An energy-saving heavy-duty dump truck with lifting protection and its hydraulic control system

Abstract

The invention discloses an energy-saving heavy-duty dump truck with lifting protection and its hydraulic control system. There is a lifting oil cylinder, and the top surface of the end away from the front is provided with a support rod, the bottom end of the support rod is hinged with the frame, the side of the support rod is provided with a first control rod, a second control rod and a guide rod, and there are double-headed rods in the frame. Oil cylinder, a first pull wire is provided between the output end of the double-headed oil cylinder far away from the support rod and the first control rod, and a second pull wire is connected to the output end of the double-head oil cylinder near the support rod, and the second pull wire passes through the guide rod and the second Joystick connection. When lifting, the present invention controls the action of the first pull wire and the second pull wire by the double-headed oil cylinder to realize the lifting of the support rod, and supports the maintenance of the carriage after lifting, effectively avoiding the potential safety hazard of the fall of the carriage; when the lift cylinder is lifted to the limit position Push the piston rod of the limit valve in time to cut off the oil inlet, avoid excessive lifting, avoid hydraulic pressure shock and improve the life of the oil cylinder and structural stability.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to an energy-saving heavy-duty dump truck with lift protection and a hydraulic control system 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. Because the loading box can automatically tip over to unload at a certain angle, it greatly saves unloading time and labor, shortens the transportation cycle, improves production efficiency, and reduces transportation costs. It is a commo...

AI Technical Summary

Problems solved by technology

[0005] 2. Due to the different hydraulic requirements for the steering and lifting operations of the existing heavy-duty dump trucks, a dual-pump dual-hydraulic system is adopted. The steering and lifting operations are realized by two pumps with different displacements and two independent hydraulic systems. , leading to higher cost and complicated control;

[0006] 3. The lifting cylinder of the existing heavy-duty dump truck adopts mechanical limit, and there is no hydraulic limit control mechanism, which leads to excessive lifting of the lifting cylinder, which especially affects the life of the cylinder and the structural stability;

[0007] 4. The steering system of existing heavy-duty dump trucks is controlled by a quantitative pump, and the output power of the pump is fixed. However, the road conditions are complex, and the power required by the steering system is relatively variable. Therefore, in order to meet the requirements of the steering system, the output power of the pump must be kept in excess. Lead to high energy waste, which does not meet the requirements of energy saving and emission reduction;

[0008] 5. Existing heavy-duty dump trucks have the problems of heavy steering, laborious operation of the steering wheel, easy deformation and damage of the steering oil cylinder, easy deformation and damage of the steering gear pump, easy contamination of the oil, and high oil temperature during the large-scale loading and transportation of the existing heavy-duty dump trucks.

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