JP2004538379A - Motor control for draft mechanisms arranged on both sides of the ring spinning machine - Google Patents

Abstract

[Solution]
In order to further reduce the engineering costs associated with the controllable drive of both drafting mechanisms of the double-sided ring spinning machine, the main dynamic motor 10 'of one draft roller 4 on one side of the ring spinning machine. Is also used as a primary motor for at least one motor 10 of a corresponding draft roller 4 'on the other side of the ring spinning machine, and that both said draft rollers have at least one It is proposed that the two mechanical transmission mechanisms 11 are form-locked to one another.

Description

【Technical field】
[0001]
The present invention relates to a ring spinning machine with a drafting mechanism having on each side at least two bottom rollers each, wherein at least one of these rollers is driven by an electric motor at both ends, and In this case, one of these motors is a primary motor (master motor) and the other is a passive motor (slave motor). By driving the roller via a separate electric motor, the number of revolutions of the roller and thus between the roller and the roller provided before or after it in the roving running direction The draft ratio can be easily changed without having to change the replacement gear.
[Background Art]
[0002]
One active motor means here a motor whose speed is regulated or controlled to a predetermined value by a voltage or frequency supply of this motor, whereas a driven motor A typical motor is operated with the same supply voltage or supply frequency, without the rotational speed of this motor being under the control of a controller or a regulator. Usually, they are of the same type, and are therefore based on the fact that the driven motor operates at the same load and at the same speed as the main motor.
[0003]
The draft roller of a large length ring spinning machine is under the control of torsion under the action of a rotating torque to be transmitted to the top roller and especially to the draft apron, this torsion being: Depending on the torque to be transmitted, the feed roller, the middle roller and the front roller are different. As a result of the sliding guidance of the draft apron via the diversion mechanism of the draft apron, such as deflecting rails and stirrup-like tension members, the twist in the middle roller is usually clearly defined in the other draft rollers. Than, higher. As such, this twist only affects the release, or formation, of the different high twists of these draft rollers, so as to induce an incorrect draft during startup of the ring spinner and during gradual standstill. It is harmless just to exert.
[0004]
It has therefore already been proposed to connect the draft rollers at both ends to one another by the same draft transmission mechanism (DE-A 26 41 434). At least at the ends of these draft rollers, there is no difference in twist that must be or could be compensated for in changing the operating state of the ring spinning machine. The differences in the twist in the intermediate region of the draft rollers are reduced to such an extent that these differences do not adversely affect the draft rollers. The closed transmission coupling mechanism formed by these draft rollers and the draft transmission mechanism, however, the exchange of exchange gears for changing the degree of draft is performed identically in both draft transmission mechanisms of the draft mechanism. Need precautionary measures.
[0005]
It has therefore already been proposed to reduce the twist of the draft rollers by driving them at both ends. In this type of known ring spinning machine with long draft rollers (EP 654 550), one of the motors operates at a precise speed. It is configured as a typical motor. Thus, the number of revolutions of the draft roller is defined by this active motor, whereas the other driven motor is driven by the rotational torque of this motor, in particular for the purpose of reducing the rotational twist of the draft roller. It is intended to be specified. With this arrangement, the advantage is achieved that the draft ratio between the draft rollers driven by these separate motors can be changed very easily without changing gears by changing the supply frequency of these motors. Is done. Damage due to incorrect replacement of the replacement gear is here excluded.
[0006]
German Patent DE 29 11 379 also discloses a ring spinning machine, in which a draft mechanism roller is provided at each end with one electric motor. It is driven by a motor. Both of these electric motors have a controlled number of rotations of one of these motors, and one of these motors can accordingly be regarded as the primary motor without , Powered by the same frequency converter.
[Patent Document 1]
German Patent Publication No. 26 41 434 [Patent Document 2]
European Patent No. 654 550 [Patent Document 3]
German Patent No. 29 11 379 [Disclosure of the Invention]
[Problems to be solved by the invention]
[0007]
It is therefore an object of the present invention to further reduce the structural and technical costs associated with the drive of both draft mechanisms of a double-sided ring spinning machine, which maintain a preset draft ratio with sufficient accuracy. is there.
[Means for Solving the Problems]
[0008]
The present invention solves this problem by the features of the main claim.
【The invention's effect】
[0009]
The motor of one draft roller on one side of the ring spinning machine, or the active motor, is at the same time the active motor for at least one motor of the corresponding draft roller on the other side of the ring spinning machine. By the way, no additional frequency converter is required for driving the other draft roller. The drive motor of the corresponding draft roller on the other side of the ring spinning machine only has the task of supplying rotational torque to these draft rollers, whereas the primary motor is By means of the speed-accurate operation of this motor, and by means of a mechanical transmission, the speed-accurate and synchronous operation of the corresponding draft roller is ensured.
[0010]
Advantageously, it is proposed to operate the driven motor with a controlled main motor supply current, also controlled with respect to frequency and / or voltage.
[0011]
In many cases, it is sufficient, however, to configure the driven motor as an asynchronous motor and to supply a constant supply current. The frequency and voltage of this supply current are such that the motors are driven in order to obtain and maintain a predetermined number of revolutions of the motors and thus the draft ratio that is to be achieved. Also, at the highest, predetermined rotational speed of each draft roller, it must also be arranged to supply a sufficient rotational torque to these draft rollers. On the other hand, these motors must also be (flexible) such that they do not supply any undesirably high rotational torque to these draft rollers, even at a very slight predetermined rotational speed of the respective draft rollers. Must be configured.
[0012]
In the figures, an embodiment of the invention is shown schematically in a plan view of a draft mechanism on both sides of a ring spinning machine.
BEST MODE FOR CARRYING OUT THE INVENTION
[0013]
The ring spinning machine has drafting mechanisms 1 and 2 on both sides, from which only three bottom rollers 3, 4, and 5, or 3 ', 4', and 5 'are present. It is illustrated, and the top roller, the load arm, and the like are not illustrated. These rollers have a much larger length than the length shown, which is indicated by a break line.
[0014]
The front bottom rollers 5 and 5 ′ are in all embodiments driven at one end synchronously and in the opposite direction by an electric motor 7 via a common transmission 6.
[0015]
Middle bottom rollers 4 and 4 'are driven by separate motors. These middle bottom rollers must tow the bottom apron 8, from which only two bottom aprons, respectively, are shown at both ends of these rollers. These bottom aprons 8 are guided in a sliding manner at least via deflecting rails, not shown, and possibly further guide elements, and accordingly the middle bottom rollers 4, 4 ′ Require a particularly high drive torque as a price. This results in increased torsion as a result of the large length of these rollers and thus adversely affecting the drafting operation of the drafting mechanism. In order to reduce this twist, these middle bottom rollers 3 and 3 ′ are driven by an electric motor 10 via a reduction transmission 9 at both ends in the embodiment of FIGS. .
[0016]
The electric motors 10 of one spinning machine advantageously consist of the same construction.
As the speed of these electric motors is controlled, it is usually not necessary to use synchronous motors, but asynchronous motors are sufficient.
[0017]
The feed rollers 3, 3 'are driven by middle rollers 4, 4'. For this purpose, from the transmission mechanism 9, a toothed belt transmission mechanism 9 'is guided to the transmission mechanism 11, via which the transmission mechanism of the middle rollers 4, 4' on both sides of the ring spinning machine. 9 are connected in one piece, and thus synchronously. This transmission mechanism thus ensures synchronous operation of the middle roller 4 ', which is also not driven by one controlled motor. Similarly, the driving force of the feed rollers 3 and 3 'is derived from the transmission mechanism 11.
[0018]
Since the spacing of the shafts of the transmission mechanism 11 is invariable and the position of the rollers 3, 3 ', 4, 4' is variable, however, for correction for different staple lengths, the transmission mechanism is toothed. This is performed using the belt 9 'or the link shaft 11'. Tension rollers (not shown) are assigned to these toothed belts 9 ', and the change in distance can be compensated by these tension rollers. By changing the drive pulleys of the toothed belt, the draft ratio between the feed rollers 3, 3 'and the middle rollers 4, 4' can be similarly changed.
[0019]
The electric motors 7, 10 are each supplied with power via one frequency converter 12, 12 ′, to which a three-phase alternating current of a predetermined frequency is supplied from a circuit via a conductor 13. These frequency converters 12, 12 ′ are configured to supply the secondary side with a supply current, preferably a three-phase alternating current, of different frequency and possibly voltage. The frequency and voltage of these supply currents are supplied to the frequency converters 12, 12 'from the control device of the ring spinning frame via the conductors 14, 14'. Similarly to the motor 7 for driving the front bottom rollers 5, 5 ', one of the motors for driving the feed rollers 3, 3' and the middle rollers 4, 4 'is also provided with a rotational speed detector 15, Or 16 and the outputs of these speed detectors are likewise connected via conductors 17 or 18 to the frequency converters 12, 12 '.
[0020]
With the supply current of the frequency converter 12, the electric motor 7, which drives the front bottom rollers 5 and 5 ′ via the conductor 19, is activated. The supply current of the other frequency converter 12 ′ is supplied via a line circuit 20 to the electric motors 10, 10 ′ which drive the other bottom rollers 3, 3 ′, 4, 4 ′.
[0021]
During operation of the ring spinning machine, the frequency converter 12 has a predetermined rotational speed in order to obtain a predetermined draft ratio between the middle rollers 4, 4 'and the front rollers 5, 5'. , 12 'are provided beforehand via line 14 with what frequency and voltage supply current these frequency converters have to operate the motor 7, or 10, 10'. . The rotational speed detectors 15 and 16 of the motors 7 or 10 ′ are then connected to the frequency converters 12, 12 ′ via conductors 17 and 18, the actual rotational speeds of these motors, ie. And the peripheral speed of the rollers driven by these motors. If there is a difference between the predetermined speed and the actual speed, the frequency converters 12, 12 'change the frequency and voltage of the supply current to reduce this difference, and The device controls the speed of these motors, and thus controls the draft ratio.
[0022]
In connection with the motors 10, 10 'which drive the feed rollers 3, 3' and the middle bottom rollers 4, 4 ', only the speed of the motor 10' is controlled. Since the controlled supply current of this motor 10 'operates the other motor 10 as well, this motor 10' is the primary (master) motor and these motors 10 are driven (slave) motors. It is. Similarly, if the rotational speeds of these motors 10 cannot be considered as being in a controlled state, the two draft mechanisms are nevertheless connected via rollers or transmission coupling mechanisms 9, 9 ', 11, 11'. Synchronous operation of 1 and 2 or, in the embodiment of FIG. 2, the introduction of the same, reduced torsional rotational torque at the oppositely located ends of these rollers is assured. I have.
[0023]
The control of the motors 7 and 10 'or the mechanical connection of the motors 10 and 10' and the draft rollers via the transmission coupling 11 makes it possible to provide a rotational torque to these draft rollers at both ends. The introductory part is also particularly relevant when starting and accelerating a ring spinning machine, up to the operating speed, in which not only different resistance torques but also different inertia torques can be applied to these draft rollers. It is self-evident that there is.
[0024]
The embodiment of FIG. 2 differs from the embodiment of FIG. 1 only in that, similarly at the other end of the ring spinning machine, one transmission coupling mechanism 11 is arranged, which tends to cause a relatively strong twist. By means of this transmission coupling mechanism, the synchronous operation of the rollers is particularly long, in that the rollers of one drafting mechanism are supported by the rollers of the drafting mechanism located opposite and are entrained in rotation. In ring spinning machines, a further improvement is distinguished only by the fact that the twists of these rollers are balanced.
[0025]
The embodiment of FIG. 3 is distinguished from the embodiment of FIG. 2 by the fact that the middle rollers 4, 4 'are split approximately in the middle of the length of this middle roller. At the same time, on the one hand, it is avoided that the screw connection via the threads of these bottom roller parts is released in the torque direction corresponding to the introduced rotational torque. On the other hand, this also applies to any change of gear for changing drafts in the pre-draft zone, if a different change gear is accidentally used, since the transmission mechanism is "open", It also has the advantage that no damage can occur.
[0026]
In the case of a relatively short ring spinning machine, in which the twist of the draft roller remains relatively small, this is often the case at the other end of the ring spinning machine, as illustrated in FIG. The arrangement of the drive motor 10 is not required.
Also here, and furthermore, the drive motor 10 ′ is used as the primary motor in one of the drafting mechanisms 1 for the motor 10 in the drafting mechanism 2 located opposite. The motor 10 ′ is accordingly also provided here with a rotational speed detector 16, via which the motor 10 ′ drives the rotational speed of the motor 10 ′, and The number of revolutions of the motor 10 driven by the motor 10 'is controlled.
[Brief description of the drawings]
[0027]
FIG. 1 is a diagram of an advantageous embodiment of the present invention.
FIG. 2 is a diagram of yet another modified embodiment of the present invention.
FIG. 3 is a diagram of yet another modified embodiment of the present invention.
FIG. 4 is a diagram of yet another modified embodiment of the present invention.

Claims (6)

A double-sided ring spinning machine comprising a draft mechanism on each side, each having at least two bottom rollers, wherein:
At least one of the rollers is driven by a separate electric motor each time, and
In such a double-sided ring spinning machine in which one of these motors is a primary motor (master motor) and the other motor is a passive motor (slave motor),
The active motor (10 ') of one draft roller (4) on one side of the ring spinning machine is likewise at least one of the corresponding draft rollers (4') on the other side of the ring spinning machine. Being a dynamic motor for the motor (10); and
Between at least one of said draft rollers, at least one mechanical, shape-integrated transmission coupling mechanism (9, 9 ', 11, 11') is provided;
A double-sided ring spinning machine. The active motor (10 ') is coupled to a speed detector (16), the output of which detects the frequency converter (12') so as to control the speed of the motor. The double-sided ring spinning machine according to claim 1, wherein the double-sided ring spinning machine is configured to be able to be supplied to the ring spinning machine. Similarly, the passive motor (10) is also configured to be supplied via a variable frequency converter (12 ') with a frequency-controllable supply current of the primary motor (10'). The double-sided ring spinning machine according to claim 2, characterized in that: The double-sided ring spinning machine according to claim 1, wherein the transmission coupling mechanism (9, 9 ', 11, 11') is configured to be capable of changing a speed ratio. 2. The double-sided ring spinning machine according to claim 1, wherein the draft rollers (4, 4 ') are driven at both ends by motors (10, 10'). Transmission coupling mechanisms (9, 9 ', 11, 11') between the draft rollers (4, 4 '; 3, 3') are characterized in that they are provided at both ends of these draft rollers. The double-sided ring spinning machine according to claim 1.