CH714082A1 - Method for operating a ring spinning machine and ring spinning machine. - Google Patents

Abstract

A method is disclosed for operating a ring spinning machine, the ring spinning machine having a plurality of spindles (8) arranged on a spindle bank (22) and each comprising an electric drive (9), each electric drive (9) a decentralized control module (10) which cooperates with the electric drive (9) and which comprises means for communication (10) by means of a data bus (13, 14) with a superordinate central control device (12). The invention is characterized in that at least one section module (11) is present, which is assigned to a multiplicity of decentralized control modules (10), the section control module (11) receiving information from the decentralized control modules (10) and information about a thread break, a speed of a spindle (8), a rotor speed, the state of the rotor, the operating state of the spindle (8), the bearing condition or bearing damage, or the oil level determined. The invention also relates to a correspondingly equipped ring spinning machine.

Description

description

Technical Field The invention relates to a method of operating a ring machine and a ring spinning machine according to the preamble of the independent claims.

Prior art Ring spinning machines with single spindle drive as an alternative to belt drive have been known for some time, even though they have not yet been successful in practice for various reasons compared with the conventional belt drive. Accordingly, there are numerous publications in this field, which inter alia with the drive concept or with the attachment of such spindle units on the machine frame, i. deal with the spindle bank. For example, CH698768A2 discloses such a spinning machine with a single spindle drive.

The drive assemblies comprise a rotationally effective electric drive motor, which acts on a end side of a shaft of the drive motor manipulator provided, for example, equipped in the form of a guide roller on a thread, a fiber, a nonwoven or knitted fabric. Furthermore, various external sensors are typically provided, which serve in particular for detecting a position of the thread, the fiber, the fleece or the knitted fabric, as well as additional actuator elements. The additional actuator elements serve, for example, for pretensioning or positioning the thread, the fiber, the knitted fabric or the fleece. The rotary electric drive motor is usually provided as a whole elastically mounted to protect the drive assembly on the one hand against resonance problems and on the other to ensure sufficient smoothness and lifetime even at high speeds.

For the control or regulation of the electric drive motor, a decentralized control module is provided. The decentralized control module, which is functionally and usually also provided spatially as part of the drive arrangement, also interacts with the external sensors and the additional actuator elements. The decentralized control module is connected via suitable communication means with a superordinate central control device.

The central control unit coordinates in particular a plurality of drive arrangements of the textile machine. In principle, the use of such drive arrangements in textile machines has proven itself over many years. Nevertheless, the distributed systems are comparatively large, expensive and expensive in terms of installation and maintenance.

The document EP 2 999 096 A2 relates to a textile machine comprising at least one drive arrangement comprising a rotary electric drive motor with a stator at least partially comprised of a housing of the drive motor, which has at least one winding, rotatable with a on a shaft of the drive motor in With respect to the stator held rotor and with at least one bearing for the shaft, comprising elastic means for supporting at least individual functional components of the drive motor and comprising a drive motor associated with the decentralized control module which cooperates with the drive motor on the one hand and with at least one sensor of the drive arrangement on the other hand and which Means for communicating with a parent central control device, wherein at least one bearing provided for supporting the shaft bearing via the elastic means resiliently supported relative to the stator to the housing i in such a way that the shaft with the rotor is held movably relative to the stator, that a synchronous electric motor is provided as the drive motor, and that a position of the shaft relative to the housing and / or a rotation angle of the shaft via a first sensor are detectable.

A disadvantage of this embodiment, however, that especially at individual spindle drives communication must be ensured by the central control device, which is not possible on the existing communication means. In addition, with individual spindle drives, it has not been possible to the present extent to obtain information about the spindles in the central control unit. At the same time an interaction with a maintenance car is not provided.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a textile machine, in particular a ring spinning machine, with individual spindle drives which can be addressed simultaneously by a central control device.

Object of the present invention is further to provide a textile machine, which is in particular ring spinning machine, with single spindle drives, in which the communication between controls of the individual spindles and the single spindle drives is simplified.

Object of the present invention is further to provide a textile machine, which is in particular ring spinning machine, with single spindle drives are provided in the information about the condition of the spindles available.

Object of the present invention is further to provide a textile machine, which is in particular ring spinning machine, with single spindle drives are easier to determine and correct thread breaks.

The object is achieved by a method according to the preamble of claim 1, characterized in that • at least one section module is present, which is assigned to a plurality of decentralized control modules, • wherein the section control module via the decentralized control modules information about a thread break, a speed of a spindle, a rotor speed, the state of the rotor, the operating state of the spindle, the bearing state or bearing damage, or the oil level receives.

The object is also achieved by a ring spinning machine according to the preamble of claim in that • at least one section module is present, which is assigned to a plurality of decentralized control modules, • wherein the section module comprises means for communication with the decentralized control modules; and • the section module comprises means for determining information about a thread break, a spindle speed, a rotor speed, the state of the rotor, the operating state of the spindle, the bearing state or bearing damage, or the oil level.

The information (s) on load shedding and / or current form of an electric drive from an associated, decentralized control module can be queried by the section module and sent from this to the section module and evaluated there. In an alternative embodiment, the information (s) about load shedding and / or current form of an electric drive can be evaluated by an assigned, decentralized control module and sent by the control module to the section module associated with the decentralized control module. Advantageously, the section module could query all associated decentralized control modules in succession, receive and evaluate the information. The section module will advantageously have corresponding means for querying assigned decentralized control modules.

The evaluation may include averaging or a Fourier transform. In the context of the Fourier transformation, in particular the short-time Fourier transformation, the Gabor transformation, the fast Fourier transformation or the discrete Fourier transformation in the training can be used as a discrete cosine transformation or as a discrete sine transformation. In particular, the wavelet transformation uses the discrete wavelet transformation, the fast wavelet transformation, the wavelet packet transformation or the stationary wavelet transformation. Likewise, discrete, static characteristic quantities of the signals can be used and a transformation of the signals in the frequency range can be dispensed with. In particular, random variables such as the expected value, the absolute deviation, the variance, the skewness, the excess or the covariance are used as parameters. Likewise, the signals can be correlated, in particular cross-correlated or autocorrelated.

Finally, a combination of the transformed signals and the static characteristics can be displayed. The common intention is, in particular, to compare the actual measurement signal with the reference signal state in the course of the pattern recognition, wherein the reference signal can be generated from information of one or more neighboring spindles or read out of a memory. This is done in particular on the basis of specific features which are generated from the signal and combined in a feature tool, based on a statement about the similarity of the signals in question.

A decentralized control module can advantageously determine a thread break due to a load throw of the electric drive and report this to the associated section module. The section module then has means for communication in order to inform a maintenance trolley about the load shedding or the thread break on a control module. Further, the control modules can advantageously use the information from the current signal of the electric drives for speed control of the spindle, the rotor or the control of the thread tension.

As electrical drives of the spindles electrical synchronous or asynchronous motors or brushless DC motors can be present. The spindles may have mechanical and / or magnetic bearings.

The invention also relates to a computer program product, which is characterized in that it can be loaded directly into an internal memory of a ring spinning machine and software code sections, with which the method steps are carried out according to one of the preceded, inventive method claims, if the computer program product on the ring spinning machine is executed.

BRIEF DESCRIPTION OF THE FIGURES Further advantages of the invention are described in the following exemplary embodiments, wherein

Fig. 1 shows schematically a ring spinning machine with single spindle drive; and FIG. 2 shows schematically the communication system of the ring spinning machine; demonstrate. Only the features important to the invention will be shown. Identical features are provided in different figures with the same reference numerals.

1 shows schematically a ring spinning machine 1 according to the invention, which has a multiplicity of spinning stations 2 arranged next to one another. The spinning units 2 are arranged in a longitudinal direction X of the ring spinning machine 1 between a head 3Ί and a foot 32. Head 3Ί and foot 32 of the ring spinning machine 1 can include bearings, drives, control, etc., which are necessary for the operation of the machine. As is further seen, for example, at two spinning stations 2 shown schematically in FIG. 1, each spinning station 2 consists of a roving bobbin 4, which is arranged above a drafting arrangement 5, and on which a roving 6 is wound. The roving 6 runs from the roving bobbin 4 via the drafting device 5, where it is stretched to then be guided to a Garnbildungelement. A circulating runner or ring traveler winds the finished yarn onto a cop 7. The cop 7 is placed on a spindle 8.

Fig. 2 shows schematically the communication system of the ring spinning machine 1. The ring spinning machine 1 has 8 single spindle drives 9 for driving the spindles, which drive the spindles 8. As a single spindle drive 9 electric drives, such as electric synchronous motors, asynchronous motors, brushless DC motors, etc. or equivalent motors are used. Each individual spindle drive 9 is assigned a decentralized control module 10.

The spindles 8, the individual spindle drives 9 and the control modules 10 are arranged on the spindle bank 22 of the ring spinning machine 1. The spindle rail 22 is shown only schematically and the components which are located on the spindle rail 22 are correspondingly in Fig. 2 within the element. The spindle rail 22 is advantageously movably mounted. The connections of the electric drives 9 have connecting cables, which are combined on the spindle bank 22 and connected at one end of the spindle bank to a power supply. Advantageously, the connections to the electrical drives 9 are realized by plug connections.

The control modules 10 have the task of monitoring the individual spindle drives 9 and implement commands from the higher-level control. It is conceivable within the scope of the invention that a plurality of decentralized control modules 10 of the individual spindle drives 9 are combined. A multiplicity of decentralized control modules 10, for example 64 control modules 10, communicate with a higher-level section control module 11, two of which are shown by way of example in FIG. 2. However, the number of section control modules 11 will depend on the number of spindles 8, as indicated by the dashed control module 10. The section modules 11 process the information from the control modules 10 and forward the information. Several decentralized section control modules 11 communicate with a higher-level central control module 12 of the ring spinning machine 1. The central control module 12 is the central machine control, which has all the machine data, this statistically processed and visualized. To the central control module 12, a display 20 is connected for this purpose. The machine data can be queried by the user via the display 20 at this point. It is also possible to forward this data to a mobile application.

Between the central control module 12 and the section control modules 11 there is a machine data bus 13 and a section data bus 14 is present between the section control modules 11 and the decentralized control modules 10. The section data bus 14 is responsible for the communication between control modules 10 and the section control modules 11; Commands from the section module 11 are transmitted to the control modules 10 via it, and the operating states or measured data of the electric drives 9 of the spindles 8 are directed by control modules 10 to the section control modules 11.

In addition, and independently of the data buses 13, 14, a digital communication network 15 is present, with the central control module 12 and the decentralized control modules 10 communicate with each other. About the communication network 15 time-critical and security-related information from the central control device 12 by the section control modules 11 (dashed line) forwarded directly to the control modules 10. At the same time, all the decentralized control modules 10 of the electric drives 9 can be addressed by the central control device 12 via the communications network 15, for example a start / stop signal or a command for controlling the acceleration signals can be transmitted from the central control device 12 via the digital communications network 15. or brake ramp to the remote control modules 10 are sent.

Fig. 2 further shows command and signaling elements 17, wherein each individual spindle drive 9 exactly one command and signaling element 17 is assigned. These command and reporting elements are in the form of controls 17 on the

Ring rail 23 of the ring spinning machine arranged. Several control modules 16 are connected via a section command bus 19 with the command and reporting elements 17 and parent. A machine command bus 18 provides for the communication between the control modules 16 and the central module 12. If a control module 10 detects an error, this information is sent via the bus system 14, 13, 18, 19 to the associated signaling element 17 and displayed there. The operator then has the opportunity to input a command (e.g., start or stop) to the ring rail 23 on the command element 17, which is then sent back to the control module 10 via the bus system 14, 13, 18, 19.

From the decentralized control modules 10 of the single spindle drives 9, a yarn break or a creep spindle can be determined due to the power consumption (load shedding). Due to the current shape, the speed, the rotor speed, the state of the rotor, the operating state of the spindle, the bearing condition or bearing damage, the oil level, etc. can be determined for mechanical bearings. If the spindle 8 is equipped with a magnetic bearing, the weight of a cop 7 can additionally be determined via the current consumption of the active magnetic bearing. In the case of a load shedding and an associated yarn breakage, a particular decentralized control module 10 can report this to the section control module 11. However, the section module 11 can also interrogate all assigned decentralized control modules 10 in succession. The information thus obtained is then evaluated in succession and determines the operating conditions.

The section module 11 has for determining the said operating conditions (rake) means for evaluating the information obtained. The calculating means comprise means for forming a root mean square current consumption and transforming the current form. For the transformation of the signal from the time domain into the frequency domain, in particular the Fourier transformation, the wavelet transformation or the Hil-bert-Huang transformation with the Empirical Mode Décomposition are used as the main constituent. In the context of the Fourier transformation, in particular the short-time Fourier transformation, the Gabor transformation, the fast Fourier transformation or the discrete Fourier transformation in the training can be used as a discrete cosine transformation or as a discrete sine transformation. In particular, the wavelet transformation uses the discrete wavelet transformation, the fast wavelet transformation, the wavelet packet transformation or the stationary wavelet transformation. Likewise, discrete, static characteristic quantities of the signals can be used and a transformation of the signals in the frequency range can be dispensed with. In particular, random variables such as the expected value, the absolute deviation, the variance, the skewness, the excess or the covariance are used as parameters. Likewise, the signals can be correlated, in particular cross-correlated or autocorrelated. Finally, a combination of the transformed signals and the static parameters can be represented. The common intention is, in particular, to compare the actual measurement signal with the reference signal state in the course of the pattern recognition, wherein the reference signal can be generated from information of one or more neighboring spindles or read out of a memory. This is done in particular on the basis of specific features which are generated from the signal and combined in a feature tool, based on a statement about the similarity of the signals in question.

In an alternative embodiment, the control modules 10 have the above-mentioned (arithmetic) means to evaluate the operating conditions. These then send the result to the assigned section module 11 for further processing. Further, the control modules 10 can use the information from the current signal of the electric drives 9 for speed control of the spindle 8, the rotor and the control of the thread tension.

A service trolley 21, which is shown in FIG. 1, moves along the longitudinal direction x of the spinning positions of the ring spinning machine 1, in order, for example, to remove thread breaks or other errors. If a control module 10 or a section module 11 detects a yarn breakage, a creep spindle or another malfunction in the above-mentioned manner (power consumption, load shedding, etc.), the service wagon can be informed about the spinning station 8. The maintenance trolley then moves to this spinning station 8 and, for example, reinstates the thread or fixes the error in another way. The communication is sent for example via the bus 13, 14 to the central control module 12, which informs the maintenance car.

The invention also relates to a computer program product, which is characterized in that it can be loaded directly into an internal memory of a ring spinning machine 1 and includes software code sections, with which the method steps are carried out according to one of the preceded, inventive method claims, if the computer program product is performed on the ring spinning machine 1.

DESCRIPTION OF SYMBOLS 1 ring spinning machine 2 spinning parts 31 head of ring spinning machine 1 32 feet of ring spinning machine 1 4 roving bobbin 5 drafting device 6 roving 7 cop 8 spindle 9 single spindle drive of a spindle 8 10 decentralized control module of a single spindle drive 9 11 section control module 12 central control module 13 machine data bus 14 section data bus 15 digital communication network 16 Control module for command and signaling element 17 17 Command and signaling element, operating unit 18 Machine command bus 19 Section command bus 20 Display 21 Maintenance trolley 22 Spindle bank 23 Ring bank

Claims (16)

claims A method of operating a ring spinning machine (1) having a plurality of spindles (8) disposed on a spindle bank (22) and each comprising an electric drive (9), each electric drive (9) being a decentralized control module (10) which cooperates with the electric drive (9) and which has means for communication (10) by means of a data bus (13, 14) with a superordinate central control device (12), characterized in that • at least one section module (11) is present, which is associated with a plurality of decentralized control modules (10), • wherein the section control module (11) via the decentralized control modules (10) information about a thread break, a rotational speed of a spindle (8), a rotor speed, the state of Rotor, the operating state of the spindle (8), the bearing condition or bearing damage, or the oil level receives 2. A method for operating a ring spinning machine (1) according to claim 1, characterized in that the information about load shedding and / or current form of an electric drive (9) from an assigned, decentralized control module (10) from the section module (11) queried and from this sent to the section module (11) and evaluated there. 3. A method for operating a ring spinning machine (1) according to claim 1, characterized in that the information about load shedding and / or current form of an electric drive (9) from an associated, decentralized control module (10) is evaluated and the control module (10) is sent to the the decentralized control module (10) associated with the section module (11). 4. A method for operating a ring spinning machine (1) according to any one of the preceding claims, characterized in that the section module (11) queries all associated decentralized control modules (10) successively receives the information and evaluates. 5. A method for operating a ring spinning machine (1) according to one of the preceding claims, characterized in that the evaluation comprises averaging or a Fourier transform. 6. A method for operating a ring spinning machine (1) according to any one of the preceding claims, characterized in that a decentralized control module (10) due to a load throw of the electric drive (9) detects a yarn break and reports this to the associated section module (11). 7. A method for operating a ring spinning machine (1) according to one of the preceding claims, characterized in that the control modules (10) the information of a current signal of the associated electric drive (9) for speed control of the spindle (8), the rotor and the control Use the thread tension. 8. A method for operating a ring spinning machine (1) according to the preceding claim, characterized in that the section module (11) a maintenance carriage (21) via a load shedding an electric drive (9) or a thread break on a control module (10). 9. ring spinning machine (1) for performing any of the foregoing methods, • with a plurality of spindles (8), each comprising an electric drive (9), • wherein each electric drive (9) has a decentralized control module (10) cooperates with the electric drive (9) and which means for communication (10) by means of a data bus (13, 14) with a superordinate central control device (12), characterized in that • at least one section module (11) is present, which is a plurality associated with remote control modules (10), the section module (11) having means for communicating with the remote control modules (10); and • the section module (11) comprises means for determining information about a yarn break, a rotational speed of a spindle (8), a rotor speed, the condition of the rotor, the operating state of the spindle (8), the bearing condition or the oil level , 10. ring spinning machine (1) according to any one of the preceding claims, characterized in that the section module (11) or the decentralized control module (10) comprises means for evaluating said information, which means comprises averaging or a Fournier transformation of the information. 11. ring spinning machine (1) according to any one of the preceding claims, characterized in that a decentralized control module (10) comprises means for detecting a yarn breakage. 12. ring spinning machine (1) according to one of the preceding claims, characterized in that the section module (11) comprises means for interrogation of associated decentralized control modules (10). 13. ring spinning machine (1) according to one of the preceding claims, characterized in that the electrical drives (9) are an electric synchronous motor or asynchronous motor or a brushless DC motor. 14. ring spinning machine (1) according to any one of the preceding claims, characterized in that the section module (11) means for communication a maintenance carriage (21) via a load shedding or a thread break on a control module (10) can inform. 15. Ring spinning machine (1) according to one of the preceding claims, characterized in that the spindles (8) have mechanical and / or magnetic bearings. 16. Computer program product, characterized in that it can be loaded directly into an internal memory of a ring spinning machine (1) and includes software code sections, with which the method steps are performed according to one of the vorranggangen method claims when the computer program product on the ring spinning machine (1) runs.