Heavy dump truck hydraulic system and control method thereof

Abstract

The invention discloses a heavy dump truck hydraulic system which comprises a centralized control valve provided with an oil inlet P, an oil supply port CF and an oil supply port EF, a main pump oil outlet is connected to the oil inlet of the centralized control valve, the oil supply port CF is connected to a first steering unit to supply oil, the oil supply port EF supplies oil to a supporting unit and a lifting unit, and a double pump comprises a first pump and a second pump. The first pump is connected with the second steering unit to supply oil, the second pump is connected to an oil inlet of the two-position two-way valve, the two-position two-way valve is provided with an oil port A1 and an oil port B1, the oil port A1 is connected with an oil inlet of the centralized control valve, and the oil port B1 supplies oil to the supporting unit and the lifting unit, the main pump and the double pump receive ECU signals to control opening and closing, and the two-position two-way valve receives the ECU signals to control the switching access. When the main pump breaks down, the double pump is started, the two-position two-way valve is switched to the position A1, oil supply continues, and potential safety hazards are avoided; when the first steering unit breaks down, the double pump is started, the two-position two-way valve is switched to the A2 position, oil supply continues, and potential safety hazards are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to a hydraulic system of a heavy dump truck and a control method thereof. Background technique [0002] Heavy-duty dump trucks refer to vehicles that unload goods by themselves through hydraulic or mechanical lifting. It is composed of chassis, hydraulic lifting mechanism, steering system, cargo compartment and other components. In civil engineering and ore mining, heavy-duty dump trucks are often combined with construction machinery such as excavators, loaders, and belt conveyors to form a loading, transporting, and unloading production line for loading and unloading of earthwork, sand, and bulk materials. As a commonly used loading vehicle, when it is heavily loaded, it often encounters steering failure. During the unloading process, the lifting power suddenly loses, which causes huge economic losses, and even serious accidents such as vehicle crashes. Therefore, a T...

AI Technical Summary

Problems solved by technology

[0006] 3. There is no intelligent control system in the existing heavy-duty dump trucks, and operations such as intelligent steering and intelligent lifting cannot be realized;

[0007] 4. The existing emergency steering uses the accumulator to continue to store the oil. When the power fails, the energy is released briefly to ensure the steering. However, the effective steering time of this scheme is short (usually 10S, determined according to the size of the accumulator), and it cannot Solve the lifting problem, no support and other auxiliary actions

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