A heavy-duty boom potential energy recovery system and control method for a large hydraulic excavator

Abstract

The invention provides a heavy load moving arm potential energy recovery system and method for a large hydraulic excavator. The system is applicable to mining machines. On the basis of an original moving arm hydraulic system, a variable displacement motor, an energy accumulator and a control valve set are arranged, the control valve set is connected with a rod cavity and a rodless cavity of a moving arm oil cylinder, and a control valve and a main valve are connected in parallel. The variable displacement motor, the control valve set and the energy accumulator are sequentially connected. High-pressure oil liquid of the rodless cavity of the moving arm oil cylinder is divided into three ways through the control valve set and enters the rod cavity of the moving arm oil cylinder, the energy accumulator and the variable displacement motor. The variable displacement motor is connected with an engine to form hybrid power to drive a main pump together. The system has the advantages of flow regeneration and hybrid power, the structure is simple, the energy conversion link is less, the energy utilization rate is high, the size of the energy accumulator is small, the auxiliary drive torque is large, the pump / motor power level is low, the occupied space of the system is small, control is flexible, and the system can adapt to the complex working condition.

Description

technical field [0001] The invention relates to a heavy-duty boom potential energy recovery system and a control method thereof, and is especially suitable for a heavy-duty boom potential energy recovery system and a control method of a large hydraulic excavator used in the mechanical field. Background technique [0002] Large-scale hydraulic excavators are key equipment for joint operations in open-pit mines. They are mainly equipped with large dump trucks for stripping topsoil and mining rock or coal. The weight of a large hydraulic excavator generally exceeds 100 tons, and the power of the whole machine can generally reach several thousand kW. The energy consumption is astonishing, but the efficiency of the whole machine is only about 20%. [0003] During the working process of the excavator, the boom is driven by the boom cylinder to lift the working device, and the lifting is frequent, and a large amount of potential energy is generated when the boom is lowered. Usuall...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the potential energy of the heavy-duty boom of a large hydraulic excavator is difficult to recycle, the present invention provides a heavy-duty boom potential energy recovery system and a control method suitable for a large hydraulic excavator, which can be efficiently recovered in a limited space Utilize huge amount of potential energy to improve the energy utilization rate of large hydraulic excavators

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