ES3010083T3 - Roving bobbin creel for a ring spinning machine - Google Patents

Abstract

The invention relates to a roving frame creel (2) for a ring spinning machine (1) with at least two rows of rovings formed by longitudinal beams (3) which can be equipped with roving bobbins (4), the longitudinal beams (3) being supported on vertical roving bars (9) by means of cross-sections (8). In order to ensure that the remaining operating time of the roving bobbins (4) suspended on the roving frame creel (2) can be easily retrieved at any time, the invention provides that the roving frame creel (2) is equipped with sensor units (6, 14) which measure the amount of roving present in the rows of rovings and transmit it to a computer device (7), which calculates the remaining operating time of the roving present on the roving frame creel (2). (Automatic translation with Google Translate, no legal value)

Description

DESCRIPTION

Roving bobbin creel for a ring spinning machine

The invention relates to a roving bobbin creel for a ring spinning machine with at least two rows of creels formed by spars, which can be equipped with roving bobbins, the spars being supported on vertical creel bars via cross-sections.

In connection with ring spinning machines, roving bobbin creels have been known for a long time in various embodiments and have been described in part in detail in numerous patent applications.

Document DE 297 12880 U1 describes, for example, a roving bobbin creel that has three rows of creels on each side of the machine of a ring spinning machine, each of which can be equipped with roving bobbins. The roving bobbins are connected to the stringers of the roving bobbin creel via so-called bobbin suspension beams, the stringers being supported on the vertical creel bars of the roving bobbin creel via cross sections. The rovings removed from the roving bobbins are then guided to the drafting tables of the ring spinning machine via different roving guides.

A comparable roving bobbin creel is also described in DE 102007 007864 A1. In this known roving bobbin creel, the roving bobbins are also connected to the stringers of the roving bobbin creel via bobbin suspension beams; however, in this case, the stringers are designed as suspension rails. Furthermore, the bobbin suspension beams are connected by connecting elements to form so-called suspension car trains, which ensure the timely supply of the ring spinning machine's workstations. This means that suspension car trains equipped with fresh roving bobbins before the start of a spinning process not only adequately supply fresh raw material but also quickly remove empty spinning tubes after the spinning process is completed.

Although these suspension car trains equipped with roving bobbins, which can be placed on the roving bobbin creel, ensure a good supply of fresh roving to the ring spinning machines during the ongoing spinning process, it is often relatively difficult to determine the exact moment when the roving bobbins have been used up and need to be replaced.

This means that with this type of roving bobbin fillet, calculating the so-called remaining running time of a batch of yarn is often relatively difficult and ultimately quite inaccurate.

As described in EP 0 321 404 B1, the amount of remaining yarn on the roving bobbin creel of a ring spinning machine is often calculated, for example, using the consumption of the ring spinning machine. The roving bobbin creel known from EP 0 321 404 B1, for example, has devices that measure the length of yarn unwound from the roving bobbins during the spinning process. From these measured lengths, the remaining yarn lengths on the roving bobbins are then calculated, and from these, the remaining operating time of the yarn batch. However, since this method always assumes that the roving bobbins are full, it is often not entirely clear how much yarn is actually available on the roving bobbin creel.

Various additional operating procedures have also been proposed in the past to optimize spinning mill operation, although they are often quite complex and therefore generally quite costly.

Document DE 3216218 A1 relates to methods and devices for operating a spinning or twisting machine with a large number of feed packages. In this regard, special designs and methods should ensure the optimal utilization of the machine, even during the unmanned period. In this regard, for example, before the start of an unmanned period, the remaining operating times of all feed packages can be determined, and the feed packages expected to be used up during the next unmanned period can be displayed for early replacement. Alternatively, the remaining operating times of all feed packages can be determined and a reduced machine speed calculated at which a selectable maximum number of feed packages to be discharged during the next unmanned period is not exceeded. In this regard, roving sensors connected to each feed reel and a running time calculator are used, for example.

This means that each of the numerous coil suspension beams for the feed coils is equipped with its own sensor unit. While such an implementation achieves extremely high accuracy in determining the remaining operating time, its implementation is relatively complex.

Document DE 3527473 A1 relates to a method and device for determining the fill level of a plurality of feed bobbins in the creel of a spinning or twisting machine. In this context, the diameter of the feed bobbins is scanned repeatedly in succession, each scanned diameter value is compared with a value corresponding to a minimum diameter, and an evaluation signal is triggered by a scanned diameter value if the value falls below the minimum diameter value. The device according to the invention is characterized by at least one light barrier in a conveyor device running parallel to a row of feed bobbins and moving at a predetermined speed, a measuring element connected to the light barrier, and a comparator connected to both the light barrier and the measuring element.

Document EP 0512 442 A1, for example, discloses a method and an auxiliary device comprising means for determining a production plan. The production plan provides for the distribution of a specific production quantity of a predetermined yarn to several machines, each of which also includes means for estimating the production quantity per unit of time.

EP 0541 483 A1 describes a comparable process control device in a textile mill. The spinning plant is equipped with a process control computer for a machine group, each machine in the group equipped with its own control device, which controls the machine's actuators. In this known process control device, a network is also provided, enabling bidirectional communication between the process control computer and each machine in the group.

However, there is still room for improvement in the known procedures and equipment, which are often quite complex, particularly with regard to determining the remaining operating time of the wick coils and, therefore, the exact time of replacing empty wick coils with new wick coils.

Based on the state of the art described above, the invention is therefore based on the objective of further developing a roving bobbin creel for a ring spinning machine, so that the exact remaining operating time of the roving bobbins located on the roving bobbin creel can be called up at any time without any problems.

According to the invention, this object is achieved in that the roving spool creel is equipped with sensor units, which detect the amount of roving present in the roving rows by means of measurement and transmit it to a calculation device, which calculates from this the remaining operating time of the roving located in the roving spool creel. According to the invention, the sensor units are arranged in the area of the stringers of the roving bobbin creel and detect the bending load of the corresponding stringer as a function of the weight of the roving bobbins, or the sensor units are installed in the area of the cross-sectional profiles of the roving bobbin creel and detect the bending stresses, which are introduced into the relevant sections of the cross-sectional profiles due to the weight of the roving bobbins, or the sensor units are arranged in each case in the area of the vertical creel bars of the roving bobbin creel and detect the contact pressure of the overlying cross-sectional profile, which in turn is loaded by the stringers, which receive the weight of the roving bobbins.

Advantageous embodiments of the invention are the subject of the dependent claims.

In particular, the roving bobbin creel configured according to the invention has the advantage that with such a roving bobbin creel, the remaining operating time of a batch of yarn located on the roving bobbin creel can be determined relatively easily. This means that by using a roving bobbin creel according to the invention, the time at which a roving bobbin change is to be initiated can be determined exactly, and thus the period of time during which the ring spinning machine is switched off, i.e., not producing, can be minimized. In general, the exact timing of the roving bobbin change can significantly improve the productivity of a ring spinning machine, particularly if frequent batch changes are required.

To ensure the most accurate calculation possible of the remaining operating time of the roving still in the roving spool creel, it is advantageous to first calibrate the sensor units when the roving spool creel according to the invention is put into operation. To do this, the roving spool creel is first loaded with empty roving spools, and the weight of the empty roving spools is recorded. The weight of these roving spools then represents a reference value for subsequent measurements of the amount of roving present in the roving spool dies.

With regard to an advantageous arrangement of the sensor units, various embodiments are possible in this respect.

In a first embodiment, the sensor units can be arranged, for example, in the area of the roving bobbin creel stringers. This means that, preferably, each roving bobbin creel stringer has its own sensor unit in the area of each machine section of the ring spinning machine. Such a design ensures both a very precise determination of the amount of roving remaining in the roving bobbin creel and, therefore, a very precise calculation of the remaining operating time of the yarn batch, and the ability to determine the weight distribution within the roving bobbin creel and thus prevent harmful one-sided loading of the roving bobbin creel in advance.

However, the design effort required to arrange the sensor units on each beam of a machine section of a ring spinning machine is not insignificant and can be significantly reduced if the sensor units are arranged in the area of the cross profiles of the roving bobbin creel. In such an embodiment, only two sensor units are advantageously required per cross profile, with one sensor unit each arranged on the rear side and one sensor unit on the front side of the cross profile. With a significantly simpler embodiment, the measurement results that can be achieved are somewhat less precise than the measurement results that can be achieved with the installation described above on all beam sections; however, the installation costs are also significantly lower.

Advantageously, the sensor units described above are each equipped with a strain gauge. Such strain gauges are often designed as foil strain gauges, which have a measuring grid foil with a resistance wire, which is applied to a thin plastic support and provided with electrical connections.

In addition, these foil strain gauges usually have another thin plastic foil on their upper surface, which is firmly adhered to a supporting part, in this case, to a stringer or to a cross-sectional profile of the roving coil creel, and mechanically protects the measuring grid.

These strain gauges can quickly and accurately detect changes in the shape of components, for example, due to loads. This means that deformations or compressions of the component in question that occur under load lead to a change in the specific resistance of the strain gauge, which can be relatively easily transmitted as an electrical signal to a computing system, which can then be used to determine the component's load. Shape changes caused by the weight of the roving spools on the stringers, cross sections, or spool suspension beams can therefore be recorded relatively accurately, and the current weight of the roving spools in the roving spool creel can be determined. Since the weight of the roving spools also represents the fill level of the roving spools in each case, the computing system can also relatively easily calculate the exact remaining operating time of the yarn batch.

In another alternative embodiment, a sensor unit is arranged in each case in the region of the vertical creel bars of the roving spool creel. The sensor unit preferably has a support component fixed stationarily to a creel bar and a measuring piece mounted so that it can be moved relative to the support piece. The support region of the roving spool creel with one of the cross-sectional profiles rests on the measuring piece. This means that the weight of the roving spool creel together with the roving spools suspended on the roving spool creel rests on the displaceably mounted measuring piece of the sensor unit, which is preferably designed as a pressure sensor.

By using such pressure sensors, which are arranged on the vertical creel bars of the roving coil creel, the cost of the required sensor unit can be further reduced, even if the accuracy of the measurement result is somewhat lower.

Various variants are possible not only with regard to the design and arrangement of the sensor units, but also with regard to the communication of the sensor units with the computing equipment.

The sensor units and/or sensor systems can, for example, be connected to the ring spinning machine's computing equipment using proven signal lines. However, the sensor units can also communicate with the ring spinning machine's computing equipment wirelessly, for example, via radio networks known as WLAN or Bluetooth.

In both cases, the values determined by the sensor units are guaranteed to be transmitted directly and reliably to the computing equipment, where they are processed to calculate the exact remaining operating time for the yarn batch in question.

The invention will now be explained in more detail by means of exemplary embodiments shown in the drawings.

It shows:

Fig. 1 shows a side view of a roving bobbin creel of a ring spinning machine, as known from the prior art,

Fig. 2 shows a schematic perspective front view of a first embodiment of a roving coil creel configured according to the invention, with sensor equipment in the area of the spars,

Fig. 3 a second embodiment of a roving coil creel according to the invention, with sensor equipment in the area of the cross profiles,

Fig. 4 an embodiment of a roving bobbin creel according to the prior art, with sensor equipment on the bobbin suspension beams for the roving bobbins,

Fig. 5 another alternative embodiment of a roving bobbin creel according to the invention, with sensor units in the area of the vertical creel bars,

Fig. 6 a strain gauge arranged in a sensor unit,

Fig. 7 a sensor unit arranged on a vertical creel bar of the roving coil creel,

Fig. 8 a sensor device arranged on a coil suspension beam according to the state of the art.

Figure 1 shows a side view of a roving bobbin creel 2 of a ring spinning machine 1, as known from the prior art. The ring spinning machine 1 is shown in this respect very schematically, i.e., of the ring spinning machine 1, only one of the so-called punches 13, which carries the lower rollers of the drafting systems of the ring spinning machine 1, as well as the central computing unit 7 of the textile machine, are shown in Figure 1.

As is known, such roving bobbin creels 2 generally have a plurality 3 of machine-length beams, which are supported by means of transverse profiles 8 on vertical creel bars 9, which in turn are mounted on the machine frame of the ring spinning machine 1.

The spars 3, which are usually designed as suspended rails, are usually part of a suspended rail system via which the ring spinning machine 1 is supplied with fresh roving bobbins 4. This means that suspended carriage trains run on the suspended rails 18, consisting of a large number of coupled bobbin suspension beams 5, which in turn are equipped with full roving bobbins 4, preferably roving frame bobbins, or, after the spinning process, with empty roving frame bobbins.

In the exemplary embodiment, the roving bobbin creel 2 each has two spars 3 per longitudinal side of the spinning frame, designed as downwardly open, O-shaped suspended rails 18, on which the coupled bobbin suspension beams 5 are guided by means of rollers 17 in a manner known per se. Such suspension car trains are usually driven by hand, by “locomotives” (not shown) or by friction roller drives.

Figure 2 shows a perspective front view of a machine section of a roving spool creel 2 of this type, which in practice is usually very long. As can be seen, and as already indicated above, such roving spool creels 2 essentially consist of stringers 3 designed as a suspended rail, cross sections 8, and vertical creel bars 9.

The stringers 3 are hereby fastened to the cross-sections 8, which in turn are supported on the vertical creel bars 9. This means that at least one cross-section 8 is in each case fastened at right angles to the vertical creel bars 9, which are embedded in the machine frame of the ring spinning machine 1 at intervals determined by the length of a machine section 12 of the ring spinning machine 1. In the exemplary embodiment, two stringers 3 are each screwed to the cross-sections 8 on each side of the machine, which, as already explained above, are preferably designed as suspended rails 18.

Furthermore, sensor units 6 are installed in each case in the area of the beams 3, which are communicatively connected to the computing device 7 of the ring spinning machine 1. As stated, the connection between the sensor units 6 and the computing device 7 is made, for example, via signal lines 11. However, it is also possible to connect the sensor devices 6 to the computing device 7 wirelessly.

The sensor units 6 are equipped with strain gauges 10, which detect the corresponding bending load of the stringer 3 as a function of the weight of the roving coils 4. As is known, said strain gauges 10, shown on a larger scale in Figure 6, make it possible to detect stretching and compressive deformations relatively easily. This means that said strain gauges 10 allow a relatively precise experimental determination of mechanical stresses and thus, for example, a good determination of the stresses on a support element caused by the weight it exerts.

In the calculation device 7, the load values detected by the sensor units 6 are processed, which, as indicated above, result from the weight of the roving bobbins 4 suspended on the stringers 3 via the bobbin suspension beams 5, i.e. the calculation device 7 calculates the remaining operating time of the corresponding yarn batch by means of the load values received from the sensor units 6.

Another advantageous embodiment of a roving spool creel 2 designed according to the invention is shown in Figure 3. In this embodiment, the sensor units 6 for determining the weight of the roving spools 4 are arranged in each case in the region of the transverse profiles 8.

That is, a sensor unit 6 is arranged in each case on the cross profiles 8 in front of and behind the fastening of the cross profiles 8 to the vertical creel bar 9. The sensor units 6 detect the bending stresses caused by the weight of the roving bobbins 4, which are positioned on the stringers 3 in a suspended manner on the bobbin suspension beams 5, which are inserted into the corresponding sections of the cross profiles 8. In this embodiment as well, the sensor units 6 are communicatively connected to the computer 7 of the ring spinning machine 1, where the connection can also be made in this case via signal lines 11 or wirelessly.

An embodiment of a prior art roving spool creel 2 is shown in Figure 4. In this embodiment, each of the numerous spool suspension beams 5 has its own sensor unit 6, which directly measures the weight of the suspended roving spool 4. That is to say, in this embodiment, as shown in Figure 8, each of the bobbin suspension beams 5, equipped with rollers 17 and moving on an O-shaped suspended rail 18, is equipped with its own sensor unit 6, which, when the bobbin suspension beam 5 is placed in its unwinding position in the area of a spinning site, is communicatively connected to the computing equipment 7 of the ring spinning machine 1. The connection is made in this respect, as shown, through a mechanical contact point 19 and a signal line 11 or, as already explained above in connection with the other embodiments, wirelessly.

In the present embodiment, the calculation device 7 also calculates, by means of the bobbin weights transmitted by the sensor units 6 of the bobbin suspension beams 5 during the spinning process and other constantly known parameters, the exact remaining operating time of the yarn batch in question.

Although the remaining operating times of the wick coils, which can be determined with such an embodiment, are very precise and very detailed, the construction effort required is relatively high.

Figure 5 shows another alternative embodiment of a creel 2 of roving coils according to the invention.

In this embodiment, a sensor unit 14 is installed in each case in the region of the vertical creel bars 9, which, as is known from the embodiments described above, is communicatively connected, either via signal lines 11 or wirelessly, to a computing device 7 of the ring spinning machine 1. As can be seen in FIG. 7, the sensor unit 14 consists of a support component 16, which is fixedly arranged on one of the vertical creel bars 9, and a measuring piece 15, which is mounted so as to be movable relative to this support component 16. The sensor unit 14, which functions as a pressure sensor, detects the contact pressure of the overlapping cross-profile 8, which in turn is loaded by the stringers 3, which absorb the weight of the roving bobbins 4, which are placed on the stringers 3 in a suspended manner on the bobbin suspension beams 5 in the area of a machine section 12.

The sensor unit 14 communicates the displacement of the measuring piece 15 relative to the support component 16, caused by the weight of the feed bobbins 5 of a machine section 12, to the computing equipment 7, which from there, as well as by means of other known parameters, constantly determines in an exact manner the remaining operating time of the batch of yarn in question.

List of references

1 Ring spinning machine

2 Fillet of wick coils

3 Crossbar

4 Wick coils

5 Coil suspension beam

6 Sensor unit

7 Calculation equipment

8 Cross-sectional profile

9 Fillet bar

10 Strain gauges

11 Signal line

12 Machine section

13 Punch

14 Sensor unit

15 Measuring piece

16 Support component

17 Roller

18 Suspended Lane

19 Point of Contact

Claims (1)

Roving bobbin creel (2) for a ring spinning machine (1) with at least two creel rows formed by spars (3), which can be equipped with roving bobbins (4), the spars (3) being supported on vertical creel bars (9) via cross profiles (8), the roving bobbin creel (2) being equipped with sensor units (6, 14) which detect the amount of roving present on the creel rows by means of measurement and transmit it to a calculation device (7), which from this calculates the remaining operating time of the roving located on the roving bobbin creel (2), characterized because the sensor units (6) are arranged in the area of the stringers (3) of the roving bobbin creel (2), the sensor units (6) are equipped with strain gauges (10), which detect the bending load of the corresponding stringer (3) as a function of the weight of the roving bobbins (4), and each stringer (3) of the roving bobbin creel (2) is equipped with a separate sensor unit (6) in the area of each machine section (12) of the ring spinning machine (1) or because the sensor units (6) are installed in the area of the cross profiles (8) of the roving bobbin creel (2), one sensor unit (6) is arranged in each case on the cross profiles (8) in front of and behind the fastening of the cross profiles (8) to the vertical creel bar (9) and the sensor units (6) detect the bending stresses, which are introduced into the relevant sections of the cross-sections (8) due to the weight of the roving coils (4), or because the sensor units (14) are arranged in each case in the area of the vertical creel bars (9) of the roving spool creel (2), have a support component (16) stationarily fixed to a creel bar (9) and a measuring piece (15) mounted so as to be movable with respect to this support component (16) and detect the contact pressure of the superimposed cross profile (8), which in turn is loaded by the stringers (3), which receive the weight of the roving spools (4). Roving bobbin creel (2) according to claim 1, characterized in that the sensor units (6, 14) are connected in each case to the calculation equipment (7) of the ring spinning machine (1) through signal lines (11). Roving bobbin creel (2) according to claim 1, characterized in that the sensor units (6, 14) are each wirelessly connected to the calculation device (7) of the ring spinning machine (1).