Pressure tracking valve controlled shield pushing hydraulic system

Abstract

The invention discloses a pressure tracking valve controlled shield pushing hydraulic system. The system comprises any number of pushing partitions with the same structure. Each pushing partition comprises one main control oil cylinder hydraulic branch system and any number of pressure tracking valve controlled oil cylinder hydraulic branch systems. Each main control oil cylinder hydraulic branchsystem comprises a proportional velocity regulating valve, a proportional pressure reducing valve, three one-way valves, an overflow valve, three two-way cartridge valves, three two-position three-wayreversing valves, a pushing oil cylinder and a pressure sensor. Each pressure tracking valve controlled oil cylinder hydraulic branch system comprises a pressure tracking valve, three one-way valves,an overflow valve, three two-way cartridge valves, three two-position three-way reversing valves and a pushing oil cylinder. Accordingly, pressure of the pushing oil cylinders in the main control oilcylinder hydraulic branch systems is tracked through the pressure tracking valves, rapid and precise cooperative control over the pressure of all pushing oil cylinders in the same shield pushing partition is achieved, the problem that when all the pushing oil cylinders adopt solenoid valves such as the proportional pressure reducing valves for control, pressure synchronization and adjusting timeis long is solved, pressure flow composite control over the pushing oil cylinders is achieved to some extent, the complexity of the shield pushing hydraulic system is simplified, and the reliability of the shield pushing hydraulic system is improved.

Description

technical field [0001] The invention relates to a fluid pressure actuator, in particular to a pressure tracking valve to control a shield propulsion hydraulic system. Background technique [0002] The shield boring machine is a large-scale construction machinery equipment integrating tunnel excavation, support, slag discharge, ventilation, drainage and other functions. During shield excavation, the cutterhead at the front of the main machine is driven to rotate by the cutterhead drive system, and the propulsion system provides propulsion to the cutterhead and adjusts the attitude of the cutterhead. The cutterhead continues to rotate and advance, and the tunnel is thus excavated and formed. The shield tunneling speed is fast, the safety is good, and the stability is high, and it can be used in more complicated working conditions. [0003] Shield propulsion system is one of the most important subsystems of shield tunneling. The current propulsion system mostly uses a solenoi...

AI Technical Summary

Problems solved by technology

The control strategy of one solenoid valve controlling one propulsion cylinder will bring problems such as long adjustment time and complex system when all cylinders are controlled cooperatively

[0004] In the Chinese invention patent of patent authorization announcement number CN 101864965 B, an energy-saving shield propulsion system with compound synchronous control of pressure and flow is mentioned. Coordinated control of the pressure of each propulsion cylinder in the zone

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