Rotating speed variable driving shield cutterhead energy-saving hydraulic control system

Abstract

The invention discloses a variable speed drive shield disc cutter energy saving hydraulic control system, which comprises a main hydraulic circuit consisting of a variable speed motor, a two-way hydraulic pump, a one-way valve, a hydraulic motor, a hydraulic lock and a change valve; and a feed circuit. The output rotation speed of an asynchronous motor driving the two-way hydraulic pump is variable speed controlled. The output signal of a rotary speed controller is adjusted in real time according to the rotation speed required to cut earth by a disc cutter to change the rotation speed of the asynchronous motor, thus controlling the output flow of the two-way hydraulic pump and driving the hydraulic motor to output the moment and the rotation speed that the disc cutter requires to overcome the load. The main hydraulic circuit adopts a closed type hydraulic circuit, and directly feeds the oil of the oil discharge outlet of the hydraulic motor into the inlet port of the motor through the two-way hydraulic pump, thus reducing the volume of a hydraulic system pumping station. Two stages of high and low working pressure are provided so that the shield disc cutter can work on two different geological conditions of soft ground and hard rock. By adopting variable speed control, the output flow of the hydraulic pump is matched with the load power of the disc cutter, thus significantly saving the energy.

Description

technical field [0001] The invention relates to a fluid pressure actuator, in particular to an energy-saving hydraulic control system for a variable speed driven shield cutter head. Background technique [0002] The shield cutter drive system is an important part of the shield machine, and it undertakes the task of driving the cutter to rotate and cut the soil on the excavation surface and stir the soil in the sealed cabin. It has the characteristics of large power and wide range of power variation. The driving system of the cutter head must have high reliability and good operating performance. If the valve-controlled motor is used for hydraulic drive, the system power will be designed according to the maximum power required. In the case of under-load conditions, the circuit has a large Overflow loss and throttling loss, the system efficiency is low, and a large amount of power will be dissipated in the form of heat, which will cause serious heating of the system and affect...

AI Technical Summary

Problems solved by technology

The driving system of the cutter head must have high reliability and good operating performance. If the valve-controlled motor is used for hydraulic drive, the system power will be designed according to the maximum power required. In the case of under-load conditions, the circuit has a large Overflow loss and throttling loss, the system efficiency is low, and a large amount of power will be dissipated in the form of heat, which will cause serious heating of the system and affect the propulsion speed of the shield machine

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