Proportional control system applied to height adjustment of coal mining machine

Abstract

The invention belongs to the technical field of height adjustment of coal mining machines, and provides a proportional control system applied to height adjustment of a coal mining machine for improving the height adjustment precision of the coal mining machine and realizing intelligent shape cutting. The proportional control system comprises a control center, a proportional controller, a proportional valve bank, a rotary encoder and a travel sensor, wherein the rotary encoder is arranged on a rocker arm of the coal mining machine; the travel sensor is connected with a telescopic cylinder of the rocker arm of the coal mining machine; the rotary encoder and the travel sensor are connected with the control center; the proportional valve bank is connected with the telescopic cylinder of the rocker arm of the coal mining machine; the control center drives the proportional controller; and the proportional controller controls the proportional valve bank. According to the proportional control system, a proportional reversing valve and a PID (Proportion Integration Differentiation) controller substitute a switching value valve bank, and the rotary encoder substitutes a cylinder travel sensor to serve a sensing device, so that the final whole height adjustment effect meets the precision requirements of various functions of intelligent coal mining machines by simultaneously improving the precision of the controller and the sensor.

Description

technical field [0001] The invention belongs to the technical field of height adjustment of coal shearers, and in particular relates to a proportional control system applied to height adjustment of coal shearers. Background technique [0002] At present, there are two solutions to solve the height adjustment function of the shearer: [0003] A. Open-loop height adjustment system controlled by switch: [0004] This scheme is the height adjustment scheme of the traditional coal shearer - the executive device to control the height adjustment cylinder of the coal shearer selects the switch volume electro-hydraulic valve, and the electric control system gives a fixed electric signal to drive it to open or close. The height adjustment of the rocker arm is realized through the expansion and contraction of the oil cylinder. There is no quantitative control target in this program, everything is subject to manual experience. [0005] B. Closed-loop height adjustment system controll...

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Problems solved by technology

[0009] Although Plan B introduces the cylinder stroke sensor and closed-loop control system in order to realize the precise control of the rocker arm, but because the control device is a switch electro-hydraulic valve group, it can only rely on a fixed speed to approach the target height, resulting in insufficient accuracy. And various problems such as repeatedly adjusting up and down around the target value, and finally unable to enter a stable height, the overall control effect is not ideal, objectively making intelligent functions such as memory cutting impossible to achieve

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