Shield cutter disk drive hydraulic system

Abstract

The invention discloses a shield cutter disk drive hydraulic system, which relates to a multi-pump-control multi-motor system and aims to provide a hydraulic control system which can realize stepless speed change and has the advantages of saving energy sources and flexibly reversing, along with high synchronicity, simple structure and the like. The shield cutter disk drive hydraulic system comprises at least two hydraulic pump stations, a plurality of bidirectional hydraulic motors and three-position four-way change valves which have the same quantity as the hydraulic pump stations, wherein the oil suction ports S of the hydraulic pump stations are communicated with an oil tank respectively; the oil inlets P1 of the three-position four-way change valves are communicated with the oil outlets A of the hydraulic pump stations respectively; the working oil ports A1 of the three-position four-way change valves are communicated with the working oil ports R of all the bidirectional hydraulic motors; the working oil ports B1 of the three-position four-way change valves are communicated with the working oil ports L of all the bidirectional hydraulic motors; the oil return ports T1 of the three-position four-way change valves are communicated with the oil tank; each hydraulic pump station comprises a pump station motor and a plunger type electrohydraulic proportion variable pump; and the plunger type electrohydraulic proportion variable pumps are constant-power variable pumps with pressure cutting-off functions.

Description

technical field [0001] The invention relates to a hydraulic control system, in particular to a multi-pump and multi-motor open hydraulic circuit for controlling a shield cutter head. Background technique [0002] The shield cutter head drive system has the characteristics of large power and wide power variation range. The load of the cutter head changes with the soil condition of the excavation section, and the cutting torque and speed required for cutting hard rock and soft rock change greatly. If the system form of valve-controlled motor is used, the system power must be designed according to the maximum power required. When encountering under-load conditions, the system efficiency is low, and a large amount of power is dissipated in the form of heat, which makes the system seriously heated. [0003] In the prior art, there are mainly two driving forms of the shield cutterhead, one is motor frequency conversion drive, for example, a shield cutterhead driving variable freq...

AI Technical Summary

Problems solved by technology

However, its disadvantages are small power-to-volume ratio, large space occupation, and small escape torque, that is, poor overload capacity.

The other is driven by a hydraulic closed system. For example, a Chinese utility model patent CN200820167913 discloses a shield cutterhead hydraulic system that adopts motor series-parallel hybrid drive. The cooling system has low efficiency, and the commutation is not easy to synchronize when multiple pumps are connected in parallel to supply oil

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