JPS60155729A - Fine spinning frame and yarn twister - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION In the well-known open-end spinning machine (DE-O32644749) mentioned in the preamble of claim (1), a spinning rotor (spinning rotor) is used.
rs) and unravellers are driven by mutually independent asynchronous motors.

The asynchronous motors for these two rotating bodies, which rotate at different speeds, are powered via one or more inverters in groups or groups over the entire length of the machine. and the inverter is frequency controlled.

The ratio of the output frequencies of these two types of inverters can be adjusted with respect to each other, so that the ratio of the output frequencies can be maintained when starting or stopping spinning.

In order to automatically restart spinning in a predetermined manner, control when stopping spinning is essential.

However, the description of this oven-end spinning machine does not mention measures for controlling spinning stoppage in the event of a power outage. Of course, power outages occur frequently in developing countries, but they must also be considered in industrialized countries. In spinning machines or yarn twisting machines with independently driven spindles or rotor spindles,
A power outage means that the slower peripheral rotating elements (unlabeler, drafting device or winding device) stop earlier than the spindle or rotor spindle. This can also lead to defects in the product (eg, severe unevenness in yarn twist) and even yarn breakage.

In traditional spinning or twisting machines, all elements are driven by one main motor. Synchronization between the spindle or rotor spindle and peripheral rotating elements has been achieved by a combination of frictional coupling, positive coupling and recoupling.

An object of the present invention is to ensure synchronization of peripheral rotating elements of a work unit in which motors are employed individually or in groups for driving a spinning machine or a yarn twisting machine during a power outage.

The above object is achieved by what is characterized in claim 11.
The design as 'adrant operaHon)' allows the asynchronous motor to act as a generator and to supply electrical energy back to the intermediate DC circuit when the speed is reduced after a power outage. If the inverters are electrically coupled via an intermediate DC circuit, the electrical energy is transferred from one drive train to another. Furthermore, the power outage control unit needs to be sufficiently buffered by the power storage unit. This controller registers a power outage and starts a spinning-off program (spinning-offpr).
ogramme) can be performed differently from the normal program of spinning stop. The relatively fast frequency drop in the inverter produces a generator-like braking effect on the asynchronous motor, resulting in the energy feedback described above.

The coupling of the intermediate DC circuit may be of a permanent type or of a type which is only applied during a power outage. If a permanent configuration is taken, an intermediate DC circuit can be coupled to the series-coupled rectifier of the inverter for each drive train.

In order to ensure that the feedbank energy does not exceed the maximum permissible intermediate circuit voltage, the process of the spinning-off program is carried out by automatic recording of the ratio of the intermediate circuit voltage to the output frequency, as characterized in claim (3). It can be determined by By doing so, damage to the elements due to overvoltage in the intermediate DC circuit or inverter can be prevented. This frequency reduction adjustment is also performed to determine its optimum value. This optimum value determines that the dynamic braking is applied as slowly as possible to keep deviations from normal spinning or doubling conditions as small as possible, and also provides a feedbank with sufficient energy to drive all peripheral rotating elements. It is determined that

Taking a ring type spinning machine as an example, the present invention is as follows.

In ring spinning machines, all rotating elements are usually driven by one central motor. The spinning spindle is driven by a Kunsential belt or drive shaft, and peripheral rotating elements such as bottom rafting rollers and ring rails are driven via a gearbox. Frictional or positive connections between all elements ensure synchronization of the operating sequence of the elements, not only when the speed of the central motor changes, but also during power outages.

From an energy saving perspective, ring frame spindles tend to be driven by independent motors. The asynchronous motor, which is frequency controlled via an inverter, makes it possible to select an energy-saving operating speed or to adapt the machine to intermediate speeds for starting and stopping spinning. The peripheral rotating elements are driven by one central motor that is supplied with power from an inverter. In this way, the ratio of the output frequencies of the two types of inverters can be adjusted with respect to each other, and at low speeds when starting or stopping spinning, the ratio of the output frequencies is maintained at the adjusted value by the corresponding control unit.

When a power outage occurs, the bottom rafting roller, which rotates at a low speed, has a small inertial energy, so the peripheral rotating elements stop early. On the other hand, 15,000 to 2
0. The spinning spindle, which rotates at a high speed of OOOrpm and has a large mass, slowly decelerates over a period of several minutes unless the brake is applied. The threads are then twisted one after the other, and in the process the quality of the threads deteriorates to an unacceptable level and eventually even breaks.

In order to avoid such a situation, the inverters are coupled through an intermediate DC circuit.

The asynchronous motor of the spinning spindle, which rotates with inertia, acts as a generator during power outages and supplies electrical energy back to the inverter and the intermediate DC circuit. To do this, the inverter is designed for multi-quadrant operation. That is, alternating current energy can be reconverted to direct current energy, and the controlled frequency reduction can provide regenerative braking of the asynchronous motor.

In the event of a power outage, the control of the inverter is sufficiently buffered via the power storage unit. Since the control unit has low energy consumption, this can be done with less failure and at lower cost by means of the power storage buffer.

The controller can register the power failure and automatically terminate the spinning process. Since the dynamic energy of the spinning spindle changes depending on the winding amount of the yarn, the spinning-off program does not also include adjustment of the regeneration brake of the spinning spindle according to the ratio of the intermediate DC circuit voltage to the output frequency. It won't happen. In this way, possible overvoltages in the intermediate DC circuit can be avoided.

In practice, spinning stops during a power outage faster than during a normal machine stop at intermediate speeds. However, by feeding back the electrical energy to the other drives of the machine, it is possible to synchronize the reduction in speed of all moving parts of the ring frame in a controlled manner.

The present invention will now be described in detail with reference to the block diagrams in the accompanying drawings.

For independent operation of the spindle or rotor spindle, the asynchronous motor 1 is supplied with current via an inverter 4 which receives direct current from a commutator bag W3. Similarly, current is supplied to the motor 2 of the peripheral rotating element group via an inverter 5 that receives direct current from a rectifier 3. In spinning machines with a large number of spindles or rotor spindles, further asynchronous motors 1 can be provided with inverters 4' connected in parallel.

By the control unit 6, the output voltage ratio of the two types of inverters 4, 5 is adjusted and maintained via the control line 8 when switching on and off the machine.

A power outage is registered in the control unit 6 via the detection line 9. During the power outage period, the control unit can execute the spinning-off program by receiving power from the power storage means 7.

In the course of a spinning-off program, the frequency of the inverter 4 decreases faster than the rotational speed of the spindle or rotor spindle. During speed reductions due to power failures, the asynchronous motor of the spindle or rotor spindle acts as a generator, so that electrical energy is returned to the inverter 4 and to the intermediate DC circuit designed for multiple four-way operation. Through line 10 this energy is transmitted to the other drive systems, thus maintaining the rotation of the motors 2 of the peripheral rotating elements and synchronizing the slowing down of all moving parts of the spindle or rotor spindle.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the invention. 1...Asynchronous motor 4.5...Inverter 6...Control unit 7...Power storage means patent Applicant Niss Ka F Kugellagerfabriken Gesellschaft Misotbeschlenkter
Haffrang Representative Patent Attorney Toru Fujioka

Claims (3)

[Claims] (1) It includes a spindle or rotor spindle that is independently driven by an asynchronous motor 1 that receives power supply through an inverter 4, and a peripheral rotating element group that receives power supply and drives through another inverter 5, In the case where the ratio of the output frequencies of the two adjustable inverters is adjustable and the nucleation is maintained by the control unit 6 even when starting and stopping the machine, the inverter 4 connected to the spindle or rotor spindle is a multiplex inverter. Set up as a four-drant operation, the inverters 4.5 of the separate drive system are coupled to each other via an intermediate DC circuit, and the control unit 6 is sufficiently buffered by the power storage means 7 in case of a power outage, registers a power outage, and is activated when the free speed decreases. A spinning machine or a yarn twisting machine, characterized in that the spinning machine or yarn twisting machine executes a spinning-off program that allows a frequency reduction in an inverter to be performed earlier than a reduction in rotational speed of a spindle or a rotor spindle. (2) The spinning machine or yarn twisting machine according to claim 11, characterized in that the inverters 4.5 are connected to a common intermediate DC circuit. (3) The spinning-off program is automatically adjusted according to the ratio of the output frequency and the voltage of the intermediate DC circuit.
The spinning machine or yarn twisting machine described in section 2).