-end spinning device due to the greater length with the edge of the rotor cup before the shoulder of the rotor shaft has reached the front axial catching bearing. In this case, the axial stop, which limits the travel of the spinning rotor, is not formed by the axial catch bearing, but by the cover element. The travel distance between the regular operating position and the axial stop is therefore shorter than the first distance between the regular operating position and the front axial catch bearing.

For determining the travel distance between the regular axial operating position and the axial stop, it is irrelevant whether the spinning rotor is moved from the regular axial operating position to the axial stop or vice versa from the axial stop to the regular axial operating position. It is only essential that the travel path with the previous one defined comparison measure, that is, the first distance between the regular operating position and the front axial catch bearing is compared.

It is advantageous in the described method and the described open-end spinning device that the entire method can be carried out automatically with the aid of components which are in any case part of the magnetic bearing or the open-end spinning device. Since no additional components are required, the method and the open-end spinning device can also be carried out correspondingly inexpensively. It is also particularly advantageous that the method can be carried out completely automatically. The starting of an incorrectly mounted spinning rotor is thereby advantageously prevented, which also ensures the safety of the operating personnel.

According to a first embodiment of the invention, before the spinning rotor is started, the cover element of the open-end spinning device is first closed and the spinning rotor is moved into its regular axial operating position. Only then is the spinning rotor moved in the direction of the front axial catch bearing until it reaches the axial stop. This means that the magnetic bearing is activated after the open-end spinning device is closed and the spinning rotor is brought into its regular axial operating position. From this he is then moved with the means for adjusting the axial position of the rotor shaft in the direction of the front axial catch bearing until he reaches the axial stop.

According to an alternative embodiment of the method, however, the spinning rotor is first moved in the direction of the front catch bearing until it reaches the axial stop, and only then is the cover element of the open-end spinning device closed and the spinning rotor is moved into the regular axial operating position. In this case, the magnetic bearing is activated before the open-end spinning device closes and the spinning rotor is moved up to the axial stop. Then becomes the open end spinning device closed with the cover element, the entire spinning rotor is displaced axially backwards by the cover element. Thus, if the spinning rotor is incorrectly installed, the cover element forms the axial stop; if the spinning rotor is correctly installed, however, the front axial catch bearing forms the axial stop. If the spinning rotor is now moved from the axial stop into its regular axial operating position after the open-end spinning device has been closed, the assembly state of the spinning rotor can in turn be inferred from the travel path.

According to a development of the method, before the spinning rotor is started, the spinning rotor is additionally moved in the direction of a rear axial catch bearing until it strikes the rear axial catch bearing with a rear bearing surface. In this case, the magnetic bearing has a rear axial catch bearing and the rotor shaft has a rear bearing surface for striking the rear catch bearing. Further information regarding the operational readiness of the open-end spinning device can be obtained from the travel path between the rear axial catch bearing and a reference point, for example the regular axial operating position or the front axial catch bearing. For example, contamination or damage in the bearing can be concluded from this.

Preferably, a second distance between the rear bearing surface of the rotor shaft and the rear catch bearing is defined for the regular axial operating position of the spinning rotor and the spinning rotor is moved between the regular axial operating position and the rear catch bearing. A second travel path of the spinning rotor is recorded. The detected second travel path is then compared with the second distance between the regular axial operating position and the rear catch bearing. From a deviation of the determined second travel distance from the defined second distance, damage and / or contamination of the rear axial catch bearing can be concluded.

In addition, it is advantageous if a signal is output by the open-end spinning device if the first travel distance deviates from the first distance and / or if the second travel distance deviates from the second distance. For this purpose, the open-end spinning device has an output device which can be controlled by the control device in the event of such a deviation. In this way, the operating personnel can quickly recognize that and possibly also why the open-end spinning device in question has not been put into operation.

According to an advantageous development of the method, the determination of the first travel path and / or the determination of the second travel path is carried out before each start of the spinning rotor. As a result, after the open-end spinning device has stopped, errors which have occurred after the successful initial start-up can also be reliably detected. However, it is also conceivable that the spinning rotor is no longer checked again after a stop due to a normal, automatic maintenance process. Such normal maintenance processes are, for example, piecing after a thread break or a cleaner cut, after cleaning the rotor, or after a bobbin change. The determination of the first travel path and / or the second travel path could, for example, also be carried out in rotation after a certain number of maintenance processes in each case, or could even be limited to the initial start-up after a lot change.

In the case of the open-end spinning device, it is furthermore advantageous if the coupling device of the spinning rotor comprises a locking device. At least the unintentional release of the coupling device after the correct assembly of the spinning rotor, for example during operation, can be avoided in this way.

It is advantageous if the locking device has a catch area which, when the spinning rotor is assembled, has a correct assembly state of the spinning rotor. This means that the spinning rotor automatically slips into the correct assembly state as soon as the catching area of the coupling device is reached when the rotor cup is mounted on the rotor shaft. This makes it possible to avoid faulty assemblies with only slight deviations from the correct assembly state. Compared to those with large deviations, such erroneous assemblies can often neither be visually detected by the operating personnel nor recognized after insertion into the spinning device by means of the described method. The safety of the open-end spinning device can thereby be increased further. Such a locking device with a catch area can be realized, for example, with an axial clip.

In order to achieve the greatest possible safety with only slightly faulty assemblies, it is advantageous if the spinning rotor has a minimal gap to the cover element when the shoulder rests against the front catch bearing and when the assembly is correct, and the catch area of the locking device is larger than the minimum gap. The safety of the open-end spinning device can hereby be guaranteed for all faulty assembly states of the spinning rotor, since larger assembly errors can be identified by means of the described method and smaller assembly errors can be avoided by the locking device with the catch area.

Figur 1

eine schematische, geschnittene Seitenansicht einer Offenendspinnvorrichtung mit einer Magnetlagerung und einem Spinnrotor,

Figur 2a

eine schematische, geschnittene Seitenansicht eines korrekt montierten Spinnrotors in seiner regulären Betriebsposition,

Figur 2b

den korrekt montierten Spinnrotor der Figur 2a, nachdem er an das vordere axiale Fanglager angeschlagen ist,

Figur 3a

eine schematische, geschnittene Seitenansicht eines fehlerhaft montierten Spinnrotors in seiner regulären Betriebsposition,

Figur 3b

den fehlerhaft montierten Spinnrotor der Figur 3a, nachdem er an das Deckelelement der Spinnvorrichtung angeschlagen ist,

Figur 4a

eine schematische, geschnittene Seitenansicht eines fehlerhaft montierten Spinnrotors nach dem Anschlagen an das vordere axiale Fanglager und vor dem Schließen des Deckelelements,

Figur 4b

den fehlerhaft montierten Spinnrotor der Figur 4a, nachdem das Deckelelement geschlossen wurde und der Spinnrotor verschoben wurde,

Figur 4c

eine schematische, geschnittene Seitenansicht eines korrekt montierten Spinnrotors, nach dem Anschlagen an das vordere axiale Fanglager und vor dem Schließen des Deckelelements,

Figur 5

eine schematische, geschnittene Seitenansicht eines Spinnrotors nach dem Anschlagen an das hintere axiale Fanglager,

Figur 6

eine geschnittene Detaildarstellung einer hinteren Lagerfläche eines Spinnrotors und eines hinteren axialen Fanglagers,

Figur 7

eine geschnittene Detaildarstellung einer Kupplungsvorrichtung eines Spinnrotors mit einer Arretiervorrichtung, sowie

Figur 8

eine geschnittene Detaildarstellung einer Arretiervorrichtung mit einem Fangbereich.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

Figure 1

1 shows a schematic, sectional side view of an open-end spinning device with a magnetic bearing and a spinning rotor,

Figure 2a

a schematic, sectional side view of a correctly assembled spinning rotor in its regular operating position,

Figure 2b

the correctly installed spinning rotor of the Figure 2a after hitting the front axial bearing,

Figure 3a

a schematic, sectional side view of an incorrectly assembled spinning rotor in its regular operating position,

Figure 3b

the incorrectly installed spinning rotor Figure 3a after it strikes the lid element of the spinning device,

Figure 4a

2 shows a schematic, sectional side view of an incorrectly installed spinning rotor after striking the front axial catch bearing and before closing the cover element,

Figure 4b

the incorrectly installed spinning rotor Figure 4a after the cover element has been closed and the spinning rotor has been moved,

Figure 4c

a schematic, sectional side view of a correctly assembled spinning rotor, after striking the front axial catch bearing and before closing the cover element,

Figure 5

2 shows a schematic, sectional side view of a spinning rotor after striking the rear axial catch bearing,

Figure 6

2 shows a sectioned detailed illustration of a rear bearing surface of a spinning rotor and a rear axial catch bearing,

Figure 7

a sectional detailed view of a coupling device of a spinning rotor with a locking device, and

Figure 8

a sectional detailed view of a locking device with a catch area.

In the following description of the figures, the same reference numerals are used for features that are identical or at least comparable in the individual designs or the individual figures. Some of the features are therefore only explained when they are first mentioned or only once using a suitable figure. If these features are not explained separately in connection with the other figures, their design and / or mode of operation corresponds to the design and mode of operation of the identical or comparable features described. For reasons of clarity, in the case of several identical features or components in a figure, usually only one or only a few of these identical features are labeled.

Figure 1 shows an open-end spinning device 1 in a schematic, sectional overview. The open-end spinning device 1 can be closed at the front with a cover element 7. There is a magnetic bearing 6 in the open-end spinning device 1, in which a spinning rotor 2 is rotatably mounted. The spinning rotor 2 is formed in two parts with a rotor cup 4 and a rotor shaft 3, which are connected by a coupling device 14. The spinning rotor 2 can be rotated and held by means of a drive 18. The magnetic bearing 6 conventionally includes a front radial bearing 6a, a rear radial bearing 6b and, in the present case, a separate axial bearing 6c. However, it is not absolutely necessary to design the axial bearing 6c separately from the radial bearings 6a, 6b. It is also possible that the axial bearing is also brought about by the components of the radial bearing. By means of the magnetic bearing 6, the spinning rotor 2 is kept in a floating state in the radial direction and in the axial direction, as a result of which a bearing gap 20 is formed, and is thereby supported. The magnetic bearing 6 can be designed as an active magnetic bearing or as a passive magnetic bearing. The open-end spinning device 1 further includes a control device 15, by means of which the magnetic bearing 6 can be operated and with which, depending on the version the magnetic bearing 6, at least some of the components of the magnetic bearing 6 are in a tax-related connection (dotted lines). The various designs of such magnetic bearings 6 and their structure are well known and are therefore not explained in detail. Furthermore, the open-end spinning device 1 shown here has an output device 16 for outputting a signal, which is likewise in control connection (dotted line) with the control device 15.

Regardless of the design of the magnetic bearing 6 as an active or a passive magnetic bearing, the magnetic bearing 6 has means 8 for adjusting the axial position of the spinning rotor 2 or the rotor shaft 3 and means 9 for detecting the axial position. In the present case, these are arranged in the region of a rear end of the spinning rotor 2, but a different arrangement would also be conceivable, depending on the design of the magnetic bearing 6. In the simplest case, the means 9 for detecting the axial position of the spinning rotor 2 include a sensor coil that reports the detected axial position to the control device 15, and the means 8 for adjusting the axial position include a magnetic coil that can be controlled by the control device 15. Likewise, the means 8 for adjusting the axial position can also include one or more regulated electromagnets of an active magnetic bearing 6 and the means 9 for detecting the axial position can comprise a plurality of position sensors. It is also possible for the means 9 to be designed to detect the absolute position of the spinning rotor 2 in the magnetic bearing 6. To carry out the method, however, it is sufficient if the means 9 are only designed to detect a change in position of the spinning rotor 2 in the axial direction. The actual position of the spinning rotor 2 can nevertheless be inferred from the detected change in position and the control data of the means 8 for setting the axial position.

Furthermore, the open-end spinning device 1 has, in a manner known per se, a front axial catch bearing 10 and a rear axial catch bearing 12, which the rotating and stationary parts meet prevent the magnetic bearing 6 in the event of a power failure or if vibrations occur. The spinning rotor 2 accordingly has a shoulder 5 which interacts with the front axial catch bearing 10. To interact with the rear axial catch bearing 12, the spinning rotor 2 has a rear bearing surface 13, which in the present case is formed by the rear end of the rotor shaft 3. In its regular axial operating position 11 (see Figures 2-5 ) the spinning rotor 2 is usually in a central position between the two catch bearings 10, 12, which is held by the means 9 for detecting the axial position and the means 8 for adjusting the axial position.

A first embodiment of the method for checking an assembly state of a spinning rotor 2 will now be described with reference to Figures 2a, 2b , 3a and 3b explained. In this method, the cover element 7 of the open-end spinning device 1 is first closed and only then is the spinning rotor 2 moved in the direction of the front axial catch bearing 10.

In Figure 2a the spinning rotor 2 is shown in its regular axial operating position 11, in which the shoulder 5 of the rotor shaft 3 is at a first distance s0 from the front axial catch bearing 10. Likewise, the rear bearing surface 13 has a second distance h0 from the rear axial catch bearing 12. The spinning rotor 2 is shown here in a correct assembly state, in which the rotor cup 4 is completely attached to the rotor shaft 3. If the spinning rotor 2 is in a correct assembly state and in its regular axial operating position 11, it has a regular gap dimension k0 to the cover element 7 of the open-end spinning device 1, as shown here. The cover element 7 can contain a channel plate or a channel plate adapter that can be inserted into such a channel plate. Before starting the spinning rotor 2, the magnetic bearing 6 is now activated and the spinning rotor 2 is made to float. Furthermore, the spinning rotor 2 or the rotor shaft 3 by the means 8 for adjusting the Axial position of the rotor shaft 3 moves in the direction of the front axial catch bearing 10 until it reaches an axial stop.

Figure 2b shows the spinning rotor 2 after it has been moved in the direction of the front catch bearing 10 and has reached the axial stop. The first travel path s covered by the spinning rotor 2 was detected or determined by the means 9 for detecting the axial position of the rotor shaft 3. Since the spinning rotor 2 is in a correct assembly state, the shoulder 5 of the rotor shaft 3 can be moved against the axial catch bearing 10 as far as it will go. The spinning rotor 2 still has a minimum gap dimension km to the cover element 7 even after striking. The axial stop is thus formed with the spinning rotor 2 correctly mounted by the front axial catch bearing 10. By the control device 15 (see Figure 1 ) the first travel path s is now compared with the first distance s0. Since the spinning rotor 2 can be moved in a block against the front axial catching bearing 10 when the assembly is correct, the determined first travel path s corresponds to the first distance s0 which the shoulder 5 has in the regular axial operating position 11 of the spinning rotor 2 from the front axial catching bearing 10 . The open-end spinning device 1 can thus be put into operation and the spinning rotor 2 can be started.

Figure 3a on the other hand shows a spinning rotor 2 in a faulty assembly state, in which the rotor cup 4 is not completely pushed onto the rotor shaft 3 or the coupling device 14 is not completely closed. The spinning rotor 2 is also shown in its regular axial operating position 11, in which the shoulder 5 has the first distance s0 from the front axial catch bearing 10. The gap dimension k between the spinning rotor 2, more precisely between the open edge of the rotor cup 4 of the spinning rotor 2, and the cover element 7 is, however, reduced compared to the regular gap dimension k0, since the spinning rotor 2 has a greater axial length due to the faulty assembly state.

If the spinning rotor 2 is now moved by the means 8 for adjusting the axial position in the direction of the front axial catch bearing 10, the spinning rotor 2 with the rotor cup 4 abuts the cover element 7 before the shoulder 5 reaches the front axial catch bearing 10. Figure 3b shows the spinning rotor 2 after it has been moved in the direction of the front axial catch bearing 10 and struck against the cover element 7. Thus, in the event of a faulty assembly state of the spinning rotor 2, the cover element 7 forms the axial stop. The first travel path s covered by the spinning rotor 2 from the regular axial operating position 11 to the axial stop, here the cover element 7, is again determined by the means 9 for detecting the axial position and compared with the first distance s0. Since the first travel path s is smaller than the first distance s0, an incorrect assembly state of the spinning rotor 2 can be concluded and the starting of the spinning rotor 2 is prevented for safety reasons. If an axial incorrect position of the rotor cup 4 has been identified in this way, this is preferably done by means of the output device 16 ( Figure 1 ) is displayed.

A second embodiment of the method is based on the Figures 4a, 4b and 4c described. In this method, the magnetic bearing 6 is first activated and the spinning rotor 2 is moved in the direction of the front axial catch bearing 10 and only then is the cover element 7 closed.

Figure 4a shows the open-end spinning device 1 with the cover element 7 still open, the spinning rotor 2 having already been driven against the front axial catch bearing 10 and striking it. The axial stop is thus formed by the front axial catch bearing 10 in this method. The spinning rotor 2 is shown here in a faulty assembly state in which it has a greater axial length. The spinning rotor 2, more precisely the shoulder 5 of the spinning rotor 2, is again at the first distance s0 from the regular axial operating position 11, which is symbolized here only by a line. Now the cover element 7 closed, it contacts the incorrectly mounted spinning rotor and pushes it back in the direction of its regular axial operating position 11, as shown by the two-dot chain lines.

As now in Figure 4b shown, the spinning rotor 2 is transferred from the shifted position (solid lines) into its regular axial operating position 11 (dashed lines) after the cover element 7 has been closed. The first travel path s covered is in turn recorded and compared with the predetermined first distance s0. Since the spinning rotor 2 has already been displaced by the cover element 7 due to the faulty assembly state, the first travel path s in the present example is, however, smaller than the first distance s0 or possibly even negative, namely when the spinning rotor 2 is above its regular axial operating position 11 was also moved towards the rear axial catch bearing 12. From the too small travel s, it can in turn be concluded that the spinning rotor 2 is in an incorrect assembly state.

Figure 4c on the other hand shows the method according to the second embodiment with the spinning rotor 2 correctly installed Figure 4a described, the spinning rotor 2 is moved to the front axial catch bearing 10 until the cover element 7 is closed. The cover element 7 is now closed (two-dot chain lines). Since the spinning rotor 2 has the correct axial length due to the correct assembly state, it is not displaced by the cover element 7. If, after the cover element 7 has been closed, the spinning rotor 2 is moved from its axial stop, here the front catch bearing 10, into its regular axial operating position 11, the first travel path s therefore corresponds exactly to the predefined, first distance s0.

Figure 5 shows a further step that can be carried out both in the method after the first execution and in the method after the second execution. The spinning rotor 2 is thereby by means 8 To adjust the axial position of the spinning rotor 2 or the rotor shaft 3, move from its regular axial operating position 11 (dashed lines) in the axial direction against the rear axial catch bearing 12 until it strikes it (solid lines). The second travel h is detected by means 9 for detecting the axial position and compared with the predefined second distance h0. If the second travel path h is smaller than the second distance h0, it can be concluded, for example, that the rear axial catch bearing 12 has a flight. It is irrelevant whether the method against the rear axial catch bearing 12 is carried out before the method in the direction of the front axial catch bearing 10 or after. Furthermore, it is of course also conceivable to move the spinning rotor 2 directly from the front stop position, in which it is attached either to the front axial catch bearing 10 or to the cover element 7, to the rear axial catch bearing 12 or vice versa.

Figure 6 shows the rear end of the rotor shaft 3 and the rear axial catch bearing 12 again in a detailed representation. It can be seen that, due to contamination 21 of the rear axial catch bearing 12, the spinning rotor 2 or the rotor shaft 3 cannot be moved by the full second distance h0, but already strikes the contamination 21 after a shorter second travel path h. In the event of a deviation of the second travel path h from the second distance h0, the output device 16 ( Figure 1 ) a signal is output.

Most of the faulty assembly states of the spinning rotor 2 can be identified by means of the described methods. How from Figure 2b emerges, the spinning rotor 2 also has a minimum gap km to the cover element 7 when it is in the correct assembly state when it is struck against the front axial catch bearing 10. A faulty assembly state in which the deviation of the axial position of the rotor cup 4 is smaller than the minimum gap km can therefore not be detected by means of the described methods will. Rather, the spinning rotor 2 can be moved up to the stop on the front axial catch bearing 10 despite the slightly faulty assembly.

The coupling device 14 of the spinning rotor 2 therefore preferably has a locking device 17 with a catch area I. Such a locking device 17 is in the Figures 7 and 8 shown. In the present case, the locking device 17 is designed in the form of an axial clip 19. Figure 7 shows a schematic sectional view of the coupling device 14 in a side view Figure 8 shows a sectional detailed view of the locking device 17 with the catch area I in a side view. The axial clip 19 can be designed, for example, in the form of a snap ring or O-ring which interacts with a corresponding recess 22 or groove. The catch area I describes the distance to the correctly coupled position at which the rotor cup 4 just snaps into the correctly coupled axial position. This catch area I is preferably larger than the minimum gap dimension km, so that the faulty assembly states can now be recognized with only slight deviations of the rotor cup 4 from the correct axial position.

The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the claims are possible as well as a combination of the features, even if these are shown and described in different exemplary embodiments.

Reference list

1

Open end spinning device

2nd

Spinning rotor

3rd

Rotor shaft

4th

Rotor cup

5

shoulder

6

Magnetic bearings

• 6a front radial bearing
• 6b rear radial bearing
• 6c thrust bearing

7

Cover element

8th

Means for adjusting the axial position

9

Means for detecting the axial position

10th

front axial catch bearing

11

regular axial operating position

12th

rear axial catch bearing

13

rear storage area

14

Coupling device

15

Control device

16

Output device

17th

Locking device

18th

drive

19th

Axial clip

20th

Bearing gap

21

pollution

22

Recess

s0

first distance

s

first travel path

h0

second distance

H

second travel path

k0

regular gap size

km

Minimum gap size

k

Gap dimension

I.

Catch area

Claims (14)

Method for checking an assembly state of a spinning rotor (2), which comprises a rotor shaft (3) with a shoulder (5) and a rotor cup (4) detachably connected to the rotor shaft (3) and which in a magnetic bearing (6) in front A cover element (7) which can be closed by an open-end spinning device (1) is mounted, the magnetic bearing (6) having means for adjusting an axial position of the rotor shaft (3), means for detecting the axial position and at least one front axial catch bearing (10) for the shoulder (5) of the rotor shaft (3), characterized in that for a regular axial operating position (11) of the spinning rotor (2) defines a first distance (s0) between the shoulder (5) of the rotor shaft (3) and the front axial catch bearing (10) becomes,
that before starting the spinning rotor (2) the spinning rotor (2) is moved axially in the direction of the front axial catch bearing (10) until it reaches an axial stop, that a first travel path (s) of the spinning rotor (2) between the regular axial Operating position (11) and the axial stop is detected and compared with the first distance (s0)
and that the spinning rotor (2) is started when s = s0 and the starting of the spinning rotor (2) is prevented when s <s0. Method according to the preceding claim, characterized in that first the cover element (7) of the open-end spinning device (1) is closed and the spinning rotor (2) is moved into its regular axial operating position (11) and then the spinning rotor (2) in the direction of the front axial catch bearing (10) is moved until it reaches the axial stop. A method according to claim 1, characterized in that first the spinning rotor (2) is moved in the direction of the front axial catch bearing (10) until it reaches the axial stop and then the cover element (7) of the open-end spinning device (1) is closed and the spinning rotor (2) is moved into its regular axial operating position (11). Method according to one of the preceding claims, characterized in that before the spinning rotor (2) is started, the spinning rotor (2) is moved in the direction of a rear axial catch bearing (12) until it has a rear bearing surface (13) on the rear axial catch bearing (12) strikes. Method according to the preceding claim, characterized in that for the regular axial operating position (11) of the spinning rotor (2) defines a second distance (h0) between the rear bearing surface (13) of the rotor shaft (3) and the rear axial catch bearing (12) becomes,
that the spinning rotor (2) is moved between the regular axial operating position (11) and the rear axial catching bearing (12), a second travel path (h) of the spinning rotor (2) being recorded,
and that the detected second travel path (h) is compared with the second distance (h0) between the regular axial operating position (11) and the rear axial catch bearing (12). Method according to one of the preceding claims, characterized in that if the first travel path (s) deviates from the first distance (s0) and / or if the second travel path (h) deviates from the second distance (h0), a signal is generated by the Open-end spinning device (1) is output. Method according to one of the preceding claims, characterized in that the determination of the first travel path (s) and / or the determination of the second travel path (h) is carried out before each start of the spinning rotor (2). Open-end spinning device (1), which can be closed on the front with a cover element (7), with a spinning rotor (2) mounted in a magnetic bearing (6), which has a rotor shaft (3) with a shoulder (5) and one with a coupling device (14) Detachably connected to the rotor shaft (3) rotor cup (4), the magnetic bearing (6) means for adjusting (8) an axial position of the rotor shaft (3), means for detecting (9) the axial position and at least one front axial catch bearing (10 ) for the shoulder (5) of the rotor shaft (3) and with a control device (15), characterized in that the control device (15) is designed to carry out the method according to one of the preceding claims. Open-end spinning device (1) according to the preceding claim, characterized in that the magnetic bearing (6) has a rear axial catch bearing (12) and the rotor shaft (3) has a rear bearing surface (13) for abutting the rear axial catch bearing (12). Open-end spinning device (1) according to one of the preceding device claims, characterized in that the open-end spinning device (1) contains an output device (16) for outputting a signal which, if the first travel path (s) deviates from the first distance (s0) and / or in the event of a deviation of the second travel path (h) from the second distance (h0) from the control device (15). Open-end spinning device (1) according to one of the preceding device claims, characterized in that the coupling device (14) comprises a locking device (17). Open-end spinning device (1) according to one of the preceding device claims, characterized in that the locking device (17) has a catch area (I) which ensures a correct assembly state of the spinning rotor (2) during assembly of the spinning rotor (2). Open-end spinning device (1) according to one of the preceding device claims, characterized in that the locking device (17) includes an axial clip (19). Open-end spinning device (1) according to one of the preceding device claims, characterized in that the spinning rotor (2) has a minimum gap dimension (km) to the cover element (7) when the shoulder (5) rests on the front axial catch bearing (10) and when the mounting condition is correct and that the catch area (I) of the locking device is larger than the minimum gap dimension (km).

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