Articulated truck lifting hydraulic efficiency pressure system interflow fuel-feed system
Technical field
The utility model relates to a kind of hydraulic system of engineering vehicle, specifically is a kind of articulated truck lifting hydraulic efficiency pressure system interflow fuel-feed system.
Background technology
At present, articulated truck hydraulic efficiency pressure system both domestic and external generally adopts and is respectively steering swivel system and hoisting system fuel system, because the required flow of steering swivel system is less, and the required flow of hoisting system is very big, so the lifting capacity of pump is bigger, cause element individual big, pipeline is thick, is not easy to pipeline and space and arranges; As adopt two little displacement pump duplexs to form, and then can cause element and pipeline quantity many, also be not easy to the space and arrange.Because dumping car can not turn in the lifting working process simultaneously, the lifting hydraulic efficiency pressure system can adopt and steering swivel system interflow fuel system.The part mine truck has adopted the mode that turns to lifting interflow fuel feeding at present, but the steering swivel system of mine truck is generally constant-pressure variable control, the steering swivel system of articulated truck then mostly is load-sensitive control, so its fuel system of collaborating with lifting is different from the ore deposit card.
Summary of the invention
Problem at above-mentioned prior art existence, the utility model provides a kind of articulated truck lifting hydraulic efficiency pressure system interflow fuel-feed system, makes the lifting pump capacity needn't be very big, and control is simple, both realized and the hoisting system interflow, also do not influenced the energy-conservation of steering swivel system.
To achieve these goals, a kind of articulated truck lifting of the utility model hydraulic efficiency pressure system interflow fuel-feed system, comprise hydraulic reservoir, load-sensitive Variable plunger pump, two-bit triplet solenoid directional control valve, steering control valve group, sequence valve, electromagnetic switch valve, hoist control valve group and gear type pump, the load-sensitive Variable plunger pump is the steering oil oil supply cylinder by the steering control valve group, and gear type pump is the elevating ram fuel feeding by the hoist control valve group; The two-bit triplet solenoid directional control valve is connected with the load-transducing mouth of steering control valve group, load-transducing mouth LS mouth and the oil outlet P mouth of load-sensitive Variable plunger pump respectively; Sequence valve is connected with the hoist control valve group with the steering control valve group respectively; Electromagnetic switch valve is connected with hydraulic reservoir with the control port of sequence valve respectively.
Interflow of the present utility model fuel-feed system makes the lifting pump capacity needn't be very big, saves the space, is convenient to the control of pipeline, and control is simple, turns to oil sources to become a constant-pressure variable oil sources during lifting and collaborates to finish with the lifting oil sources, has reduced the lifting pump capacity; And after the lifting end, turn to oil sources still to revert to load-sensitive variable oil sources, and both realized and the hoisting system interflow, do not influence the energy-conservation of steering swivel system yet.
Description of drawings
Fig. 1 is the utility model functional block diagram.
Among the figure: 1, hydraulic reservoir, 2, the load-sensitive Variable plunger pump, 3, the two-bit triplet solenoid directional control valve, 4, the steering control valve group, 5, sequence valve, 6, electromagnetic switch valve, 7, the hoist control valve group, 8, gear type pump.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model articulated truck lifting hydraulic efficiency pressure system interflow fuel-feed system, comprise hydraulic reservoir 1, load-sensitive Variable plunger pump 2, two-bit triplet solenoid directional control valve 3, steering control valve group 4, sequence valve 5, electromagnetic switch valve 6, hoist control valve group 7 and gear type pump 8, load-sensitive Variable plunger pump 2 is the steering oil oil supply cylinder by steering control valve group 4, and gear type pump 8 is the elevating ram fuel feeding by hoist control valve group 7; Two-bit triplet solenoid directional control valve 3 is connected with the load-transducing mouth of steering control valve group 4, load-transducing mouth LS mouth and the oil outlet P mouth of load-sensitive Variable plunger pump 2 respectively; Sequence valve 5 is connected with hoist control valve group 7 with steering control valve group 4 respectively; Electromagnetic switch valve 6 is connected with hydraulic reservoir 1 with the control port of sequence valve 5 respectively.S is the oil suction of load-sensitive Variable plunger pump 2, and T is the leakage hydraulic fluid port of load-sensitive Variable plunger pump 2.
The turning to of articulated truck, lifting action be independently, and when lifting was moved, the electromagnet y1 of electromagnetic switch valve 6 and the electromagnet y2 of two-bit triplet solenoid directional control valve 3 were simultaneously; Thereby electromagnetic switch valve 6 and sequence valve 5 are opened, the load feedback signal that the load-transducing mouth LS mouth of load-sensitive Variable plunger pump 2 obtains then switches to the delivery pressure of itself from steering swivel system, this moment load-sensitive Variable plunger pump 2 quite with constant-pressure variable pumping actions, be the hoisting system pressure oil output by sequence valve 5, realize that with gear type pump 8 be the hoisting system fuel feeding jointly.After the lifting release, the electromagnet y1 of electromagnetic switch valve 6 and the electromagnet y2 of two-bit triplet solenoid directional control valve 3 cut off the power supply simultaneously; The load feedback signal that the load-transducing mouth LS mouth of load-sensitive Variable plunger pump 2 obtains reverts to the load signal of steering swivel system, will export its required flow and pressure according to the needs of steering swivel system.