Influencing factors of the locking force of a locking mechanism

YU Fang1, LI Yi1, LI Jia-chun1, WU Bing1, ZHANG Jian-ming2

（1.School of Mechanical Engineering, Guizhou University, Guiyang 550025, China;
2.Guizhou Halei Aerospace Environmental Engineering Co., Ltd., Anshun 561000, China）

Abstract: In order to reduce the number of mechanism trials and latching force tests during the conventional design process of the rocket gun locking mechanism, the factors affecting the change of the locking force between the hook and the rocket contact surface friction coefficient, different loading loads and different mass rockets during the decoupling process were carried out. The Abaqus/Explicit was used to display the nonlinear dynamic analysis method, the decoupling process of the locking mechanism hook of a rocket during the launching process was simulated. The working mechanism of the locking mechanism was studied, which affected the locking mechanism in the working process. The factors affecting the blocking force were quantitatively analyzed. The results show that when the mass of the projectile increases by 50%, the decoupling time and the blocking force increase by about 13.4%. By comparing the experimental data of the projectile quality and the simulation results, the simulation analysis shows that the error between the simulation analysis and the actual situation is 1.5%, the error is small, and the credibility is high.

Key words: locking mechanism; blocking force; decoupling process; design of blocking force