EP2140049B1 - Drive device for the spindles of a ring spinning machine - Google Patents

Abstract

In order to ensure the synchronous operation of the tangential belt driving the spindles of a ring spinning machine in sections, the electric drive motors (3) of the tangential belts (2) are configured as synchronous motors. They are supplied via a common frequency converter or individual frequency converters (4). The supply frequency is transmitted to the individual frequency converters by means of the machine controller (6) in the form of the desired spindle rotational speed.

Description

Technical area

The invention relates to a drive device for the plurality of spindles of a ring spinning machine, each with sections of spindles sectionally driving tangential, each driven by an electric motor.

State of the art

In the DD 287 961 A5 and DD 287 962 A5 are drive devices for the working units of a spinning or twisting machine disclosed, which are driven in sections by a plurality of tangential belts. No statement is made about the type of drive motors. The problem of synchronous running of the tangential belts is not addressed.

The DE 34 41 230 discloses such a drive in which the sectional tangential belts are driven by induction motors. Asynchronous motors run in particular when they are not equally loaded, not synchronous. To achieve the same yarn quality on all spindles of a ring spinning machine, synchronous running of the tangential belts must therefore be ensured in all sections. This is achieved by the fact that the tangential belts of adjacent sections wrap around common deflection rollers which ensure this synchronous operation. A similar solution is in DE 37 01 873 A described.

In order to be able to wrap around these common deflection rollers, the respectively adjacent tangential belts must run in different planes. This requires correspondingly wider whorls of the spindles and, consequently, the larger, unusable spindle length and run of the tangential belts above or below the respective neck bearing of the spindles. This in turn has the tendency of the spindle axes and not centric run of the spindles to the spinning rings result.

From the DE 196 25 321 A1 a spinning machine is known in which per side of a tangential belt for driving the spindles is provided. In this case, sections are assigned drive motors, which can be assigned common frequency converter. Again, working with pulleys. The problem of synchronous running of the tangential belts is not addressed here either.

General description of the invention

The invention was therefore based on the object to achieve synchronous operation of the sectional tangential belts on a drive device of the type mentioned, without that they are guided over common pulleys and thus would have to run at different heights. It solves this problem with the features mentioned in the main claim.

By feeding the synchronous motors with matching frequency, synchronous operation of all sectional tangential belts is achieved without them having to be mechanically coupled with each other.

The matching frequency can be generated by providing a frequency converter common to all synchronous motors, which feeds all the synchronous motors. Alternatively, each of the synchronous motors can be equipped with an individual frequency converter. This has the advantage that it is not necessary to provide frequency inverters of different power levels, depending on the number of synchronous motors to be fed. All synchronous motors are associated with them in terms of performance and otherwise adapted frequency converter.

In this embodiment, it can be provided that one of the frequency converters controls the frequency of the other in a master / slave ratio.

In order to ensure in particular the start-up of the synchronous motors, a resolver can be provided which detects the angular position of the synchronous motors and forwards them to the frequency generator. So this can act on the synchronous motors during startup with phase-correct supply frequency or regulate at speed deviations to the desired speed.

Specific description of the invention

Fig. 1

die Draufsicht auf die Spindel-Antriebsvorrichtung einer Ringspinnmaschine;

Fig. 2

die Draufsicht auf eine anders ausgebildete Spindel-Antriebsvorrichtung;

Fig. 3

die Draufsicht auf eine weitere anders ausgebildete Spindel-Antriebsvorrichtung;

Fig. 4

die Draufsicht auf eine Umlenkstelle zweier Sektional-Tangentialriemen zu einer Antriebsscheibe oder zur Spindelreihe auf der anderen Seite der Ringspinnmaschine.

In the figures of the drawing embodiments of the invention are shown schematically. Show it

Fig. 1

the top view of the spindle drive device of a ring spinning machine;

Fig. 2

the top view of a differently shaped spindle drive device;

Fig. 3

the top view of another differently shaped spindle drive device;

Fig. 4

the top view of a deflection point of two sectional tangential to a drive pulley or spindle row on the other side of the ring spinning machine.

FIG. 1 gives the floor plan of a ring spinning machine 1 again, which has a plurality of spindles, not shown here on both sides, which are driven in sections by means of tangential 2. Each tangential belt drives a number of spindles on both sides of the machine and in turn is driven by an electric motor 3. These electric motors are designed as synchronous motors. Their supply current is generated by a frequency converter 4, which generates from the frequency of the network 5 via a direct current intermediate circuit alternating (rotating) current certain, preferably variable frequency. The control of this feed frequency takes place in the form of the spindle speed by the machine control 6 the frequency converter 4 via a Interface is specified. In particular, the run-up of the spindles during start-up and their speed reduction at the outlet is controlled by the machine control.

The supply frequency is passed through a feed line 7 to all motors 3. Due to the synchronous running of all electric motors 3, the tangential belts 2 and the spindles also run synchronously.

At one of the electric motors 3, a resolver 9 may be arranged, which decreases the rotational position of this motor and reports back to the frequency converter 4 via a signal line 10. This regulates the supply frequency in the event of a deviation from the setpoint speed in the sense of a reduction in the deviation.

Since the number of electric motors 3 to be fed by the frequency converter 4 can be very different depending on the spindle number of a ring spinning machine, frequency converters of different power levels must be provided. In the embodiment of the FIG. 2 Therefore, each of the electric motors is equipped with its own frequency converter 4 ₁ , 4 ₂ , 4 ₃ , 4 _x always the same power level. Each of these frequency converter is fed from the network 5 and receives the set speed from the machine controller 6 via a signal line 8 and generates the corresponding supply frequency.

Also in a further embodiment according to FIG. 3 the machine control 6 controls only one frequency converter 4 ₁ closest to the final frame of the ring spinning machine. This then performs as master on the control line 8, the frequency converter 4 ₂ , 4 ₃ , 4 _{x of} the other sections as slaves.

To safely drive the two spindles 11, 12 on both sides of the point at which a tangential belt 2 is led to one of the electric motors 3 into the interior of the machine frame, is in the DE 195 01 626 C1 a deflection roller pair provided which directs the tangential belt at a small distance between the two spindles to the electric motor. Such Umlenkwalzenpaare 13 are also arranged between each of the two spindles 11, 12, between which two tangential belts are passed to the other side of the ring spinning machine.

The pulleys of the roller pair 13 are perpendicular to the plane of the spindles adjustable to adjust the contact pressure of the tangential 2 to the spindles can.

The object of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

All information and features disclosed in the documents, in particular the spatial design shown in the drawings, are claimed to be essential to the invention, as far as they are new individually or in combination with respect to the prior art.

LIST OF REFERENCE NUMBERS

1

Ring spinning machine

2

tangential

3

electric motor

4

frequency converter

5

network

6

machine control

7

feeder

8th

control line

9

resolver

10

signal line

11, 12

spindles

13

deflection rollers

Claims (6)

1. Drive device for the plurality of spindles of a ring spinning machine, with tangential belts (2) driving areas of spindles in sections in each case, which can be driven by an electric motor (3) respectively, wherein the electric motors (3) are configured as three-phase motors and are supplied with feed current with coinciding frequency, characterised in that the tangential belts (2) are not coupled together mechanically and the three-phase motors (3) are designed as synchronous motors.
2. Drive device according to claim 1, characterised in that a common frequency converter (4) providing all of the synchronous motors with feed current of a specific frequency is provided, to which frequency converter the feed frequency to be output by it is predetermined by a machine controller (6).
3. Drive device according to claim 1, characterised in that an individual frequency converter (4₁, 4₂, 4₃, 4_x) is associated with each of the synchronous motors (3) and the machine controller (6) controls the output frequency of all these frequency converters by means of a control line (8).
4. Drive device according to claim 3, characterised in that the machine controller (6) controls the frequency converter (4₁) of one of the synchronous motors (3), which in a corresponding manner controls the frequency converters (4₂, 4₃, 4_x) of the other synchronous motors (3) by means of a master/slave relationship.
5. Drive device according to any one of the preceding claims, characterised in that at least one of the synchronous motors (3) is equipped with a resolver (9) for detecting its angle of rotation and its measured value is passed to the frequency converter (4).
6. Drive device according to claim 1, characterised in that a pair (13) of deflection rollers is arranged in each case between the deflection of a sectional tangential belt (2) from the spindle region to a drive disc of a synchronous motor (3) and between the diversions of two sectional tangential belts onto the opposing spindle row of the ring spinning machine, the mutual spacing of the deflection rollers of the pair of deflection rollers being as small as possible.

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