I. Introduction
With the advent of the new century, China has increased its annual production capacity of nearly 10 million spindles. Now it has more than 60 million spindles and more than 4 million spindles, and more than 100,000 textile and garments. The production company is the largest textile country in the world. In recent years, about 20,000 spinning machines, 5,000 roving machines, and 100,000 weaving machines have been produced each year, as well as corresponding supporting equipment. It can be seen that China is also a big producer of textile machinery. In the new century, China will have to develop from a large textile country to a textile power. Textile machinery, which is the basis of technical equipment for the textile industry, will show qualitative changes. From a large textile country to a textile machinery powerhouse, we will vigorously develop textile machinery products that are highly efficient, energy-efficient, environmentally friendly, and have a high level of automation technology. This is a relatively long-term process. Difficult tasks for achieving this ambitious goal. Raising the level of textile machinery automation technology is one of the most important key technologies.
With China's accession to the WTO, its economy has become more integrated into the international economy. European textile machinery manufacturers have been fully committed to the Asian market, including the Chinese market. China's textile machinery production is facing more fierce competition, which has brought new features to the development of textile machinery and textile machinery automation technology. For example, frequency conversion speed control technology, motion control technology, programmable control technology, and network technology have been promoted on textile machinery. application. Now mainly introduces the application characteristics of textile machinery to frequency conversion speed control technology.
Two triangular wave speed
1. In order to meet the requirements of yarn winding and forming without stacking lines and edge collapse, the spinning winding head is composed of a friction roller, a traversing device for a grooved cylinder, a bobbin chuck, etc., and the slot traversing device motor speed The triangle wave must be adjusted to mark the output rate of the inverter. This speed regulation is usually achieved by the wobble generator controlling the output frequency of the inverter.
2. Communication function
The inverter is connected to the open bus and has an RS485 communication port. When the number of frequency converters used in the field is large (for example, 10 or more) and the distance is far, the I/O interfaces of the inverter and the PLC are large, the number of wiring is large, the workload of installation and maintenance is large, and the cost is high, it is reasonable to adopt a fieldbus control system. Such as the large-scale polyester spinning post-processing combined machine, etc., adopt this scheme. To this end, the inverter must be connected to the open field bus to run, stop, frequency modulation and modify the number of functions; inverter frequency, current, voltage and other state signals and over-current, overclocking, undervoltage and other fault signals can To realize central monitoring, the network control of the inverter is mainly to connect multiple inverters to the host computer through the serial port, and realize the operation, operation, status monitoring and fault alarm of the inverter through the man-machine interface, which is a technological development trend.
Three parameters set L-19-Triangular wave lower limit frequency H-43-Triangular wave fall time:
L-18—Triangular wave upper limit frequency H-42—Triangular wave rise time;
L-20- skip frequency b-7-start speed-up time, refers to the time taken for the inverter to accelerate from 0 to upper limit frequency;
IV. Application Case
With the development of textile machinery, the requirements for the speed control performance of electric drives are getting higher and higher, and the application of frequency converter speed regulation is becoming more and more common. While meeting the technological requirements, it also saves energy and reduces energy consumption for enterprises. Adapt to the current environment of a conservation-minded society and improve the product competition of enterprises.
Zhejiang Xiaoshan Meibang Chemical Fiber Co., Ltd. applies our company's special textile type converter. The company's textile equipment is transformed. After technological transformation, the process controllability and product qualification rate have been significantly improved, and the production efficiency and energy use have been improved. High economic benefits.
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