Proportional-control high-precision propelling hydraulic system for earth pressure balance shield tunneling machine and control method

Abstract

The invention relates to a proportional-control high-precision propelling hydraulic system for an earth pressure balance shield tunneling machine and a control method. The proportional-control high-precision propelling hydraulic system for the earth pressure balance shield tunneling machine comprises a PLC, a variable pump, an overflow valve, a proportional pressure reducing valve, a first one-way valve, a second one-way valve, a first hydraulic-control one-way valve, a second hydraulic-control one-way valve, a two-position and three-way electromagnetic reversing valve, a three-position and four-way electromagnetic reversing valve, a displacement sensor, an execution mechanism, and a pressure sensor. The proportional pressure reducing valve and the variable pump are used for controlling the pressure and flow of the system, and closed-loop control is formed by the proportional pressure reducing valve, the variable pump and the pressures sensor and the displacement sensor of the execution mechanism, so that the speed and pressure control precision of the system is improved, the shield tunneling machine can make axial movement and accurately achieve synchronous movement according to a specific route track during tunneling construction, and the problem of low efficiency of a hydraulic system can be solved.

Description

technical field [0001] The invention relates to an underground shield construction equipment, in particular to an earth pressure balance shield machine ratio [0002] Controlling a high-precision propulsion hydraulic system and a control method. Background technique [0003] In the field of propulsion systems for underground shield construction, quantitative pumps are generally used to supply oil, and there are overflow losses [0004] and throttling loss, the system has large energy loss and low efficiency; using ordinary control valves for speed and pressure control cannot accurately control the movement of the propulsion system and cannot perform stepless speed regulation; when the hydraulic actuator needs to shrink quickly [0005] It is also impossible to carry out precise control when returning. Contents of the invention [0006] In order to overcome the above-mentioned shortcomings of the hydraulic propulsion system of the earth pressure balance shield machine in ...

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Problems solved by technology

[0003] In the field of propulsion systems for underground shield construction, quantitative pumps are generally used to supply oil, and there are overflow losses

[0004] and throttling loss, the system has large energy loss and low efficiency; using ordinary control valves for speed and pressure control cannot accurately control the movement of the propulsion system and cannot perform stepless speed regulation; when the hydraulic actuator needs to shrink quickly

[0005] precise control over time

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