The circular knitting machine, the scientific name of the circular knitting machine (or circular knitting machine), is the main equipment for knitting sweaters. In the process of fabric knitting, circular motion is adopted to knit patterns through needle selection. The ability to knit patterns can reach a higher level through certain needle selection methods. The biggest advantage of circular knitting machines is its high output, so it receives a lot of wool. Favored by shirt companies. The circular knitting machine is now widely used in the textile industry.
1. Process requirements: The knitting circular knitting machine requires that the motor cannot be reversed and rotated, otherwise the needles of the needle bed will be bent or even broken. Some equipment is not equipped with one-way bearings. The forward and reverse rotation of the system depends on the motor control, so it needs to be appropriate. Adopt DC braking function.
The system adopts multiple speeds;
Jog: 5~6Hz Jog operation;
Work: up to 80HZ, high-speed weaving operation, the set frequency is given by the analog quantity or the open-loop frequency of the inverter digitally;
Take-up: 20HZ, low-speed take-up operation, when the cloth is woven to a certain length, it needs to take up slowly at a low speed of about 20Hz.
The load is heavier when weaving, the jog/start must be fast, and the inverter is required to have a low frequency and large torque and a fast response speed. The inverter adopts vector control mode to improve the accuracy of motor speed stability and low-frequency torque output.
The role of EN600 on the circular knitting machine
1. With S-type acceleration and deceleration start and stop smoothly;
2. Magnetic flux vector control mode, low frequency and high torque, fast response speed;
3. Deceleration plus DC braking function, stable shutdown and braking;
4. The magnetic field straight function is adopted to avoid needle breakage caused by equipment reversal.
The control part of the knitting circular knitting machine adopts single-chip microcomputer or PLC+human-machine interface control, and the terminal controls the start and stop of the inverter, and the frequency is given by analog quantity or multi-frequency is given.
For multi-speed control, there are basically two control schemes. One is to use analog given frequency, whether it is jog or high-speed low-speed operation, the analog signal and running command are given by the control system; the other is to use inverter The built-in multi-segment frequency setting, the control system gives out the multi-segment frequency switching signal, the jog is provided by the inverter itself, and the high-speed weaving frequency is given by the analog or the inverter digitally.
Inverter parameter setting:
Debugging considerations
1. Adopt EN600 magnetic flux vector control mode, set the motor parameters according to the motor nameplate, and spin self-learning.
2. Avoid rotation. Some knitting circular knitting machines are equipped with one-way bearings, but some large circular knitting machines do not have one-way bearings on the machine. A slight reversal may damage the dial, so you must control the motor. It is necessary to set the stop DC braking parameters for the inverter to ensure that the motor shaft is completely braked when stopping.
Shenzhen Eneng Electric Technology Co., Ltd., a national high-tech enterprise with independent intellectual property rights, focuses on the research and development, production and sales of industrial automation products. The main products include inverters, servo controllers, PLCs, new energy systems, etc.
Established in 2004, Eneng Electric has passed ISO9001: 2008 quality management system certification, EU CE certification, and won the National Innovation Fund, Shenzhen Strategic Emerging Industry Fund, Product Innovation Award, Most Investment Value Award and other honors. Re-elected the title of "Top Ten Domestic Brands of Low-Voltage Inverters".
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