An energy-saving hydraulic system for a crane and the crane

Abstract

The invention discloses an energy-saving hydraulic system for a crane and the crane. The energy-saving hydraulic system comprises a first hydraulic power device, a first gear pump, a torque sharing device, an energy recovery device, a main switching valve and a first switching valve, wherein an oil outlet of the first gear pump is connected with a first working oil hole of the first switching valve, a second working oil hole of the first switching valve is connected with an oil inlet of the first hydraulic power device, an oil outlet of the first hydraulic power device is connected with a first working oil hole of the main switching valve, and a second working oil hole of the main switching valve is communicated with a rodless cavity of an amplitude-variable oil cylinder; a torque output by an engine is input into the first hydraulic power device by virtue of the torque sharing device, and potential energy generated by the gravity is input into the energy recovery device through the torque sharing device so as to realize energy recovery. The hydraulic system and the crane have the advantages that the speed and working efficiency of the system are increased, the working efficiency of the whole engine is increased, the energy recovery and utilization are realized, and the energy utilization rate is effectively improved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an energy-saving hydraulic system for a crane and the crane. Background technique [0002] Most of the current cranes are fully hydraulic cranes, and the efficiency of the hydraulic system is relatively low, and a lot of energy is converted into heat energy and consumed. The open system is that the hydraulic pump absorbs oil from the oil tank, passes through the control valve to the actuator, and the oil discharged from the actuator returns to the oil tank. The oil can be cooled in the oil tank, which is a common method for hydraulic systems. The closed system is that the hydraulic pump inputs the oil into the oil inlet of the actuator, and the oil discharged from the actuator is directly supplied to the oil suction port of the hydraulic pump. The variable pump is mostly used for reversing. The circuit structure is compact, but the heat dissipation condition is poor...

AI Technical Summary

Problems solved by technology

In modern hoisting machinery, users have higher and higher requirements for energy saving. The existing hydraulic system of cranes has the following disadvantages: 1. The energy of the small and medium tonnage hydraulic system is not easy to recover; 2. The energy of the telescopic luffing system of large tonnage cranes It is not easy to recycle; 3. The fretting and smoothness of the winch system with small and medium tonnages are not ideal; 4. There are many pump sets in the large tonnage system, which takes up a lot of space, complicated layout and heavy weight

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