Electro-hydraulic proportional pilot control lifting system of mining dump truck

Abstract

An electro-hydraulic proportional pilot control lifting system of a mining dump truck comprises a hydraulic oil tank, the hydraulic oil tank is connected with a lifting main valve through an oil suction filter, a duplex gear pump and a high-pressure filter, the lifting main valve is connected with a lifting oil cylinder through a balance valve, the lifting main valve is connected with a lifting pilot proportional valve and an emergency unloading valve, and the electro-hydraulic proportional pilot control lifting system further comprises a controller. The input end of the controller is connected with a control handle and an angle sensor. The lifting speed can be continuously adjusted under the constant rotating speed input working condition, the good micro-motion performance is achieved, and the lifting efficiency is improved; according to the pilot control emergency descending device, on the premise that the normal lifting operation function is not affected through manual unauthorized control, a safe emergency unloading device for manually and emergently descending a container when a vehicle has a lifting fault and cannot be unloaded is provided, and the use safety is greatly improved.

Description

technical field [0001] The invention relates to the technical field of a hydraulic lifting system for an electric drive mining dump truck, in particular to an electro-hydraulic proportional pilot control lifting system for a mining dump truck. Background technique [0002] The lifting function is one of the most important functions of the mining dump truck hydraulic system, and the different control forms of the hydraulic system directly affect the operation stability, safety and work efficiency of the lifting and unloading process. The system is mostly composed of customized threaded cartridge valve groups or large-bore multi-way valves with corresponding pilot control valves. The control forms are mostly mechanical control and switch control, because of its simple control; With the improvement of safety requirements and the development trend of unmanned mining vehicles, the electric proportional control form has become a more ideal choice. [0003] The hydraulic lifting s...

AI Technical Summary

Problems solved by technology

Among them, the mechanical control and switch control forms are adopted by most manufacturers because of their easy implementation and simple control, but these two control forms cannot realize the continuous adjustment of the lifting speed under the condition of constant speed input, and cannot meet the customer's micro-movement requirements. , so the lifting efficiency is low; at the same time, the mechanical control form itself cannot realize the limit control of the lifting angle of the cargo box, and an additional control valve group is required to cooperate with the original pilot control valve, which increases the number of components and complicates the system degree and production cost, but also increases the failure rate

With the application of unmanned driving technology in large-scale open-pit mines, unmanned mining vehicles have become a development trend, but the mechanical control lifting system cannot seamlessly connect unmanned control, and requires a large investment of capital and labor costs for transformation. Not suitable for the needs of future mine development

[0004] During the lifting process of mining dump trucks, especially during the full-load lifting process, if the hydraulic system fails, the materials will remain in the container and cannot be unloaded, and at the same time cannot fall back to the frame. At present, most manufacturers do not have a separate emergency unloading control device , once a failure occurs, the excavator needs to cooperate with manual unloading of materials, and then remove the pipeline and use an external device to lower the container. This operation process is complicated, which greatly wastes labor costs and has unsafe factors, which can easily cause injury accidents.

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