Jet Weaving Machine Upgrading

From 2014 China The international textile machinery exhibition and ITMA Asia exhibition show that the domestic and foreign air jet looms are pursuing higher value-added products to meet the market demand of the transformation and upgrading of China's textile industry. With the weaving enterprises in Jiangsu and Zhejiang provinces, the development characteristics of the two provinces have also changed to the upgrading of quality in the past few years. The demand for weaving equipment, especially air-jet looms, is automatic, intelligent and high-speed energy-saving equipment that can meet the technological upgrading requirements of enterprises. 我們注意到這次展商推出的噴氣織機基本都具有相似的共性：一是織物適織性更廣闊，可涵蓋從化纖、棉、毛到玻纖等產業材料，能夠實現多噴、可自由選緯、改變緯密(最高8片綜框、電子多臂開口最多16片綜框)，不僅可織一般服裝、裝飾面料，而且還可織造超寬提花飾布、彈力布、折入邊等織物;二是織機設計模塊化即機構或裝置之間的互換性、通用性、高速化(車速都在1000~1500轉/分);三是自動化及智能化，如織造導航系統的應用;四是抗震性和優越的可靠性確保織機超高速化、寬幅化和低噪音;五是優化引緯系統設計，實現節氣降低能耗，緊扣當前節能環保的主旋律。 To sum up, the main and auxiliary nozzles, profiled reeds, aluminum heald frames, steel heald pieces, stopping pieces, weaving shafts, cloth rolls, warp shafts, side braces and so on, serve a lot of weaving equipment for air-jet looms. The specifications and models are numerous and complicated. The products should also follow the development trend of the main engine and carry out technological upgrading and upgrading. This is not only directly related to the efficiency and ability of the host production, but also plays a key role in the upgrading of the industry. How to achieve the reliability, consistency, interchangeability, precision and durability of these products with large consumption and easy consumption is an eternal topic that we have to solve.

Preferred basis Material Science

Realizing energy saving and noise reduction

Profiled reeds are the core of air-jet loom weaving, affecting the style, quality and appearance of fabrics. Their reliability, consistency and wear resistance play a key role in fabric quality, production efficiency and cost. However, the profiled reeds with excellent performance have a great relationship with the stainless steel material of the reed pieces. At present, the domestic production enterprises produce 301 12Cr17Ni7 materials, while the overseas manufacturers choose stainless steel strips according to the thickness of reeds and the conditions of profiled reeds. For less than 0.28 mm thick reeds, 301 materials should be selected, of which the content of Ni should be guaranteed not less than 7%; 430 (10Cr17) material should be selected for medium thickness reeds of more than 0.30 mm, while 420 (30Cr13) reeds are mainly used for manufacturing durable teeth of special shaped reeds and edge trumpets at weaving and special requirements.

Mechanism, reduce its friction coefficient, use magnetron sputtering technology to anticipate the transition layer of nanocrystalline Cr on the surface of profiled reed, then deposit the CrCN/DLC alloy coating with gradient thickness by multi arc ion plating co sputtering technology, and form the Cr/CrCN/DLC gradient abrasion resistant profiled reed coating to replace the expensive and unstable diamond-like carbon (DLC) coating. The profiled reed sheet made of nano ceramic alloy chemical composite coating has uniform coating thickness and can be increased or reduced according to the specific conditions of the fabric. It has high hardness, high strength and good ductility, enhances the abrasion resistance of the reeds, reduces the roughness of the surface of the product, reduces the roughness of the product surface, and prolongs the service life, and can replace the electroplating hard chromium process step by step. Actively exploring the wear of profiled reeds All two methods have been patented by national invention or utility model.

For the steel sheet heald and stopping piece produced by carbon steel, due to the process of electroplating, the environment is affected. It is recommended to restrict the production of carbon steel material, and its products should gradually withdraw from the market. The production material of steel sheet heald and stop piece should be the same as the special-shaped reeds, and 202, 430 and 420 series materials should be selected according to weaving objects and environment.

The reed beam of heald frame and profiled reeds is usually made of aluminum alloy. If necessary, the third generation aluminum lithium super alloy material or carbon fiber material can be jointly studied with the external related institutions, so as to realize the lightweight and high rigidity of the reed beam, so as to solve the high speed running stability of the loom and achieve the effect of noise reduction, durability and energy saving.

　 Recognize R & D difficulties

Raise the level of Technology

The technical improvement of the special-shaped reeds is mainly the development of the reed pieces. The popular throttle shaped profiled reeds now are produced according to the changes of the weft insertion system of the new looms of JAT810, ZAX9200 and Omniplus800. Compared with the ordinary shaped reeds, the shape of the reeds has changed, thus achieving the throttle effect. The special-shaped reed is characterized by the lowering of the peak height of the reed groove tooth, and the irregular reed is not easy to touch the warp when beating the weft, thereby reducing the broken ends. The elongation of the bottom of the reed groove makes the fillet alpha less than 1, which makes the sliding distance of the yarn loose in the groove, reducing the constant friction at a certain point, which is equivalent to increasing the weft line of the special reed and prolonging the service life. In addition, the auxiliary nozzles can move near the reed grooves to reduce airflow diffusion, and because of the improvement of the special-shaped reeds, the whole profiled reeds can be reduced a certain weight year by year, which has a certain effect on the energy saving and consumption reduction of looms. For the weaving of super wide width, heavy weight, carpets and other fabrics, the arch back impact resistant reeds can be used (as shown in the table, patent number: ZL 2012 1 0183746.1). The reed piece forms an arc structure at the center line of the weakest airflow trough, increasing the strength of the place, increasing the ability of the entire reed to resist impact, and reducing the thickness of the reed body, making full use of the assembly space, effectively preventing the warp wear and preventing the warp breaking, not only can save the raw materials, but also can greatly improve the loom efficiency, thereby achieving the purpose of enhancing abrasion resistance, overall stability and prolonging the service life. For glass fiber, carbon fiber and other filament fabrics, it is better to use the special profiled reeds with a single hump or straight teeth combination. The advantage is that the looms have clear openings, and avoid warping when the reeds are beating up, so that the auxiliary nozzles are elongated, which also can avoid air loss and reduce the weight of heteromorphic reeds, which is conducive to energy saving, high speed and high quality production of looms. The height of special shaped reeds for special fabrics and large beating force products can not be too high (reed length 80~94 mm). It is best to use the warp not to touch the reed beam to prevent fiber fuzzing and affect the quality of cloth. The shape and angle of the profiled reed slice are also very important. Generally, the upper edge of the reed groove is horizontal, and the lower edge is different from the horizontal angle because of the different type of the machine. The most commonly used is the 6 degree and 12 degree, but it is more reasonable to reduce the air diffusion from a =0 degree. In addition, the width of the reed slot is not necessarily 5.5 mm or 6 mm. It can be made wider according to the actual fabric condition and characteristics, such as 7~8 mm.

The key of the steel sheet heald is the consistency of the products. For this reason, the technical level of stamping, polishing and so on should be improved, such as one-time dry, wet and electrochemical polishing treatment, so that products can reduce deformation, improve accuracy and adapt to automatic wear. At the same time, it is best to use 0.25 millimeter thick material. The problem of stopping the loom is to reduce the wear and tear between the yarn and the synthetic eye and the slurry, reduce the number of stops and the number of heald frames, thereby reducing the energy consumption and providing guarantee for the high-speed operation of the loom. We can learn from the overseas "OP1F1L", "Jet", "Key" and other comprehensive processing methods, and develop a special functional comprehensive eye processing method suitable for our weaving habits, so as to meet the user's personalized needs. As we all know, in the jet weft insertion, the main nozzle's task is to ensure the weft yarn passes through the shed at a certain time within a certain time, while the auxiliary nozzle mainly makes the weft yarn run smoothly over the shed at the relatively small velocity. Due to the installation distance between the auxiliary nozzles on the reeds is about 70 millimeters, a large number of auxiliary nozzles on the surface of reeds work together. From the current series of auxiliary nozzles, there are also problems such as low export wind speed, fast speed attenuation, premature wear and tear of warp tension and material maladjustment. This makes the auxiliary nozzle increase in air consumption when it works, and becomes the "big gas user" in the operation of air-jet looms. At present, some scientific research units and enterprises have developed some personalized auxiliary nozzles, such as energy saving, grinding reducing and speed increasing auxiliary nozzles. If manufacturers can provide auxiliary nozzle with functional combination according to the comprehensive factors such as user type, fabric and reed width, the function of personalized auxiliary nozzle can be highlighted. Such as speed increasing and energy saving compound auxiliary nozzle, speed increasing and reducing grinding compound speed reducing grinding auxiliary nozzle, energy saving and grinding reducing compound energy saving and abrasion reducing auxiliary nozzle, and speed increasing, energy saving and reducing grinding three composite speed increasing, energy saving, grinding auxiliary spray nozzle and so on. In this way, the three functional auxiliary nozzles are combined to form four new types of auxiliary nozzles with complex properties.

　 Focus on autonomy innovate

Strive for original products

For a long time, the lack of independent innovation capability of weaving specialized enterprises is a common problem in the industry. The problem of independent intellectual property rights is not solved, and it does not block the plagiarism of product research and development. It can only be followed by others, which is very harmful and dangerous to the development of the whole industry. Enterprises feel the pressure of survival, at the same time, they must understand the importance of original technology. If there is no original product, enterprises will be eliminated by users and automatically withdraw from the stage of the industry.

In the critical period of transformation and upgrading of textile industry, there is still much room for the development of air-jet loom equipment to meet technological upgrading. Relevant enterprises should make full use of the new technology, new materials, new technology and new equipment to take into consideration the new thinking of developing weaving equipment. In addition to attaching importance to talents and respect for science, we should exert great efforts in product research and development and cost saving, and we can also carry out "machine substitution" in some large and large number of working processes, reduce labor costs, attach importance to improving the business skills and operation level of employees, make products exquisite, durable and customizable, meet users' individual requirements, and realize "private custom" service. If we do these jobs well, are there any problems in the social and economic benefits of the enterprises? I think the answer is beyond doubt.