Small butt locking device for space

The invention provides a small butt locking device for a space. The small butt locking device comprises a diving mechanism installed on a space station and a shell installed on a space test load. The diving mechanism comprises a fame, a positioning pin installation plate A, a coarse positioning pin A, a fine positioning pin A, a face detection switch A, a heating device, a motor, a temperature sensor, a speed reducer, a positioning pin installation plate B, a speed reducer support, a coarse positioning pin B, a face detection switch B, a fine positioning pin B, a potentiometer, a coupling, a potentiometer support, a pinion, a sliding guide bush, an optical axis, a bull gear, a screw, a fine positioning pin C, a face detection switch C, a positioning pin installation plate C, a locking detection switch, a drive rack, an unlocking detection switch, a switch installation plate, a face detection switch D, a locking pin A, a locking pin B, a floating connector socket and a nut. The small butt locking mechanism for the space is miniature and lightweight, and an astronaut does not need to participate in operation.