Shield rotary joint auxiliary sealing device

Abstract

The invention discloses a shield rotary joint auxiliary sealing device. The shield rotary joint auxiliary sealing device comprises a seal pressing plate, a first bolt, a seal and a seal baffle ring; the seal pressing plate and a stuffing box cover plate are fixed to a center partition plate through the first bolt; the seal baffle ring is welded to the edge of the annular inner side of the stuffingbox cover plate, stuffed in a channel built by the stuffing box cover plate, the seal baffle ring and a rotary joint rotor in a sealing mode and compacted by an annular boss of the seal pressing plate to sufficient fill the whole seal channel, so that the sealing effect is achieved. The shield rotary joint auxiliary sealing device is simple in structure and convenient to replace, and the sealingperformance of a rotary joint is improved.

Description

technical field [0001] The patent of the present invention relates to the technical field of mechanical seals, in particular to a sealing structure for a rotary joint of a shield machine. Background technique [0002] During the tunnel construction process of the shield machine, it is necessary to ensure that the soil bin is isolated from the inside of the shield body to prevent dregs and muddy water from entering the interior of the soil bin. However, the central rotary joint of the shield machine needs to pass through the soil bin to connect the shield body and the cutterhead, and transport various additives such as water and foam required by the cutterhead during excavation to the cutterhead, and the central rotary joint and the cutterhead rotate together. The traditional central rotary joint is designed with several lip seals to prevent muddy water from entering the shield body. However, under the action of the muddy water pressure in the soil tank and the vibration of t...

AI Technical Summary

Problems solved by technology

The traditional central rotary joint is designed with several lip seals to prevent muddy water from entering the shield body. However, under the action of the muddy water pressure in the soil tank and the vibration of the rotary joint during the rotation of the cutterhead, the seals at this place may fail. Happening

In addition, if the lubricating channel inside the stuffing box of the rotary joint is blocked or the supply of lubricating grease is insufficient, it is easy to cause the three lip seals to be damaged by impurities such as muck entering the soil bin, resulting in the influx of muck, mud, etc. inside the soil bin Inside the shield, there is a great potential safety hazard

Moreover, in the tunnel construction environment, the stuffing box of the rotary joint is not easy to disassemble and replace the seal, and in the case that the soil warehouse needs to be kept under pressure, there is no condition for disassembly and replacement of the seal.

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