Frequency converter enables stable control of roving frame
Many people have misunderstandings or understanding of “Inverter enables stable control of roving frames“. Next, let the editor take everyone together to share with friends and explore more about “ Frequency converter enables stable control of roving frame” knowledge…
Saite Global Machinery (Qingdao) Co., Ltd. has produced roving frames for more than 20 years. In 1986, the company digested and absorbed the technology of Japan’s Toyota FL16 and successfully developed the Chinese high-speed suspension roving frame. In 2001, the company successfully developed a four-motor computerized roving frame, becoming the first domestic manufacturer to produce computerized roving frames.
With the advancement of spinning equipment technology, the original roving frame driven by a single frequency converter can be changed to four frequency converters to drive its mechanical transmission unit respectively, forming an electrical centralized control, which can improve and update the control method of the roving frame sensitively and efficiently, making the mechanical The transmission system is greatly simplified to adapt to market demand.
Due to the special requirements of roving frame spinning, the roving frame works continuously all year round and needs to be started and jogged frequently, which easily causes roving details and directly affects product quality. Moreover, if any frequency converter that controls the four-frequency computerized roving frame fails, it will cause yarn rot and yarn ends, which requires the frequency converter used to have high reliability. At the same time, if the power supply is suddenly interrupted during the spinning process, if the four motors cannot be stopped under control, it will also cause the roving to start. It can be seen that the synchronization and reliability of each motor are crucial during the operation of the four-frequency computerized roving frame.
Frequency conversion control of roving frame
The roving frame produced by Saite Global has long been completed by using two frequency conversion and two servo control methods. However, this control method is relatively complex and costly. It is not competitive in the market and cannot effectively solve the problem of power supply. The phenomenon of roving starting when there is a sudden interruption. The advancement of frequency conversion technology has made it possible for the four-motor computerized roving frame to use four frequency converters to completely replace servo control. After a long period of demonstration and experiment, Saite Global selected the FC300 series frequency converter produced by Danfoss of Denmark.
With many years of experience and application knowledge in the industry, Danfoss Drives can provide reliable, user-friendly frequency converters to meet the needs of customers from different industries and fields. Its standardized module design has great flexibility and can be used in short periods of time. Implement required functions within time.
FC300 series frequency converters are widely used in the fabric industry, and have been particularly successfully used in imported European textile machines. This series of frequency converters adopts asynchronous servo control mode and has high control accuracy and reliability. Its use also greatly increases the stability, reliability and sensitivity of the entire machine operation, reducing the failure rate to a low level.
AutomationDrive represents the concept of operating any machine or production line over the entire operating range from standard to servo via a single or multiple frequency converters. Intelligent plug-and-play technology and unparalleled reliability make inverter operation easier.
The VLTFC300 series is an all-round inverter with reliable and accurate load processing functions. It can estimate the motor current generated by the actual load and compensate it to make the equipment run smoothly; it has a built-in intelligent logic controller, which can perform simple PLC function and data calculation function realize automatic control of the motor; it has an energy reserve function and can use the power generated by kinetic energy to control deceleration when a power outage occurs; the optional MCO305 control card is a comprehensive programmable leisure manipulator, which enables Frequency converters add even more functionality and sensitivity. Equipped with MCO305 leisure manipulator, VLT Automation Drive becomes an intelligent inverter, realizing various complex system applications with high-precision dynamic control, synchronous control (electronic axis), positioning and electronic cam control.
Design of control system
When the roving frame is driven from a single frequency conversion to a four-frequency conversion, some mechanical connections can be canceled and replaced by electrical transmission. The parts driven by the four frequency converters are rollers, spindle wings, bobbins (winding) and dragon ribs. The motor powers are approximately 3 kW, 5.5 kW, 11 kW and 0.75 kW respectively. Corresponding to the motor power and load conditions, the The power of the inverter is selected as 4 kW, 7.5 kW (the full load rate of the spindle wing may be above 90%, considering its starting and stopping status, the drive power of the inverter should be amplified), 11 kW, and the lifting motor is selected as 1.5 kW. Frequency converter.
In the actual operation process, the requirement for the roving frame is to ensure that the linear speed of the spinning yarn is constant and that it is formed according to standards. According to the above analysis of each drive unit, when using the front roller or spindle flyer as the main machine, the other one and the bobbin are needed to ensure that the linear speed is consistent with the main machine. In terms of the mechanical gear coefficient, these three transmission units need to have electronic gears. Than the synchronization function. In addition, the tracking of the main machine by the dragon rib driving part is reflected in the online speed following, but the position status is set according to the process molding requirements.
According to the above system description, the technical key point is that the three drive units except the dragon ribs ensure strict angular synchronization, speed synchronization and positional relationship of the dragon ribs based on the electronic gear ratio. According to its mechanical operating rules, the key point for multi-unit synchronous drive is toSynchronous following performance in jog, start, and stop states outside normal operating conditions and multi-unit synchronization function during power outage. In the main circuit connection, the main circuit of the bobbin is connected to the power grid, and the DC bus terminals of the bobbin inverter are connected to the DC terminals of several other frequency converters. A fuse can be connected in the middle to protect the inverter. In order to ensure synchronization performance, the spindle wing with a relatively stable load is used as the host machine. Its encoder signal (host position signal) is connected to the encoder port 2 of other drive parts through its encoder port 2. The encoder port of the slave machine is connected to the encoder port of its own motor. The encoder signal makes a speed closed loop, and then runs synchronously according to the host position signal on the second port of the encoder.
Better match with roving frame
At present, the inverters of domestic four-motor roving frames mainly adopt some general vector inverters, such as the ATV71 series produced by Schneider and the FR500 series produced by Mitsubishi. These universal vector frequency converters are designed to meet the needs of different industries. They are versatile and have many functions. However, because they are not tailor-made for the textile machinery industry, there are still some problems in the application of roving frames.
DANFOSS inverter adopts asynchronous servo control mode, which has no crawling phenomenon when starting, which can effectively prevent the detailed problems of roving when starting and stopping. Moreover, the synchronization of each motor adopts angular velocity synchronization, and the synchronization accuracy is high. The universal vector frequency converter adopts speed synchronization or position synchronization for synchronization. Compared with angular speed synchronization, the synchronization accuracy is poor. Especially when starting and stopping, there will be a large synchronization error, which affects the quality of the yarn.
DANFOSS inverter adopts a special power-off parking control method, using energy feedback without adding any energy storage device to ensure the synchronization of the four motors in sudden power outages and prevent spinning yarn from starting. Most of the frequency converters used on roving frames now use energy storage devices such as capacitors and batteries. The capacity of these energy storage devices will decrease with time, and then lose the function of synchronous parking after power failure.
Saite Global applied DANFOSS frequency converters to the control of four-motor computerized roving frames, and achieved very good results. Product quality has been significantly improved. The problem of four-motor computerized roving frames prone to roving details has been completely solved. Frequency converters Parameter adjustment is convenient, synchronization performance is good, failure rate is low, and power saving effect is obvious. Currently, Saite Global has applied for a national creation patent for this synchronous operation system (patent number: 200510045181.0). The four-motor computerized roving frame using the DANFOSS frequency conversion control system has been highly praised by customers. It has now become the main model of Saite Global and has been exported to India, Pakistan and other countries. (Saite Global Machinery (Qingdao) Co., Ltd. Liu Zengxi and Cui Guihua)
AAASDFWETGD
Through the above description of “The frequency converter enables stable control of the roving frame“, what do you think about “ What are your understanding and thoughts on “frequency converter enables stable control of roving frame“, or if you are interested in purchasing fabric, you are welcome to leave your comments below on the website!
Disclaimer:
Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights and interests, please contact us and we will change or delete it as soon as possible.
AA
