At present, the domestic sales of hanging roving frames can reach about 2,000 units per year. The three companies of Tianjin Hongda, Hebei Taihang and Jiangsu Hongyuan Company account for nearly 70% of the domestic market share. At the same time, the key technologies of the iron-free gun multi-motor transmission roving machine produced by Tianjin Hongda, Jiangsu Hongyuan, Hebei Taihang, Saite Global Machinery (Qingdao) and other companies have reached the international advanced level of similar products.
Four motor control breakthrough
The technical advancement of modern roving frames is mainly reflected in the use of four-motor control, which effectively eliminates roving details, achieves constant tension spinning, and simplifies mechanical transmission mechanisms.
The four-motor control roving machine replaces the mechanical drive system of the past cone-wheel shifting and differential micro-machines with an electronic computer-controlled transmission system. This transmission system uses four variable frequency motors to drive the four systems of the flyer, roller, spindle, and lifting, which realizes the synchronous matching of the four major motion systems and significantly improves the yarn quality. The JWF1418A roving frame developed by Tianjin Hongda Textile Machinery Co., Ltd. adopts the servo control system to realize the digital control of the equipment, and achieves the synchronous control requirements of four motors such as start, jog and stop, which effectively solves the problem of the details of the switch. At the same time, the machine also achieves constant tension spinning by precise control using a high-precision control system. Some new domestic roving frames also use tension sensors, which can automatically control and adjust the winding tension control system (CCD device), which can further reduce the tension difference between the front and rear rows of the roving equipment and the same row of ingots. For example, the roving frame with tension control system developed by Qingdao Scitech Global Textile Machinery Co., Ltd. realizes on-line fine adjustment of the roving tension, instead of the previous tension fine adjustment technology, making the roving tension more constant and more suitable for the spinning process. Fine-tune the roving winding tension change.
Constant winding density is another advantage of modern roving frames with four-unit drive technology. With this technology, a certain tension value can be maintained between the winding speed of the roving frame and the front roller take-up linear speed; at the same time, the device can also make the roving according to the change of the relative humidity of the large yarn, the medium yarn, the small yarn or the workshop. The winding tension of the device is always constant.
In addition, the four-motor roving machine also greatly reduces the mechanical transmission. Compared with the traditional mechanical drive roving frame, the four-motor roving machine not only reduces the energy consumption by 30%, but also greatly reduces the mechanical failure and improves the production efficiency of the equipment.
Automatic doffing technology is maturing
At present, the employment gap between developed and underdeveloped countries is very large. In the developed countries (developing countries), the number of workers per ton of yarn is generally 29, the average employment in developed countries is 10, and the number of workers in the United States is only 4, which is inseparable from the degree of automation of spinning production. The automatic doffing technology is divided into semi-automatic doffing and automatic doffing. From the perspective of reducing the labor intensity of workers and reducing the employment, automatic doffing equipment is the future development trend; however, given the actual situation of domestic employment in China, semi-automatic doffing equipment may still dominate for a period of time. At present, the semi-automatic doffing technology of domestic roving equipment has matured. The semi-automatic operation of the four-unit drive roving machine is much easier than the old-fashioned equipment, and it also saves the doffing time and reduces the labor intensity of the workers. Semi-automatic doffing, simply speaking, when the roving is wound to the set length, the computer issues an instruction to stop, manually take the yarn and replace it with the empty tube, and then the lower ribs rise to the position of the head, and the lap is started to re-spin. Generally, the entire doffing time takes about 3 minutes to 5 minutes, and the semi-automatic doffing device effectively solves the quality problem caused by the poor reset of the cone wheel in the past.
In addition to the semi-automatic doffing roving frame, the automatic doffer manufacturing technology of some domestic roving equipment manufacturers has been basically mature, and initially has the conditions for commercial operation. The characteristic of the automatic doffing technology is that when the roving machine is spun a certain length, it will automatically stop, and the equipment will automatically complete the tasks of doffing, roving automatic lapping, restarting to form a new round of spinning. The doffing time of this doffing technique is generally 4 minutes to 5 minutes, and the dropped rovings are concentrated to the roving transport system for shipment. The Zinser 670, 680 Rawemat roving machine automatic doffing device is built-in and the technology is more advanced. The maturity of the automatic doffing technology has created favorable conditions for the realization of roving unmanned operation and thick and thin equipment.
Thickness and thinness are worth looking forward to
At present, the technology of thick and small equipment manufacturing in many foreign countries has been relatively mature, and some enterprises in domestic enterprises have already begun research in this area. The system consisting of the built-in automatic doffing roving frame independently developed by Tianjin Hongda and the JWF9561 type thick and thin conveying system and JWF0121 tail yarn removing machine can realize the functions of automatic roving doffing, pipe changing, automatic conveying of roving and roving tube. The successful development of such equipment has cleared the technical obstacles for the production of the thin and small equipment. The TFA4461 automatic doffer and the THCXL01 roving conveyor of Hebei Taihang Machinery Industry Co., Ltd. also have automatic doffing and weight transfer automatic transmission. The THCXL01 roving conveyor solves the technical problem of the roving process from the yarn mill roving process to the spinning process. This thick and thin system is highly flexible, from simple transport systems to sophisticated multi-track systems. Scitech Global Machinery (Qingdao) FAD1802 roving conveying system makes full use of the customer's workshop space, cancels the yarn feeder and warehouse, avoids roving surface damage, improves the yield, and can be designed into automatic and manual according to customer requirements.
The stable operation of the thick and thin equipment requires mature roving automatic doffing technology and roving automatic yarn changing technology. The automatic doffing technology of the roving frame is the key technology to improve the automation of the equipment, increase the productivity of the textile enterprise, reduce the labor intensity, and realize the traditional spinning continuous and automatic production line. Relevant experts believe that the current automatic roving scheme for roving at home and abroad has been feasible, but the reliability of doffing needs to be further improved. The automatic yarn changing technology of the roving frame is the key technology to improve the automation degree, increase the productivity, reduce the labor intensity, realize the traditional spinning continuous and automatic production line, but at present, the success rate of the roving yarn changing section of some thick and thin equipment is not high, which leads to further implementation. It is difficult. There are also some experts who are not in favor of the current development of thick and thin equipment. They believe that the first is the complexity of the equipment. Now the technology is not mature and stable, and it is not suitable for development. Secondly, the price of such equipment Too expensive, basically no users in China can afford such expenses; moreover, textile companies now need to ease the current employment pressure, do not need to use such high-automatic equipment to reduce the number of operators; once again, there is no real meaning in China. An enterprise that can produce thick and thin equipment.
Although everyone's views on whether the current thick and thin equipments should be vigorously developed are not uniform, the "Equipment Manufacturing Industry Adjustment and Revitalization Plan" promulgated by the state this year points out that it is necessary to combine the implementation of the "Textile Industry Adjustment and Revitalization Plan" with a thicker and finer Joint, high-speed weaving equipment, non-woven complete sets of equipment, special weaving complete sets of equipment, high-efficiency, continuous, short-process dyeing and finishing equipment, etc., to promote the autonomy of textile machinery.
It can be seen that the development of the thin and thin equipment is still an irreversible development trend, which is worth waiting for.
(Editor: Global Hardware Network)
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