where In is the total moment of inertia of the screws and other rotating parts of the connection mechanism; is the pitch of the screw, is the angle between the screws in the pair. The actual value of the applied mass is relatively small: for the APDA . The diameter of the screws is calculated from the condition of stability during shock absorption and from the bearing capacity of the ball-screw converter during coupling and shock absorption. To transfer the rotation of the nuts of the converter to the hull of the assembly double (in the rotation transmission) two- stage hinges are needed. The APDA uses a construction with conical gears (Figure 3.13). Due to the large number of moving parts, these hinges must be protected. After testing, moving and flexible casings are introduced in the construction of the APDA. These units are constructed considering the requirements on parts of the docking mechanism which operate during shock absorption (minimal moment of inertia and friction). Just as in the “rod and cone” type docking mechanism, the electrical connections from the ring with the guides are extended by spiral spring cables with a course of up to 0.6 m (see, for example, Figures 1.8 and 1.25). However, in peripheral docking devices these cables are free and provide arbitrary linear and angular displacements of the ring. 3.5. Basic Elements of the Docking Device 3.5.1. Drives Electrical drives are used in electromechanical docking devices (see for example, Figure 3/5). These drives are used to perform the following basic operations: 1) displacement of the rod or ring with guides; 2) opening and closing of locks of the docking frame; 3) release and elevation of the latches; 4) opening and hermetization of the hatches.
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