EP3153609A1 - Drive assembly for a textile machine - Google Patents

Abstract

The invention relates to a drive arrangement for a textile machine comprising a supply supply (1) for a textile (3), a removal storage (2) for the textile, a plurality of combined in a knitted unit drives (4, 5, 6), which between the supply supply and the control device, which is designed to control the drives, wherein the controller cooperates with the drives such that the drives of the active combination act together on the textile, wherein detection means are provided for determining a motor torque signal and / or a Motor current signal for at least one of the drives and that the motor torque signal and / or the motor current signal can be fed to an evaluation unit, wherein the evaluation unit is configured such that based on the motor torque signal and / or the motor current signal, a system state of the drive assembly by comparing the motor torque signal and / or the motor current signal is identified with at least one stored in a reference data memory reference signal state of the drive assembly and / or that the system state of the drive assembly is determined by means of machine learning from the motor torque signal and / or the motor current signal.

Description

The invention relates to a drive arrangement for a textile machine comprising a supply of supply for a textile, a removal storage for the textile, a plurality of combined in an operative network drives which are arranged between the supply supply and the removal storage, and with a controller which is adapted to drive the Drives, wherein the controller cooperates with the drives such that the drives of the active composite act together on the textile.

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 each drive train eight or ten or twelve drives are provided, wherein a first textile of each of the first drives of the various drive trains is processed, a second textile of each second drives of the drive trains and so on. In total, eight or ten or twelve textiles can be processed simultaneously.

In each case, the drives acting on a textile jointly form an active network across drive trains. For 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, the state of the textile is monitored by means of a mechanical or optical sensor, for example, and / or the processing or operating parameters of the textile machine are checked.

The object of the present invention is to specify a drive arrangement optimized for the cost of a textile machine.

To achieve the object, the invention in connection with the preamble of claim 1, characterized in that detection means are provided for determining a motor torque signal and / or a motor current signal for at least one of the drives and that the motor torque signal and / or the motor current signal can be supplied to an evaluation unit, wherein the evaluation unit is designed such that, based on the motor torque signal and / or the motor current signal, a system state of the drive arrangement is identified by comparing the motor torque signal and / or the motor current signal with at least one stored in a reference data memory reference signal state of the drive assembly and / or that the system state of the drive assembly is determined by means of machine learning from the motor torque signal and / or the motor current signal.

The particular advantage of the invention is that a system state of the drive assembly 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 yarn tension sensor, the actual state of the drive arrangement is determined from the operating signals (motor torque signal, motor current signal) for at least one of the drives and preferably for all drives. Furthermore, a comparison of the motor torque signal or the motor current signal with a reference signal state becomes instantaneous System state (actual state) of the drive assembly detected. For the comparison, an evaluation unit is provided, on the one hand, the motor torque signal or motor current signal is supplied and the other cooperates with a reference data memory or has this. The at least one reference signal state of the drive arrangement is stored in the reference data memory. In this respect, the evaluation unit particularly includes suitably designed calculation means.

In particular, it can be provided that the detection means or the evaluation unit or the controller is designed for reworking the motor torque signal or motor current signal. It can be provided, for example, that is turned off on dynamic, time-variant components of the signals. For example, the amplitudes can be extracted from the motor torque signal or the motor current signal or a transformation of the signal from the time range into the frequency range is carried out. For this purpose, the control or the detection means or the evaluation unit provides corresponding calculation means. For the transformation of the signal from the time domain into the frequency domain, in particular the Fourier transformation, the wavelet transformation or the Hilbert-Huang transformation with the Empirical Mode Decomposition 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 auto-correlated. Finally, a combination of the transformed signals and the static characteristics can be displayed. The common intention is in particular, in the context of pattern recognition the actual measurement signal to compare with the reference signal state. 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.

It may further be provided that a plurality of reference signal states is stored in the reference data memory. For example, in the reference data memory, a first reference signal state, which characterizes a bearing defect of the associated drive, and 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 crack in the textile , Other reference signal states may be provided, for example, to infer a bearing defect in the supply or removal of the textile to detect an imbalance on the drive train to identify a defective or improperly operating fan of the drive or defects in the field of electronics to characterize. Likewise, loose godets, which are defined as rotational bodies on the shafts of the drives, or winding defects can be identified via corresponding reference signal states. For this purpose, the operating signals determined via the detection means are each compared directly or in a processed form by the evaluation unit with the stored reference signal states. For example, a mechanical or optical yarn sensor is not necessary in this case to identify a crack in the fabric. In each case, specific actions can be initiated or executed depending on the determined system state of the drive arrangement for the active network. For example, in the event of a bearing failure, 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 rupture of the textile.

According to a development of the invention, the controller may be configured to determine a first motor torque signal or a first motor current signal for a first drive and a second motor torque signal or a second motor current signal for an adjacent second drive of the same active network. Next is the controller configured to determine a difference of the motor torque signals or the motor current signals. Based on the difference then a processing parameter for the textile, in particular a thread tension is determined. Advantageously, closed due to the thread tension on the proper course of the production process and quality control for the textile can be realized in any case indirectly.

The control of the drive assembly is formed in several stages according to a development of the invention. 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 via a data bus line in terms of data technology. For example, the detection means for determining the motor torque signal or the motor current signal and / or the evaluation unit and / or the reference data memory and / or the computing means are part of the controller.

From the other dependent claims and the following description further advantages, features and details of the invention can be found. There mentioned features may be essential to the invention individually or in any combination. The drawings are merely illustrative of the clarification of 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 a motor torque signal,

Fig. 3

a second time course of the engine torque signal and

Fig. 4

a third time course of the motor torque signal.

The drive arrangement according to the invention Fig. 1 comprises a supply supply 1 for a textile 3 to be processed by the textile machine, which is formed by way of example in the manner of a thread, and a removal stock 2, in which the textile 3 is received after processing. Between the supply supply 1 and the removal stock 2, three drives 4, 5, 6 are provided, which are joined together in an operative network and act together on the textile 3. For controlling 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 via a data bus line in terms of data technology. The removal stock 2 provides, for example, a spindle or spool for receiving the textile 3 and a further drive for rotating the textile 3 receiving spindle or spool. The supply supply 1 includes by way of example also a spindle or spool for the textile 3. However, according to the present embodiment of the invention, it is passively constructed, that is to say it dispenses with a drive. The textile 3 is removed from the supply supply 1 by actuation of the drives 4, 5, 6 which are combined in the active composite.

During the processing of the textile 3, this is first supplied to a first drive 4 of the active composite, then to a second drive 5 of the active composite and finally to a third drive 6 of the active composite. The drives 4, 5, 6 are arranged in a row, wherein viewed in a yarn transport direction 7, the third drive 6 in front of the second drive 5 and the second drive 5 are provided in front of the first drive 4.

The first drive 4 is part of a first drive train of the drive assembly. Further drives of this first drive train are actuated together with the first drive 4 by the first drive 4 associated control module. 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 other drives is operated by a second control module and the third drive train with the third drive 6 and other drives of a third control module. The control modules of the drive trains are preferably coupled via a data bus with the higher-level machine control unit data technology.

During operation, a motor torque signal and / or a motor current signal for the first drive 4, the second drive 5 and the third drive 6 are determined via suitable detection means. For example, in particular the motor current signal is detected by sensors, whereas the other operating parameters are determined or calculated model-based (sensorless drive). It is then in particular such that the detection means are formed as part of the control and the impressed motor current is detected directly for determining the motor current signal or that the motor torque signal is determined model-based from the operating parameters of the drive arrangement.

According to an alternative, not shown embodiment of the invention, the engine torque signal and the motor current signal can be detected by sensors. Suitable sensors, for example a rotational angle sensor, a rotational 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 in a functional and / or spatial manner in these. Likewise it can be provided that, for the model-based determination of the engine torque, the motor current on the one hand and the rotation angle and / or the rotational 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 (motor torque signal, motor current signal) of the drives 4, 5, 6 which are determined via 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 by comparing the operating signals with at least one reference signal state of the drive arrangement, which is stored in a reference data memory. Preferably, a plurality of reference signal states are stored in the reference data memory, which characterize, for example, a bearing defect for one of the drives 4, 5, 6 or a bearing defect for the supply supply 1 or the removal supply 2. In an analogous manner, further reference signal states may be provided to characterize the state of the drive arrangement. In particular, reference signal states can be stored in the reference data memory, from which a faulty fan, an imbalance in the drive train or defective electronics (controllers, frequency converters) of the drives can be inferred. For example, the Assessment of the system state of the drive arrangement via means of machine learning.

It can also be provided that corresponding operating signals for adjacent drives are determined and from a difference of the operating signals of the adjacent drives 4, 5, 6 is closed to a thread tension. It may 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, for example, can be stored in the reference data memory, which indicate a local thickening or damage to the textile 3. A local thickening may be caused by a node, for example.

Exemplary show the Fig. 2 to 4 the time course of engine torque signals, which are determined by the detection means of the drive assembly. In each case, the engine torque M is plotted over the time t.

A first example of the engine torque signal after Fig. 2 shows a periodically recurring engine torque signal, which is for example indicative of a bearing defect A of the associated drive 4, 5, 6. The motor torque signal is now processed and closed by comparing the values with the stored in the reference data memory reference signal states on the system state of the drive assembly.

To Fig. 3 a torque characteristic is disclosed in a further engine torque signal over time, which shows a node B in the textile 3 in interaction with a drive 4, 5, 6. Again, by comparing the engine torque signal with the stored reference signal states, the system state relative to the processed textile 3 is identified. For example, if the textile 3 has a node unscheduled, the production process can be stopped or interrupted at short notice. If, for example, a textile is processed with locally different thickness structure, the periodic signal can be used to monitor a planned or smooth production process.

A combination of system states after the FIGS. 2 and 3 is in the motor torque signal after Fig. 4 shown. Here meet a defective engine mount A and a node B in the textile together. The two events are detected by a pattern comparison carried out in particular in the evaluation unit and it can be provided, in particular, to stop the textile machine for repairing the bearing defect or for performing correctors on the textile 3.

Only exemplary show the Fig. 2 to 4 the engine torque signals over time. For evaluation purposes, a post-processing of the signal, a filtering or an extraction of characteristic dynamic variables can be carried out in particular. In particular, it may be provided that the engine torque signal and / or the motor current signal are transformed from the time domain into the frequency domain or otherwise reworked. The evaluation unit, the detection means or the controller have for this purpose the necessary computing means. For processing the motor torque signal or the motor current signal, in particular a Fourier analysis, a wavelet transformation, a waterfall diagram or the Empirical Mode Decomposition can be used.

Identical components and component functions are identified by the same reference numerals.

Claims (9)

Drive arrangement for a textile machine comprising a supply supply (1) for a textile (3), a removal storage (2) for the textile (3), a plurality of drives (4, 5, 6) combined in a functional network, which are located between the supply supply (1). 1) and the removal stock (2) are arranged, and with a controller, which is designed for driving the drives (4, 5, 6), wherein the controller with the drives (4, 5, 6) cooperates such that the drives acting jointly on the textile (3), characterized in that detection means are provided for determining a motor torque signal and / or a motor current signal for at least one of the drives (4, 5, 6) and that the motor torque signal and / or the motor current signal of an evaluation unit can be fed, wherein the evaluation unit is designed such that on the basis of the motor torque signal and / or the motor current signal, a system state of the drive assembly is identified by comparing the motor torque signal and / or the motor current signal with at least one stored in a reference data memory reference signal state of the drive assembly and / or that the system state of the drive assembly is determined by means of machine learning from the motor torque signal and / or the motor current signal. Drive arrangement according to claim 1, characterized in that the detection means are designed for sensorless determination of the motor torque signal. Drive arrangement according to claim 1 or 2, characterized in that the detection means for determining the motor torque signal and / or the motor current signal and / or the evaluation unit and / or the reference data memory are formed as part of the controller. Drive arrangement according to one of claims 1 to 3, characterized in that the controller and / or the evaluation unit provides for calculating means and is designed such that the motor torque signal and / or the motor current signal is transformed from the time domain into the frequency domain. Drive arrangement according to one of claims 1 to 4, characterized in that in the reference data memory a plurality of reference signal states is stored at least comprising a first reference signal state which a bearing defect for one of the drives (4, 5, 6) and / or for the supply supply (1 ) and / or for the removal stock (2), and / or a second reference signal state, which characterizes a local thickening of the textile (3), and / or a third reference signal state, which characterizes a crack of the textile (3). Drive arrangement according to one of claims 1 to 5, characterized in that the control is multi-stage and provides a higher-level machine control unit and a plurality of control modules, wherein the control modules are connected via a data bus to the machine control unit and wherein each drive (4, 5, 6 ) of the active compound cooperates with other control modules. Drive arrangement according to one of claims 1 to 6, characterized in that the control and / or the detection means and / or the evaluation unit are adapted to determine a first motor torque signal and / or a first motor current signal for a first drive (4) in the active network and a second motor torque signal and / or a second motor current signal for an adjacent, second drive (5) in the composite and a difference of the motor torque signals and / or the motor current signals, and that the controller is designed such that from the difference, a processing parameter for the textile, preferably a thread tension is determined. Drive arrangement according to one of claims 1 to 7, characterized in that the control and / or the detection means and / or the evaluation unit are designed for detecting features of the Motor torque signal and / or the motor current signal on the one hand and the reference signal state on the other hand and to compare these characteristics with respect to their similarity. Drive arrangement according to claim 8, characterized in that the control and / or the detection means and / or the evaluation unit is adapted to extract a plurality of features from the engine torque signal and / or the motor current signal on the one hand and the reference signal state on the other hand and to summarize the characteristics of the motor torque signal and / or the motor current signal on the one hand in a first feature vector and the reference signal state on the other hand in a second feature vector and for comparing the first feature vector with the second feature vector.

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