Hybrid-powered rotation driving system and construction machinery

Abstract

The invention discloses a hybrid-powered rotation driving system and construction machinery. The hybrid-powered rotation driving system comprises a master control valve and a rotary motor, wherein the master control valve is communicated with the rotary motor, and the rotary motor is used for being mechanically connected with a rotary platform. The hybrid-powered rotation driving system further comprises a first electric energy conversion unit, a second electric energy conversion unit, a hydraulic energy conversion unit and an energy accumulator, wherein the first electric energy conversion unit is used for converting mechanical energy of the rotary platform into electric energy and outputting the electric energy and is mechanically connected with the rotary platform, the second electric energy conversion unit is used for converting the electric energy output by the first electric energy conversion unit into mechanical energy and outputting the mechanical energy and is electrically connected with the first electric energy conversion unit, the hydraulic energy conversion unit is used for converting the mechanical energy output by the second electric energy conversion unit into hydraulic energy and outputting the hydraulic energy and is mechanically connected with the second electric energy conversion unit, and the energy accumulator is selectively communicated with the hydraulic energy conversion unit. According to the hybrid-powered rotation driving system, rotary inertia potential energy produced during the braking of the rotary platform is converted into electric energy, is then converted into hydraulic energy and is stored by using the energy accumulator, the energy recovery ratio is high, the structure is simple, and the reliability is high.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a hybrid power slewing drive system and construction machinery provided with the hybrid power slew drive system. Background technique [0002] With the rapid development of industrial technology worldwide, the problems of energy shortage and environmental pollution are becoming more and more serious. Among construction machinery, hydraulic excavators have gradually become the main object of widespread concern due to their large workload, high fuel consumption, and poor emissions. The main control valve of the hydraulic excavator is connected with the slewing motor. During the working process, by operating the main control valve, oil is supplied to the slewing motor, and the slewing motor drives the slewing platform to make slewing motion; A lot of heat is released during deceleration and braking. This part of energy is usually consumed on the valve port of the hydraulic va...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention proposes a hybrid power slewing drive system and construction machinery equipped with the hybrid power slewing drive system. It is further converted into hydraulic energy and stored in the accumulator. The power density of the hydraulic accumulator is high, which solves the problem of low energy recovery rate of electric hybrid power and reduces the high cost of using super capacitors to recover energy. The structure is simple and reliable high sex

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