Improved shield master driving HBW grease injection device and control method thereof

Abstract

The invention discloses an improved shield master driving HBW grease injection device and a control method thereof. The device comprises multiple soil chamber pressure sensors, multiple grease cavity pressure sensors, a pneumatic grease pump and an electric ball valve, wherein the soil chamber pressure sensors are evenly distributed in front of a shield shell and a main driving shell and used for detecting soil pressure in a soil chamber; the grease cavity pressure sensors are correspondingly arranged in HBW grease cavities in the positions of grease injection inlets respectively and used for detecting HBW grease pressure in the HBW grease cavities; the pneumatic grease pump is used for pumping HBW grease to each grease injection inlet; the electric ball valve is installed at an outlet of the pneumatic grease pump and used for controlling the on-off state of a grease channel in front of the pneumatic grease pump. When a controller detects that the difference value between the soil pressure and the HBW grease pressure is larger than or equal to the preset allowable maximum difference value, the electric ball valve is controlled to be opened and the pneumatic grease pump is controlled to pump the HBW grease. According to the pressure in the soil chamber, the injection pressure of the HBW grease is changed, so that the injection amount of the HBW grease is precisely controlled, consumption of the HBW grease is reduced, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of shield machines, in particular to an improved shield machine main drive HBW grease injection device and a control method thereof. Background technique [0002] The shield machine is often used in the excavation of subway tunnels, subsea tunnels, road tunnels, etc. Tunnel construction machinery that does not affect ground traffic during excavation. [0003] The basic working principle of the shield machine is to excavate the soil by pushing forward the front shield body along the tunnel axis, and a turntable is installed in front of the shield body, and the turntable is covered with wear-resistant cutters. Squeeze to break and cut underground soil, sand and stones, etc., and the rotation of the shield shell is driven by the main drive. [0004] At present, during the tunneling construction process of the shield machine, the performance of the main drive directly affects the tunneling efficiency of the sh...

AI Technical Summary

Problems solved by technology

In order to ensure the sealing effect of HBW, domestic injection of HBW grease usually adopts the flow control method, that is, regardless of the pressure of the soil bin at the cutter head, the amount of grease extruded is equal. This method cannot be accurately output according to the actual geological situation, thus causing grease Big waste

At the same time, in the case of mud cake forming outside the HBW grease chamber, the outlet of the HBW grease chamber is blocked, and the grease cannot be discharged in time, resulting in excessive sealing pressure, resulting in grease backflow, seal rollover, and great potential safety hazards

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