连杆曲线导引的织机开口机构设计  

Design of shedding mechanisms guided by coupler curves

作　　者：詹葵华[1] 朱家程 白伦[2] ZHAN Kuihua;ZHU Jiacheng;BAI Lun(School of Mechanical and Electrical Engineering,Soochow University,Suzhou 215137,China;College of Textile and Clothing Engineering,Soochow University,Suzhou 215137,China;School of Intelligent Manufacturing and Intelligent Transportation,Suzhou City University,Suzhou 215104,China)

机构地区：[1]苏州大学机电工程学院,江苏苏州215137 [2]苏州大学纺织与服装工程学院,江苏苏州215137 [3]苏州城市学院智能制造与智慧交通学院,江苏苏州215104

出　　处：《现代纺织技术》2024年第6期61-69,共9页Advanced Textile Technology

摘　　要：传统连杆开口机构难以使梭口保持停歇,无法适应高速、宽幅的现代新型织机的工艺要求。引入特殊连杆曲线导引的概念,利用带鲍尔点和带圆点连杆曲线能使从动件产生停歇的原理,设计了两种新型连杆开口机构。该机构由四连杆机构和综框导引组件组成,四连杆机构的曲柄、连杆、摇杆和机架杆杆长比分别为1∶2∶2∶2.76、1∶2∶2∶2.3,连杆点的位置角分别为62.49°、49.15°,其与摇杆相连的连接杆与连杆等长。综框运动规律显示:两种机构梭口满开时主轴的相对静止角分别为约150°,40°和200°;综框处于最高和最低位时速度和加速度均为0,表明综框运动平稳,无冲击。该机构突破了传统连杆开口机构的局限,为低成本新型织机的开发创造了条件。The loom shedding mechanism is designed to achieve the heald frame motion that includes three periods of opening,pause and closing.To ensure the easiest passage of weft carrier,the pause period is an important condition for most looms'shed-forming device.However,due to the lack of pause in heald frame motion,the traditional linkage shedding mechanisms have become difficult to adapt to the technological requirements for modern high-speed and wide-width looms,and cam shedding mechanisms are becoming more widely used.This study introduces the concept of special coupler curve guidance and applies the principle that coupler curves with Ball's point or circling-point can make the follower pause to improve the previous design approaches of shedding mechanism.Specifically,because the coupler curves with Ball's point or circling-point have long approximate straight-lines or circular arcs,they can enable the heald frame as a follower to perform linear reciprocating movement with dwells at the limit positions by reasonable design.In this paper,we proposed two novel linkage shedding mechanisms guided by the symmetric coupler curves with two Ball's points and two circling-points(hereafter called shedding mechanism I and shedding mechanism II).The symmetric coupler curve with two Ball's points was obtained by a graphical method based on the inverted inflexion circles,while the symmetric coupler curve with two circling-points where the radii of curvature are equal was obtained by the analytic method based on Euler-Savary's theory of curvature of point trajectory.In shedding mechanisms I and II,the length ratios of the crank,coupler,rocker and frame are 1∶2∶2∶2.76 and 1∶2∶2∶2.3,with the position-angles of the coupler-points of 62.49°and 49.15°,respectively,and the lengths of the rods connected to the rockers are equal to that of the couplers.Additionally,in shedding mechanism I,the coupler-point directly drives the heald frame,while in shedding mechanism II,the heald frame is driven by a composite component compose

关 键 词：织机 开口机构 四连杆机构 连杆曲线 梭口 

分 类 号：TS103.1[轻工技术与工程—纺织工程]