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Converter in the textile machinery in the application

Date:2010-08-07 20:14:12

1Introduction

In recent years, with the fierce market competition and the level of textile machinery Mechatronics continuous improvement of domestic and foreign textile era of universal access to frequency control drive. Frequency replace the traditional mechanical structure, from the Qing Hua, carding, as amended, and, roving, spinning, winding, warping, sizing, and other non-woven loom main processes and basic equipment has been widely used. Development of new textile machinery and almost without exception, the application of AC frequency control technology, which greatly improved the reliability of textile machinery and equipment to improve the quality and automation of textile.

2 Frequency of textile machinery in the

AC frequency control technology as the application of textile machinery in the inevitable trend, with the following obvious advantages:

(1) Reduce power consumption to reduce costs, have significant energy-saving effect。

(2) Variable speed induction motor can achieve。

(3) Simplify the mechanical structure, improve the speed and efficiency of production。

(4) Smooth start to eliminate the mechanical impact, improve the reliability of textile machinery and equipment.

3 Application of frequency control technology

3.1Classification of inverter driven features

Inverter motor control of textile machinery is mainly used three-phase induction AC induction motor.

(1)Using open-loop controlled induction motor drive speed as V / F form. The circuit is simple and reliable forms, but a small speed range, speed and low accuracy, and low performance is not satisfactory, so much less demanding for the knitting machine or the performance of textile machinery.

(2)Use of speed sensorless vector control inverter. The inverter has excellent low speed performance, simple circuit structure, high reliability, but also has good acceleration, torque characteristics and current limiting characteristics, to adapt to the governor and other printing and dyeing machinery.

(3)With velocity feedback with frequency vector control of induction motors, closed loop frequency control. Application of two-stage power insulated gate transistor (IGBT) power tubes instead of a regular (GTR), to improve the inverter switching frequency. Achieve high-frequency response, high accuracy, intelligence, performance requirements for high speed and constant tension, constant linear speed of the textile machinery.

3.2 Classification of textile applications drive

By the inverter is applied to the case of textile machinery, divided into three types:

(1) Choose a host for a frequency converter control a motor, such as spinning and the machine, etc. (1 trailer 1).

(2) Choose a host more than one motor inverter control, such as spinning machines, and yarn, etc. (1 trailer and more).

(3) A host of multiple choice multiple motor drive control, computer-controlled multi-motor coordination by the synchronization, to achieve the winding shaping functions, such as section warping machine (multi-multi.)

4 Frequency of technological progress brought about

4.1 Soft Start

When the motor is started directly by frequency, it will have 7 to 8 times the motor rated current. This will greatly increase the current value of the electric motor windings and heat stress, thereby reducing motor life. The frequency control voltage can be zero at zero speed start (of course, appropriate torque boost). Once established the relationship between frequency and voltage, the drive can be in accordance with the V / F or the vector control mode to drive the load to work. Reduce the frequency control to fully use the starting current, to improve affordability winding to reduce motor maintenance costs.

4.2 Stepless

Spinning process in turn requires stability of the electrical processing equipment, to move, start and landing speed should be smooth implementation of the draft in order to make the fibers evenly and reduce the weight of uneven value. In the rotating system of textile machinery and equipment, are borne by the belt and gear. Hardness of the reasons for starting the motor in jog and start the process, are bound to be belt slipping, gear impact and so on. In mechanical transmission, the gear is more, the greater the chance of damage gear. Application of AC variable frequency technology can be a good start to achieve smooth, eliminating the impact when the machine starts to realize stepless speed regulation, to meet the technological requirements of production, improve production efficiency and yarn quality and reduce operating costs. Application of this technology changes in the case of yarn varieties, without changing the pulleys, equipment and technology to change the speed setting can be completed simply by frequency.

4.3 Process Optimization

Frequency control to optimize the use of process, and can change quickly according to the process, but also through remote PLC or other controller to achieve the speed of change. As the acceleration control, as in the frequency control, the stop can be controlled manner, and can choose different ways to stop, so the whole system more stable.

5 Textile engineering application

AC variable speed used in textile machinery, we can say that almost all the mechanical processes have been applied. FA506 spinning frame, such as type, F1272 Comber, FA201B Carding Machine, in particular, F1520-type frame 1008, according to paragraph 10 of the spindle speed inverter control. An old cotton carding machine used in the design due to the technical conditions at the time, equipment, manufacturing costs, market demand and other factors, inevitably there are some shortcomings, such as the transmission of the electromagnetic clutch failure rate due , often caused by parking, fire from time to time, production efficiency and product quality to the loss suffered, and maintenance required to keep lots of manpower and resources. Electromagnetic clutch flywheel was abandoned, resulting in thin strips, serious side when broken, web pull off such phenomena, affecting the quality of sliver. To avoid this phenomenon, some of the operative method used to compensate for improper operation of equipment above the defect, but caused a large section of waste, greatly reducing the production efficiency. AC frequency control technology, has changed over these phenomena occur, as the transformation of the old machine provides a good example.

For the frame, since the use of the drive to remove the cam shape forming institutions, thereby overcoming the cam due to forming the end of a pause caused by the peach, peach top with the impact of such phenomena, making the spinning roll good shape for the next one high-speed unwinding process. While taking advantage of the drive control of the main spindle motor speed to control the speed, making the yarn spinning speed in the medium and small are changing in order to reduce yarn breakage rate, resulting in improved production efficiency.

6Conclusion

AC frequency control technology applications in the textile equipment is necessary, on the application of traditional textile equipment is feasible. Now engaged in the production of textile equipment in the AC frequency conversion technology is seldom used. Reasons: First, the textile industry in recent years, poor efficiency, inability to apply this new technology, the device configuration on the shape, spread the cost factor to give up the use of new technology equipment; the second is currently running seven or eight mostly textile equipment years on behalf of the production, but this new technology had yet to be applied; third is the lack of management and maintenance of power, not daring to use high technology equipment. As society advances, technology development and China's accession to WTO, China must increase the level of existing equipment, textile equipment, increase the technology content, increase of textile products in the international market competitiveness. Therefore, the AC frequency control of the high-tech equipment in the textile is widely used to promote the textile industry in industrial technology.

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