External mud door sealing system for slurry balance shield machine

Abstract

The invention discloses an external mud door sealing system for a slurry balance shield machine. The external mud door sealing system comprises a door plate, a partition plate and a driving device; anexcavation bin is formed in the outer side of the partition plate, and an air cushion bin is formed in the inner side of the partition plate; a door hole is formed in the partition plate; the inner side face of the door plate is tightly attached to the outer side face of the partition plate; the driving device is located on the inner side of the partition plate; the bottom of the door plate penetrates through the door hole through a connecting piece to be connected with the driving device; and the driving device is used for controlling the door plate to move up and down along the outer side face of the partition plate so as to close or open the door hole. The door plate is arranged on the outer side of the partition plate, thus during closing, the door plate is compressed on the outer side of the partition plate through the pressure difference between the excavation bin and the air cushion bin, and thus the sealing effect of a mud door can be improved.

Description

technical field [0001] The invention relates to the technical field of mud-water balance shield machines, in particular to an external mud door sealing system. Background technique [0002] With the development of shield construction technology, the mud-water balance shield machine in the shield tunneling machine has been widely used in tunnel projects with high requirements such as crossing the river, crossing the sea and requiring higher settlement due to its excellent pressure control performance. As an important auxiliary device of the mud-water balance shield machine, the mud door plays a key role in the operation of the staff entering the air-cushion chamber at atmospheric pressure for the maintenance of the rock crusher. [0003] The traditional mud door is located inside the air-cushion tank. After the mud door is closed, by injecting liquid or gas into the inflatable sealing ring installed on the mud door plate, the sealing ring expands and then presses the cover ti...

AI Technical Summary

Problems solved by technology

This type of mud door needs to withstand the huge mud pressure from the excavation cabin after the air cushion cabin is depressurized, and this pressure makes the mud door unable to compress the tight surface, and its sealing effect is completely dependent on the compression of the sealing ring. The performance of the ring and the reliability of the system are high, and the operating environment at the bottom of the air cushion chamber is harsh, and the sealing ring is easily damaged, resulting in poor sealing effect

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