Hydraulic control system of full-hydraulic drill type coal miner

Abstract

The invention discloses a hydraulic control system of a full-hydraulic drill type coal miner. The hydraulic control system comprises a drill system, a walking system, a propelling system and an auxiliary system. The drill system is controlled in a closed-loop manner by a load sensitive variable pump and an electro-hydraulic proportional valve, the pressure and the flow of the drill system can be automatically adjusted according to load changes; and the drilling speed and the position of a drill rod can be controlled in real time. The walking system and the drill system share one dual variable axial piston pump, and the complexity and space of the walking system can be effectively reduced; a speed regulating valve is adopted in the propelling system to adjust the speed, the propelling speed is adjusted according to the working condition, and cutting of a drill machine under the maximum power is achieved; and the auxiliary system can complete supporting and slope adjustment of a working platform of the drill machine, conveying and clamping of the drill rod and adjustment of the working angle of the drill machine, and positioning of the drill rod in the process of drill rod changing is completed. The problems that a hydraulic system of an existing hydraulic drill type coal miner is complex in oil way, the drill rod is difficultly controlled precisely, the system efficiency is low, and auxiliary work time and drill rod changing time are long are solved.

Description

technical field [0001] The invention relates to a mining equipment hydraulic control system, in particular to a fully hydraulic drilling shearer hydraulic control system suitable for thin and extremely thin coal seam mining equipment. Background technique [0002] my country's thin and extremely thin coal seam reserves are abundant and widely distributed. With the large-scale mining of medium-thick coal seams, the mining of thin and thin coal seams has become an urgent problem to be solved. At present, the degree of mechanization of thin and extremely thin coal seam mining is relatively low, and drilling shearers are widely used due to their advantages such as low body and high power. Docking, and it needs to be adjusted by a fine-tuning mechanism composed of a ratchet and a hydraulic cylinder to complete the docking of the drill pipe. The control accuracy is low, and the time for loading and unloading the drill pipe is long, which greatly reduces the coal mining efficiency....

AI Technical Summary

Problems solved by technology

At present, the degree of mechanization of thin and extremely thin coal seam mining is relatively low, and drilling shearers are widely used due to their advantages such as low body and high power. Docking, and the adjustment of the fine-tuning mechanism composed of a ratchet and a hydraulic cylinder is required to complete the docking of the drill pipe. The control accuracy is low, and the time for loading and unloading the drill pipe is long, which greatly reduces the coal mining efficiency.

In addition, the hydraulic system uses a quantitative pump to supply oil, and the hydraulic circuits are not synchronized due to the influence of external load changes during the working process of the drilling rig, and cannot work under optimal parameters.

There are multiple speed regulating valves and overflow valves in the hydraulic system, the system has large power loss, severe heat generation and low reliability

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