The rapier loom is a type of shuttleless loom, and is a general-purpose loom for weaving small and medium-sized batches and frequently changing colored fabrics. In the production process, the rapier loom is inserted at high speed, and the consumption of the rapier head and the rapier band accounts for more than half of the total material consumption of the rapier loom. Therefore, how to effectively avoid the wear of the sword head and the rapier band is very important for saving the production cost. Wear hazards The rapier head and rapier band are the key components of the rapier weaving machine to complete the weft insertion task. In the process of weft insertion of rapier loom, the weft yarn is always actively controlled by the sword head, which results in less mistakes in weft insertion and high reliability. Once the scabbard is worn, it will lead to failure of weft insertion. Even if it is serious, it will even cause a large number of yarn breaks and affect the quality of the fabric. ——kongfz The looms were run at 400 rpm for 20 hours per day. The head of the sword reciprocated 960,000 times per day. In the course of long-term operation, the sword head was inevitably worn. The most easily worn parts of the head are the head, wings and bottom. Every time the weft is inserted, the sword head must be rubbed by the warp yarns, the guide sword hooks, the walking sword boards and the guide rails when entering the sword and retreating the sword. When the blades of the sword head are severely worn out, they can easily cause the warp yarn to break off, and even cause the sword head to jump out of the shed without being controlled by the guiding sword hook, resulting in a large number of breakages. - Z9001 Cause of wear Production practices have found that most of the head damage is due to breakage damage caused by the impact of the weft insertion head and the weft insertion head. This situation is due to the fact that the transmission and the rapier band wear out for a long time to form a gap, causing the head of the rapier to misalign. For example, the GA749 type rapier weaving machine has a relatively wide gripping head and its skeleton is made of plastic, so most of the damage is sent to the weft insertion head. Most of the head fractures occur at the head of the sword and the part of the yarn. ——chenjw189 The wear of the rapier head of the rapier loom has a lot to do with the type of fabric, and the wear conditions of different types of sword heads are different, and the difference is large. Yarn number, coarse, high density fabric, sword head wear more serious, short service life. The service life of the Chemical Fiber product swordhead is shorter, because the head of the swordhead rubs on the chemical fiber warp to generate heat, causing static electricity, which causes a hard indurated material to form on the bottom of the swordhead, making it easy to hang up the warp. - Dashan River The slurry composition used in warp sizing also has a great influence on the degree of abrasion of the sword head. Different slurry components also have different effects on the wear of the head of the sword head. ——lchjia The technical structure of the rapier loom also has a certain relationship with the abrasion of the sword head, especially the higher the height of the rear beam, the greater the tension of the underlying warp yarn, the more severe the wear of the sword head. Because the tension of the lower warp yarn is large, when the shed is gradually closed, the lifting force of the supporting scalp head is correspondingly increased when the lower warp yarn is lifted, and the greater the squeezing friction force of the guide sword hook, the greater the wear of the sword head. - Z9001 The transmission between the rapier belt and the rapier wheel of the rapier loom is a special belt transmission: the rapier belt has a rectangular hole, and in the driving process, both the root portion and the rapier hole wall contact teeth are engaged. Drive, there is friction between the rapier belt and the sword surface contact friction; rapier belt on the sword wheel engagement angle is usually 120 ° ~ 180 °, in the case of equal pitch, pass sword, rapier There is no relative sliding between the belts, and the pitch circle speeds of the two are equal. When the sword wheel swings, it forms a reciprocating linear motion of the rapier band. Because the flexible composite tape has a certain rigidity, the rapier band needs to withstand a certain bending stress when it is bent. Therefore, an arc pressure plate is designed so that the rapier band closely moves on the surface of the sword wheel, but the use of the arc pressure plate makes the rapier band The latter part of its friction has greatly increased and thinned. ——kongfz Precaution The tightness of the rapier weft insertion movement and the warp yarn opening movement directly affect the wear of the sword head. If the warp opening time is too early, there will be less contact between the sending weft tip and the warp yarn, and there will be more contact with the warp yarn when the sword is removed. Therefore, the friction between the sword head and the warp yarn is more; similarly, the warp opening time lags behind and the retreat sword comes into contact with the warp yarn. It will be less, but there is more contact between the warp and the warp and the warp. Therefore, the friction between the head and warp will be more. ——chenjw189 When choosing the slurry composition used for warp sizing, chemical slurry should be used to reduce the abrasion of the slurry on the sword head, which can greatly extend the service life of the sword head. At the same time, further research on the plating technology of the swordhead and the enhancement of the abrasion resistance of the coating on the surface of the swordhead is of great significance for extending the life of the swordhead. ——lchjia In the technical structure of the loom, the height of the rear beam is small, and the wear on the sword head is small. However, it is worth noting that the proper elevation of the back beam is beneficial to improving the quality of the fabric. The clarity of the grain lines and the depth of the peaks and valleys of the grain are much better than those of the rear beam at 1000 mm. Therefore, a reasonable height of the back beam should be determined. When weaving dense fabrics, the height of the back beam is generally about 1040 mm so that weaving can proceed smoothly. - Z9001 The coating quality of the swordhead is of great importance for the use of the swordhead. When the sword head enters and exits the shed formed by the warp yarns, the warp yarn generates alternating compressive stress on the surface of the sword head, so that the plating layer is fatigued and worn and peeled off. The exfoliated debris becomes a hard abrasive grain, and abrasive wear is generated on the sword head under the action of the warp yarn. Over time, a difference in height is formed between the base body and the plating layer and a cutting edge occurs, which causes the warp yarn to cut off and stop. - mp1936 From the point of view of transmission wear between the rapier band and the sprocket wheel, technicians often take measures to change the trajectory of the rapier band of the rapier loom in order to improve the meshing wear between the rapier band and the sprocket wheel. The change of curvature and the degree of deflection directly affect the degree of fatigue damage of the rapier band. The more change points, the more serious the damage. The length of the rapier and rapier belt meshing of the rapier loom increases, and the average force of the rapier belt and the rapier wheel will decrease. This will help improve the service life of the rapier belt and the rapier wheel. Textile Polyester Monofilament Textile Polyester Monofilament,Polyester Monofilament Wire,Polyester Monofilament Thread,Polyester Monofilament Fiber JIANGSU ZJA NEW MATERIAL CO., LTD , https://www.zjafiber.com
For more content, please follow this site