Excavator hydraulic system with energy feedback function
A technology of energy feedback and hydraulic system, which is applied in the direction of mechanically driven excavators/dredgers, etc., can solve the problems of loss, throttling, speed regulation control, consumption, and difficulty in improving efficiency, and achieves the effect of strong versatility
Inactive Publication Date: 2017-08-04
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
The rest is consumed in every link from the hydraulic transmission system to the load, about 38% is lost in the hydraulic components, 20% is lost in the movement of the vehicle body and operating devices, and about 20% is lost in throttling and speed control
Among them, the energy-saving technology of hydraulic components such as pumps, motors, cylinders and valves has reached a certain level, and it is difficult to further improve efficiency.
Method used
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[0025] The useless energy consumption of the boom cylinder and the swing motor is very large, and the energy saving is the most significant. The working process of the boom cylinder and the swing motor is used as an example to illustrate how the module works.
[0026] (1) When the hydraulic system of the excavator needs energy recovery, install sub-module I, sub-module II, accumulator 20, and check valve 39 according to the diagram.
[0027] (2) When the boom cylinder is working, if the boom feeds oil into the large cavity and the boom lifts heavy objects, the energy consumed can be regarded as effective energy. When oil enters the small cavity, the boom is lowered. At this time, the boom has huge potential energy under the action of heavy objects or external loads. The lowering of the boom does work on the piston rod and accelerates the movement of the boom. A throttle valve is installed on the oil circuit, and the corresponding signal is sent out through the controller, and ...
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The invention discloses an excavator hydraulic system with energy feedback function, which comprises a main pump of the system, main actuators: travel motor, swing motor, boom cylinder, arm cylinder, bucket cylinder and corresponding actuators for controlling the actuators. Action multi-way valve. The hydraulic system is connected to the energy feedback module, and the energy feedback module includes two sub-modules, sub-module I and sub-module II; the present invention is aimed at the hydraulic system, especially for the control of the movement of the vehicle body and the working device, throttling and speed regulation. A hydraulic device, as a module, can be installed to an excavator system and be independent from the excavator system to form an independent energy feedback operation mode. The mode can automatically adjust the working point according to the load and speed requirements of the load, recover useless energy to the maximum extent, and automatically feed back to the hydraulic system. The module has strong versatility.
Description
technical field [0001] The invention relates to engineering machinery, in particular to the energy recovery technology of a hydraulic excavator. Background technique [0002] Excavator is an important type of construction machinery and is widely used in national construction projects. Excavators generally use diesel engines as primary power, and drive actuators to travel through hydraulic systems. Ordinary excavators are cycle-operating machines with variable load conditions, long working hours, heavy workloads, and consume a lot of energy, but their energy efficiency is very low. [0003] The hydraulic system of different manufacturers and models of excavators is changeable. No matter how the hydraulic system of the excavator changes, the main actuators of the hydraulic system are composed of travel motors, swing motors, boom cylinders, stick cylinders and bucket cylinders. . by figure 1 Take the hydraulic system as an example to illustrate how the present invention real...
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IPC IPC(8): E02F3/42
Inventor 吴文海于兰英邓斌柯坚刘桓龙
Owner SOUTHWEST JIAOTONG UNIV