Rapier looms are shuttleless looms.It is a general loom for weaving medium and small batch colored fabrics and frequently changing varieties.In the production process, the consumption of rapier loom high-speed filling insertion, rapier head and sword belt accounts for more than half of the total consumables of rapier loom.Therefore, how to effectively avoid the wear of the rapier head and sword belt is very important to save the production cost.

1. The harm of wear and tear
At 400 revolutions per minute and 20 hours per day, the rapier head moves 960, 000 times per day.The most vulnerable parts of the head to wear are the head, wings and bottom.The head of the sword will be subjected to the friction of warp, guide hook, sword plate and guide rail every time when entering the weft.When the two wings of the jian head are badly worn and form a blade shape, it is easy to break the warp yarn, and even make the jian head jump out of the shuttle without the control of the guide hook, resulting in a large number of broken ends.

2. Causes of wear
The wear of rapier loom head is also closely related to the type of weaving.Different varieties of sword head wear degree is different, the sword head wear serious, for coarse yarn and high warp fabric, its service life is short.
The service life of the chemical fiber products is shorter, because the jian tip heats up by friction on the chemical fiber warp yarn and generates static electricity, which makes the bottom of the jian tip condense a layer of hardened material and makes it easy to hang the warp yarn.The size composition of warp sizing also has a great influence on the wear degree of sword tip.
Different size components have different effects on the wear of sword tip.The process structure of rapier loom is also related to the wear of rapier head, especially the higher the height of back beam, the greater the tension of bottom warp, and the more serious the wear of rapier head.As the tension of the lower warp is larger, when the shed is gradually closed, the lifting of the upper warp of the lower warp increases the lifting force of the supporting tool head correspondingly, and the greater the extrusion friction of the guide hook, the greater the wear of the tool head.


3.How to prevent wear and tear?
The tightness of rapier weft insertion and warp opening time directly affects the wear of rapier head.When the warp is opened too early, the rapier head makes less contact with the warp when feeding, and more contact with the warp when the rapier head goes back, so more yarn is squeezed by friction between the rapier head and the warp.Similarly, when the opening time of the warp is delayed, there will be less contact between the blades and the warp, but more contact between the weft feeding blades and the warp, so there will be more friction and extrusion between the blades and the warp.Chemical grout should be selected to reduce the wear of the grout on the tool head and greatly prolong the service life of the tool head.At the same time, it is important to further study the coating technology of the rapier head and enhance the wear resistance of the coating on the surface of the rapier head to prolong the service life of the rapier head.

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