Hinged sealing device and shield machine

Abstract

The invention provides a hinged sealing device and a shield machine. The hinged sealing device is arranged between a first object and a second object, wherein the first object and the second object are hinged to each other; the hinged sealing device comprises an outer joint connected with the first object, an inner joint connected with the second object, and a sealing assembly arranged between theinner joint and the outer joint, the sealing assembly comprises a sealing ring and a supporting part arranged in the sealing ring, and the sealing ring is always abutted between the inner joint and the outer joint through the supporting part when the first object and the second object are eccentric or deviated. The shield machine comprises a middle shield, a tail shield and a hinged sealing device as described above, wherein the middle shield is the first object of the hinged sealing device, the tail shield is a second object of the hinged sealing device. The hinged sealing device and the shield machine have the advantages that the sealing effect of the hinged position is guaranteed, the structure is compact, the installation is convenient, and the like.

Description

technical field [0001] The invention relates to the field of shield machine sealing, in particular to a hinged sealing device and a shield machine. Background technique [0002] Projects such as urban subway construction and major water diversion projects require shield machines to excavate tunnels. In order to adapt to actual excavation geological conditions and avoid road building foundations and original underground facilities, shield machines need to turn during the excavation process. The shield body of the shield machine is composed of a front shield, a middle shield and a tail shield. Usually, the middle shield and the tail shield are connected by hinges to meet the turning requirements of the shield machine. In order to prevent muddy water and sand from entering the inside of the shield machine, the seal at the hinge of the shield body is particularly important. [0003] The existing hinge seals have the following disadvantages: 1. The seal ring relies on the compre...

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Problems solved by technology

[0003] The existing hinged seals have the following disadvantages: 1. The sealing ring relies on the compression of the seal itself to form a seal, and its pressure bearing capacity is limited. When the groundwater pressure is too high, there is a risk of water and sediment breaking through the seal; 2. Due to Polyurethane has a high pressure bearing capacity, and polyurethane lip seals are more convenient to install than rubber lip seals, making them widely used in hinged seals, but polyurethane seals cannot be effectively compensated after failure, and can only be repaired by adding grease and adding an airbag device Remediation, the remedial equipment has high cost, complex structure, and difficult operation; 3. When the machining size error of the sealing ring installation groove is large, the sealing compression will be reduced, making the hinge sealing effect poor; 4. The wear resistance of the sealing material is poor, When the groundwater contains a lot of gravel and the turning frequency of the shield machine is high, the sealing surface will wear a lot, the sealing effect will be poor, and there will be hidden dangers in production safety; 5. The installation and fixing of the sealing ring is complicated

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