EP3473756A1 - Method and device for operating a ring-spinning frame - Google Patents

Abstract

The present invention relates to a method and a device for monitoring the belt tension of the drive belt of a ring spinning machine, which has a plurality of spinning stations, the spindles are frictionally driven during the spinning operation by a rotating tangential.

According to the invention, the belt tension of the tangential belt is monitored by a sensor device which is connected to a machine control of the ring spinning machine, the belt tension data determined by the sensor device being processed in the machine control and visualized via a display.

Description

The present invention relates to a method and a device for monitoring the belt tension of the drive belt of a ring spinning machine, which has a plurality of spinning stations, the spindles of which are frictionally driven by a rotating tangential belt during the spinning operation.

In the textile industry spinning machines, which have a plurality of spinning stations whose spindles are frictionally driven by a rotating tangential belt, have long been known.

Such multi-point spinning machines, for example, ring spinning machines, generally have a plurality of identical jobs, which are arranged side by side on both sides of the machine longitudinal axis and their working organs are driven together by machine-length, continuous Endloszugmittel.

In ring spinning machines, the individual jobs are, for example, each equipped with a freely rotatably mounted spindle, as a drive means for the numerous spindles usually a machine-long, circumferential tangential belt is used. The tangential belt runs over the drive wheel of an eg. Machine centrally arranged, connected to a frequency converter spindle drive and is guided at the corners of the textile machine in each case via a pulley.

In order to ensure reliable entrainment of the whorls of the spindles by the rotating tangential belt during spinning operation, it must be ensured that the tangential belt always rests with a sufficiently high contact pressure on the whorls of the spindles.

The machine-length tangential belt should, for example, always have a sufficiently high belt tension, because if the belt tension is too low, there is a risk of so-called dobby spindles occurring. That is, if the belt tension is too low, the abutment pressure of the tangential belt, which provides for proper frictional entrainment of the spindle, is too low at the drive whirl of the spindle, with the result that the speed of these spindles falls below a predetermined speed level of the ring spinning machine.

Since the yarn material created on such dobby spindles is often almost unusable for further processing, efforts have been made for a long time to prevent the occurrence of such dobby spindles as far as possible by various measures.

For example, it has been customary for some time to provide a manually operated clamping device in the area of the rotating tangential belt of a ring spinning machine. Such manually operable jigs are usually operated by the operator either whenever the operator considers that the belt tension of the tangential belt has dropped somewhat, or the jig is operated routinely according to a predetermined schedule.

With such tensioning devices, however, it is neither necessary to ensure that the belt tension of the tangential belt is always optimally adjusted during the entire spinning operation, nor is it possible to trace with such tensioning devices at a later point in time how the course of the belt tension was during the spinning operation. That is, the operator can z. B. does not determine when the belt tension of the textile machine had what value.

In the textile industry, it is therefore widespread in connection with ring spinning machines, that during the entire operating life of the textile machine is constantly working with a relatively high belt tension of the spindles driving tangential. In practice, too high a belt tension, however, not only leads to an unnecessarily high load on the drive and deflection shafts of the drive device and the tangential belt itself, but also to an increased energy consumption of the ring spinning machine.

Furthermore, both in general mechanical engineering, as well as in the textile industry, methods or devices for measuring the tension of a belt or a textile fabric known.

In the DE 196 16 574 A1 For example, in the context of automobiles, a method is described in which the tension of a drive belt wrapping a belt pulley of the automobile engine is determined on the basis of the resonant vibration frequency of the drive belt.

By the EP 0 100 394 A1 a method for measuring and controlling the warp tension in weaving machines is known. In this known method, the propagation velocity of transverse deflections along a warp sheet is used as the measuring principle. The That is, a pathogen generates deflections that arrive at a pickup after a corresponding time interval.

Like in the EP 0 100 394 A1 described, may preferably be provided per loom several exciters and transducers. However, the patent does not contain any indications as to whether the determined warp tension values are in any way made visible to the operating personnel.

Furthermore, in the DE 39 40 923 A1 Spinning machines described, which, as usual, have a variety of jobs. The work stations are assigned signalers that emit appropriate error signals when errors occur. The signal transmitters are connected to the machine control of the spinning machines, which has a display device which is connected to a so-called error signal evaluation device. The error signal evaluation device initiates, depending on the error signal, a specific control process, for example a regular shutdown program of the spinning machine or an emergency shutdown program.

The methods and devices described above have been well proven in practice, but are sometimes quite expensive and therefore costly. In connection with the monitoring of the belt tension of the drive belt of a ring spinning machine, the known methods and devices are only conditionally usable and can be improved.

Based on the aforementioned prior art, the present invention seeks to develop a method and a device that ensures the reliable monitoring of the belt tension of the machine-long tangential belt during the entire operating time of a ring spinning machine in a simple manner and makes it visible to the operator.

This object is achieved in that the monitoring of the belt tension of the tangential by a sensor device which is connected to a machine control of the ring spinning machine, wherein the determined by the sensor device belt tension data processed in the machine control and visualized via a display.

Advantageous embodiments of the method according to the invention and of the device for carrying out the method are the subject matter of the subclaims.

The method according to the invention not only has the advantage that the operating personnel are informed at all times about the instantaneous belt tension data of the ring spinning machine and, taking account of the display visible on the display, can ensure that the belt tension data is always kept within a predefinable range which is optimal for proper spinning cop production If necessary, the operating personnel can at any time subsequently determine which belt tension data were present at the ring spinning machines at a specific point in time. That is, the operating personnel can, if there is a risk that the specified belt tension data on the ring spinning machine can no longer be maintained in the foreseeable future, because z. B. the Tangentialriemen is age-related, in time to initiate a Tangentialriemenwechsel. In addition, if necessary from the belt tension data stored in the machine control, conclusions can also be drawn about any defective spinning cops.

In an advantageous embodiment, it is provided that the machine control, when it is determined that the belt tension data of the tangential belt threaten to reach predetermined minimum or predefinable maximum values, initiates a reaction. That is, the machine control ensures that a perceptible for the operator warning device is triggered.

In practice, the machine control z. B. on the basis of an optical signal, for example. By a relatively conspicuous flashing light that an intervention by the operator is advised. However, the warning can also be in the form of an acoustic signal, which is also understood by the operator as a sign that a manual intervention should be done as quickly as possible. That is, the operator is stopped by a warning signal, the tangential belt, for example. By means of a belt tensioning device to stretch a little more.

Such belt tensioners usually have a slidably mounted pulley, which can be positioned either manually or by means of an electric actuator defined. Such, known per se belt tensioning device are characterized not only by a high reliability, but also by an excellent functionality.

In an alternative embodiment, however, it may also be provided that the machine control system automatically ensures that the ring spinning machine is automatically switched off immediately if necessary. In such a case, it is reliably ensured that the ring spinning machine is always operated only with a proper belt tension of its tangential belt.

In an advantageous embodiment, it is further provided that the machine control records the belt tension data both during the spinning operation and during the doffing process of the ring spinning machine. In this way, it is easily possible that the operator if necessary, trace the belt tension data of the tangential seamlessly over its entire life of the tangential and thereby z. B. draw conclusions on the operation of subsequent tangential belt.

In a further advantageous embodiment, it is provided that during the spinning operation of the ring spinning machine on the display of the machine control, the maximum, the minimum, the average belt tension values of the tangential belt and the positions of the ring rail of the ring spinning machine are displayed. This means that the operating personnel can easily draw conclusions about the running behavior of the tangential belt at any time on the basis of the belt tension values shown on the display and, if necessary, immediately intervene in the belt tension to correct them.

The device for carrying out the method according to the invention has a sensor device which monitors the belt tension of the tangential belt of the ring spinning machine and is connected to a machine control of the ring spinning machine, which processes the belt tension data determined and has a display on which the belt tension data of the tangential belt can be visualized.

This means that the operator is informed at all times about the instantaneous belt tension data of the ring spinning machine and can not only always ensure that the belt tension data are always kept within a predefinable range, which is optimal for a proper spinning cop production, taking account of the display visible on the display , if there is a risk that the specified belt tension data on the ring spinning machine can no longer be maintained in the foreseeable future, because z. B. the Tangentialriemen is age-related, in time for a Tangentialriemenwechsel. Furthermore, the operating personnel can also subsequently determine which belt tension data was present at the ring spinning machines at a specific point in time and draw conclusions about possibly defective spinning cops from these belt tension data stored in the machine control.

In a further advantageous embodiment, the sensor device has a movably mounted deflection roller which corresponds to a pressure measuring cell. That is, during the spinning operation the movably mounted deflection roller is positioned as a function of the respective belt tension of the tangential belt of the ring spinning machine, which is registered by the pressure cell and converted into corresponding signals, which are forwarded to the machine control of the ring spinning machine.

In a further advantageous embodiment, a measuring amplifier is connected to the pressure cell and this connected to the machine control of the ring spinning machine. This means that the signals initiated by the pressure cell are initially processed in the measured value amplifier in such a way that the signals can be forwarded to the downstream machine control of the ring spinning machine equipped with a display and processed properly there. On the display of the machine control system, the belt tension values determined by the load cell are made visible to the operating personnel.

Further details of the invention are the following explained with reference to the drawings embodiments.

Fig. 1

in Draufsicht, schematisch eine Ringspinnmaschine, die einen umlaufenden Tangentialriemen zum reibschlüssigen Antreiben der Spindeln ihrer Arbeitsstellen sowie eine an die Maschinensteuerung der Ringspinnmaschine angeschlossene Sensoreinrichtung zur Überwachung der Riemenspannung des Tangentialriemens aufweist,

Fig. 2

die mit einem Display ausgestattete Maschinensteuerung der Ringspinnmaschine sowie die an die Maschinensteuerung angeschlossene Sensoreinrichtung in einem größeren Maßstab,

Fig. 3

das im Bereich der Maschinensteuerung der Ringspinnmaschine angeordnete Display, auf dem verschiedene, während des Spinnbetriebes der Ringspinnmaschine auftretende, den Tangentialriemen betreffende Daten, visualisiert sind,

Fig. 4

das Display gemäß Fig. 3, auf dem weitere während des Spinnbetriebes der Ringspinnmaschine auftretende Riemenspannungsdaten des Tangentialriemens visualisiert sind,

Fig. 5

das Display gemäß Fig. 3, mit Riemenspannungsdaten, wie sie während eines Doffvorganges an der Ringspinnmaschine auftreten.

It shows:

Fig. 1

in plan view, schematically a ring spinning machine having a circumferential tangential belt for frictionally driving the spindles of their jobs and a connected to the machine control of the ring spinning machine sensor device for monitoring the belt tension of the tangential,

Fig. 2

the machine control of the ring spinning machine equipped with a display and the sensor device connected to the machine control on a larger scale,

Fig. 3

the display arranged in the area of the machine control of the ring spinning machine, on which various data relating to the tangential belt occurring during the spinning operation of the ring spinning machine are visualized,

Fig. 4

the display according to Fig. 3 on which further belt tension data of the tangential belt occurring during the spinning operation of the ring spinning machine are visualized,

Fig. 5

the display according to Fig. 3 , with belt tension data, as they occur during a Doffvorganges on the ring spinning machine.

The Fig. 1 shows in plan view, very schematically, a ring spinning machine 1, the spindles 2 are frictionally driven by a rotating tangential belt 3. Such ring spinning machines 1 have on both longitudinal sides of the machine a plurality of jobs, which are each equipped with such a spindle 2. On these spindles 2, as is known and therefore not explained in more detail, so-called ring spinning cops are produced, which have relatively little yarn material and are therefore wound in a downstream production process, on so-called cross-winding machines, into cross-wound bobbins.

The spindles 2 such ring spinning machines 1 are freely rotatably mounted and are frictionally driven by the rotating tangential belt 3, each of which acts on a Antriebswirtel the spindles 2. In order to ensure a certain contact pressure of the tangential 3 to the whorls of the spindles 2, so-called pressure rollers 4 are usually provided between the spindles 2, which preferably arranged in pairs on a spring element 19, with some pressure on the rotating tangential 3.

In the illustrated embodiment, a machine-long tangential 3 runs during a cycle on four, each machine corner arranged pulleys 5, arranged on the motor shaft of a spindle drive 6 drive wheel 7 and a pulley 8 a belt tensioning device 27. The pulley 8 is mounted linearly adjustable and can either be adjusted manually by the operator, or, as shown in the present embodiment, via an actuator 10, which is preferably designed as an electric motor drive 11. The pulley 8 is, for example, connected via a screw drive 9 to the electric motor drive 11. The actuator 10 of the belt tensioning device 27 is then also connected in such a case via a control line 20 to the machine control 13 of the ring spinning machine 1.

For monitoring the belt tension of the tangential belt 3, a sensor device 12 equipped with a pressure measuring cell 15 is furthermore provided, which is likewise connected to the machine control 13 of the ring spinning machine 1 via a signal line 21, which, as can be seen, has a display 23.

In practice, it is common to drive the numerous spindles 2 of a ring spinning machine 1 by a plurality of tangential belts 3, which in turn each by a separate spindle drive 6 are applied. That is, modern ring spinning machines 1, which have up to two thousand and more spindles 2, often have up to eighteen of these spindle drives 6, which then in turn drive via a tangential belt 3 from ninety-six to one hundred and twenty spindles 2.

Also in Fig. 1 shown positioning of the sensor device 12 is only one possible embodiment. That is, the sensor device 12 by no means, as in Fig. 1 can be arranged in the region of the right upper Umlenkecke the tangential 3, but can also be easily positioned in the region of one of the other Umlenkecken the tangential 3.

In Fig. 2 is the sensor device 12, with which the belt tension of the tangential belt 3 is monitored, on a larger scale. As indicated, the sensor device 12, via a holding plate 18 and fastening means 14, z. B. bolts, is connected to a (not shown) spindle bank of the ring spinning machine 1, a movably mounted guide roller 5, which corresponds to a pressure cell 15. The pressure cell 15 is connected to the machine control 13 of the ring spinning machine 1 via a signal line 21, in which a measured value amplifier 22 is turned on. The deflection roller 5 is arranged on a holder 16, which in turn is limited rotatably mounted about an axis 17.

During operation of the ring spinning machine 1, the guide roller 5 is constantly acted upon by the rotating, provided with a certain belt tension tangential 3 in the direction of the pressure cell 15, which registers the pressure cell 15 and converts into corresponding electrical signals S. The pressure cell 15 is designed so that it, regardless of the direction of the tangential belt 3, registered changes in the belt tension of the tangential 3 immediately. That is, with the pressure cell 15, the belt tension of the tangential belt 3 is always reliably monitored regardless of whether ring spinning cops are made with S or Z rotation.

The electrical signals S of the pressure cell 15 are first processed in the measured value amplifier 22, before they are forwarded via the signal line 21 to the machine control 13 of the ring spinning machine 1. As can be seen, the machine controller 13 has a display 23 on which the registered by the load cell 15 and processed in the machine control 13 belt tension data of the tangential belt 3, as described below with reference to Figures 3 . 4 and 5 explained in more detail, visualized in different ways.

In Fig. 3 For example, a first visualization option of data on the display 23 of the machine controller 13 is shown. As can be seen, the display 23 shows, inter alia, the object used to monitor the belt tension of the tangential belt 3. In the present case, in the middle of the display z. B. an image of the sensor device 12 is shown. On the left side are different, z. For example, setting values of the tangential belt 3 are shown in relation to digital displays 40-43, while digital displays 44-47, which concern the limit values of the belt tension, are shown on the right. Furthermore, a bar diagram 24 is shown, which is divided into different, in the present exemplary embodiment, five superimposed measuring ranges 28 - 32, which relate to the belt tension of the tangential belt 3.

For example, belt tension values which, when reached, the machine controller 13 immediately deactivates the ring spinning machine 1, for example also to avoid consequential damage, are documented in the upper measuring range denoted by reference numeral 28.

The underlying measuring range marked 29 represents a so-called warning range. Also the belt tension values listed in measuring range 29 are a bit too high. The machine control 13 of the ring spinning machine 1 triggers alarm when the belt tension values fall into this measuring range 29.

The middle measurement range 30 shows proper belt tension values, that is, belt tension values that the tangential belt 3 should have during spinning operation.

The underlying measuring range 31 again represents a warning range. The belt tension values listed in the measuring range 31 are somewhat too low. The machine control 13 of the ring spinning machine 1 therefore triggers an alarm when the belt tension values fall into the measuring range 31. The lower end of the bar graph 24 is formed by the measuring area 32, which still shows significantly lower belt tension values, that is, belt tension values at which proper operation of the ring spinning machine 1 is no longer possible in any case. Upon reaching the measuring range 32, the machine control 13 therefore switches off the ring spinning machine 1 immediately.

By a along the bar chart 24 movable display element, for. As an arrow 25 or the like, is also constantly displayed analog, which has the belt tension values of the tangential 3 immediately.

The display 40 shown on the left-hand side of the display shows the instantaneous belt tension value in digital form, shown analogously on the bar chart 24 with reference to the arrow 25. The display 41 shows by means of a curve how the belt tension has run during a certain, past period of time. The digital displays 42, 43 each reveal an advantageous correction factor or indicate a specific calibration value.

The digital displays 44-47 shown in the area of the bar graph 24 show, as already indicated above, various limit values of the belt tension of the tangential belt 3, that is, belt tension values at which a specific reaction of the machine control 13 takes place. The 4 and 5 reveal further visualization possibilities of the display 23 of the machine control 13.

The Fig. 4 shows the display 23 with the representation of a diagram 33, on which the course of different belt tension values of the tangential belt 3 is clarified during the spinning process over a certain period of time.

As can be seen, the diagram 33 has a horizontal X-axis and a vertically arranged Y-axis. The time sequence of the spinning process in days is shown on the X axis, while the values of the belt tensions of the tangential belt 3 in N and the height of the ring rail of the ring spinning machine 1 in mm are indicated on the vertical Y axis.

The curve 34 identified by the reference numeral 34 reveals the profile of the respective maximum belt tension values, while the curve 35 illustrates the course of the respective minimum belt tension values of the tangential belt 3. Curve 36 accordingly shows the progression of the mean belt tension values of tangential belt 3. Curve 37 also shows the course of the positions of the ring rail of ring spinning machine 1 during the spinning process.

The Fig. 5 shows the display 23 with the representation of a diagram 33, on which the course of the belt tension during a Doffvorganges the ring spinning machine 1 is illustrated. Again, the diagram 33 has a horizontal X-axis and a vertically arranged Y-axis. On the X-axis is the time sequence of a Doffvorganges in min. while the values of the belt tensions are displayed in N on the vertical Y axis. The curve 34 shows the course of the belt tension values during a doffing process. <B> LIST OF REFERENCES </ b> 1 Ring spinning machine 2 spindle 27 Belt tensioner 3 tangential 28 measuring range 4 pressure roller 29 measuring range 5 idler pulley 30 measuring range 6 spindle drive 31 measuring range 7 drive wheel 32 measuring range 8th pulley 33 diagram 9 screw drive 34 Curve 10 actuator 35 Curve 11 E-drive 36 Curve 12 sensor device 37 Curve 13 machine control 38 Curve 14 fastening device 15 Load cell 40 Digital display 16 holder 41 display 17 axis 42 Digital display 18 retaining plate 43 Digital display 19 spring element 44 Digital display 20 control line 45 Digital display 21 signal line 46 Digital display 22 Measuring amplifier 47 Digital display 23 display 24 bar graph S electrical signals 25 arrow

Claims (9)

Method for monitoring the belt tension of the drive belt of a ring spinning machine (1), which has a multiplicity of spinning positions whose spindles (2) are frictionally driven by a revolving tangential belt (3) during the spinning operation,
characterized,
in that the belt tension of the tangential belt (3) is monitored by a sensor device (12) which is connected to a machine control (13) of the ring spinning machine (1), the belt tension data determined by the sensor device (12) being processed in the machine control (13) and be visualized via a display (23). A method according to claim 1, characterized in that the machine controller (13), if it is determined that the belt tension data of the tangential belt (3) threaten to reach predetermined minimum or predefinable maximum values, initiates a reaction. A method according to claim 2, characterized in that the machine control (13) ensures that a perceivable for the operator warning device is triggered. A method according to claim 2, characterized in that the machine control (13) ensures that the ring spinning machine (1) is turned off. Method according to one of the preceding claims, characterized in that the machine control system (13) records the belt tension data of the tangential belt (3) both during the spinning operation and during the doffing process of the ring spinning machine (1). A method according to claim 5, characterized in that during the spinning operation of the ring spinning machine (1) on the display (23) of the machine control (13) the maximum, the minimum, the mean belt tension values of the tangential belt (3) and the positions of the ring rail of the ring spinning machine ( 1) are displayed. Device for carrying out the method according to one of claims 1 to 6, characterized in that the sensor device (12), the belt tension of the Tangential belt (3) of the ring spinning machine (1) monitored, to a machine control (13) of the ring spinning machine (1) is connected, which processes the determined belt tension data and a display (23) on which the belt tension data of the tangential (3) can be visualized. Apparatus according to claim 7, characterized in that the sensor device (12) has a movably mounted deflection roller (5), which corresponds to a pressure cell (15). Apparatus according to claim 8, characterized in that connected to the pressure cell (15) has a measured value amplifier (22) and this with the machine control (13) of the ring spinning machine (1) is connected.

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