CN109667001B

CN109667001B - Method and device for monitoring the belt tension of a drive belt of a ring spinning machine

Info

Publication number: CN109667001B
Application number: CN201811193999.0A
Authority: CN
Inventors: G·赫伯特
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2017-10-17
Filing date: 2018-10-15
Publication date: 2022-07-12
Anticipated expiration: 2038-10-15
Also published as: JP7258511B2; ES2953684T3; EP3473756B1; JP2019073844A; CN109667001A; DE102017124132A1; EP3473756A1

Abstract

Method and apparatus for operating a ring spinning machine. The invention relates to a method and a device for monitoring the belt tension of a drive belt of a ring spinning machine having a plurality of thread positions, the spindles of the ring spinning machine being frictionally driven by an endless tangential belt during a spinning operation. According to the invention, a belt tension of the tangential belt is monitored by means of a sensor device which is connected to a machine control system of the ring spinning machine, wherein the belt tension data determined by means of the sensor device are processed in the machine control system and visualized by means of a display.

Description

Method and device for monitoring the belt tension of a drive belt of a ring spinning machine

Technical Field

The invention relates to a method and a device for monitoring the belt tension of a drive belt of a ring spinning machine having a plurality of thread positions, the spindles of the ring spinning machine being frictionally driven by a circulating tangential belt during a spinning operation.

Background

Spinning machines with a plurality of thread positions, the spindles of which are frictionally driven by an endless tangential belt, have been known for a long time in the textile industry.

Such multi-position spinning machines (e.g. ring spinning machines) usually have a plurality of identical work stations which are arranged next to one another on both sides of the longitudinal axis of the machine and whose working elements are jointly driven by endless traction elements of the machine length.

In the case of ring spinning machines, the individual workstations are each equipped with, for example, freely rotatably mounted spindles, and an endless tangential belt of machine length is usually used as a drive for a multitude of spindles. The tangential belt runs on the drive wheel of a spindle drive which is arranged, for example, approximately in the center of the machine and is connected to a frequency converter, and the tangential belt is guided over deflection rollers at the corners of the textile machine.

In order to ensure a reliable driving of the spindle reel of the spindle by means of the circulating tangential belt during the spinning operation, it must be ensured that the tangential belt always abuts against the spindle reel of the spindle with a sufficiently high contact pressure.

For example, a machine length tangential belt should always have a sufficiently high belt tension, since too low a belt tension would lead to the risk of so-called "caterpillar spindles" (schleichweindelen). In other words, if the belt tension is too low, the contact pressure of the tangential belt against the driving disks of the spindles, which ensures that the spindles are properly frictionally driven, is too low, resulting in the rotational speed of these spindles falling below the prescribed rotational speed level of the ring spinning machine.

Since the yarn material produced on such crawler spindles is usually scarcely available for further processing, attempts have long been made to prevent the occurrence of such crawler spindles as far as possible by means of various measures.

For example, it has long been common to provide manually operable tensioning devices in the region of the endless tangential belts of ring spinning machines. Typically, such manually operable tensioners are operated by the operator whenever the operator believes that the belt tension of the tangential belt is slightly decreasing, or the tensioner is routinely operated according to a prescribed schedule.

However, such a tensioning device does not ensure that the belt tension of the tangential belt is always optimally set during the entire spinning operation, and it does not allow the extension of the belt tension during the spinning operation to be traced back at a later time. This means that the operator cannot determine when the belt tension of, for example, a textile machine has which value.

In the textile industry, therefore, in connection with ring spinning machines, it is often the case that a relatively high belt tension of the tangential belt driving the spindles is used throughout the entire operating duration of the textile machine. In practice, however, too high a belt tension leads not only to unnecessarily high loads on the drive shaft and the deflection shaft of the drive and on the tangential belt itself, but also to an increase in the energy consumption of the ring spinning machine.

Furthermore, in the common machining and textile industries, methods and devices for measuring the tension of a belt or fabric are known.

For example, with regard to motor vehicles, DE 19616574 a1 describes the following method: the tension of the drive belt wound on a pulley of an engine of the motor vehicle is determined based on the resonant vibration frequency of the drive belt.

EP 0100394 a1 discloses a method for measuring and controlling the warp tension in a textile machine. In this known method, the propagation velocity of the transverse deflection along the beam is used as a measurement principle. That is to say, the actuator generates deflections which arrive at the sensor after a corresponding time interval.

As described in EP 0100394 a1, it may also be preferable to provide each textile machine with a plurality of actuators and sensors. However, this patent document does not indicate whether the determined warp tension value is visible to the operator in any way.

Furthermore, DE 3940923 a1 describes a textile machine which is usually provided with a plurality of work stations. The signaling device which outputs a corresponding fault signal when a fault occurs is associated with the workbench. The signaling device is connected to a machine control system of the textile machine with an indicating device which is connected to a so-called fault signal evaluation device. Based on the fault signal, the fault signal evaluation device initiates a control sequence, for example a normal shut-down sequence or an emergency shut-down sequence of the spinning machine.

The above-described method and device have proven themselves in practice, but in some cases are very complex and therefore costly. With regard to the monitoring of the belt tension of the drive belt of a ring spinning machine, the known methods and devices are only available under certain conditions and can be greatly improved.

Disclosure of Invention

In contrast to the above-mentioned prior art, the problem addressed by the present invention is to develop a belt tension of a tangential belt that ensures reliable monitoring of the machine length in a simple manner and that is visible to the operator during the entire operating time of the spinning machine.

According to the invention, this problem is solved by monitoring the belt tension of the tangential belt by means of a sensor device connected to the machine control system of the ring spinning machine, wherein the belt tension data determined by means of the sensor device are processed in the machine control system and visualized by means of a display.

Advantageous embodiments of the method according to the invention and of the apparatus for carrying out the method are the subject matter of the dependent claims.

The method according to the invention not only has the following advantages: the operator is informed of the current belt tension data of the spinning machine at any time and, taking into account the visual indication on the display, can ensure that the belt tension data is always kept within the best specifiable range suitable for the production of the spinning bobbin, and also has the advantage that, if necessary, the operator can also determine at any later time what belt tension data is present at the ring spinning machine at a certain moment. This means that if there is a risk that the specified belt tension data can no longer be maintained on the ring spinning machine in the foreseeable future (for example because the tangential belt is lengthened due to ageing), the operator can start replacing the tangential belt in good time. If necessary, any faulty spinning bobbin can also be deduced from the belt tension data stored in the machine control system.

In an advantageous embodiment, provision is made for the machine control system to start to react if it is determined that the belt tension data of the tangential belt is likely to reach a specifiable minimum or a specifiable maximum. This means that the machine control system ensures that a warning device perceptible to the operator is triggered.

In practice, the machine control system instructs the operator to intervene, for example by means of an optical signal such as a relatively distinct flash. However, the warning may also take the form of an acoustic signal, which the operator likewise understands as a sign that human intervention should occur as soon as possible. In other words, the warning signal is used to urge the operator to slightly increase the tension of the tangential belt, for example by means of the belt tensioner.

Such belt tensioners typically have a slidably mounted pulley that can be positioned in a prescribed manner either manually or by means of an electrically actuated drive. Such a belt tensioner is known per se not only with high reliability but also with excellent functionality.

However, in an alternative embodiment, provision may also be made for the machine control system to ensure, independently, that the ring spinning machine is automatically switched off immediately if necessary. In this case, it is reliably ensured that the ring spinning machine is always operated only with a suitable belt tension of the tangential belt of the ring spinning machine.

In an advantageous embodiment, provision is made for the machine control system to record the belt tension data both during the spinning operation and during the doffing process of the ring spinning machine. In this manner, if necessary, an operator can easily fully track the belt tension data of the tangential belt throughout its useful life and draw conclusions regarding the operation of subsequent tangential belts, for example.

In an advantageous embodiment, provision is made for the maximum, minimum and average belt tension values of the tangential belt and the position of the ring rail (ring rail) of the ring spinning machine to be shown on a display of the machine control system during the spinning operation of the ring spinning machine. This means that the operator can easily draw conclusions about the tangential belt running behavior at any time on the basis of the belt tension value shown on the display and can immediately correct the belt tension if necessary.

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 the machine control system of the ring spinning machine; the machine control system processes the determined belt tension data and has a display on which belt tension data for the tangential belt may be visible.

This means that the operator is informed at any time of the current belt tension data of the ring spinning machine and, taking into account the visual indication on the display, can ensure not only that the belt tension data always remains within the best specifiable range for the production of the spinning bobbin, but also that the tangential belt is replaced in good time when there is a risk (for example because it lengthens due to ageing) that the specified belt tension data can no longer be maintained at the ring spinning machine in the foreseeable future. Furthermore, the operator can subsequently determine what belt tension data are present at the ring spinning machine at a certain moment in time, and from said belt tension data stored in the machine control system, conclusions can be drawn about any faulty spinning bobbin.

In a further advantageous embodiment, the sensor device has a movably mounted deflection roller corresponding to the ballast sensor unit. This means that during the spinning operation, the movably mounted deflection roller is positioned according to the belt tension of the tangential belt of the ring spinning machine and this positioning is registered by the ballast sensor unit and converted into corresponding signals which are forwarded to the machine control system of the ring spinning machine.

In a further advantageous embodiment, a measuring amplifier is connected to the ballast sensor unit and to the machine control system of the ring spinning machine. This means that the signals initiated by the ballast sensor unit are first processed in a measuring amplifier, so that the signals can be forwarded to the machine control system downstream of the ring spinning machine, which is equipped with a display, and can be appropriately processed there. Such that the belt tension value determined by the ballast sensing unit is visible to an operator on a display of the machine control system.

Drawings

Further details of the invention can be taken from the embodiment examples described below on the basis of the figures.

In the drawings:

FIG. 1 shows a schematic top view of a ring spinning machine with a circulating tangential belt for frictionally driving the spindles of a work head of the ring spinning machine and a sensor device for monitoring the belt tension of the tangential belt, which sensor device is connected to a machine control system of the ring spinning machine,

fig. 2 shows a machine control system of a ring spinning machine equipped with a display, and a sensor device shown on a larger scale connected to the machine control system.

Fig. 3 shows a display arranged in the region of a machine control system of a ring spinning machine, on which various data about the tangential belt generated during the spinning operation of the ring spinning machine are visible.

Fig. 4 shows the display according to fig. 3, on which further belt tension data of the tangential belt generated during the spinning operation of the ring spinning machine are visible.

Fig. 5 shows the display according to fig. 3 with the belt tension data generated during the doffing process at the ring spinning machine.

Detailed Description

Fig. 1 shows a highly schematic top view of a ring spinning machine 1, the spindles of which ring spinning machine 1 are frictionally driven by an endless tangential belt. The ring spinning machine 1 has a plurality of work stations on both machine longitudinal sides, which are each equipped with such a spindle 2. As is known and therefore not described in more detail, a so-called ring-spun bobbin is produced on the spindle 2; the ring spinning bobbin has relatively little yarn material and is therefore rewound on a so-called automatic winder to form a cross-wound package in a subsequent production step.

The spindles 2 of the ring spinning machine 1 are freely rotatably mounted and are frictionally driven by an endless tangential belt 3 acting on the driving spindle disc of each spindle 2. In order to ensure a specific contact pressure of the tangential belt 3 against the driving disks of the spindles 2, usually, so-called press rolls 4 are additionally provided between the spindles 2; said pressure rollers 4, preferably arranged in pairs in respective spring elements 19, contact the endless tangential belt 3 with a certain pressure.

In the embodiment example shown, the machine length of the tangential belt 3 runs during the cycle over four deflecting rollers 5 arranged at the machine corners, a drive wheel 7 arranged on the motor shaft of the spindle drive 6 and a pulley 8 of the belt tensioning device 27. The pulley 8 is mounted for linear movement and can be adjusted either manually by the operator or, as in the present embodiment example, by means of an actuating drive 10, which actuating drive 10 is preferably designed as a motor drive 11. The pulley 8 is connected to a motor drive 11, for example, by means of a spindle drive 9. In this case, the actuating drive 10 of the belt tensioning device 27 is then also connected to the machine control system 13 of the ring spinning machine 1 via the control line 20.

Furthermore, for monitoring the belt tension of the tangential belt 3, a sensor device 12 equipped with a ballast sensor unit 15 is provided, said sensor device 12 likewise being connected to the machine control system 13 of the ring spinning machine 1 via a signal line 21. As can be seen, the machine control system 13 has a display 23.

In practice, it is common to drive the spindles 2 of a ring spinning machine 1 by means of a plurality of tangential belts 3, whereby a separate spindle drive 6 acts on each of the tangential belts 3. This means that modern ring spinning machines 1 with up to two thousand or more spindles 2 often have up to 18 spindle drives 6, each of which then drives 96 to 120 spindles 2 by means of the tangential belt 3.

The positioning of the sensor device 12 shown in fig. 1 is also only one possible embodiment example. This means that the sensor device 12 does not have to be arranged at all in the region of the upper right deflection corner of the tangential belt 3 as shown in fig. 1, but can also be placed without any problem in the region of one of the other deflection corners of the tangential belt 3.

In fig. 2, a sensor device 12 is shown on a larger scale, by means of which sensor device 12 the belt tension of the tangential belt 3 is monitored. As indicated, the sensor device 12, which is connected to the spindle rail (not shown) of the ring spinning machine 1 by means of the retaining plate 18 and the fastening device 14, such as a threaded bolt, has a movably mounted deflection roller 5 corresponding to the ballast sensor unit 15. The ballast sensor unit 15 is connected to the machine control system 13 of the ring spinning machine 1 via a signal line 21, and a measuring amplifier 22 is connected to the ballast sensor unit 15. The deflection roller 5 is arranged on a support 16, which support 16 in turn is mounted for limited rotation about an axis 17.

During operation of the ring spinning machine 1, the circulating tangential belt 3 provided with a certain belt tension acts continuously on the deflection roller 5 towards the ballast sensor unit 15, and this is registered by the ballast sensor unit 15 and converted into a corresponding electrical signal S. The ballast sensor unit 15 is designed such that the ballast sensor unit 15 immediately registers the belt tension of the tangential belt 3 irrespective of the running direction of the tangential belt 3. This means that the belt tension of the tangential belt 3 can be reliably detected at all times by means of the ballast sensor unit 15, regardless of whether the ring spinning bobbin is S-twisted or Z-twisted.

The electrical signals S of the ballast sensor units 15 are first processed in a measuring amplifier 22 and then forwarded via a signal line 21 to the machine control system 13 of the ring spinning machine 1. As can be seen, the machine control system 13 has a display 23, as explained in more detail below on the basis of fig. 3, 4 and 5, the belt tension data of the tangential belt 3 recorded by the ballast sensor unit 15 and processed in the machine control system 13 are visible on the display 23 in various ways.

For example, a first possibility for data to be visible on a display 23 of the machine control system 13 is shown in fig. 3. As can be seen, the display 23 shows, among other things, the object for monitoring the belt tension of the tangential belt 3. In the present case, for example, the image of the sensor device 12 is shown in the center of the display. On the left various numerical indications 40-43 are shown in relation to the set values of e.g. the tangential belt 3, while on the right numerical indications 44-47 are shown in relation to the limit values of the belt tension. Furthermore, a bar graph 24 is shown, which bar graph 24 is divided into different (in the present embodiment example, five) measurement ranges 28-32 of one above the other in relation to the belt tension of the tangential belt 3.

In the upper measuring range, which is designated by reference numeral 28, a comparatively high belt tension value is recorded, for example, which corresponds to the machine control system 13, for example, when the ring spinning machine 1 is closed immediately in order to avoid eventual damage.

The measurement range below this, marked with 29, is the so-called alarm range. The belt tension values listed in measurement range 29 are also slightly too high. If the belt tension value reaches said measurement range 29, the machine control system 13 of the ring spinning machine 1 triggers an alarm.

The intermediate measuring range 30 represents a suitable belt tension value, i.e. the belt tension value that the tangential belt 3 should have during the spinning operation.

The measurement range 31 below this is likewise a warning range. The belt tension values listed in measurement range 31 are slightly too low. The machine control system 13 of the ring spinning machine 1 therefore triggers an alarm if the belt tension value falls into the measurement range 31. The lower part of the bar 24 is formed by a measuring range 32, which measuring range 32 represents a comparatively low value of the belt tension, i.e. a corresponding value of the belt tension at which normal operation of the ring spinning machine 1 is no longer possible in any case. When the measuring range 32 is reached, the machine control system 13 therefore immediately shuts down the ring spinning machine 1.

In addition, the current belt tension value of the tangential belt 3 is indicated continuously in a similar manner by means of an indicating element (e.g. arrow 25, etc.) movable along the bar graph 24.

The indication 40 shown on the left side of the display indicates in numerical form the current belt tension value which is shown in a similar manner in the bar graph 24 by means of the arrow 25. The indication 41 shows by means of a curve how the belt tension changes during a certain past time period. The

numerical indications

42, 43 each disclose an advantageous correction factor or indicate a specific calibration value.

As already indicated above, the numerical indications 44-47 shown in the area of the bar graph 24 indicate various limit values of the belt tension of the tangential belt 3, i.e. corresponding belt tension values at which a specific reaction of the machine control system 13 takes place. Fig. 4 and 5 disclose other visual possibilities for the display 23 of the machine control system 13.

Fig. 4 shows a display 23 presenting a graph 33 in which, during the spinning process, the variations of the various belt tension values of the tangential belt 3 over a certain duration are illustrated.

As can be seen, the graph 33 has a horizontal X-axis and a vertical Y-axis. The time course of the spinning process is shown in days on the X-axis, while the belt tension value (unit: N) of the tangential belt 3 or the height (unit: mm) of the ring rail of the ring spinning machine 1 is indicated on the vertical Y-axis.

Curve 34, labeled with reference numeral 34, discloses the variation of the maximum belt tension value, while curve 35 illustrates the variation of the minimum belt tension value of the tangential belt 3. Curve 36 accordingly shows the change in the average belt tension value of the tangential belt 3. In addition, the change in the position of the ring plate of the ring spinning machine 1 during the spinning process is shown by the curve 37.

Fig. 5 shows a display 23 presenting a graph 33 illustrating the change of the belt tension during the doffing process of the ring spinning machine 1.

Here, too, the graph 33 has a horizontal X-axis and a vertical Y-axis. The time course of the doffing process (unit: min) is shown on the X-axis, while the value of the belt tension (unit: N) is indicated on the vertical Y-axis. Curve 34 shows the change in the belt tension value during the doffing process.

List of reference symbols

1 Ring spinning machine

Spindle 2

3 tangential belt

4 press roll

5 deflection roller

6 spindle driver

7 driving wheel

8 belt wheel

9 screw driver

10 actuating drive

11 Motor driver

12 sensor device

13 machine control system

14 fastening device

15 ballast sensing unit

16 support

17 axle

18 holding plate

19 spring element

20 control wire

21 signal line

22 measuring amplifier

23 display

24 bar graph

25 arrow head

27 belt tensioner

28 measuring range

29 measurement range

30 measuring range

31 measurement range

32 measurement range

33 graph

34 curve line

Curve 35 of

Curve 36

Curve 37

38 curve

40 numeral indication

41 denotes

42 numerical indication

43 numerical indication

44 numeral indication

45 number indication

46 numeral indication

47 numeral indication

S electric signal

Claims

1. A method for monitoring the belt tension of a drive belt of a ring spinning machine (1) having a plurality of thread positions, the spindles (2) of the ring spinning machine (1) being frictionally driven by a circulating tangential belt (3) during a spinning operation,

it is characterized in that the preparation method is characterized in that,

monitoring the belt tension of the tangential belt (3) by means of a sensor device (12), the sensor device (12) being connected to a machine control system (13) of the ring spinning machine (1), wherein belt tension data determined by means of the sensor device (12) are processed in the machine control system (13) and visualized by means of a display (23) and an indication (41) of the display (23) shows by means of a curve how the belt tension changes during a certain past period of time, and wherein during the spinning operation of the ring spinning machine (1) maximum, minimum and average belt tension values of the tangential belt (3) and the position of a steel collar of the ring spinning machine (1) are shown on the display (23) of the machine control system (13), and the sensor device (12) has a movably mounted deflection roller (5) corresponding to a ballast sensing unit (15) ).

2. Method according to claim 1, characterized in that the machine control system (13) starts to react if it is determined that the belt tension data of the tangential belt (3) is about to reach a specifiable minimum or a specifiable maximum.

3. Method according to claim 2, characterized in that the machine control system (13) ensures that a warning device perceptible to an operator is triggered.

4. Method according to claim 2, characterized in that the machine control system (13) ensures that the ring spinning machine (1) is shut down.

5. Method according to claim 1, characterized in that the machine control system (13) records the belt tension data of the tangential belt (3) both during the spinning operation of the ring spinning machine (1) and during the doffing process.

6. An apparatus for carrying out the method according to claim 1, characterized in that the sensor device (12) monitoring the belt tension of the tangential belt (3) of the ring spinning machine (1) is connected to a machine control system (13) of the ring spinning machine (1); the machine control system (13) processes the determined belt tension data and has a display (23), the belt tension data of the tangential belt (3) and the position of the ring rail of the ring spinning machine (1) can be displayed on the display (23) and an indication (41) of the display (23) shows by means of a curve how the belt tension changes during a certain past time period, and the sensor device (12) has a movably mounted deflection roller (5) corresponding to a ballast sensor unit (15).

7. An apparatus according to claim 6, characterized in that a measuring amplifier (22) is connected to the ballast sensing unit (15) and that the measuring amplifier (22) is also connected to the machine control system (13) of the ring spinning machine (1).