Structural Performance Optimization Design of Continuously Accelerating Electromagnetic Weft Insertion System

Abstract

This paper addresses the problem of low electromagnetic weft insertion acceleration performance of extra-large width automatic looms. Based on single-stage electromagnetic weft insertion and multi-stage intermittent electromagnetic weft insertion, a sectional combined continuous acceleration electromagnetic weft insertion design plan is proposed. First, a new type of weft gripper for electromagnetic weft insertion is designed on the basis of the traditional projectile, and a segmented combined structure optimization design is carried out on the 90 mm single-stage coil. Next, the electromagnetic weft insertion movement model is established to analyze the force and movement speed of the gripper during the movement. The amount of work done by the electromagnetic force of the combined coil determines the exit speed of the weft gripper. Finally, in order to find the best parameters of the combined coil structure to meet the requirements of the launch speed, the steady state and transient performance of the segmented combined continuous acceleration coil are analyzed using Maxwell simulation software. The launch performance of the combined coil with different axial lengths of 45 mm, 30 mm, and 15 mm is compared. The results show that the entire acceleration process is more stable and efficient when the combined coil length is 30 mm, the inner diameter is 18 mm, and the number of turns is 600.

Dynamic prediction model of segmented combined electromagnetic launch weft insertion for super-wide width industrial fabrics

“…The magnetic field intensity and magnetic flux density at the axis of a single multilayer tightly wound solenoid coil 19 can be expressed as:Where X represents the vector composed of positions of points on the weft inserter. Each element in X belongs to [x−L,x], x represents the position of the front end of the weft inserter (changes with the direction of movement), and L represents the length of the weft inserter.…”

“…The magnetic field intensity and magnetic flux density at the axis of a single multilayer tightly wound solenoid coil 19 can be expressed as:…”

“…However, the commonality of the above schemes is that, to facilitate the control of the coil power supply, the length of the acceleration coil and the weft inserter at each stage are designed to be consistent. A segmented combined electromagnetic launch weft insertion scheme is proposed to provide a more stable and larger electromagnetic force 19 which provides a specific solution for the super-wide width electromagnetic launch weft insertion.…”

“…31 A PLC control system is designed to control the electromagnetic weft insertion mechanism. 32 Combined the segmented combined electromagnetic launch weft insertion scheme, 19 we use STM32F103ZET6 as the controller to control the power on and off of the coils, construct the required gradient magnetic field, and realize the reciprocating electromagnetic launch weft insertion.…”

Insertion Performance Study of an Inductive Weft Insertion System for Wide Weaving Machines

“…Through experimental research on the projectile ejection speed under different parameters of the electromagnetic coil, they established an adaptive neural network model that accurately predicts the projectile speed. Xu [4,10] designed a multistage electromagnetic emission structure to increase the initial speed of the warp inserter and concluded that a warp inserter initial speed as high as 126 m/s is required to achieve a 12 m wide fabric. Compared to the mechanical shuttle insertion method, electromagnetic warp insertion provides a faster initial speed for warp insertion, allowing the yarn to travel a greater distance in the shuttle space.…”