HYDRAULIC STANDS FOR SECTIONS OF SHIELD MECHANISED SUPPORT AND COLLAR-HOLDERS FOR THESE HYDRAULIC STANDS Russian patent published in 2010 - IPC E21D15/44 E21D15/51 F16J9/12 

FIELD: mining.

SUBSTANCE: hydraulic stand for sections of shield mechanised support with external cylindrical tubular shell, with unit of piston stem extended under loading pressure of working fluid, with at least one circular cavity between external cylindrical tubular shell and unit of piston stem, and with collar holder fixed at the end of cylindrical tubular shell, locking circular cavity at the end by longitudinal edge. Collar holder contains at least one receiving groove at inner side of longitudinal edge for sealing or guiding element to seal circular cavity and to move unit of piston stem, at the same time collar holder is made of hardened steel. At least one edge of receiving grooves is equipped with or is formed by welded seam passing along perimetre and additionally processed, welded from bronze.

EFFECT: less damages in zone of seals, possibility to use collar holder after repair, less costs for repair of hydraulic stands.

14 cl, 3 dwg