Full flow electrohydraulic control system for construction machinery gear box

Abstract

The invention relates to a construction machinery dynamic power shifting gear box, in particular to a full flow electrohydraulic control system for the construction machinery dynamic power shifting gear box. The system comprises an electric apparatus control part and a hydraulic control part, wherein the electric apparatus control part mainly comprises a gear box controlling handle, a computer control box, a revolution speed transducer and a wiring harness; the hydraulic control part comprises a speed variable pump, a filter cleaner and a full flow electrohydraulic control valve; a plug-in hydraulic cushion valve is arranged at an oil path inlet of a clutch in an independent plug-in mode; a latest full flow switch electromagnetic valve technique and the plug-in hydraulic cushion valve are adopted, and a full flow switch electromagnetic valve and the plug-in hydraulic cushion valve are applied to the electrohydraulic control system of the construction machinery dynamic power shifting gear box, thus the structure of the electrohydraulic control valve is optimized, and the manufacturing difficulty and the manufacturing cost of the electrohydraulic control valve are reduced; and the system can achieve automatic and semi-automatic gear shifting for the gear box through a PLC control unit.

Description

technical field [0001] The invention relates to a construction machinery power shift gearbox, in particular to an engineering machinery power shift gearbox full flow electro-hydraulic control system. Background technique [0002] In the construction machinery industry, the electro-hydraulic control system of power shift transmission of construction machinery can be generally divided into electro-hydraulic pilot control system, electro-hydraulic proportional pilot control system and full-flow electro-hydraulic control system according to the principle of electro-hydraulic control. At present, the electro-hydraulic pilot control method is widely used in power shift transmissions of construction machinery at home and abroad. The electro-hydraulic pilot control valve of the electro-hydraulic pilot control system is mainly composed of: valve body, main pressure regulating valve, pilot oil pressure reducing valve, switch solenoid valve, shift valve, pressure control valve, etc. F...

AI Technical Summary

Problems solved by technology

[0003] The structure of the pilot control valve of the existing electro-hydraulic and electro-hydraulic pilot control system is complex, and the processing and manufacturing requirements are extremely high; at the same time, the complex structure and the use of a large number of components lead to increased system costs and maintenance costs.

And these deficiencies have become the bottleneck of its mass production, limiting its promotion and popularization in construction machinery power shift gearboxes with low cost and price advantage

Images