Stepless adjustable linkage arm assembly

The utility model discloses a stepless adjustable linkage arm assembly. The mechanism comprises a movable linkage arm with a first barb, a fixed linkage arm with a second barb, an adjusting worm and an adjusting worm wheel matched with the adjusting worm, the first barb is movably connected and fixed with the movable linkage arm and the fixed linkage arm through hooking of the first barb and the fixed linkage arm and hooking of the second barb and the movable linkage arm respectively; a mounting cavity is formed in the movable linkage arm; the adjusting worm extends into the mounting cavity ina penetrating manner; the adjusting worm wheel and the adjusting worm are meshed and fixed in the mounting cavity, an eccentric column of the adjusting worm wheel extends out of the mounting cavity and can be limited in a long hole in the fixed linkage arm in a sliding mode, the adjusting worm wheel is driven to move through stepless adjustment of the adjusting worm, and the eccentric column of the adjusting worm wheel e