EP3673103A1

EP3673103A1 - Method for operating a ring spinning frame, and ring spinning frame

Info

Publication number: EP3673103A1
Application number: EP18766047.7A
Authority: EP
Inventors: Benedikt Ingold
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2017-08-25
Filing date: 2018-08-13
Publication date: 2020-07-01
Also published as: JP7346384B2; CN110945168A; CH714082A1; JP2020531703A; WO2019038631A1

Abstract

The invention relates to a method for operating a ring spinning machine (1), having a plurality of spindles (8) which each comprise an electrical drive (9), each electrical drive (9) having a decentralised control module (10) which has means for communication (10) by means of a data bus (13, 14) with a higher-level central control device (12). According to the invention at least one section module (11) is present, which is associated with a plurality of decentralised control modules (10), and the section control module (11) receives information about the decentralised control module (10) and determines information about a rotor speed, the state of the rotor, the operational state of the spindle (8), the bearing condition or bearing damage, or the oil level. The invention also relates to a correspondingly equipped ring spinning machine (1) and a system (24) for predictive maintenance.

Description

TECHNICAL FIELD The invention relates to a method for operating a ring machine and a ring spinning machine according to the preamble of the independent patent claims.

Prior art ring spinning machines with single spindle drive as an alternative to the tape drive have been known for some time, even if they could not prevail today in practice for various reasons compared to the conventional tape 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. EP1 191 132A2 and EP389849A2 also disclose spinning machines with single spindle drive. The drive arrangements comprise a rotationally effective electric drive motor which acts on a thread, a fiber, a fleece or a knitted fabric via a manipulator provided at the end of a shaft of the drive motor, for example equipped in the form of a guide roller. 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, and additional Aktorikele- 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 from resonance problems and to ensure on the other hand, even at high speeds sufficient smoothness and durability. For the control or regulation of the electric drive motor, a decentralized control module is provided. The decentralized control module, which is provided functionally and usually 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 running systems are relatively large, expensive and expensive in terms of installation and maintenance.

The document EP2999096A2 relates to a textile machine with at least one drive arrangement comprising a rotationally effective electric drive motor with a stator which in each case is partially covered by a housing of the drive motor and which has at least one winding, with a rotor held rotatable relative to the stator with respect to a shaft of the drive motor 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 decentralized control module associated with the drive motor 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 Superordinate central control device, wherein at least one provided for supporting the shaft bearing is resiliently supported by the elastic means in relation to the stator on the housing such in 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 can be detected via a first sensor ,

WO2009132469A1 discloses a single-spindle drive spinning machine characterized in that a control section comprises four printed circuit boards each comprising a plurality of spindle drive electronic units, the power supply and the communication with the spindle drive electronic units is performed on these circuit boards via line paths, wherein a board is formed as a section board comprising the section electronics unit and one or more connection interfaces an external communication device and a power supply and printed circuit boards are connected in series.

Here, the relevant spindle drive electronics unit or section electronics unit, for example, for autonomous execution of one or more of the following functions yarn break detection, Luntenstopp, single spindle drive control, thermal monitoring of Einzelspindelantriebe, Luntenumschaltung, spindle speed measurement, yarn tension measurement, communication with an associated walking machine, spinning stations operator guidance , Fault displays, hand switches and / or other sensor functions. Preferably, a thread breakage and / or an increased thread tension by the respective spindle drive electronics unit via the Strombzw. Power consumption of the respective workstation associated electric motor drive determinable. From the machine control unit itself z. As the start-up and / or sequence control, which can be effective, for example, both in a normal shutdown as well as an emergency shutdown in case of power failure.

A disadvantage of these embodiments, however, that in particular on individual spindle drives communication must be ensured by the central control device, which is not possible over the existing communication means. In addition, with individual spindle drives, it has not been possible to the present extent to obtain further information about the spindles, the spindle state or the spinning situation in the central control device and to use them in particular for predictive maintenance.

Presentation of the invention

Object of the present invention is further to provide a textile machine, which is in particular ring spinning machine, with single spindle drives, in the information can be made available via the condition of the spindles and can be used for predictive maintenance.

The object is achieved by a method according to the preamble of patent claim 1, characterized in that

At least one section module is present, which is assigned to a plurality of decentralized control modules,

• whereby the section control module receives information about a rotor speed, the condition of the rotor, the operating state of the spindle, the bearing condition or bearing damage, or the oil level from the decentralized control modules.

The object is also achieved by a ring spinning machine according to the preamble of the claim, characterized in that

• the section module having means for communicating with the remote control modules; and

• The section module comprises means for determining information about a rotor speed, the state of the rotor, the operating state of the spindle, the bearing condition or bearing damage, or the oil level.

The information (s) about load shedding and / or current form of an electric drive from an assigned, decentralized control module can be interrogated by the section module and sent by 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 comprise an averaging or a Fourier transformation. 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 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 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.

A decentralized control module can advantageously determine a thread break due to a load throw of the electric drive and report this to the assigned 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.

Advantageously, the information obtained from the individual spindle drives information about rotor speed, condition of the rotor, operating state of the spindle, storage condition or bearing damage, or the oil level on the central control device to a system for Predictive Maintenance will be forwarded. Advantageously, the predictive maintenance system has suitable algorithms for predicting when, due to the evolution of one or a plurality of data, the comparison of various data measured by the spindle with one another (cross correlation) and comparison with data stored in databases Element of the single spindle drive, the ring traveler, etc. when must be replaced. The system will also include a memory to store this data. With the system, an operator can plan the necessary maintenance in advance. The Predictive Maintenance system can also be used with an automated ordering system so that necessary orders can be made for replacement and wear parts, and these are available in time for service.

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 comprises software code sections with which the method steps according to one of the preceding, inventive method claims are executed when the computer program product is executed on the ring spinning machine becomes. Brief description of the figures

Further advantages of the invention are described in the following embodiments, wherein

Fig. 1 shows schematically a ring spinning machine with single spindle drive; and

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.

Ways to carry out the invention

Fig. 1 shows schematically a ring spinning machine 1 according to the invention, which has a plurality of juxtaposed spinning stations 2. The spinning units 2 are arranged in a longitudinal direction X of the ring spinning machine 1 between a head 3i and a foot 3 ₂ . Head 3i and foot 3 _{2 of} the ring spinning machine 1 can contain 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.

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. Within the scope of the invention, it is conceivable that a plurality of decentralized control modules 10 of the individual spindle drives 9 are combined. A plurality of decentralized control modules 10, for example 64 control modules 10, communicate with a higher-level section control module 1 1, two of which are shown by way of example in FIG. 2. However, the number of section control modules 1 1 will depend on the number of spindles 8, as indicated by the dashed control module 10. The section modules 1 1 process the information from the control modules 10 and forward the information. Several decentralized section control modules 1 1 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.

A machine data bus 13 is present between the central control module 12 and the section control modules 11, 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 1 1; Over him are commands from the section module

1 1 transmitted to the control modules 10 and the operating conditions or measurement data of the electric drives 9 of the spindles 8 of control modules 10 to the section control modules 1 1 passed.

Additionally and independently of the data bus 13, 14, there is a digital communication network 15 with which 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 passed through the section control modules 1 1 (dashed line) directly to the control modules 10. About the communication network 15 can all decentralized at the same time Control modules 10 of the electric drives 9 are addressed by the central control device 12, for example, via the digital communication network 15 of the central control device 12, for example, a start / stop signal or command to control the acceleration or deceleration ramp to the decentralized control modules 10 are sent.

FIG. 2 further shows command and signaling elements 17, with each individual spindle drive 9 being assigned exactly one command and signaling element 17. These command and reporting elements are arranged in the form of controls 17 on the ring rail 23 of the ring spinning machine. 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 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 option of entering a command (eg start or stop) on 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 individual spindle drives 9, a yarn break or a creeping spindle can be determined on the basis of 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 specific decentralized control module 10 can report this to the section control module 11. However, the section module 1 1 can also query all associated decentralized control modules 10 in succession. The information thus obtained is then evaluated in succession and the operating states determined. The section module 1 1 has for determining the said operating conditions (computation) means for evaluating the information obtained. The calculating means comprise means for forming a root mean square current consumption and transforming the current form. To transform the signal from the time domain into the frequency domain, the Fourier transformation, the wavelet transformation and the Hilbert-Huang transformation with the Empirical Mode Decomposition are used in particular 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 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 on the basis of a statement about the similarity of the signals in question.

In an alternative embodiment, the control modules 10 have the above-mentioned (arithmetic) means in order to evaluate the operating states. These then send the result to the assigned section module 1 1 for further processing. Further, the control modules 10, the information from the current signal of the electric Use drives 9 to control the speed 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 stations 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 1 1 a thread break, a creep or other malfunction in the above manner (power consumption, load shedding, etc.) determines the maintenance car can be informed about the spinning unit 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.

Advantageously, the information obtained from the individual spindle drives information about rotor speed, condition of the rotor, operating state of the spindle 8, storage condition or bearing damage, or the oil level can be displayed on the spinning machine 1 itself and / or forwarded via the central control device 12 to a system 24 for predictive maintenance become. The predictive maintenance system 24 has algorithms for predicting when and which element of the data, based on the evolution of one or a plurality of data, comparing different data measured by the spindle with each other (cross correlation), and comparing data stored in databases Einzelspindelantriebs 9, the ring traveler, etc. when must be replaced. The system 24 will also include a memory to store this data. Such a system that works with a large amount of data (big data) is known, for example, from WO2018055508.

The system 24 for predictive maintenance further comprises an indicator, which is a central display of a spinning mill, on which the individual machines and, among other things, the ring spinning machine 1 are displayed. An operator can inform himself there in advance about the necessary maintenance of the machine (s) and plan this. The predictive maintenance system 24 will provide all necessary information for maintenance, including operating instructions and a display, on which machine, which maintenance must be performed and when. This information can also be sent to the ring spinning machine 1 and displayed there on the local display 20. As soon as the operator has completed the necessary maintenance steps, he indicates this on the display 20 or the central display and confirms the completion of the work.

The system 24 for predictive maintenance can also be used with an automatic ordering system, so that necessary orders can be made for spare and consumable parts and these are available in time for the maintenance of the individual spindle drives 9 of the ring spinning machine 1.

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 comprises software code sections, with which the method steps are carried out according to one of the preceding, inventive method claims, if the computer program product on the ring spinning machine 1 is executed. LIST OF REFERENCE NUMBERS

1 ring spinning machine

2 spinning stations

3i head of the ring spinning machine 1

3 ₂ feet of the ring spinning machine 1

4 roving bobbin

5 drafting system

6 roving

7 Kops

8 spindle

9 Single spindle drive of a spindle 8

10 decentralized control module of a single spindle drive 9

1 1 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 message element, operating unit Maschinenbefehlsbus

Sektionsbefehlsbus

display

service carriage

spindle rail

ring rail

System for predictive maintenance

ordering system

Claims

claims

1 . Method for operating a ring spinning machine (1) having a plurality of spindles (8) arranged on a spindle bank (22) and each comprising an electric drive (9), each electric drive (9) comprising 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 (1 1) is present, which is assigned to a multiplicity of decentralized control modules (10),

• whereby the section control module (1 1) receives information about a rotor speed, the state of the rotor, the operating state of the spindle (8), the bearing state or the oil level from the decentralized control modules (10).

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 (1 1) interrogated and this is sent to the section module (1 1) 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) to the the decentralized control module (10) associated with the section module (1 1) is sent.

4. A method for operating a ring spinning machine (1) according to one of the preceding claims, characterized in that the section module (1 1) polls 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 transformation.

6. 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.

7. A method for operating a ring spinning machine (1) according to one of the preceding claims, characterized in that the information about rotor speed, condition of the rotor, operating state of the spindle (8), storage condition or bearing damage, or the oil level via the central control device (12) to a system (24) for predictive maintenance.

8. A method for operating a ring spinning machine (1) according to the preceding claim, characterized in that the system (24) for predictive maintenance with an automatic ordering system (25) is connected and ordered needed Er- phrases.

9. A method for operating a ring spinning machine (1) according to one of the preceding claims 7 or 8, characterized in that the necessary maintenance on a display (20) of the ring spinning machine (1) or on the system (24) are displayed for predictive maintenance.

10. Ring spinning machine (1) for carrying out one of the preceding methods,

• with a plurality of spindles (8), each comprising an electric drive (9),

Wherein each electric drive (9) has 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 (1 1) is present, which is associated with a plurality of decentralized control modules (10), wherein the section module (1 1) comprises means for communication with the decentralized control modules (10); and

• the section module (1 1) means for determining information about a rotor speed, the state of the rotor, the operating state of the spindle (8), the

Bearing condition or bearing damage or oil level includes.

1 1. Ring spinning machine (1) according to one of the preceding claims, characterized in that the section module (1 1) or the decentralized control module (10) comprises means for evaluating said information, which means comprises averaging or a Fourniertransformation of the information.

12. Ring spinning machine (1) according to one of the preceding claims, characterized in that the section module (1 1) comprises means for interrogating associated decentralized control modules (10).

13. ring spinning machine (1) according to any one of the preceding claims, character- ized in that the central control device (12) comprises means for communication to a system (24) of predictive maintenance to the information about rotor speed, state of the rotor, operating state of the spindle (8), storage condition or bearing damage, or the oil level via the central control device (12) to a system (24) for predictive maintenance forward.

14. ring spinning machine (1) according to one of the preceding claims, characterized in that the ring spinning machine comprises a display (20) to indicate the necessary maintenance and individual maintenance steps.

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, plurality of textile machines comprising at least one ring spinning machine (1) according to any one of claims 10 to 15, characterized in that it comprises a system (24) for predictive maintenance.

17. 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 carried out according to one of the vorranggangen method claims when the computer program product on the ring spinning machine (1) runs.