Hydraulic source and hydraulic energy recycling system for non-road mobile machine

Abstract

The invention belongs to the field of non-road mobile machines, and particularly relates to a hydraulic source and hydraulic energy recycling system for a non-road mobile machine, which comprises a first hydraulic pump, a second hydraulic pump, a third hydraulic pump and a fourth hydraulic pump, the first oil supply channel is connected between an oil outlet of the first hydraulic pump and an oil inlet of the hydraulic actuating module; the oil return channel is connected to an oil return opening of the hydraulic actuating module; an energy storage module; the energy storage module is connected to the oil return channel and comprises an energy accumulator and an energy storage control valve; the pressure compensation oil channel is connected between the energy storage module and an oil inlet of the first hydraulic pump, and a pressure compensation control valve used for controlling the pressure compensation oil channel to be connected or disconnected is arranged on the pressure compensation oil channel. The hydraulic power loss of the non-road mobile machine is reduced, the power consumption is reduced, and the energy utilization rate is improved.

Description

technical field [0001] The invention belongs to the field of non-road mobile machines, and in particular relates to a hydraulic source and hydraulic energy recovery and reuse system for non-road mobile machines. Background technique [0002] There are many types of mobile machines, and the common feature is that the machine works in a mobile way or the machine needs to move during the operation; according to the usage scenarios, mobile machines can be roughly divided into two categories: road and non-road. Road mobile machines are mainly vehicles that run on artificial roads and are used for passenger and cargo transportation. Non-road mobile machines mainly include various mobile construction machinery such as forklifts, excavators, loaders, and cranes, as well as self-propelled agricultural equipment, Military vehicles, etc. During the working process, in addition to moving by itself, non-road mobile machines also need to complete certain specific engineering operations t...

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Problems solved by technology

At present, the commonly used scheme in the design of hydraulic sources of non-road mobile machines is to configure hydraulic pumps to meet the maximum load conditions of the hydraulic actuators that consume the most hydraulic power. The valve components control the hydraulic supply parameters of the hydraulic source to the hydraulic actuators by means of shunting and throttling to complete the corresponding engineering operations. The advantage of this scheme is that it can meet the hydraulic drive power requirements of all hydraulic actuators. The operation can realize fast response and relatively accurate control, but because the diversion process of the valve components usually allows the pressure oil from the diversion to flow back directly to the hydraulic oil tank, resulting in hydraulic power loss, and at the same time, the valve components themselves The hydraulic pressure difference between the front of the valve and the back of the valve also causes a loss of hydraulic power. In addition, the size of the hydraulic power is positively related to the pressure and flow of the oil, and hydraulic actuators generally use linear or rotary hydraulic cylinders as actuators. When working, the operation is completed by supplying pressure oil to the working chamber of the hydraulic cylinder or discharging oil from the working chamber of the hydraulic cylinder. Usually, the oil discharged from the hydraulic cylinder is directly returned to the hydraulic oil tank, because the discharged oil has a certain oil Pressure, so also formed a certain hydraulic power loss

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