When operated by a machine, the two bevel gears disengage from the engaging state, and the worm gear and the worm are engaged for driving;
机动时，两个锥齿轮脱离啮合状态，蜗轮、蜗杆啮合传动；
When operated by a machine, the two bevel gears disengage from the engaging state, and the worm gear and the worm are engaged for driving;
机动时，两个锥齿轮脱离啮合状态，蜗轮、蜗杆啮合传动；
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