Successful Development And Industrialization Of JWF1418A Fully Automatic Doffing Roving Machine

Guests: Zhang Jianguo, chairman of Tianjin Hongda Textile Machinery Co., Ltd.

The "JWF1418A" automatic doffing roving machine is a sub project of the "11th Five-Year" National Science and technology support project - "automatic rotor spinning machine and modern automatic continuous cotton spinning production line". It is a great encouragement and affirmation for us to win the first prize of 2011 "textile light" technology progress. Speaking of the achievements made by the company's self developed JWF1418A type automatic doffing roving machine, Zhang Jianguo, chairman of Tianjin Hongda Textile Machinery Co., Ltd. is pleased with his words.

With the rapid development of textile industry market The requirement of competition is more and more demanding for textile enterprises. The quality of yarn is also the same for weaving, printing and dyeing. The quality control of semi-finished products must be strengthened in spinning enterprises. In order to eliminate the quality problem of Narisa Sa and hairiness caused by human operation fundamentally, we must realize the automation of spinning workshop production, including the use of blowing carding, coarse and fine connection and fine connection technology, so as to form an automatic spinning production line. This will not only reduce the number of workers in textile mills, but also effectively solve the quality control problems of semi-finished products. Among them, the automatic doffing technology of roving frame is one of the key technologies for textile mills to improve automation, productivity, labor intensity at the bottom, stabilize yarn quality and achieve continuous production of traditional spinning. Zhang Jianguo's brief introduction made reporters full of a strong desire to explore the automatic doffing technology of roving frames.

Technology tackling difficulties

Realizing intelligent control in an all round way

Moderator: as textile enterprises to improve the production capacity of automation crux What is the key point of the technology of automatic doffing roving machine? What are the technological innovations in the JWF1418A automatic doffing roving machine?

Zhang Jianguo: the difficulty of automatic doffing roving machine is mainly the form of collective automatic doffing of roving machine. Germany's Tsing Ze company 670 automatic doffing roving machine and Italy marzlee company FT1D automatic doffing roving machine technology has matured, its collective automatic doffing form has become a patented technology. The JWF1418A type automatic doffing roving machine developed by ourselves is developed to avoid the patent barrier of foreign technology. According to the characteristics of the roving frame, the technology of collective automatic doffing is developed, and the doffing form of automatic yarn filling and empty tube on both sides of the flyer frame is invented, and the national patent is obtained.

First, the JWF1418A type automatic doffing roving machine has abolished the traditional roving machines such as cone wheel speed shifting, forming, differential and so on. It adopts four motors to drive four parts of the roving drafting, the wing twisting, the bobbin winding and the dragline lifting. The intelligent variable ratio control, intelligent PID control and dynamic compensation are adopted. By using DSP technology, servo and frequency conversion speed control technology, the synchronous control and constant tension spinning of the four motors of the roving frame are realized through four mathematical models of motor speed, roving forming and constant tension. We adopt the built in automatic doffing system, and have invented the doffing form of automatically placing the yarn on the two sides of the flyer on the roving frame. The roving frame has been automatically completed from the doffing to the tube changing, the raw and the driving, and the automatic spinning of the roving frame has been realized. Through the unique "empty and full tube switching device" technology, the empty bobbins on the roving frame of full roving and coarse and fine conveying system are exchanged. thickness The combined conveying system realizes the automatic delivery of roving full empty pipes.

Second, JWF1418A type automatic doffing roving machine has realized the intelligent control of roving frame. The electrical control system has been controlled by ARM embedded system and DSP system. The man-machine interface has been realized through human-machine interface. The human-machine interface is based on windows CE platform, which is intuitive, clear and easy to operate. The human-machine interface password is classified according to process management, and multi-level password is entered to facilitate user management. Through the computer control technology and sensing technology, we have established an automatic monitoring system in the automatic spinning process, ensuring the safety and reliability of every link of the automatic doffing of roving frame.

The device has perfect functions of online fault diagnosis, inquiry and statistical analysis, and has the functions of on-line fault diagnosis and statistical analysis of the same day. Through the Internet, remote monitoring and fault remote diagnosis of equipment parameters can be realized. Through remote monitoring, technicians can monitor and control the running state and various parameters of production system and field equipment without visiting the scene. In addition, the roving frame has network function and can realize user network management. After roving is full of yarn, take the bow tie on the top of the tube yarn to make the roving winding, and prevent the roving sliver from falling off in transportation and storage.

Third, the JWF1418A type automatic doffing roving machine adopts the ingot bar type flyer, the flyer transmission and the bobbin transmission adopt the toothed belt drive, the spinning speed reaches the international highest level, the craft spindle speed reaches 1500 revolutions / points.

Moderator: in the development time of JWF1418 type automatic doffing roving machine over 5 years, what technical bottlenecks did your team encounter? How did the project break through these bottlenecks step by step?

Zhang Jianguo: in 2001, Tianjin Hongda developed the JWF1418 automatic doffing roving machine and made a prototype. As the JWF1418 type automatic doffing roving machine adopts the upper spindle flyer, when the yarn is filled and the vent pipe is emptied, the lower part of the bobbin tube should be held by the mechanical hand holding the yarn discharge tube. During the long-term use, the success rate of its action can not meet the requirements of the textile mill, and the reliability and stability of the full yarn should be further improved. How to improve the reliability and stability of the automatic doffing roving machine, which is filled with yarn and empty pipes, becomes the technical difficulty that we must solve. Through repeated analysis and demonstration, the designers believe that we can suspend the development of the automatic doffing roving machine with the upper spindle flyer, instead of the roving frame with the lower spindle flyer, and change the way to empty the full yarn, so that the reliability and stability of the full empty yarn can be guaranteed.

In January 2005, the product presided by Kong Ling Ling, aiming at the advanced level of the international spinning machinery, invented the "doffing form of automatically placing the yarn on the two sides of the flyer on the roving frame." To this end, we have developed a number of matching systems, and eventually developed a JWF1418A automatic doffing roving machine.

In the process of production, some technical difficulties have been found. For example, in the process of automatic doffing and empty tube exchange, there are individual steps without detection and protection, and easy to produce faults. Through technical improvement, we have improved the automatic monitoring system in the automatic spinning process, making all links of the automatic doffing safe and reliable. The JWF1418A type automatic doffing roving machine used the hoop method in the middle part of the roving yarn at full use after the full yarn was used in the initial stage. The roving sliver was easy to fall off in the full yarn transportation process, resulting in the waste of raw materials. Through technical research, the method of improving the roving winding and setting method of the roving machine full of yarn was improved, and the problem was solved well by using the bow tie on the top of the tube yarn. In January 2007, a prototype of the JWF1418A automatic doffing roving machine was tested in Anhui Huamao textile Limited by Share Ltd.

After nearly three years of operation and continuous improvement of Huamao textile Limited by Share Ltd in Anhui, the JWF1418A automatic doffing roving machine has met the design requirements and has met the needs of textile mills.

Remarkable application effect

Employment to reduce spinning quality

Moderator: so far, what is the industrialization and application of the project?

Zhang Jianguo: at present, the JWF1418A automatic doffing roving machine has set up two production lines in Anhui Huamao textile Limited by Share Ltd and Wuxi Jingwei Textile Science and technology test company, which has realized the automation, intelligence and continuous production of the roving frame, and has obviously improved production efficiency, labor productivity and reduced labor intensity. Among them, a JWF1418A type automatic doffing roving machine was connected with six spinning frames in Huamao company of Anhui. A JWF1418A type automatic doffing roving machine of Wuxi Jingwei Company is connected with three spinning frames (long cars), and realizes the connection of thickness and fineness.

In 2011, the company sold to Wenzhou Tiancheng and other companies a total of 30 JWF1418A type automatic doffing roving machine. At present, many enterprises have the intention to order JWF1418A type automatic doffing roving machine, the size is about about 300000 spindles.

Moderator: JWF1418A type automatic doffing roving machine as roving machine upgrading products, what practical problems have been solved for enterprises and what benefits have they brought?

Zhang Jianguo: with the rising labor costs and market competition of textile enterprises, textile enterprises are increasingly demanding to reduce the number of workers and improve the quality of spinning. The application of JWF1418A automatic doffing roving machine is an important step to solve the above problems. The JWF1418A type automatic doffing roving machine replaced the artificial doffing and raw head, reduced the workload of doffing work, reduced the labor intensity of workers, reduced the number of auxiliary workers, reduced the number of workers employed in 10000 spindles, thereby saving labor and reducing labor costs. Because the automatic doffing device is equipped, the roving machine automatically collectively doffing after full barrel, which realizes the automatic spinning of the roving frame, eliminates the damage to roving in artificial doffing and transportation, and improves roving quality.