Key parameters of knotting process of new knot tying device
                            HUANG Song tan, HU Chong, LV Jun jie, MA Liang liang, YING Fu qiang

（Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China）

Abstract: Aiming at the problem that the high labor cost and the low efficiency for the manual knotting of the hand bag of a packaging bag, the key parameters of knotting process were studied. The range of the key parameters of the around loop number and the knot moving distance were calculated based on the established three dimensional model of the knotting device. The kinematic simulation of the knotting process and the parametric modeling of knotting device were done by engineering analysis software Adams, the values of the angle of rotation and the knot moving distance were given, through the Matlab to draw the relation schema between the around rope number and the moving distance to further determined the value of key parameters. At last, a prototype was made for test and verification. The results indicate that the experimental data is similar that of theoretical calculation and simulation, which provide a certain reference for increasing the successful rate of knotting of hand bag and improving the structure of knotting device.

Key words: knotting device; virtual simulation; knot test; roping mechanism; knotting mechanism