Electro-hydraulic hybrid power drive system of tunneling machine and control method

Abstract

The invention provides an electro-hydraulic hybrid power drive system of a tunneling machine and a control method and belongs to the field of tunneling machinery. The system comprises a main motor, the main motor is connected with a cutting head through a speed reducer and a cutting arm and is connected with a hydraulic pump / motor, an oil supplement motor is connected with an oil supplement pump, and the oil supplement pump is communicated with an energy accumulator, an overflow valve and a pressure sensor; an oil tank passes a first one-way valve and then is connected with an oil inlet of the oil supplement pump and an oil inlet of a two-position two-way electromagnetic reversing valve through pipelines, the two-position two-way electromagnetic reversing valve is communicated with the energy accumulator, the overflow valve and the pressure sensor, and an oil outlet of the overflow valve is communicated with the oil tank; the pressure sensor detects pressure of the energy accumulator and transmits an output signal to a controller; a rotation speed sensor detects the rotation speed of the main motor and transmits a rotation speed signal to the controller and a frequency changer. The tunneling machine can overcome a peak load smoothly during working if the tunneling machine runs across a barrier in the tunneling process, and the reliability of the tunneling machine is improved.

Description

technical field [0001] The invention relates to the field of excavation machinery, in particular a hybrid drive system composed of motor frequency conversion technology combined with a hydraulic pump / motor to overcome the peak load during the excavation process. Background technique [0002] The roadheader is mainly used for roadway excavation in mines and underground engineering. Because the roadheader has the advantages of fast driving speed, good roadway formation and stability, good support, small amount of work, low labor intensity, and production safety, etc., the roadheader is becoming more and more popular. The more it is used in construction projects such as urban road traffic, railways, highways, water conservancy, and municipal engineering. [0003] Since the roadheader works in a complex and harsh working environment, obstacles such as rocks in the working environment will increase the workload of the cutter head of the roadheader instantly. The traditional metho...

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Problems solved by technology

[0003] Since the roadheader works in a complex and harsh working environment, obstacles such as rocks in the working environment will increase the workload of the cutter head of the roadheader instantly. The traditional method is to let the motor work at a higher power at this time. After overcoming the peak load, the motor returns to low power operation, such frequent switching seriously affects the normal working life of the motor

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