Method and structure for preventing muddy water from entering precise matching part in shield tool changing gate valve

• Main Authors: LYU XINCHUN, LYU BINJIE, LEI LIN, MA YABIAO, WANG JIANGTAO, LIU RUIYUAN
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2022
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; CYLINDERS; DEVICES FOR VENTING OR AERATING; EARTH DRILLING; ENGINEERING ELEMENTS AND UNITS; FIXED CONSTRUCTIONS; GALLERIES; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LARGE UNDERGROUND CHAMBERS; LIGHTING; MECHANICAL ENGINEERING; MINING; PISTONS; SEALINGS; SHAFTS; TAPS; THERMAL INSULATION IN GENERAL; TUNNELS; VALVES; WEAPONS

The invention relates to a method for preventing muddy water from entering a precise matching part in a shield knife-changing gate valve, which comprises the following steps of: injecting sealing grease into a cavity formed by an outer cylinder of a hob, a muddy water side valve body, a knife-changing side valve body, a left gate plate and a right gate plate, so that the sealing grease is filled and reaches the precise matching part; in the hobbing cutter replacement process, external muddy water is prevented from making contact with the precise matching part through sealing grease, and the precise matching part in the shield cutter replacement gate valve is protected; the invention further relates to a shield knife-changing gate valve structure for preventing muddy water from entering an internal precise matching part, an oil filling hole and an inspection hole are formed in the knife-changing side valve body, and the oil filling hole and the inspection hole are respectively communicated with the split gate