Hydraulic excavator power system adopting double-pump direct driving and differential fast forwarding automatic switching
A technology for hydraulic excavators and power systems, applied in mechanical equipment, fluid pressure actuating devices, servo motors, etc., can solve problems such as difficulty in realizing hybrid drive or pure electric drive, loss along the way and local loss, low system efficiency, etc. problems, to achieve the effect of reducing sensor requirements, improving robustness, and improving production efficiency
Active Publication Date: 2018-09-14
FUJIAN UNIV OF TECH
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Problems solved by technology
[0003] The current excavator still uses the drive system of engine-quantitative pump-multi-way valve-actuator. The engine drives the hydraulic pump, and the multi-way valve distributes the hydraulic energy to each actuator. The hydraulic system is based on the principle of open valve control. A lot of energy is consumed on the throttle and overflow, and there are a lot of loss along the process and local loss in the process, that is, the pressure loss caused by the pipeline part and the hydraulic valve, etc.
The hydraulic system efficiency of construction machinery is about 30%. A large amount of hydraulic energy is lost and converted into heat energy to cause system heating. The system efficiency is low, and it is not easy to realize hybrid drive or pure electric drive.
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[0026] see Figure 1 to Figure 7 As shown, the present invention provides a hydraulic excavator power system adopting double-pump direct drive and differential fast-forward automatic switching, including a controller 10 and at least one hydraulic module 20, and the hydraulic module 20 includes a hydraulic cylinder 201, a first A bidirectional quantitative pump 202, a second bidirectional quantitative pump 203, a first control valve 204, a second control valve 205, an accumulator 206, a driver 207 and a drive motor 208;
[0027] The hydraulic cylinder 201 includes a cylinder body 2011, a piston 2012 and a piston rod 2013, one end of the piston rod 2013 is fixedly connected to the piston 2012, and the piston 2012 is airtightly and slidably connected in the cylinder body 2011 , and the piston 2012 divides the interior of the cylinder 2011 into a first chamber 2014 and a second chamber 2015;
[0028] The first bidirectional quantitative pump 202 includes a first drive end 2021, a...
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The invention provides a hydraulic excavator power system adopting double-pump direct driving and differential fast forwarding automatic switching. A controller sends a control instruction to a driverto control the rotation speed of a driving motor, rotation speed control over a first two-way metering pump and a second two-way metering pump which are coaxially connected is achieved, therefore, flow control is achieved, and use of a traditional hydraulic flow control valve is avoided; meanwhile, the driving motor has rotation speed and torque feedback, therefore, the sensor requirement is reduced, differential fast forwarding switching is automatically achieved through a first control valve, the number of elements is decreased, and the robustness of the system is improved.
Description
technical field [0001] The invention relates to the energy-saving technical field of hydraulic excavators, in particular to a hydraulic excavator power system adopting double-pump direct drive and differential fast-forward automatic switching. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution worldwide, energy-saving and emission-reduction technologies are currently a research hotspot. Hydraulic excavator is a kind of construction machinery with relatively high power, but its total utilization rate of energy is low. Energy saving and emission reduction of hydraulic excavators have always been the goal pursued by the industry. Hybrid drive technology and electric drive technology are current research hotspots. [0003] The current excavator still uses the drive system of engine-quantitative pump-multi-way valve-actuator. The engine drives the hydraulic pump, and the multi-way valve distributes the hydraulic e...
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IPC IPC(8): F15B11/17F15B13/06
CPCF15B11/17F15B13/06
Inventor 张树忠练国富唐一文戴福全晏岱陈丙三
Owner FUJIAN UNIV OF TECH