Electromagnetic unloading valve and loader dual-pump combined hydraulic system
A hydraulic system and dual-pump confluence technology, applied in mechanical equipment, fluid pressure actuating devices, servo motors, etc., can solve the problem that the power of the hydraulic system cannot well match various working conditions, and achieve increased traction and accelerated The effect of improving speed and energy saving efficiency
Active Publication Date: 2020-02-25
GUANGXI LIUGONG MASCH CO LTD
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide an electromagnetic unloading valve and loader dual Pump confluence hydraulic system
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[0016] The specific implementation will be described below in conjunction with the accompanying drawings.
[0017] Such as figure 2 As shown, the dual-pump combined hydraulic system of the loader includes a hydraulic oil tank 1, a steering pump 2, a priority valve 3, a working pump 5, a working device hydraulic system 7, a steering hydraulic system 6, an electromagnetic unloading valve 4 and a mode selection device. The steering hydraulic system includes the steering gear and the steering cylinder connected with the steering gear; the hydraulic system of the working device includes the distribution valve, the bucket cylinder and the boom cylinder connected with the distribution valve, and the pilot valve connected with the distribution valve to control the connection of the distribution valve Wait.
[0018] The oil inlet P port of the priority valve 3 is connected with the oil outlet port of the steering pump, the CF port and the LS port of the priority valve 3 are connected...
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The invention relates to a loader hydraulic system and provides an electromagnetic unloading valve to solve the problem that hydraulic system power of an existing double-pump converging hydraulic system provided with an unloading valve cannot be well matched with various operation working conditions. The electromagnetic unloading valve is provided with an oil input opening P, an oil output openingA and an overflowing opening T and comprises an electric proportional overflow valve and a one-way valve. The one-way valve is connected between the oil input opening P and the oil output opening A and conducted in a one-way manner in the direction of the oil output opening A. An oil inlet of the electric proportional overflow valve communicates with the oil input opening P. The liquid control end of the electric proportional overflow valve is connected between the one-way valve and the oil output opening A. An oil outlet of the electric proportional overflow valve communicates with an oil return opening T. In the electromagnetic unloading valve, unloading pressure of the electric proportional overflow valve is adjusted by adjusting currents loaded on the electric control end of the electric proportional overflow valve, for the different operation working conditions, the operation efficiency and the operation ability of a loader are changed, and the energy-saving effect is more remarkable.
Description
technical field [0001] The invention relates to a hydraulic component, more specifically, to an electromagnetic unloading valve and a double-pump converging hydraulic system of a loader. Background technique [0002] At present, the double-pump combined hydraulic system is widely used in wheel loaders, in which the unloading valve sets a fixed unloading pressure value, when the hydraulic system pressure is lower than this value, both pumps in the hydraulic system are working The hydraulic system supplies oil; when the system pressure is higher than this value, the unloading valve is opened, and one pump is directly connected to the oil tank. At this time, only one pump supplies oil to the working hydraulic system. Due to the inherent characteristics of the working device mechanism of the loader, when the weight in the bucket is constant, the higher the lifting height of the boom, the greater the pressure required. Therefore, in order to meet the working conditions of full-sp...
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IPC IPC(8): F15B11/17F15B13/02
CPCF15B11/17F15B13/02F15B13/024
Inventor 孟令飞朱长寿莫雄超
Owner GUANGXI LIUGONG MASCH CO LTD