To meet the in-orbit maintenance requirements of malfunctioning satellites and maintenance satellites rigid connections, a new type of latching mechanism based on satellite-rocket docking ring is proposed, which has light weight, good structural stiffness, simple motion and locking mechanism, simple control logic, high reliability and large range of docking ring size adaptation. A multi-body dynamic model of the docking ring latch mechanism, malfunctioning satellite and maintenance satellite were established, the maximum locking force and maximum friction of the latch mechanism and the maximum stress of the latching joint and crank of the direct force component were analyzed, and the change of locking force and friction under the three typical in-orbit maneuvering conditions were studied. The results show that: the maximum locking force and maximum friction of the latch mechanism on the docking ring is 1300N and 320N, respectively, stable locking force and friction are 300N and 80N, respectively, the maximum stress occurs on connecting rod which is 865 MPa; In-orbit maneuvering has little effect on the locking force and friction of the docking ring latch mechanism, and the docking ring latch mechanism can always lock the malfunctioning satellite steadily and reliably.

为满足故障卫星和维修卫星刚性连接的在轨维修需求，提出了一种基于星-火箭对接环的新型闭锁机构，具有重量轻、结构刚度好、运动和锁定机构简单、控制简单等特点。逻辑性、可靠性高、对接环尺寸适应范围大。建立了对接环插销机构、故障卫星和维修卫星的多体动力学模型，分析了插销机构的最大锁紧力和最大摩擦力以及直接分力的插销接头和曲柄的最大应力，并研究了三种典型在轨机动条件下锁定力和摩擦力的变化。结果表明：对接环上的闩锁机构的最大锁紧力和最大摩擦力分别为1300N和320N，稳定锁紧力和摩擦力分别为300N和80N，连杆产生的最大应力为865 MPa；在轨机动对对接环锁机构的锁定力和摩擦力影响很小，对接环锁机构始终能稳定可靠地锁定故障卫星。