Energy-saving shield segment assembling and positioning electro-hydraulic control system adopting load-sensitive technology

Abstract

The invention discloses an energy-saving shield segment assembling and positioning electro-hydraulic control system adopting a load-sensitive technology. The system comprises a motor, a variable pump, a two-position three-way proportional reversing valve, a variable cylinder, an overflow valve, a pressure reducing valve, a pressure compensating valve, a one-way valve, a multi-way valve, a balancing valve, a hydraulic lock, a hydraulic motor, a hydraulic cylinder, a moment rotation speed sensor, a displacement sensor and a pressure sensor. The multi-way valve with the pressure compensating valve in a segment assembling system is used for controlling the rotation speed of the hydraulic motor for driving the segment assembling machine to rotate and the moving speed of each hydraulic cylinder. The pressure sensor is used for detecting the pressure of a main oil passage of the system and the working pressure of each executer in real time; and a computer control unit is used for determining a variable pump control signal according to a system pressure signal, so that the displacement of the variable pump is changed with the load change so as to achieve load sensitive control. According to the invention, energy waste caused by continuous oil supply at the highest working pressure of the traditional system is avoided, the throttling loss and overflow loss are greatly reduced, and an obvious energy saving effect is obtained.

Description

technical field [0001] The invention relates to a fluid pressure actuator, in particular to an electro-hydraulic control system for assembling and positioning shield segments using load-sensing technology. Background technique [0002] Shield boring machine is a modern high-tech excavation equipment widely used in underground tunnel construction. It integrates mechanical, electrical, hydraulic, control and other technologies, and realizes the mechanization and automation of tunnel excavation. Compared with traditional construction methods, it has the advantages of safe and fast construction, high engineering quality, small ground disturbance, and low labor intensity. As a high-energy-consuming construction machine, the shield boring machine is developing in the direction of high efficiency and low energy consumption. [0003] The segment assembly machine is an important part of the shield machine. After the advancing distance of the shield machine reaches the width of a rin...

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Problems solved by technology

During the rotation of the segment assembly machine, the load moment of the motor changes with the rotation of the assembly machine. In addition, there are great differences in the load among the three movements of rotation, radial expansion and horizontal sliding. In the system form of high-speed valve-controlled motor and valve-controlled hydraulic cylinder, the oil supply pressure of the system must be set according to the system pressure required for the maximum working load, which makes the system work under low load conditions, the system efficiency is low, and the system generates serious heat. This will affect the life of the equipment while deteriorating the tunnel construction environment

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