An anti-blocking device and method suitable for the foam nozzle of the cutter head of the shield machine

Abstract

The invention discloses an anti-blocking mechanism applicable to a shield tunneling machine cutterhead foam nozzle and a control method thereof. The device comprises multiple flushing pipelines, multiple flushing control assemblies, high pressure water inlet pipelines and multiple pneumatic ball valves. Each flushing control assembly comprises a foam pump, a pressure gauge, a flow meter, a foam generator, a foam sight mirror, a pressure sensor and a one-way valve which are sequentially installed on the corresponding flushing pipeline, wherein the pressure sensor is connected with an upper computer in a master control chamber through a feeder line. Each flushing pipeline is provided with one high pressure water inlet pipeline. Each high pressure water inlet pipeline is provided with one pneumatic ball valve. The water inlet ends of the multiple high pressure water inlet pipelines are collected together and then externally connected with a water source through an external connection pipeline. Due to the fact that the high pressure water inlet pipelines are arranged and provided with the pressure sensors, when the pressure value of one pipeline in the foam system is higher than the certain pressure, the upper computer displays alarm information to prompt an operator to flush the pipeline, and automatic flushing is achieved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a flushing and anti-blocking device and method for foam nozzles of cutterheads. Background technique [0002] During the tunnel construction process, according to the construction geological conditions, during shield excavation, foam is injected into the soil bin through the cutter head nozzle to improve the characteristics of the muck, stabilize the tunnel face, reduce the permeability coefficient of the muck, and at the same time play a role in water isolation , It is convenient for construction, and at the same time reduces the torque of the cutterhead and reduces the wear of the cutter. The normal injection of foam is related to the normal excavation of the shield machine. At present, the foam protection of the cutter head is mainly to install rubber pads at the nozzle, but the rubber pads will lose their protective effect due to wear and repeated use during the excavatio...

AI Technical Summary

Problems solved by technology

The normal injection of foam is related to the normal excavation of the shield machine. At present, the foam protection of the cutter head is mainly to install rubber pads at the nozzle, but the rubber pads will lose their protective effect due to wear and repeated use during the excavation process. Slowly enter the nozzle of the cutter head, thereby blocking the nozzle and making the nozzle unusable. In the past, when it was necessary to clean the blockage of the nozzle of the cutter head, the staff could only clean it with pressure into the bin or after the tunnel was excavated. Workers High labor intensity and certain danger

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