Method for quickly lifting bottom on soft bottom combined mining working surface with large inclination angle

Abstract

The invention discloses a method for quickly lifting a bottom on a soft bottom combined mining working face with a large inclination angle. The method comprises the following steps: every adjacent three hydraulic supports among the hydraulic supports which are in bottom broken and bottom drilling are set into a group, a front beam of a single hydraulic support in each group is connected with a scraper plate corresponding to a scraper conveyer through an anchor chain, and a simple lifting device is formed; the front beams of the three hydraulic supports in the group can be slowly and simultaneously lifted, and the scraper plate can be subjected to the lifting by virtue of a hydraulic system of the working face and enough motive power of the hydraulic supports; when the scraper plate is lifted, a sleeper can be quickly padded to the bottom part of the lifted scraper plate along the direction vertical to the scraper conveyer; the sleeper is in normal advancing along with the working face, the steps can be repeated, the lifting volume of advancing per circulation is controlled to be 5-10 cm; and the advancing can be stopped until a bottom plate of the working face is adjusted to a normal position. The method for quickly lifting the bottom on the soft bottom combined mining working face with the large inclination angle, disclosed by the invention, has the advantages of strong operability, safety and reliability, high efficiency and good effect.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method suitable for rapid bottom lifting when a hydraulic support of a working face is broken and drilled under the conditions that the bottom slab of a working face with a large inclination angle is soft in nature and prone to deliquescence and softening when exposed to water. Background technique [0002] Coal seams with large dip angles are mined by comprehensive mechanization. If the lithology of the floor of the fully mechanized mining face is soft and easy to deliquesce and soften when exposed to water (such as mudstone), the hydraulic supports are prone to bottom breaking and drilling during the mining process. °~55°), causing the bracket to sink and crooked, and even topple over in severe cases. This not only seriously affects the normal production of the working face, but also is extremely difficult to deal with. Therefore, it is a technical problem to ensure safe...

AI Technical Summary

Problems solved by technology

The production conditions of the large-inclination working face are complicated, and the technical management level is high. Only relying on preventive technical measures cannot completely guarantee the normal production of the large-inclination working face. method is very necessary and has important practical significance to ensure the normal production of fully mechanized mining face with large dip angle

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