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Fully-electrically-driven hydraulic excavator power system

A hydraulic excavator and power system technology, applied in the direction of earth moving machine/shovel, construction, etc., can solve problems such as zero pollution that cannot be fundamentally solved, and achieve the effects of convenient control, expansion of application scope, and flexible layout of the whole machine

Active Publication Date: 2016-10-12
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing energy-saving methods for hydraulic systems have played an important role in improving efficiency, they still have obvious shortcomings. For example, the use of internal combustion engines as the main power None of the emission reduction methods can fundamentally solve the problem of "zero pollution"

Method used

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  • Fully-electrically-driven hydraulic excavator power system

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Such as figure 1 As shown, an all-electric drive hydraulic excavator power system includes a hydraulic actuator, a bidirectional quantitative pump 2, a servo motor 1, a low-voltage accumulator 4, a frequency converter, a controller, and a clutch controller.

[0018] The hydraulic actuators include the first and second switching valve groups 7, 8, hydraulic check valve 3, the first and second travel motors 9, 10, stick symmetrical cylinder 11, bucket symmetrical cylinder 12, boom symmetrical cylinder 6, Swing motor 5 etc.

[0019] The clutch controller receives the power supply signal in plug-in mode or battery mode. The controller receives the signal input by the driver through the handle to control the speed of each hydraulic actuator, and calculates the control signal of each hydraulic actuator, and then transmits it to the frequency converter...

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Abstract

The invention relates to a fully-electrically-driven hydraulic excavator power system. The fully-electrically-driven hydraulic excavator power system comprises hydraulic execution components, two-way constant-displacement pumps, servo motors, a frequency converter, a controller and a clutch controller, wherein the clutch controller is used for receiving power supply signals of a plug-in mode or a battery mode; the controller is used for receiving signals input by a driver via a handle and used for controlling speed of each hydraulic execution component, calculating control signals of each hydraulic execution component and transmitting the signals to the frequency converter; and the frequency converter is used for taking electricity from the plug-in mode or the battery mode via the clutch controller, converting the electricity into voltage of each servo motor connected to the frequency converter, controlling size and direction of rotation speed of each servo motor, controlling size and direction of output flow of the two-way constant-displacement pumps connected to the frequency converter and finally controlling the speed of each hydraulic execution component. Through the fully-electrically-driven hydraulic excavator power system, internal combustion engines which are widely used at present are eliminated; the advantage of high power of a hydraulic system is exerted; and through adoption of a volume control mode, the effective combination of energy conservation and emission reduction is achieved.

Description

technical field [0001] The invention relates to an excavator power system, in particular to a power system of an all-electrically driven hydraulic excavator. Background technique [0002] In recent years, under the background of energy shortage and increasing environmental pollution, research on energy saving and emission reduction of hydraulic systems, which generally have the disadvantages of low efficiency and poor emissions, has become a hot spot. Although the existing energy-saving methods for hydraulic systems have played an important role in improving efficiency, they still have obvious shortcomings. For example, the use of internal combustion engines as the main power None of the emission reduction methods can fundamentally solve the problem of "zero pollution". At the same time, with the diversity of power generation methods and high efficiency of power generation, as well as the zero-pollution advantages of the power system, if the electric technology is integrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20E02F9/22
CPCE02F9/207E02F9/2264
Inventor 沈伟庞宇麦云飞
Owner UNIV OF SHANGHAI FOR SCI & TECH
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