Fixed variable hydraulic system of mining dump truck

Abstract

The invention relates to a fixed delivery and variable delivery hydraulic system of a mining dump truck. A hydraulic steering system in the fixed delivery and variable delivery hydraulic system of the mining dump truck comprises a steering oil cylinder, a load-sensitive variable pump, a steering gear, a signal control valve, a shuttle valve and a flow control valve, wherein the steering gear is connected with the steering oil cylinder. A control oil path of a pilot valve is simultaneously communicated with a signal port P1 of the signal control valve and a left end signal port of the flow control valve. A left position oil outlet of the flow control valve is in one-way communication with a port P of a hydraulic control lift valve through a check valve, a right position oil outlet of the flow control valve is connected with a port P of the steering gear, and an oil inlet of the flow control valve is connected with the pump opening of the load-sensitive variable pump. The pump opening of the load-sensitive variable pump is connected with a port P2 of the signal control valve, a port P3 of the signal control valve is connected with a valve LS in the load-sensitive variable pump, and a port LS of the signal control valve is connected with a port LS of the steering gear. The fixed delivery and variable delivery hydraulic system of the mining dump truck is stable in working and simple in structure, and reduces energy consumption.

Description

technical field [0001] The invention relates to a mine dump truck hydraulic system, in particular to a mine dump truck constant variable hydraulic system. Background technique [0002] Mining dump truck is a heavy-duty truck used to complete ore transportation tasks in open-pit mines. It is characterized by short transportation distances and strong carrying capacity. Excavation yards and unloading yards are widely used in metallurgy, non-ferrous metals, chemicals, coal and other earthwork transportation industries. Mining dump trucks are mainly composed of power system, transmission system, frame, cargo box, suspension system, steering system, hydraulic system, braking system, electrical system and covering parts. At present, the tonnage of mining dump trucks ranges from 20 tons Generally, the tonnage of mine trucks used in mines is in line with its output. For small mines with an annual output of one million tons, 25-50 tons of vehicles are used; for mines with an annual o...

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Problems solved by technology

[0007] (2) For the use of such as figure 2 In the hydraulic system shown, although the priority valve is cancelled, the stability of the steering system is not guaranteed, and during the steering operation, all the flow of the steering pump enters the steering system, and the amount of oil entering the steering cylinder is determined by the engine speed , the higher the speed, the greater the flow rate, which makes the steering erratic, and all the excess flow of the steering pump flows back to the oil tank through the high-pressure overflow of the steering relief valve, causing serious energy loss, and frequent opening of the relief valve will seriously affect the life of the components

This hydraulic system requires both the steering pump and the lifting pump to have sufficient displacement to ensure the normal operation of the machine. The steering pump is only put into work during the steering process, and the steering pump is not used in the lifting condition. In the working condition, only the lift pump is working, and the displacement of the lift pump is relatively large, and the median energy loss is serious

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