EP3153609B1 - Drive assembly for a textile machine - Google Patents

Description

The invention relates to a drive arrangement for a textile machine according to the preamble of claim 1.

Textile machines commonly used today provide a drive arrangement with a multiplicity of drives which are arranged in, for example, three drive trains and process a plurality of textiles simultaneously across drive trains. It is typical that eight or ten or twelve drives are provided for each drive train, a first textile being processed by the first drives of the various drive trains, a second textile by second drives of the drive trains and so on. A total of eight or ten or twelve textiles can be processed at the same time.

The drives that act jointly on a textile each form an active network across the drive train. For the coordinated operation of the drives of the active network and to ensure a smooth interaction of these drives, a drive train and cross-functional control is provided. In addition, a For example, mechanical or optical sensor monitors the condition of the textile and / or controls the processing or operating parameters of the textile machine.

From the DE 198 40 408 A1 a method for measuring a tensile force of a thread in texturing machines is known. The thread tension is determined by measuring the difference between idling and under load.

From the WO 2015/059142 A1 a method for starting up godet drives of a texturing machine after a machine standstill is known, in which the drives are turned on manually by a user.

From the WO 2015/028309 A1 a method is known with which a lap of thread can be recognized in a texturing machine.

the DE 10 2014 014 729 A1 describes a texturing machine in which a group of eight electric drives has a control module and, separately therefrom, a power supply module.

Spinning devices and methods for operating spinning machines are also from the EP 1 609 893 A2 , the EP 2 759 623 A1 and the DE 10 2010 009 164 A1 known.

The object of the present invention is to specify a drive arrangement for a textile machine that is optimized in terms of costs.

To achieve the object, the invention has the features of claim 1.

The particular advantage of the invention is that a system state of the drive arrangement can be monitored without the provision of a thread sensor. In this respect, the costs for the thread sensor can be saved and the design of the drive arrangement can be simplified.

Instead of using a thread tension sensor, the operating signals (motor torque signal) are used for at least one of the drives and the actual state of the drive arrangement is preferably determined for all drives. Furthermore, a current system state (actual state) of the drive arrangement is recorded by comparing the motor torque signal with a reference signal state. For the comparison, an evaluation unit is provided which, on the one hand, is supplied with the engine torque signal and, on the other hand, interacts with or has a reference data memory. The at least one reference signal status of the drive arrangement is stored in the reference data memory. In this respect, the evaluation unit comprises, in particular, suitably designed computing means.

In particular, it can be provided that the detection means or the evaluation unit or the controller is designed to post-process the engine torque signal.

It can be provided, for example, that dynamic, time-variable components of the signals are used. For example, the amplitudes can be extracted from the motor torque signal or the signal can be transformed from the time domain into the frequency domain. The control or the detection means or the evaluation unit provides corresponding computing means for this purpose. To transform the signal from the time domain into the frequency domain, in particular the Fourier transform, the wavelet transform or the Hilbert-Huang transform with the empirical mode decomposition are used as the main component. In the context of the Fourier transformation, the short-term Fourier transformation, the Gabor transformation, the fast Fourier transformation or the discrete Fourier transformation can be used in training as a discrete cosine transformation or as a discrete sine transformation. In the wavelet transformation, in particular the discrete wavelet transformation, the fast wavelet transformation, the wavelet packet transformation or the stationary wavelet transformation are used. Likewise, discrete, static parameters 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. The signals can also be correlated, in particular cross-correlated or auto-correlated. 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 context of pattern recognition. This takes place in particular on the basis of specific features which are generated from the signal and summarized in a feature tool, on the basis of a statement about the similarity of the signals in question.

It is further provided that a plurality of reference signal states is stored in the reference data memory. A first reference signal state, which characterizes a bearing defect of the assigned drive, a second reference signal state, which characterizes a local thickening of the textile, for example due to a knot in the textile, and a third reference signal state, which characterizes a tear in the textile, are stored in the reference data memory. Further reference signal states can be provided, for example, in order to infer a storage defect in the supply stock or the withdrawal stock of the textile, to detect an imbalance in the drive train, to identify a defective or improperly working fan of the drive or to identify defects in the electronics area to characterize. Loose godets, which are fixed as rotating bodies on the shafts of the drives, or winding defects can also be identified via corresponding reference signal states. For this purpose, the operating signals determined by the detection means are compared directly or in processed form by the evaluation unit with the stored reference signal states. A mechanical or optical thread sensor is not necessary in this case, for example, in order to identify a tear in the textile. Depending on the determined system state of the drive arrangement, certain actions can be initiated or carried out for the active network. For example, in the event of a bearing defect, the entire functional network with all drives can be shut down until the necessary maintenance work has been completed. Likewise, it can be provided that all drives of the active composite are switched off in the event of a tear in the textile.

According to a further development of the invention, the controller can be designed to determine a first motor torque signal for a first drive and a second motor torque signal for an adjacent second drive of the same operative network. Next is the control designed to determine a difference between the engine torque signals.

A processing parameter for the textile, in particular a thread tension, is then determined on the basis of the difference. Advantageously, based on the thread tension, it is possible to infer the correct course of the production process and, in any case, indirectly implement quality control for the textile.

According to a further development of the invention, the control of the drive arrangement is designed in several stages. It comprises a higher-level machine control unit and a plurality of control modules which operate the various drives of the active network. The machine control unit and the control modules are connected to one another in terms of data technology via a data bus line. For example, the detection means for determining the engine torque signal and / or the evaluation unit and / or the reference data memory and / or the computing means are part of the control.

Further advantages, features and details of the invention can be derived from the further subclaims and the following description. Features mentioned there can be essential to the invention either individually or in any combination. The drawings serve only by way of example to clarify the invention and are not of a restrictive nature.

Fig. 1

eine Prinzipdarstellung einer erfindungsgemäßen Antriebsanordnung für eine Textilmaschine,

Fig. 2

einen ersten Zeitverlauf eines Motordrehmomentsignals,

Fig. 3

einen zweiten Zeitverlauf des Motordrehmomentsignals und

Fig. 4

einen dritten Zeitverlauf des Motordrehmomentsignals.

Show it:

Fig. 1

a schematic diagram of a drive arrangement according to the invention for a textile machine,

Fig. 2

a first time course of an engine torque signal,

Fig. 3

a second time course of the engine torque signal and

Fig. 4

a third timing of the engine torque signal.

The drive arrangement according to the invention according to Fig. 1 comprises a supply store 1 for a textile 3 to be processed by the textile machine, which is exemplarily designed in the manner of a thread, as well as a removal reservoir 2, in which the textile 3 is received after processing. Between the supply store 1 and the removal store 2, three drives 4, 5, 6 are provided, which are joined together in an active composite and act jointly on the textile 3. To control the drives 4, 5, 6, a control (not shown) is provided. The control comprises, for example, a higher-level machine control unit and three control modules assigned to the drives 4, 5, 6, which are connected to the machine control unit for data purposes via a data bus line. The withdrawal store 2 provides, for example, a spindle or spool for receiving the textile 3 and a further drive for rotating the spindle or spool receiving the textile 3. The supply supply 1 also includes, for example, a spindle or bobbin for the textile 3. However, according to the present exemplary embodiment of the invention, it is of passive design, that is to say it dispenses with a drive. The textile 3 is removed from the supply reservoir 1 by actuating the drives 4, 5, 6 that are combined in the functional composite.

During the processing of the textile 3, it is precisely this that is first fed to a first drive 4 of the knitted composite, then to a second drive 5 of the knitted composite and finally to a third drive 6 of the knitted composite. The drives 4, 5, 6 are arranged in rows, the third drive 6 being provided in front of the second drive 5 and the second drive 5 being provided in front of the first drive 4 when viewed in a thread transport direction 7.

The first drive 4 is part of a first drive train of the drive arrangement. Further drives of this first drive train are actuated together with the first drive 4 by the control module assigned to the first drive 4. In an analogous manner, the second drive 5 and the third drive 6 are each part of a second and a third drive train. The second drive train with the second drive 5 and further drives is operated by a second control module and the third drive train with the third drive 6 and further drives by a third control module. The control modules of the drive trains are preferably data-connected to the higher-level machine control unit via a data bus line.

During operation, a motor torque signal for the first drive 4, the second drive 5 and the third drive 6 are determined via suitable detection means. For example, the motor current signal, in particular, is recorded by sensors, whereas the other operating parameters are determined or calculated on the basis of a model (sensorless drive). It is then particularly the case that the engine torque signal is determined on the basis of a model from the operating parameters of the drive arrangement.

According to an alternative, not shown embodiment of the invention, the motor torque signal and the motor current signal can be detected by sensors. Suitable sensors, for example a rotation angle sensor, a speed sensor or a torque sensor, can be provided for this purpose. The sensors are preferably designed as part of the drives 4, 5, 6 or implemented functionally and / or spatially integrated in them. It can also be provided that, for the model-based determination of the motor torque, the motor current on the one hand and the angle of rotation and / or the speed on the other hand are detected by sensors. Accordingly, sensors for detecting the motor current and rotation angle sensors and / or speed sensors are provided.

The operating signals (engine torque signal) of the drives 4, 5, 6 determined by the detection means are fed to an evaluation unit of the drive arrangement. For example, the evaluation unit determines a system state of the drive arrangement in that the operating signals are compared with at least one reference signal state of the drive arrangement, which is stored in a reference data memory. A plurality of reference signal states are stored in the reference data memory, which, for example, characterize a bearing defect for one of the drives 4, 5, 6 or a bearing defect for the supply stock 1 or the withdrawal stock 2. In an analogous manner, further reference signal states can be provided in order to characterize the state of the drive arrangement. In particular, reference signal states can be stored in the reference data memory, from which a defective fan, an imbalance in the drive train or defective electronics (controller, Frequency converter) of the drives can be closed. For example, the Assessment of the system status of the drive arrangement by means of machine learning.

It can also be provided that corresponding operating signals for adjacent drives are determined and a thread tension is deduced from a difference in the operating signals of the adjacent drives 4, 5, 6. It can be provided that in addition to the reference signal states, which are based on the physical components of the drive arrangement, further reference signal states are stored which characterize the state or the current processing of the textile 3. In this respect, reference signal states are stored in the reference data memory, which allow conclusions to be drawn about local thickening or damage to the textile 3. A local thickening can be caused, for example, by a lump.

The Figs. 2 to 4 the time course of engine torque signals, which are determined by the detection means of the drive arrangement. The engine torque M is plotted against time t in each case.

A first example of the engine torque signal after Fig. 2 shows a periodically recurring motor torque signal, which is indicative of a bearing defect A of the associated drive 4, 5, 6, for example.

To Fig. 3 a torque characteristic is disclosed in a further motor torque signal over time, which shows a knot B in the textile 3 when interacting with a drive 4, 5, 6. Here, too, the system state in relation to the processed textile 3 is identified by comparing the motor torque signal with the stored reference signal states. If, for example, the textile 3 has a knot unexpectedly, the production process can be stopped or interrupted at short notice. If, for example, a textile with a locally different thickness structure is processed, the periodic signal can be used to monitor a planned or smooth production process.

A combination of the system states according to the Figs. 2 and 3 is after in the engine torque signal Fig. 4 shown. This is where a defective engine mount A and a knot B in the textile meet. The two events are recognized by a pattern comparison carried out in particular in the evaluation unit, and provision can in particular be made to stop the textile machine to correct the bearing defect or to carry out corrections on the textile 3.

The show only as an example Figs. 2 to 4 the engine torque signals over time. For evaluation purposes, in particular, post-processing of the signal, filtering or extraction of characteristic dynamic variables can take place. In particular, it can be provided that the engine torque signal is transformed from the time domain into the frequency domain or postprocessed in some other way. The evaluation unit, the detection means or the control have the necessary computing means for this. In particular, a Fourier analysis, a wavelet transformation, a waterfall diagram or empirical mode decomposition can be used to process the motor torque signal. The same components and component functions are identified by the same reference symbols.

Claims (7)

1. Drive assembly for a textile machine comprising a provisioning store (1) for a textile (3), an extraction store (2) for the textile (3), a plurality of drives (4, 5, 6) combined in an operational assemblage and being disposed between the provisioning store (1) and the extraction store (2), and with a controller designed to actuate the drives (4, 5, 6), wherein the controller cooperates with the drives (4, 5, 6) in such a way that the drives of the operational assemblage act jointly on the textile (3), wherein detection means are provided to determine a motor torque signal for at least one of the drives (4, 5, 6), wherein the motor torque signal can be supplied to an evaluation unit, and wherein the evaluation unit is designed in such a way that, on the basis of the motor torque signal, a system condition of the drive assembly is identified by comparison of the motor torque signal with at least one reference signal condition of the drive assembly stored in a reference data memory and/or that the system condition of the drive assembly is determined from the motor torque signal by means of machine learning, characterised in that the reference data memory stores a plurality of reference signal conditions, at least comprising a first reference signal condition which characterises a storage deficiency for one of the drives (4, 5, 6) and/or for the provisioning store (1) and/or for the extraction store (2), a second reference signal condition which characterises a local thickening of the textile (3), and a third reference signal condition which characterises a tear in the textile (3), wherein the controller and/or the detection means and/or the evaluation unit are designed to detect features from the motor torque signal on the one hand and the reference signal condition on the other hand and to compare these features in terms of their similarity.
2. Drive assembly as claimed in claim 1, characterised in that the detection means are designed for sensor-free determination of the motor torque signal.
3. Drive assembly as claimed in claim 1 or 2, characterised in that the detection means are designed for determination of the motor torque signal and/or the evaluation unit and/or the reference data memory are designed as part of the controller.
4. Drive assembly as claimed in any one of claims 1 to 3, characterised in that the controller and/or the evaluation unit provides computing means and is designed in such a way that the motor torque signal is transformed from the time range into the frequency range.
5. Drive assembly as claimed in any one of claims 1 to 4, characterised in that the controller is designed with multiple stages and provides a superordinate machine control unit and a plurality of control modules, wherein the control modules are connected via a data bus line to the machine control unit and wherein each drive (4, 5, 6) of the operational assemblage cooperates with other control modules.
6. Drive assembly as claimed in any one of claims 1 to 5, characterised in that the controller and/or the detection means and/or the evaluation unit are designed to determine a first motor torque signal for a first drive (4) in the operational assemblage and a second motor torque signal for an adjacent, second drive (5) in the operational assemblage and a difference in the motor torque signals, and in that the controller is designed in such a way that a processing parameter for the textile, preferably a thread tension, is determined from the difference.
7. Drive assembly as claimed in any one of claims 1 to 6, characterised in that the controller and/or the detection means and/or the evaluation unit is designed to extract a plurality of features from the motor torque signal on the one hand and the reference signal condition on the other hand and to combine the features of the motor torque signal on the one hand in a first feature vector and of the reference signal condition on the other hand in a second feature vector and to compare the first feature vector with the second feature vector.

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