Soldering-free riveted joint-free hydraulic prop for mining

• Main Author: XUEHENG,FU YANG
• Format: Patent
• Language: English
• Published: 18.04.2007
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The utility model relates to a soldering-free riveted joint-free hydraulic prop for caving face top plate and tunnelling place supporting in mining, which comprises a base, an extended fuel tank, a piston, a three-in-one valve seat, a movable prop, a hand-hold section, a reset spring and a head cover, wherein the lower part of the movable prop is arranged in the extended fuel tank and the upper art of the movable prop gets through the hand-hold section, and the top end of the movable prop is connected to the head cover, The piston is arranged in the lower part of the movable prop and the reset spring arranged in the movable prop. A bearing pin is horizontally inserted in the tank wall in the middle of the extended fuel tank with a tee structure internal head connected to the bearing pin, and a two-way open triple duty valve seat is sheathed over the bearing pin, and an oil injection and a pressure relief hole communicated with the triple duty valve seat and the inner end enclosure is arranged in the bearing pin; the upper and the lower part of the reset spring are connected with the upper part of the movable prop and the inner end enclosure respectively. As during triple duty valve seat installation process, the extended fuel tank need not to be disconnected and the triple duty valve seat is two-way open and outer sheath cylinder structure, the mechanical strength of the fuel tank is maintained and enhanced.