Qingdao Haifu Machinery Co.,Ltd
Contact:Mr. Max Xue
In the era of rapid development of textile industry, loom is also constantly upgrading. From shuttle to shuttle, from Low-speed to high-speed, from simple mechanical transmission to mechatronics, the type of loom is also constantly new. The jet loom uses the inexpensive carrier weft--compressed air to attract weft, there is no direct grip on the weft, so the Air-jet loom has the advantages of high speed, good weaving quality, low machine material consumption, high automatization, high mechanical efficiency, small vibration, low noise, convenient maintenance and so on. In addition, the Air-jet loom uses the profiled Reed, which does not hinder the warp opening of the Loom, and reduces the breakage rate of the warp.
1 weft Insertion
Weft insertion is the key to the five major movements of loom, and it is also the basis of distinguishing different weaving types. According to the different ways of weft insertion, loom can be divided into shuttle and shuttle-free loom, and shuttle-free loom can be divided into jet, spray, rapier, projectile loom and so on. So, the jet weft is the main factor that distinguishes the Air-jet loom from other loom, jet-induced weft initial use of single nozzle, after the use of a single nozzle and pipe, the current Air-jet loom general use of the main auxiliary nozzle and profiled Reed to complete the weft insertion, weft insertion mechanism of continuous improvement, so that weaving machine to high-speed, efficient, high-quality, wide, High degree of automation in the direction of development.
The new type of weft-storage device and the yarn rack are propitious for high speed operation, the fixed main nozzle and the movable main nozzle are controlled by module block. The pressure and time of the two main nozzles can be adjusted independently and will not damage the weft. 3 Gas storage tanks control the main nozzle and auxiliary nozzle respectively, the pressure can be adjusted separately, and the gas consumption is reduced. The 28-hole auxiliary nozzle has a strong cluster effect on weft, and the center velocity is high, especially for fine yarn.
1.1 Gas Source
There are two ways of air source for Jet weft insertion, namely, gas supply and concentrated gas supply. Jet weft to the gas source and its parts requirements are: Provide the airflow to stabilize clean, containing less oil, air pressure, flow, temperature and humidity to stabilize, energy consumption, equipment acquisition, operation and maintenance costs to be low.
1.2 Main auxiliary Nozzle
The nozzle of the Air-jet loom adopts the main nozzle and auxiliary nozzle, the main nozzle is controlled by the solenoid valve, and the auxiliary nozzle is controlled by the mechanical valve. The main nozzle consists of two sprinkler heads, with mixed weft and free weft-feeding function, the main nozzle structure using "Tapered gas chamber + circular Nozzle" combined with the nozzle, to improve the speed of weft insertion and weft quality is very good.
Auxiliary nozzle along the profiled steel Reed Groove, spaced 50~70mm around, install an auxiliary nozzle, a total of 28 auxiliary nozzles, along the direction of the insertion of auxiliary nozzles to gradually reduce the distance between the first 20 is 5/group, a total of 4 groups, the spacing of 60~70mm, the latter 8 is only 4/group, a total of 2 groups, spacing of 50~60mm. The nozzle spacing from large to small is to complement the main nozzle weft flow energy, to ensure that the weft insertion can be quickly and accurately in place.
1.3 Weft Flying angle
The weft angle is the difference between the spindle angle and the spindle angle corresponding to the weft entering the spindle at the right side of the spindle. The larger the angle of the weft, the longer the weft will fly in the spindle, as far as possible to prolong the flying angle of weft, it is advantageous to reduce the speed of weft in the spindle, on the one hand, can reduce the tension of weft bearing, reduce the demand for weft single strength, on the other hand, can reduce the speed of the load-weft airflow, thus saving energy consumption.
The weft flying angle is related to the type of fabric, reed amplitude, opening time and speed of loom. When the speed is fast, the reed width and the weft are the strands, the flying angle should be enlarged.
1.4 Jet Pressure
Air-jet loom gas is mainly used for the main and auxiliary nozzles, so it is the key to make sure the reasonable nozzle gas pressure is to save gas and improve the quality of the fabric. The adjustment method is: First, the pressure of the main and auxiliary nozzle is adjusted to 0.6MPA, then reduce the main nozzle pressure, observe whether the arrival time of the weft is consistent with the original setting value, and whether there is a loose-weft defect cloth. The auxiliary nozzle pressure is then lowered to 0.5MPA, and then adjust the main nozzle pressure, so that the arrival time and the original setting value, and observe whether there is loose weft defect cloth. So repeated adjustments until the auxiliary nozzle pressure to a minimum, and the arrival time with the process, does not appear loose weft and other defects.
1.5 Profiled reeds
The method for preventing airflow from spreading by jet-induced weft is generally used as pipe piece or profiled reed. Anti-airflow diffusion effect is good, but the interference and friction of the warp are serious, the reed seat is not good for the high speed, so the new type of Air-jet loom is used to prevent the airflow from spreading. Profiled Reed Reed Blade Formation groove is very smooth, groove mouth of the height, width is 6mm or so, the size of the shuttle mouth full open is also very small, the steel reed weft is only 35mm, these are conducive to high-speed weaving machine operation.
2 dozen Weft
The jet loom uses the special-shaped reed with the air Guide groove, and the quality of the Reed has a great influence on the weaving machine running and weaving quality. Profiled reeds each reed Blade front has a forward raised notch, by a number of reeds by a certain gap into the shape, the front of the formation of a guide airflow groove, known as the reed Groove. Like ordinary reeds, profiled reeds have the function of determining the position of the warp and weaving the warp into the mouth. When the profiled Reed is hit, the weft is played at the bottom of the reed groove.
The upper protuberance structure of profiled steel Reed Groove is called Upper lip, and the lower protuberance structure is called lower lip. The height of the upper lip to the reed bottom is generally 51~57mm, depending on the height of the main nozzle. The dip angle of lower lip also has different specification, have 0°, 6°, 12°.
1 Delivery and coiling
The selection of the delivery and take-up mechanism of air-jet looms relates to the weaving quality of loom, especially the thin and dense road profile is a kind of defect which is difficult to be solved in all weaving defects, and is also one of the important indexes affecting the quality of fabric. The elimination of transverse defects is always the loom manufacturers want to solve the problem, and the delivery mechanism is the decision to produce the most important mechanism of weaving defects.
There are many factors that influence the weaving quality of air-jet loom, besides the hardware facilities mentioned above and the setting of process parameters, other aspects must be considered synthetically in order to weave the fabric that meets the quality requirements.
The warp tension is a necessary condition for opening and matter weft, and also an important factor for the appearance and intrinsic quality of the fabric. Tension is small, weaving when the resistance is large, warp and reed, comprehensive eye friction intensified, the opening of the warp twisted, the broken, the tension is too large, the warp arrangement of the free transverse motion, the fabric is not plump.
Opening time determines the size of the spindle when the weft is played, and the size of the spindle determines the amount of movement of the weaving mouth caused by warp tension at the moment of weaving, and the movement of the weaving mouth affects the quality of the fabric directly.
The rear girder is related to the warp length and the angle of the warp to the rear beam. When weaving the special fabric, the rear beam is centered and the back of the rear beam is shifted to enlarge the angle of the warp to the rear spar, so that the tension remains uniform and the fabric is flat and neat.
The stop-through frame is not only a warp-stop device, but also a part that determines the posterior position of the spindle. The length of the posterior part of the spindle is increased after the stopping of the frame. In the case of the height of the opening, the warp elongation is small, but the friction between the warp is increased, so it is advantageous to the warp with weaker strength, lower elongation and good sizing quality, and conversely, for the high strength, the dry warp, the stopping frame to move forward. The height and height of the stop-rack device should be adjusted accordingly, and the gap between the 1~2cm and the warp is required. Practical experience: The gap between the front border and the warp is 1cm (if the hairiness can be slightly larger), the rear frame slightly contact the warp, weaving the best effect.
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