Loader variable multi-stage power control module and hydraulic system

Abstract

The invention discloses a loader variable multi-stage power control module which comprises a first shuttle valve set, a second shuttle valve set, a reversing valve and a variable pump LS pressure control valve. The first shuttle valve set transmits pilot oil pressure to the hydraulic operated reversing valve through an opening X5 and an opening X6. An opening X4 of the second shuttle valve set is connected with pilot control pressure, and the second shuttle valve set outputs the maximum value in pilot pressure oil of the opening X5, the opening X6 and the opening X4 through an opening X7. A pressure control valve communicates with a pump opening LS through a hydraulic operated reversing valve opening LS2. An opening T of the variable pump LS pressure control valve is connected with an oil tank. The invention further discloses a loader variable multi-stage power control hydraulic system with the multi-stage power control module. According to different execution mechanisms of the work hydraulic system, the pressure corresponding to the work hydraulic system is set, that is, different variable pump LS overflow pressures are set, the torque consumed by the whole hydraulic system is adjusted in good time, and then the effect of high efficiency and energy saving of the whole machine is achieved.

Description

technical field [0001] The invention relates to a loader hydraulic system, in particular to a loader variable multi-stage power control module and a hydraulic system. Background technique [0002] At present, the variable hydraulic system of the loader, the working pressure of the variable pump is set by the host manufacturer when it leaves the factory, that is, the working pressure is constant, that is, the maximum power consumed by the hydraulic system is a fixed value, in order to meet the requirements of different working conditions, the hydraulic pressure The factory pressure setting of the system is generally high. With the continuous enrichment of the hydraulic system of the attachments of the loader (for example: wood grabber, grass grabber, sweeper, forklift, etc.), the operating conditions and working areas of the loader are becoming more and more complex. more expansive. [0003] Due to the large difference in the working pressure required by different attachment...

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Problems solved by technology

[0003] Due to the large difference in the working pressure required by different attachments, after all the working pressures are uniformly set by the manufacturer, when some low-pressure attachment hydraulic systems are used in conjunction with high-pressure attachment hydraulic systems, high-pressure resistant hydraulic components must be used ( Hydraulic cylinders, valve components, etc.), auxiliary components (hydraulic pipelines, accumulators, etc.), resulting in unnecessary waste of design and selection, and high pressure will cause waste of engine power and heat generation of the whole machine system

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