The New Four Unit Pmission Roving Frame Has Completed The Major Reform Of Roving Frame.

China

Engineering Society Qin Zhenjun

This not only simplifies the pmission of the roving frame, but also improves the winding quality of the roving, and eliminates the details caused by the unsynchronized speed of the drafting winding line, which greatly improves the production efficiency and product quality of the downstream processes.

At present, the new four unit roving frame on the market has six characteristics, namely, motor drive separately, automatic winding tension monitoring level is high, four rollers double short aprons three zone drafting type, automatic doffing automation degree, roving tension sensor establishment, cleaning system improvement and so on.

Four unit pmission and constant tension.

The four unit drive is the first characteristic.

The four variable frequency motors of roving frame respectively drive the speed of drafting rollers, spindles, spindles and dragons, and can complete the drafting and winding forming of roving under the control of computer, instead of the mechanical pmission system such as cone wheel pmission and differential micro. The synchronous matching of the four major motion systems is realized, and the details caused by the roving machine switch are eliminated completely. The computer completes the winding of the roving accurately according to the speed of each motor by the roving process and the software of winding forming.

The new four unit pmission technology has eliminated the advantages of the roving switch car due to mechanical pmission and greatly improved roving quality.

Under the condition of high speed operation of modern weaving and knitting technology, the peak tension of weft insertion of air-jet loom knitting machine is very high. Due to the high peak value of yarn unwinding tension, the yarn strength requirement is high, not only the average strength must reach a certain level, but also the strength irregularity is low, the dispersion degree of the force distribution is small, and the strength of the yarn is weak.

After testing, the broken ends of air-jet looms due to the existence of strong weak ring of spinning yarn account for 61% of the breakage caused by details. Therefore, how to reduce the details of spinning process and equipment caused by spinning is the main topic of modern high speed textile production.

The four unit roving frame has a significant effect on reducing the breakage of looms caused by details.

The establishment of roving tension sensor is the second characteristic.

In addition to adopting the four unit pmission technology, the new roving frame also sets up a roving tension sensor. It keeps a certain tension value between the speed of the winding line and the speed of the front roller outlet line, and the winding speed is slightly larger than the speed of the lead line 1%. No matter the change of the relative humidity of the large yarn, middle yarn, small yarn or vehicle, the winding tension controlled by the computer remains constant and constant.

Constant winding density is another important feature of modern high technology roving frame.

The new automatic control and adjustment winding tension control system (CCD device) of tension sensor is applied in the new roving frame. In essence, it is an on-line automatic control of the roving tension of roving yarn in large, medium, small yarns and winding positions. The tension adjustment effect of the roving tension is very obvious. If the tension adjustment is applied on the basis of the four unit pmission technology, the tension difference of the roving frame will be more ideal than that of the CCD technology.

A software tension control system newly developed by Qingdao Seth universal company is introduced. Tension control adopts spinning system mathematical model program software. With the latest control theory, namely motor torque theory, the finer adjustment of roving tension is realized. Instead of CCD control technology, it overcomes the drawback of instability of domestic CCD control technology, ensures constant tension spinning of roving function, and improves product quality.

Three zone drafting and perfect cleaning system

The four rollers double short apron three zone drafting is the third characteristic of modern roving frame.

For example, Japanese FL16 and Tsing Ze 668 are all applications of four rollers double short aprons, also known as D drafting. Our new FA491.FA494 roving machine also adopts four rollers double short apron drafting. In fact, four rollers double aprons have three drafting areas, but the draft ratio between 1-2 rollers is only 1.05 times the correct area, the main draft area is between 2-3 rollers, the cotton collector is placed in the finishing area, and the main draft area does not put cotton collectors, so as to achieve the requirement of drafting unbundled and cluster without draft, so as to achieve the purpose of increasing evenness and reducing the yarn spinning Mao Yu.

Four the roller drafting finishing area makes the fibers in the main draft area drafting to play a role of cluster in the finishing area, and the roving floc strips will be narrowed by cluster, so that the width of the roving whiskers due to the roller jaws in the front of the spun yarn will be reduced, so that the area of the spinning triangular area of the front spinning jaws to the twisting points will be reduced, so that the hairiness of the spinning yarns is less.

Therefore, the role of four rollers three zone drafting can not only increase the draft ratio of roving, but also reduce the hairiness and improve the quality of spinning.

Now it seems that the draft form of the four roller Three Zone double short apron is better.

The perfection of cleaning system is the fourth characteristic of modern roving frame.

The establishment of the cleaning system for roving machine improves the automation level. It can remove the short pile and impurities from Lola, leather roller and leather ring in time, prevent the filament winding and other parts, and ensure that there is no yarn defect due to the accumulation of short linen and flying flowers.

In addition, the new roving machine has the ability to purify the environment and reduce the dust and fly quantity in the production area. With the continuous improvement of the roving machine speed, the cleaning work should be strengthened to ensure the stability of the product quality and reduce the labor intensity of the cleaning work.

The new roving machine is also equipped with a broken end suction and self stopping device. Under the front roller, a broken cotton suction device is installed, which can solve the double yarn and other yarn faults caused by the floating ends of the broken ends.

Most of the new roving frames at home and abroad are equipped with this technology system.

In addition, there is also a self sensing stop system with cotton suction. On the one hand, the broken ends can be sucked into the pipeline, and the machine can be stopped to be processed on the other hand.

When broken ends, the short linen and flower clothing that are sucked into the tail pipe are detected by sensors. When the detection limit exceeds the limit, the machine will be stopped immediately.

The upper and lower cleaning device and the broken end suction device of the new roving frame form a cleaning system to improve the quality of roving and the purification level of the production environment.

The track of the suction pipe is mounted on the guide bar frame or on the bracket which is erected from the floor separately, and the collected waste material passes through the cylindrical through box to enter the air flow of the flying receiving station and is connected with the central fan.

The combined cleaning system equipped with electronic automatic control system ensures that when the roving machine breaks off, the blower stops blowing to the machine and turns to the ceiling direction, and the broken ends fly by suction suction into the negative pressure pipe.

Therefore, the combined suction and suction mechanism will not damage or interfere with normal roving spinning.

Consistency of front and rear guide yarn and automatic doffing

The consistency of the yarn guide angle between the front and the rear roving is the fifth characteristic of the modern roving frame.

The yarn guide angle of the roving machine before and after the roving frame makes the bias and the number of the front and rear rows deviate. The modern roving machine has improved the height of the rear flyer, so that the rear guide yarn angle is in line with the output angle of the front roving (Figure 6b). The F15/F35 roving machine, the Tsing Ze 668 roughing machine, the Marshall FTN roving frame and the Lakshmi LFS roving frame have all improved.

The automatic doffing technology of roving frame is the sixth characteristic of modern roving frame.

The automatic doffing technology of roving frame is the key technology to improve automation level, increase productivity and reduce labor intensity, and realize the traditional spinning continuous and automatic production line.

There is a large gap between the developed countries and the less developed countries. There are 29 workers in the less developed countries (developing countries), 10 in the developed countries and 4 in the United States. This gap is inseparable from the degree of automation in spinning production.

The developed countries in the United States and other developed countries have fully automated pformation of ring spinning system, including the implementation of automatic yarn doffing, automatic pportation and automatic assembly technology.

Automation of roving works is particularly important for developed countries with high wages.

The technical characteristics of roving full automatic doffer is that when the roving machine spins a certain length, it will stop automatically. The Xialong bar will fall to the doffing position, the doffing automatically and the reinforcement of the Xialong bar will be reset after the replacement, and the roving will automatically join to form a new round of spinning. The doffing time will be 4~5 minutes, and the falling roving collection will be pported to the roving pport system to be pported, such as the 670 and 680 Rawemat roving frame of the Tsing Ze as the built in fully automatic doffing device and more advanced.

Automatic doffing technology creates conditions for roving unmanned operation.

The semi-automatic spinning technology of the roving machine is more mature, especially the new roving machine of four unit pmission. The semi automatic falling yarn is more convenient than the non automatic falling yarn.

There is no need to reconsider the reduction of tapered wheel belt.

Most of the new roving frames made in China are semi-automatic doffing. When the roving is wrapped to a certain length, the computer stops, the Xialong bars fall to the doffing position, the yarn is replaced manually, the Xialong bar rises the position of the head again, and the head restarts the spinning.

The roving full automatic doffer is usually used in conjunction with the thickness and thickness.

In addition, manual handling is eliminated by the thickness and thickness. On the one hand, the employment is reduced, and the quality of the semi finished roving is more important.