亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

Mining shovel is an important equipment in large open pit mining. In lifting operation, the highquality working device is driven by the lifting motor to lift and shovel into the material to realize excavation. When falling, under the gravity force of the working device, the lifting motor generates electricity. This distributed electric energy is often dissipated in the form of thermal energy through brake resistance, causing great waste of energy. In order to solve the above problems, an innovative driving scheme of hydraulic-electric hybrid shovel hoisting mechanism was proposed. A hydraulic pump/motor was added to the hoisting motor coaxially, and the inlet and outlet of the hydraulic pump/motor were connected with an hydraulic accumulator and tank respectively. When falling, under the action of working device gravity force, the hydraulic pump/motor and lifting motor provided braking torque to control the descending speed. At this time, the hydraulic pump pumped the lowpressure oil in the tank into the accumulator and the gravitational potential energy of the working device was stored in the accumulator; when lifting the working device, the device released highpressure oil, and the hydraulic pump/motor worked together with the lifting motor to lift the working device, so as to reduce the installed power and energy consumption of the lifting motor. In the research, the working principle of the driving scheme of the hydraulic-electric hybrid driving electric shovel hoisting mechanism was introduced; the principle testbed was set up to verify the hydraulic-electric hybrid driving scheme; the new hydraulic-electric combined simulation model of the electric shovel was established, and the hydraulic-electric hybrid electric shovel hoisting system was simulated and analyzed. The results showed that the installed power, the peak power and the energy consumption of the motor can be reduced by adopting this scheme. The method can be widely applied to all kinds of heavy lifting equipment driven by motors.