A closed-type energy-saving shield propulsion hydraulic system driven by multiple pumps

Abstract

The invention discloses a closed type energy-saving type shielding propelling hydraulic system adopting multi-union-pump driving. The system comprises a motor, a multi-union variable pump, a check valve, an overflow valve and a hydraulic cylinder. Zone control is adopted by the propelling system, independent oil sources are adopted by zones to supply oil, the zones of the system can be independently controlled, and the coordination control over the zones can be achieved. Due to coaxial connection of the multi-union variable pump, under the condition that the set discharge capacity is the same, the synchronous motion of hydraulic cylinder propelling of the zones can be easily achieved; the propelling system can achieve stepless real-time adjusting of the propelling speed, and due to the fact that a closed-type volume adjusting system adopting the variable pump to control the hydraulic cylinder is compact in structure and small in size, energy waste caused by flow adjustment of an existing system adopting a throttling element is avoided, the obvious energy saving effect is achieved, the working environment can be effectively improved, and the system is particularly suitable for being applied to control of a propelling system of a shielding tunneling machine.

Description

technical field [0001] The invention belongs to the technical field of hydraulic systems, and relates to a fluid pressure actuator, in particular to a closed energy-saving shield propulsion hydraulic system driven by multiple pumps. Background technique [0002] Shield is a modern high-tech excavation equipment specially used for underground tunnel construction. The propulsion system is an important part of the shield machine, which provides the driving force for the shield machine to move forward. The propulsion system consists of many hydraulic cylinders distributed along the circumferential direction of the shield section as the actuator output power. In order to facilitate coordinated control, the hydraulic cylinders usually adopt the method of regional control, and the shield tunneling attitude control is completed through the coordinated jacking action of a certain number of hydraulic cylinders in each area. Therefore, the synchronization and coordinated control of t...

AI Technical Summary

Problems solved by technology

On the other hand, the construction space of underground tunnels is very limited, which puts forward higher requirements on the structural complexity and heat generation of the drive system

The existing hydraulic system using centralized oil source plus group valve control is an open system with complex structure and large oil tank

Due to the large throttling loss at the hydraulic valve port, the system is prone to heat, which not only wastes energy, affects the life of the equipment, but also deteriorates the construction environment

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