Abstract: In view of the problems that there are multiple threaded core-pulling mechanism and the intersection of slide blocks in military telescopes, the structure of their plastic parts was first analyzed, and then a motor which drives the gear core-pulling mechanism was adopted and multiple limit switch controllers were also used to design the relevant injection mold. Such a design made the mold work in good order and also resolved the demolding difficulty. The fabricated mould exhibited a stable run cycle and an ordered motion for various sliders during the demolding process. This mould has been used for mass production, and the obtained parts gain a good quality with a process yield over 98 %.

Key words: intersectional slide block, screw-thread core pulling, military telescope, injection mould, motor, gear transmission