CN-122013435-A - Method for controlling weft yarn conveying speed of on-line creel of carbon fiber multi-axial warp knitting machine

CN122013435ACN 122013435 ACN122013435 ACN 122013435ACN-122013435-A

Abstract

The invention discloses a method for controlling weft yarn conveying speed of an online creel of a carbon fiber multi-axial warp knitting machine, and belongs to the technical field of carbon fiber multi-axial warp knitting. The carbon fiber multi-axial warp knitting machine comprises a main chain, a yarn extractor, a carbon fiber weft yarn shaft and an online creel, wherein the main chain is arranged on a main frame, the yarn extractor is used for pulling a carbon fiber weft yarn sheet, the online creel is used for bearing the carbon fiber weft yarn shaft, and the control method of the online creel weft yarn conveying speed is controlled by a formula (I). The output speed V3 of the weft yarn sheet, the advancing speed V2 of the weft yarn sheet pulled by the yarn taker and the moving speed V4 of the online creel are matched with each other, and the synthetic speed of the two speeds V2 and V4, namely the speed V3 of the weft yarn sheet, is kept constant in the whole production process, so that high-quality multi-axial carbon fiber cloth is produced. The method can well meet the use requirement of the multiaxial warp knitting machine in the production of the carbon fiber composite material, can ensure that the whole machine is well connected in operation and stable in operation, and ensures the high-quality laying of multiaxial cloth.

Inventors

ZHANG SIWEI
Sun lvzhou
ZHENG JIANGWEN
WANG DI
HONG WEI
TANG CHANGWEI
BIAN GANG
GUO ZHAOLAN
BI XUE

Assignees

江苏鹰游纺机有限公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (2)

1. A method for controlling the weft yarn conveying speed of an online creel of a carbon fiber multi-axial warp knitting machine is characterized by comprising a main chain (1) arranged on a main frame, a yarn taking device (2) for pulling a weft yarn sheet (3), a pressing device (4) for pressing the weft yarn sheet after the yarn taking device (2) pulls the weft yarn sheet (3) to a position, a yarn spreading device (5), a carbon fiber yarn shaft (6) and an online creel (7) for bearing the yarn spreading device (5) and the carbon fiber yarn shaft (6); the weft yarn conveying speed control method on the online creel (7) is as follows: ; (I) In formula (I): v3 is the output speed of the weft yarn sheet (3), which refers to the output speed of the weft yarn sheet (3) relative to the yarn spreading device (5); v1 is the backbone speed; L1 is the width of the weft yarn sheet (3); l2 is the stroke of the yarn taking device (2); a is the laying angle of the weft yarn sheet (3); v2 is the speed at which the pick-up pulls the weft yarn sheet to travel; V4 is the moving speed of the online creel, which means that the whole online creel comprises a yarn spreading device 5, a carbon fiber yarn shaft 6 and the moving speed of the online creel 7 carrying the yarn spreading device 5 and the carbon fiber yarn shaft 6, wherein the moving speed has two directions, and advances or retreats; V1, L2 and angle a are all set in advance according to the process requirements; V3, V2 and V4 cooperate with each other, and the resultant speed of the two speeds V2 and V4, i.e. the weft yarn sheet speed V3, remains constant throughout the production process, i.e. v3=v2+v4.
2. The method for controlling the weft yarn conveying speed of an on-line creel of a carbon fiber multi-axial warp knitting machine according to claim 1, wherein the laying angle a of the weft yarn sheet (3) is in the range of +45° to-45 °.

Description

Method for controlling weft yarn conveying speed of on-line creel of carbon fiber multi-axial warp knitting machine Technical Field The invention belongs to the technical field of carbon fiber multi-axial warp knitting, and particularly relates to a control method for weft yarn conveying speed of an online creel of a carbon fiber multi-axial warp knitting machine. Background In the production of composite materials, the multiaxial carbon fiber cloth is composed of a plurality of carbon fiber yarn layers which are arranged in parallel and straightened, and felt can be added, and then the carbon fiber yarn layers are bound together by a warp knitting structure. In the structure of the fabric, the multiaxial fabric fully utilizes the performance of parallel lines and improves the interlayer performance due to the existence of the multilayer layering and the binding yarns. Because the weft angle can be changed between +45 degrees and-45 degrees, the mechanical properties of the fabric such as stretching, tensile strength, impact resistance and the like are improved, and the process is simpler than that of the traditional carbon fiber reinforced composite material. The multiaxial carbon fiber cloth is widely applied to wind power blades, aerospace, automobile manufacturing, ship manufacturing, airplane parts, medicines, sports and leisure and the like. The production of the multiaxial carbon fiber cloth requires a multiaxial warp knitting machine, the weft yarn conveying speed of an online creel is an important parameter in the production of the multiaxial carbon fiber cloth, and if the weft yarn conveying speed of the online creel cannot be accurately calculated and controlled, the high-quality multiaxial carbon fiber cloth cannot be produced, and even the whole machine cannot operate. In the production of multiaxial carbon fiber cloth, carbon fiber tows must be expanded to a certain width through a yarn expanding device to meet the technological requirements of gram weights and the like, but the speed of the carbon fiber tows passing through the yarn expanding device, namely the speed of a weft yarn sheet, is very sensitive to the influence of the expanded width, the speed of the weft yarn sheet is slightly changed, the expanded width is different, the width of the weft yarn sheet deviates from a set value, the phenomenon of overlapping or gaps can occur on the cloth cover, and the multiaxial carbon fiber cloth is unqualified. Therefore, the control of the weft yarn conveying speed of the on-line creel of the carbon fiber multi-axial warp knitting machine is finished, and the high-quality multi-axial carbon fiber cloth can be produced. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a novel method for controlling the weft yarn conveying speed of an online creel of a carbon fiber multi-axial warp knitting machine, so that the weft yarn sheet speed is always kept constant, and the production of high-quality multi-axial carbon fiber cloth is ensured. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention relates to a method for controlling the weft yarn conveying speed of an online creel of a carbon fiber multi-axial warp knitting machine, which is characterized in that the carbon fiber multi-axial warp knitting machine comprises a main chain (1) arranged on a main frame, a yarn taking device (2) for pulling a weft yarn sheet (3), a pressing device (4) for pressing the weft yarn sheet after the weft yarn sheet (3) is pulled to a position by the yarn taking device (2), a yarn spreading device (5), a carbon fiber yarn shaft (6) and an online creel (7) for bearing the yarn spreading device (5) and the carbon fiber yarn shaft (6); the weft yarn conveying speed control method on the online creel (7) is as follows: (I) In formula (I): v3 is the output speed of the weft yarn sheet (3), which refers to the output speed of the weft yarn sheet (3) relative to the yarn spreading device (5); v1 is the backbone speed; L1 is the width of the weft yarn sheet (3); l2 is the stroke of the yarn taking device (2); a is the laying angle of the weft yarn sheet (3); v2 is the speed at which the pick-up pulls the weft yarn sheet to travel; V4 is the moving speed of the online creel, which means that the whole online creel comprises a yarn spreading device 5, a carbon fiber yarn shaft 6 and the moving speed of the online creel 7 carrying the yarn spreading device 5 and the carbon fiber yarn shaft 6, wherein the moving speed has two directions, and advances or retreats; v1, L2 and angle a are all set in advance according to the process requirements. The technical scheme of the control method for the weft yarn conveying speed of the carbon fiber multi-axial warp knitting machine on-line creel is that V3, V2 and V4 are matched with each other, and the synthetic speed of the V2 and V4, namely the weft yarn sheet speed V3, is kept constant in th