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Application case of easy drive inverter M200 series in circular knitting machine

Application case of easy drive inverter M200 series in circular knitting machine

(Summary description)The knitting circular knitting machine has many loop-forming systems (called the number of yarn feeds in the enterprise, referred to as the number of lines), high speed, high output, fast pattern change, good fabric quality, few processes, and strong product adaptability, so it develops quickly.

Application case of easy drive inverter M200 series in circular knitting machine

(Summary description)The knitting circular knitting machine has many loop-forming systems (called the number of yarn feeds in the enterprise, referred to as the number of lines), high speed, high output, fast pattern change, good fabric quality, few processes, and strong product adaptability, so it develops quickly.

Information
1. Overview
 
The knitting circular knitting machine has many loop-forming systems (called the number of yarn feeds in the enterprise, referred to as the number of lines), high speed, high output, fast pattern change, good fabric quality, few processes, and strong product adaptability, so it develops quickly. According to the types of fabrics processed and produced (academicly called jobs, commonly called grey fabrics in factories), there are the following types:
 
1. Single jersey series circular knitting machine;
 
2. Double-sided knitting circular knitting machine.
 
2. Process requirements
 
·The circular knitting machine is to knit cotton yarn into a cylindrical cotton cloth, and the equipment often requires an emergency stop.
 
·A flexible jog operation function is required, and the smooth operation of the motor is required during the work process.
 
·High starting torque requirements.
 
· The working environment temperature is too high.
 
3.System composition
 
(1) The electrical control system is used to complete the setting of operating parameters, simple button operation, and fault automatic stop instructions.
 
1. The control panel is composed of a microcomputer and a highly integrated control circuit, with convenient parameter setting, reliable button operation and intuitive information display.
 
2. The frequency converter is an important part of the AC control system of the motor (motor), which can achieve the purpose of changing the motor speed by controlling the output frequency. The speed can be adjusted in a wide range, and the start, stop, and slow performance can be set by parameters, which can be fast, stable and avoid impact.
 
3. The wiring in the electrical control box is clear and orderly, and the entire box is inside the lower leg, which can effectively ventilate and prevent dust. The electrical wiring is in a hidden place, giving consideration to beauty and safety.
 
(2) The transmission mechanism is a stepless variable speed motor controlled by a frequency converter. The motor uses a V-belt or a timing belt (toothed belt) to drive the driving shaft gear, and at the same time transmits it to the large plate gear, thereby driving the needle cylinder to run with the knitting needles for knitting. The driving shaft extends to the large circular knitting machine, and drives the yarn feeding tray to convey the yarn according to the amount. The transmission mechanism is required to run smoothly without noise.

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Electrical system diagram

4. Advantages of M200 high-performance vector inverter system
 
M200 series inverter has large low-frequency torque and stable output, outputting 150% of rated torque at 0.5HZ.
 
·The smooth and soft start function of the inverter reduces the impact of the equipment on the power grid, and the superior protection function greatly improves the technology of the equipment and improves the quality of the product.
 
·Good heat dissipation design, fully meet the equipment long-term working in high temperature environment.
 
5.Technical requirements
 
The large-circle knitting industry has relatively simple requirements for the control function of the inverter. Generally, the terminal is connected to control the start and stop, and the frequency is given by analog or multi-speed. The large circular knitting machine has a heavier load when it is working, and requires fast inching or low-speed operation. Therefore, in terms of electromechanical drive control performance, the inverter is required to control the motor to produce a large low-frequency torque at low frequencies. Generally, in the application of large circular kinematics, the inverter runs in the speed sensorless vector control (also called open loop vector) mode to ensure the accuracy of the electromechanical steady speed and the low-frequency large torque output.
 
During the operation of the circular knitting machine, the motor must not be reversed or rotated, otherwise the needles of the needle bed will be bent or even broken. Some large circular knitting machines are connected to one-way bearings, which may not be considered. If the system's forward and reverse rotation completely depends on the motor's forward and reverse control, reasonable parameters need to be set. On the one hand, the reverse rotation function must be set, and on the other hand, the DC braking function is required. Also pay attention to not stalling, so as to avoid losses such as broken needles. This program adopts analog input to set frequency. The circuit is simple (omitted). The large circular knitting machine requires fast response when starting, low-frequency high torque output; smoother and softer when stopping to protect the needle bed. Therefore, the reasonable setting of the above table parameters is the guarantee to give full play to the performance of the circular knitting machine. The principle is to obtain the best low-frequency torque output capacity by adjusting the F1-13 parameters and reduce the vibration of the high-speed circular knitting machine. Through the start-stop control (F2 group) And the acceleration and deceleration time parameters (F1 group) to get the smoothness of frequency adjustment.
 
6.Use effect
 
The low-frequency jog output of the M200 series inverters is simpler and more direct, and can overcome the shortcomings of the lack of low-frequency torque of most inverters, which not only protects the motor equipment, but also brings obvious economic benefits.
 
·The smooth and soft start function of the inverter reduces the impact of the equipment on the power grid, and the superior protection function greatly improves the technology of the equipment and improves the quality of the product.
 
·Good heat dissipation design, fully meet the equipment long-term working in high temperature environment.
 
·PLC control increases the automation degree of equipment system control

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