1. Due to the many loop forming systems of the circular knitting machine, high speed, high output, fast pattern change, good fabric quality, few processes, and strong product adaptability, it has developed rapidly. The circular knitting machine mainly weaves clothing and decorative fabrics, but also general industrial fabrics.

introduction With the improvement of people's living standards, their clothing becomes more and more colorful, and the requirements for printing and dyeing products are getting higher and higher: there are more varieties of patterns and good performance. China's printing and dyeing equipment has gradually developed from small-scale manual operations in the 1950s to small-scale jiggers and other small equipment in the 1960s, and single-power thyristor control cabinets with adjustable excitation voltage in the 1970s. In the late 1980s, it was developed into a sub-power thyristor control cabinet for adjusting the armature voltage. Although the synchronization performance of electrical equipment has been greatly improved, the DC motor and its control circuit are used in the printing and dyeing industry environment, and the corrosion is serious and the operation fails. The rate is very high, and this control mode requires the use of a lot of high-power transformers and a large number of speed regulating resistors, and the power loss is also large.

The use characteristics of the space cotton netting machine: Plane forming, evenly spreading the width of the cotton net and the thickness of the cotton layer, and then conveying to the next process after pressure. Differential speed compensation can be adjusted between the netting machines to reduce the drafting of the cotton net. The reciprocating steering can adjust the buffer force, the rotation is stable, and there is an anti-floating device, and the bottom and lifting adjustment are convenient.

After a long period of accumulation, the dyeing process has formed a relatively fixed process flow. However, with the different types of fabrics, dye types, and printing and dyeing requirements, the dyeing process is becoming more and more complex and refined. Simple manual processing is difficult to solve and low in efficiency. It can only rely solely on people's own experience. Dyeing vat is one of the main equipment for dyeing yarn and one of the main energy-consuming equipment. In today's situation of increasingly tight resources and increasingly fierce competition in the textile industry, reducing energy consumption means reducing enterprise production costs and increasing enterprise competitiveness. ; With the development of frequency conversion control technology, frequency conversion control of flow pressure difference has been widely used in the dyeing and finishing industry. The energy-saving transformation of dyeing vat with frequency conversion energy saving has also become the most effective way for dyeing and finishing industry to reduce the energy consumption cost of dyeing yarn and improve product competitiveness. Therefore, the application of AC frequency conversion speed control device on the dyeing vat is of great significance for reducing energy waste.

In the field of textile engineering, weaving and weaving are two completely different processes. Spinning is an early process of weaving. Twisting belongs to the later process of spinning. For spun yarns, twisting makes the fibers more tightly entangled, so that the yarn has certain physical and mechanical properties; for filaments, the purpose of twisting is to improve the processability of the weaving, and improve the anti-pilling and anti-pilling of textiles. Snaking and strong twist make the fabric unique. Twisting is the relative rotation of the two cross-sections of the yarn. At this time, the fibers originally parallel to the yarn axis in the yarn are inclined into a spiral. The amount of twisting of the yarn and the matching of the twist direction and twist of the yarn in the fabric have a greater impact on the appearance and performance of the product. The indexes of twisting properties are: the twisting degree, the twisting coefficient, and the twisting direction that indicates the twisting direction. The twist direction of the yarn has a great influence on the appearance and feel of the fabric. Using the twist direction of the warp and weft yarns to match the fabric weave can weave fabrics of different styles such as appearance and feel.