Three section telescopic mine support actuator - has tubes covered with thin stainless steel wear and corrosion resistant sleeves

摘要

A mine support with a roof member (3) support by a linkage arrangement (2) above a floor member (1) also includes a telescopic cylinder (5) between the roof and floor members. It is positioned on the conveyor side of the linkage. The cylinder consists of three telescopic sections (6, 7, 8). The smaller sections (7, 8) have a protective sleeve (9) shrank onto their outside, made of corrosion and wear resistant sleeve (9) on the outer cylinder is connected with a base (11). These protective sleeves can be of stainless steel, between 0.2 and 1 mm thick.