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Comprehensive Mechanized Top Coal Caving Technology-Top Coal Caving Technology
Release time:
2022-12-26
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Comprehensive Mechanized Top Coal Caving Technology-Top Coal Caving Technology
The operation mode of the shearer in the fully mechanized caving face is completely the same as that of the fully mechanized working face.into a fully mechanized mining cycle. According to the difficulty of top coal release, one, two or three heddle can be completed.After the mining cycle, arrange a top coal caving process.
(1) Coal release step.
In the advancing direction of the working face, the distance between the front and back coal caving is called the coal caving step.
It is one of the main factors affecting the recovery rate of top coal and the rate of gangue. Reasonable coal caving step should first make the releaseThe top coal within the scope can be fully broken and loose, and the top coal recovery rate is high and the gangue rate is low. Coal caving stepWhen it is too large, the gangue on the roof will reach the coal caving mouth before the coal behind the goaf, forcing the coal caving mouth to close.Large triangular coal will be left on the goaf side and cannot be released; when the coal caving step is small, the rear gangue is easyMixed into the coal discharge port, it is easy to cause the wrong judgment that the coal has been released and stop the coal discharge. In production practice, when the topWhen the thickness of coal is small, it is usually reasonable to use one mining and one release; when the thickness of top coal is large, it can be appropriately increased.The step distance of coal adopts two mining and one release or three mining and one release.
(2) Coal release sequence.
When the top coal is caving, the coal caving method and sequence of each coal caving port are called the coal caving sequence. PutTop coal work is mostly carried out from the lower part to the upper part (or from the upper part to the lower part), one by one or in turn. 1General top coal caving is completed at one time along the full length of the working face, I .e. one round of caving is completed. if the top coal is thick, two rounds of caving can also be used.Finished. In the process of coal caving, if there is a sign of flake, coal caving should be stopped. When gangue appears at the coal outlet, it shallClose the coal opening.
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