light industry

First, the foreword
Spinning machine frequency conversion transformation and application of the main advantage lies in can doffing of large, medium and small yarn tension change law of according to realize automatic stepless variable speed, optimizing the spinning conditions, to as much as possible to maintain the spinning tension stability. To further reduce end breakage, reduce hairiness, achieve high yield and quality, reduce energy consumption and reduces the labor intensity of the worker will play a positive role.

二、The characteristics of tension of the spinning machine
Spinning is the last one in spinning process, in spinning, yarn breakage is the key to affect product quality, yield and energy consumption. The essence of the yarn breakage is: the roller to guide hook yarn spinning yarn strength is less than the spinning section under tension occurs when broken, so to reduce yarn broken ends must stabilize spinning tension.
High-speed rotary spinning yarn winding forming gas ring, gas ring in the size of the fluctuations in different spinning stage influences the spinning tension is one of the factors affecting the number of broken. Change out a balloon tension control of doffing spinning tension changes steadily, is key to reduce breakage.
(1) spinning tension and spindle speed: spinning tension and spindle speed is parabola relationship, namely when the spindle speed increases, spinning tension with the increase and higher spindle speed, spinning tension increase more.

(2) a doffing spinning tension changes: at the initial spinning air traffic control, the spinning tension maximum is because the gas ring the long and winding diameter is too small. With the rise of the steel collar, the gas ring tension is smaller, but in the end of the tube before and after the completion of the gas ring convex maximum, the tension is the most unstable, resulting in the movement of the wire loop is not stable. After the pipe bottom is formed, the change of winding diameter plays an important role in the yarn tension. The position of the steel collar is larger when the position of the steel collar is up (small diameter). When the steel collar is located at the bottom (large diameter), the spinning tension is small, and the gas ring is convex. The yarn tension is the most stable stage of the yarn tension and the shape of the gas loop. The front of the large yarn is full of the convex shape of the gas ring than the straight, but the height of the yarn tension has a sharp rebound phenomenon, and the loss of the regulation of tension, tension is not stable. Each time the yarn is wound up and down, and the rise is slow, and the speed is fast. The measured by a tensiometer in steel collar plate by turning on the moment, peak tension mutation, when the balloon shape change is large, easy to cause breakages and twist transfer unevenness.
Three, investment and return
1, improve the role of output
Installation of Guangzhou Yi Chong Fei spinning machine of the electronic science and Technology Co., Ltd. is the production of ECF500T series inverter, in small yarn and yarn should reduce the rate of 5% ~ 8% to reduce the end breakage rate), in the yarn according to the condition to improve the 5% ~ 15% speed, and length of yarn accounted for 80% of the entire length of the spinning, is spinning the overall rate of increase of nearly 10%, can greatly improve the spindle of the effective operation time, improves the production efficiency of the spinning machine, yield also increases nearly 10%.

2, improve the quality of the role, to reduce the broken rate
Break analysis
Yarn breakage is the major hazards in spinning production: effect of spinning machine production, reduce production efficiency; increase the labor intensity of Scotch; easy to cause defects in fabric increased, causing greatly the quality fluctuation; added back to the flowers, silk, the material consumption of the machine, so that the breakage is now spinning of high yield, high quality, low consumption, large volumes arranged an obstacle to the development of production.
The influence of spindle speed. The spindle speed increases, then the yarn is broken. The spindle to the constant speed rotation (no conversion), the distribution of doffing breakage is: small yarn up, less O Saji, yarn minimum, the proportion is 5:3:2. By inverter, yarn breakage can be reduced by about 10 percentage points.
Doffing breaking rate decreased and because of breakage of reduce tenders will be able to save time to do cleaning work, reduce the many unexpected yarn faults, to ensure the quality of yarn.

3, saving raw materials and energy
For some there is a certain degree of difficulty of the varieties such as twist yarn, core spun yarn, ramie / cotton yarn and high-grade combed product, by shifting the choice the best production process, to maximize the yield per unit area and reduce the joints, back to spend less, roller waste is also a corresponding reduction, is to save the rework waste of raw materials.
The inverter control of the main motor can be the maximum potential of mining motor power, full use and improve the power factor, so as to achieve the purpose of saving electricity. Don't install active power frequency general spinning machine between 7.3-8.1 and frequencyconversion after active power reached 9.9 above, reduces the reactive current and the line loss is reduced, saving electric energy, and in equal output of electrical equipment to reduce.
Energy saving example: we take a series of data to analyze, the price of 5000 yuan of a 15kw inverter, the average life expectancy for 6 years, if after the warranty period average per unit cost of maintenance for 1200 yuan calculation, average every degrees of report according to 0.6 yuan calculation. Originally each 15KW motor running 1 hours by 8 yuan, 192 yuan a day. Using frequency converter, we measured the current to reduce 33.6%, because most of the reactive power, plant power meters for active power meter, according to the normal active power meter on 13.6%, and the remaining 20% save on high pressure. Take 13.6%, one day can save 26.11 yuan, 300 days of work a year, a car can save electricity 7833 yuan a year, do not consider other factors, light power can be recovered within eight months. Six years saving 46998 yuan, less cost and maintenance costs, six years to save 40798 yuan.

4, improve production efficiency
(1) due to the frequency conversion governor, itself has stepless speed regulation function, no need to replace the belt, change speed at any time, so as to improve production efficiency.
(2) the built-in simple PLC programmable control, can be set by the time and speed, can achieve more than the speed of automatic energy saving operation. If the machine needs to be repaired or shift and parking, can be stopped by a simple PLC button to pause the program.
(3) the application of frequency converter has a great influence on the spinning production. By greatly improving the spinning speed when the yarn spinning, in the end basically unchanged, to improve the yield of spinning machine. Many spinning mills in China have received significant results. Many textile mills in order to increase production can only be used to increase the number of spinning machine, increasing number of spindle implementation, we should change train of thought, through improving each ingot production efficiency, improve the yield of single spinning machine to achieve not better? This can not increase the equipment, do not increase the plant, do not increase the situation of workers, increase production, increase the competitiveness of enterprises.
5, to extend the life of the machine
Especially frequency conversion with soft start, soft stop function. Reduce the impact current of the motor start, reduce the impact on the power grid, reduce the large inertia of mechanical wear, greatly extend the life of the motor and mechanical bearings, etc..
6, reduce maintenance workload
Frequency converter can provide online monitoring of current, voltage, motor speed, feedback information, time, fault, etc., and with automatic constant pressure control, speed tracking start control, protect the motor, reduce maintenance workload.
Five, the end of the language
I company of carding, roving, spinning, air spinning, frequency conversion transformation (application) project has been used in a number of textile enterprises, the obvious energy saving effect, effectively reducing losses and reduce maintenance costs etc. advantages such as textile industry colleagues praise!