EXPANSION MECHANISM, ENGINEERING MACHINERY AND FIRE-FIGHTING MACHINERY

摘要

Provided are an expansion mechanism, engineering machinery and fire-fighting machinery. The expansion mechanism comprises: at least two tubes nested one within another; the two adjacent tubes are respectively a first tube (1) and a second tube (3); and the second tube is located inside the first tube. The expansion mechanism also comprises a slider component installed between the first tube and the second tube. The slider component comprises: a slider (10) installed between the first tube and the second tube of the expansion mechanism; slider baffles (31, 33) installed on the first tube and located on a side of the slider longitudinal to the expansion mechanism along the frame of the tube; the slider baffles having a limiting part oriented towards the slider; the slider having limited parts adapted to the shape of the limiting parts and oriented towards the slider baffles; and the limiting parts and the limited parts forming a snap-on structure to fix the slider on the first tube in a snap-on fashion. The expansion mechanism effectively solves the problem in the prior art of a slider easily becoming loose and falling off.