CAJ | 학술논문

为了研究打结器割绳脱扣机构的运动规律，确定刀臂与卡线轮的时序节点，并研究现有凸轮内凹圆弧的设计依据，首先逆向得到盘形凸轮轮廓的曲线方程以及各部件的实体模型；然后根据工作状况对该机构进行运动学分析与计算，得到刀臂的角位移、角速度、角加速度曲线；最后仿真验证了运动学计算。研究表明：凸轮转角φ＝34．32°时角速度最大，在此邻近区间应滑切割绳，且开始割绳时卡线轮应停止转动；盘形凸轮内凹圆弧的设计方案可以使刀臂角速度比直接用线段的方案平均大18％左右，从而使刀臂割绳时有更大的角速度。
위료연구타결기할승탈구궤구적운동규률，학정도비여잡선륜적시서절점，병연구현유철륜내요원호적설계의거，수선역향득도반형철륜륜곽적곡선방정이급각부건적실체모형；연후근거공작상황대해궤구진행운동학분석여계산，득도도비적각위이、각속도、각가속도곡선；최후방진험증료운동학계산。연구표명：철륜전각φ＝34．32°시각속도최대，재차린근구간응활절할승，차개시할승시잡선륜응정지전동；반형철륜내요원호적설계방안가이사도비각속도비직접용선단적방안평균대18％좌우，종이사도비할승시유경대적각속도。
The intention of this paper is to study the motion laws and design basis of the D-knotter wiper mechanism, and research the movement node of the wiper and the twine holding disc.The equations of the cam profiles and the 3D model of the D-knotter were firstly obtained by reverse engineering.Secondly, based on the working condition and kine-matic analysis, the curves of the angular displacement, the angular velocity, and the angular acceleration of the wiper were obtained.Finally, this study verified the kinematic analysis by simulation.The results indicated that when the cam rotation angle (φ) is 34.32°the wiper angular velocity is the global maximum value.Around this angle, the knife should cut the rope and the twine holding disc should stop turning before cutting rope.The design intention of concave arc in the cam profiles is to promote the angular velocity of wiper when the knife is cutting rope.With the design of con-cave arc, the angular velocity of wiper can be promoted about 18%.