Method for identifying coal petrography interface of thin coal layer and automatically heightening expansion cylinder

Abstract

The invention provides a method for identifying a coal petrography interface of a thin coal layer and automatically heightening an expansion cylinder. A current sensor is arranged on a slicing motor of a coal cutter. The method comprises the following step of: (1) firstly cutting for once to be taken as demonstration cutting by the slicing motor of the coal cutter, and recording the respective current value condition when the coal seam and the rock stratum are cut by the coal cutter, wherein the current value is taken as a coal seam / rock stratum current limiting value; (2) enabling a rocker arm of a front expansion cylinder to upwards swing automatically after the coal cutter is used for cutting, and enabling a back expansion cylinder of the coal cutter to downwards swing, identifying the coal petrography layer by detecting a current fluctuation range, and automatically adjusting the mining height according to the different current limiting values of the coal seam and the rock stratum; and (3) judging by the means that the current data generated when the coal petrography is cut by the coal cutter and recoded in the process of coal cutting by the demonstration cutting are taken as the standard value. Under the condition that the coal petrography interface is identified, the coal cutter can be used for automatically adjusting the mining height according to the thickness of the coal, so that the recovery ratio can be improved.

Description

technical field [0001] The invention relates to a thin coal seam coal-rock interface recognition method and a drum automatic height adjustment method, which belongs to the field of coal rock interface recognition and drum automatic height adjustment. Background technique [0002] In recent years, as the country and the industry have attached great importance to the automatic mining of thin coal seams, some enterprises have increased their research efforts on thin coal seam mining technology, and have carried out fruitful attempts and tests. When the conditions of the roof and floor are good, operations such as the automatic frame shifting of the bracket following the shearer and the pushing of the scraper conveyor have been basically realized, while various adjustments of the shearer still require manual intervention. Even with this level of automated operations, it is impossible to achieve normalized operations, only part-time operations. One of the key factors that needs ...

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Problems solved by technology

But using preset values ​​is not a thin seam practical approach

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