Fine adjustment type speed adjusting mechanism of self-help descent control device for high-rise escape

The utility model discloses a fine adjustment type speed adjusting mechanism of a self-help descent control device for high-rise escape and belongs to the field of machines. The fine adjustment type speed adjusting mechanism comprises an escape rope, a rack, a gear, a rope pressing wheel, a rope pressing wheel shaft, a speed adjusting sleeve, speed adjusting rods and screws. The gear is assembled on the rack through a shaft, the rack is provided with a U-type groove, the rope pressing wheel shaft is assembled in the U-type groove of the rack, and threads are arranged on the speed adjusting rods. The speed adjusting rods are assembled in threaded holes of the speed adjusting sleeve. The fine adjustment type speed adjusting mechanism further comprises fine adjustment mechanisms, worm gears and worms. Each fine adjustment mechanism comprises one worm gear and one worm. The worm gears are assembled on the speed adjusting rods through keys, the worms are assembled on the speed adjusting sleeve through bearings, an