A temperature rise control system and control method of a dump truck hydraulic system
The technology of a hydraulic system and a control system is applied to the temperature rise control system and control field of the hydraulic system of a dump truck, and can solve the problems of poor cleanliness, affecting the working performance and service life of the hydraulic system, and wear of the oil pump.
Active Publication Date: 2020-03-03
GUANGZHOU ELECTRICAL LOCOMOTIVE
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Problems solved by technology
Excessive oil temperature will bring a series of problems, such as the reduction of the volumetric efficiency of the hydraulic system, the deterioration of hydraulic oil, the deterioration of cleanliness, the fluctuation of system pressure, the wear of the oil pump, the aging of hydraulic hoses and seals, the leakage of oil inside and outside the cylinder, the hydraulic pressure The valve is stuck, the brake cannot be released normally, etc., which seriously affect the working performance and service life of the hydraulic system
Excessive oil temperature will also cause personal safety accidents caused by burns during use and maintenance, which needs to be paid attention to
Method used
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Embodiment Construction
[0025] Depend on figure 1 shown. The present invention includes a first quantitative pump 1, a second quantitative pump 2, a first filter 3, a second filter 4, a first unloading valve 5, a second unloading valve 6, a first one-way valve 7, a first Two one-way valves 8, the third one-way valve 9, a stop valve 10, a solenoid valve 11, an accumulator 12 and a pressure sensor 13, the first quantitative pump and the second quantitative pump are jointly connected to a driving motor and form a double One end of the first quantitative pump 1 and the second quantitative pump 2 is connected with the oil tank 14 of the dump truck, and the other end of the first quantitative pump 1 is connected with the first unloading valve 5 and the first filter respectively. 3 connection, the other end of the second quantitative pump 2 is respectively connected with the second unloading valve 6 and the second filter 4, the first unloading valve 5 forms a first circuit with the fuel tank 14 of the dump...
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The invention relates to a temperature rise control system of a dump truck hydraulic system. The temperature rise control system of the dump truck hydraulic system comprises a first constant displacement pump, a second constant displacement pump, a first filter, a second filter, a first unloading valve, a second unloading valve, a first one-way valve, a second one-way valve, a third one-way valve,a stop valve, an electromagnetic valve, an energy accumulator and a pressure sensor. As a typical clearance working mode is adopted in an electric drive dump truck, lifting, steering and braking areall clearance working, and non-working time including parking idle time is much larger than working time. An electric unloading control mode is adopted, so that the constant displacement pumps are ina zero piezoelectric unloading state under non-lifting and non-steering and non-braking working conditions, so that calorific value is greatly reduced, temperature rise of the hydraulic system is inhibited, energy is saved, consumption is reduced, and the performance and service life of the hydraulic system are ensured.
Description
technical field [0001] The invention relates to the field of dump truck hydraulic systems, in particular to a temperature rise control system and a control method of the dump truck hydraulic system. Background technique [0002] As a mining engineering vehicle used in off-highway areas with high production efficiency and low operating costs, the electric drive dump truck adopts a hydraulic control system for its lifting, steering and braking. [0003] The hydraulic control system of the electric drive dump truck mainly includes a constant pump hydraulic system and a load sensing variable pump hydraulic system. Quantitative pump hydraulic system is low in cost, and the oil pump can be provided domestically. However, since the quantitative pump is always in the full displacement working state, part of the flow drives the load, and the rest of the flow bypasses the oil. Because the relief valve always maintains the highest pressure of the system, resulting in relatively Heat d...
Claims
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IPC IPC(8): F15B21/00F15B1/02B60P1/16
CPCB60P1/162F15B1/022F15B21/00F15B2211/20576F15B2211/212F15B2211/66
Inventor 张义亮罗恒贤
Owner GUANGZHOU ELECTRICAL LOCOMOTIVE