Application Of VFD In Double Twist Frames

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Double Twist Frames

In the field of textile engineering, spinning and weaving are two completely different processes. Spinning is the preliminary process of weaving. Twisting belongs to the post-spinning process. For short staple yarn, twisting makes the fibers intertwine more tightly, giving the yarn certain physical and mechanical properties.

As a type of twisting equipment, the double twist frame achieves one rotation and two twists, doubling the efficiency compared to traditional twisting machines, increasing the winding capacity, and significantly improving the quality of twisting.
The double twist frame mainly features:
High-quality spindles ensuring durable stability during high-speed operation.
Two-stage transmission mechanism for more reasonable force distribution and a wider range of twisting.
Oil-bath gearbox and special yarn-guiding curve ensuring good winding formation.
Winding tension adjustable on the overfeeding roller, making it suitable for winding relaxed and soft yarns used in dyeing.

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VFD Technology Principle

The double twisting machine belongs to the equipment of pre-weaving preparation process. As a type of twisting equipment, traditional double twisting machines only use one motor as power, which is distributed to each spindle, winding axis, and traverse rod through belt transmission mechanism and gear mechanism. When twisting yarns with different counts and strands, the spindle speed needs to be changed. Traditional double twisting machines accomplish this process by replacing the belt pulley, which is not only inefficient but also requires specialized maintenance workers.

With the continuous development of modern variable frequency drive (VFD) technology, infinite speed regulation of three-phase asynchronous motors has been achieved. It can adjust the motor speed according to the different processing requirements, satisfying the speed required by the processing technology. More importantly, under the drive of the variable frequency drive, as the power factor of the motor improves, the operating current decreases, thereby reducing equipment power consumption and saving operating costs.

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Advantages After Using VFDs In Double Twist Frame

The adoption of variable frequency drive (VFD) technology focuses on the convenience of achieving stepless speed regulation for ordinary three-phase asynchronous motors, while optimizing the motor power factor. With the change in speed, the operating current also changes, achieving energy-saving purposes.
After VFD retrofitting, the main advantages of the double twist frame are mainly reflected in the following aspects:

Excellent energy-saving effect:

Under VFD drive, as the motor power factor improves, the operating current decreases, thereby reducing equipment power consumption and saving operating costs.

Low starting current:

Reduces the capacity requirements of power supply equipment.

Convenient modification of process parameters:

When twisting different yarns, there is no need to replace the belt pulley. Instead, the speed can be directly adjusted through the VFD control panel to achieve stepless speed regulation, meet production process requirements, and improve yarn quality. The operation is convenient and quick, and can be completed by ordinary workers.

Smooth start:

By applying AC variable frequency technology, smooth starting can be achieved, and the equipment's startup acceleration time can be manually set, effectively eliminating the impact force during mechanical startup and extending the equipment's service life.

Motor protection function:

Reduces motor maintenance costs. The use of VFD control simplifies the control of electrical circuits. At the same time, VFD drives are designed with rich motor protection functions, effectively preventing motor burnout in cases of overcurrent, overload, and stall.

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