| 摘要 |
machine-building hydraulic drives applicable in coal mining, machine building and other industries, particularly, in powered support for underground mining of coal and other minerals. SUBSTANCE: ram includes cylinder and extension member with extension piece. Extension member accommodates device for increase of supporting power and having rod with piston connected with cylinder bottom, piston hollow communicated with cylinder piston hollow and rod hollow with inlet for working fluid. Extension member is made in the form of plunger with hole for intake of working fluid to rod hollow for increase of supporting power. EFFECT: higher supporting power, simplified design and increased service life of hydraulic props of high supporting power. 1 dwg
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