CN-122013384-A - Constant stress winding forming method and winding equipment for flexible functional fiber

CN122013384ACN 122013384 ACN122013384 ACN 122013384ACN-122013384-A

Abstract

The invention discloses a flexible functional fiber constant stress winding forming method and winding equipment, wherein the constant stress winding forming method derives yarn target tension and yarn pretension required under the conditions of constant total stress and back pressure by constructing a mechanical model, and cooperatively and dynamically adjusts the rotating speeds of different motors according to the obtained yarn pretension, so that uniformity of cone yarn density distribution is remarkably improved, forming defects are effectively restrained, meanwhile, the back pressure is dynamically adjusted by utilizing an integral sliding mode control algorithm based on a space domain, feedforward equivalent control and nonlinear switching control are respectively calculated, the obtained back pressure is reversely solved, arm pressure required to be adjusted is obtained, and a rotating arm motor of yarn in the winding process is accurately controlled, so that the stress of each layer in the cone yarn is kept constant, and finally, the forming effects of uniform cone yarn integral density distribution and remarkably improved structural stability are realized.

Inventors

ZHANG XIN
WANG YUANHAO
WU KE
ZHANG HUA
FENG XIAOBIN

Assignees

浙江理工大学

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1.A constant stress winding forming method of flexible functional fibers is characterized by comprising the following steps: Setting yarn material parameters and process parameters, wherein the process parameters comprise target total stress, target back pressure and target package radius; On the basis of the winding layer stress of the current winding layer, introducing additional stress of all outer layers of the current winding layer to construct total stress of the current winding layer, and acquiring yarn target tension under the condition of constant total stress; Adjusting the winding speed, the linear speed of the overfeeding motor and the arm pressure corresponding to the current winding layer according to the yarn pretension of the current winding layer; And repeating the process until the winding radius of the current winding layer reaches the target winding radius.
2. The flexible functional fiber constant stress winding forming method of claim 1 is characterized in that the total stress comprises total radial stress and total tangential stress, the total radial stress is the sum of initial radial stress of a current winding layer and radial stress of all outer winding layers of a corresponding winding layer, and the total tangential stress is the sum of initial tangential stress of the current winding layer and tangential stress of all outer winding layers of the corresponding winding layer.
3. The method for winding and forming the flexible functional fiber under constant stress according to claim 2, wherein the initial radial stress is obtained based on the back pressure of the current winding layer and the thickness of the single-layer yarn, and the initial tangential stress is obtained based on the winding tangential tension of the current winding layer and the thickness of the single-layer yarn.
4. The method for forming the constant stress winding of the flexible functional fiber according to claim 3, wherein the winding tangential tension is the product of a winding angle cosine value and a yarn target tension.
5. The flexible functional fiber constant stress winding forming method of claim 1, wherein the arm pressure is adjusted according to the method that feedforward equivalent control and nonlinear switching control are added to obtain back pressure of a current winding layer, and reverse inverse solution is carried out according to an original stress formula of the back pressure to obtain the arm pressure to be adjusted.
6. The method for winding and forming the flexible functional fiber under constant stress according to claim 5, wherein the feedforward equivalent control is obtained according to the yarn pretension and the yarn target tension, and the nonlinear switching control is obtained according to the difference between the yarn measurement tension and the yarn target tension.
7. The method for forming the constant stress winding of the flexible functional fiber according to claim 1, wherein the method for obtaining the target tension of the yarn is as follows: the method comprises the steps of obtaining generalized radial stiffness according to material parameters of a bobbin, constructing a relation between winding layer stress and yarn target tension based on the generalized radial stiffness and winding layer radius, combining the relation between the winding layer stress and total stress to obtain a relation between the total stress and the yarn target tension, and obtaining the yarn target tension under the condition of constant total stress.
8. The method of claim 1, wherein the material parameters include inner radius of the tube, outer radius of the tube, gravity of the tube, relative elastic modulus and Poisson's ratio.
9. The method for constantly stressed winding flexible functional fibers of claim 8, wherein the radial elastic modulus of the bobbin is equal to the tangential elastic modulus of the bobbin, and the radial poisson ratio of the bobbin is equal to the tangential poisson ratio of the bobbin.
10. A flexible functional fiber constant stress winding device is characterized by being used for executing the flexible functional fiber constant stress winding forming method according to claim 1, and comprises a rotating arm (1), a magnetic ring (2), a yarn guide (6), a friction roller (7), a bobbin (8) and a driving module, wherein the magnetic ring (2) is used for twisting a plurality of yarns and then conveying the yarns to the yarn guide (6), the yarn guide (6) is used for adjusting the winding angle of the yarns on the bobbin (8), and the friction roller (7) is used for finishing winding of the yarns on the bobbin (8); The driving module comprises an overfeed motor (3), a traversing motor (5), a rotating arm motor and a winding motor, wherein the overfeed motor (3) is used for adjusting the yarn speed of a magnetic ring (2) conveyed to a yarn guide (6), the traversing motor (5) is used for adjusting the horizontal position of the yarn guide (6), the rotating arm motor is used for controlling the moment on the rotating arm (1), and the winding motor is used for controlling the winding speed of a bobbin (8).

Description

Constant stress winding forming method and winding equipment for flexible functional fiber Technical Field The invention belongs to the technical field of doubling procedures, and particularly relates to a constant-stress winding forming method and winding equipment for flexible functional fibers. Background The yarn is used as a key procedure for improving the strength and uniformity of the yarn in the textile industry, and a doubling winder is mainly relied on to ply a plurality of single yarns, and the forming quality of the yarn depends on the accurate control of technological parameters such as tension, winding angle, back pressure and the like. The existing implementation scheme most similar to the invention mainly comprises strategies such as constant tension winding, constant moment winding, taper tension winding, constant stress control and the like. While constant stress control attempts to optimize the shaping by eliminating the difference between the actual stress in the winding layer and the set pretension, and prior art has widely used algorithms such as PID, in-mold control or active disturbance rejection control to fine tune the yarn tension, these schemes typically focus on only a single variable control of yarn tension, long neglecting the dynamic adjustment of friction roller back pressure and its critical impact on winding density. Because the winding tension, the back pressure and the winding angle are not considered cooperatively, the traditional schemes still can lead to uneven stress distribution of 'inner tightness and outer looseness' in the cone yarn when facing the winding radius change, thereby causing the problems of insufficient structural stability, yarn loop slipping and the like. The main disadvantage of the prior art (mainly constant tension control strategy) is that it only focuses on the constant of the external winding tension, but ignores the cumulative effect of the internal stress in the cone yarn forming process, which leads to the extrusion of the outer layer yarn to the inner layer as the winding layer number increases, causing the cone yarn to present a non-uniform density distribution of 'inner tightness and outer looseness', thereby causing quality defects such as unstable structure, yarn loosening and even breakage. Disclosure of Invention The invention aims to provide a constant stress winding forming method and winding equipment for flexible functional fibers. In a first aspect, the invention provides a constant stress winding forming method of flexible functional fibers, which is characterized by comprising the following steps: Setting yarn material parameters and process parameters, wherein the process parameters comprise target total stress, target back pressure and target package radius; On the basis of the stress of the winding layer of the current winding layer, introducing additional stress of all outer layers of the current winding layer to construct the total stress of the current winding layer, thereby constructing the relation between the total stress and the target tension of the yarns, and acquiring the target tension of the yarns under the condition of constant total stress; Adjusting the winding speed, the linear speed of the overfeeding motor and the arm pressure corresponding to the current winding layer according to the yarn pretension of the current winding layer; And repeating the process until the winding radius of the current winding layer reaches the target winding radius. Preferably, the total stress comprises total radial stress and total tangential stress, the total radial stress is the sum of the initial radial stress of the current winding layer and the radial stress of all outer winding layers of the corresponding winding layer, and the total tangential stress is the sum of the initial tangential stress of the current winding layer and the tangential stress of all outer winding layers of the corresponding winding layer. Preferably, the initial radial stress is obtained based on the back pressure of the current winding layer and the thickness of the single-layer yarn, and the initial tangential stress is obtained based on the winding tangential tension of the current winding layer and the thickness of the single-layer yarn. Preferably, the winding tangential tension is the product of the cosine value of the winding angle and the target tension of the yarn. The arm pressure adjusting method is characterized by comprising the steps of adding feedforward equivalent control and nonlinear switching control to obtain the back pressure of a current winding layer, and reversely solving according to an original stress formula of the back pressure to obtain the arm pressure to be adjusted. Preferably, the feedforward equivalent control is obtained according to the yarn pretension and the yarn target tension, and the nonlinear switching control is obtained according to the difference between the yarn measurement tension and the yarn target t