Direct-drive hydraulic transmission coal mining machine cutting rotary drum height regulating system and method

Abstract

The invention discloses a direct-drive hydraulic transmission coal mining machine cutting rotary drum height regulating system. The system comprises a variable-frequency control device (4), a servo electric motor (1), a hydraulic pump (2) and a hydraulic motor (3) which are sequentially connected, wherein an output shaft of the hydraulic motor (3) is hinged to a rocker arm (5); the top of the rocker arm (5) is provided with a rotary drum (6); a detection device (7) used for detecting the rotating direction, the rotating speed and torque signals of the rocker arm (5) is also arranged on the rocker arm (5); and the detection device (7) transmits the actual detection value to the variable-frequency control device (4) to be compared with a preset value and to perform feedback control. Meanwhile, the invention also discloses a height regulating method using the system. When the variable-frequency hydraulic system is used, the electric motor drives the hydraulic pump and can directly realize the speed change, direction change and torque change functions of a height regulating mechanism at the same time; a hydraulic loop structure of the system is greatly simplified; meanwhile, the throttle loss in the hydraulic loop is eliminated; and the obvious energy-saving effect is achieved.

Description

technical field [0001] The invention relates to a shearer height adjustment system for a shearer, in particular to a direct-drive hydraulic transmission shearer height adjustment system and method, and belongs to the technical field of mining shearers. Background technique [0002] With the rapid development of coal mining technology and the increasing importance of coal mine safety, it has become an inevitable trend to realize the mining of underground coal mining face with few or no people. The necessary condition is to realize the mechanization and automation of underground coal mining equipment. [0003] The coal shearer is the main coal falling equipment, and its automatic control mainly includes frequency conversion traction and intelligent height adjustment of the cutting drum. Among them, the automatic height adjustment of the cutting drum means that when the shearer is pulling and moving, the front and rear drums need to be automatically adjusted along the coal-rock...

AI Technical Summary

Problems solved by technology

[0005] Usually, the hydraulic system is controlled by the valve of the roller height adjustment mechanism, and its speed change, direction change and torque change are controlled by high-power energy-consuming components such as flow control valves, directional control valves and pressure control valves, and the hydraulic circuit structure of the system is relatively complicated. , there are serious throttling losses in the hydraulic circuit

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