METHOD OF OPEN-UNDERGROUND DEVELOPMENT OF A FLAT COAL BED AND WALKING SUPPORT FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC E21C41/00 E21D11/00 E21D23/00 

FIELD: coal mining.

SUBSTANCE: invention relates to mining, in particular to further development of near-outline reserves of a coal mine by a highwall mining system (HWMS) and can be used for the mechanization of work performed during the extraction of HWMS equipment after an accident caused by the collapse of roof rocks into the mine working. The method of open-underground mining of a flat coal bed includes excavation of coal by a highwall mining system. In the event of a fall of collapsed roof rocks, which prevents the extraction of the equipment of the system, a temporary walking support of a rectangular cross section is mounted on the work site in front of the mouth of the working, equipped with mechanized equipment: a hydraulic hammer for crushing large-sized pieces of rock and buckets for loading the rock into a scraper conveyor. The walking support is introduced into the working, and at each step in the coal mass, on both sides of the working, a niche is cut out with a width not less than the width of the permanent support rack; the permanent support is erected after the temporary walking support is passed. Each rack is placed in the corresponding niche. As the walking support advances, the scraper conveyor is increased. The collapsed rock is crushed with a hydraulic hammer, if necessary, to the size of a transportable piece and loaded by buckets into the scraper conveyor under the walking support. At the end of the restored part of the working, the hydraulic hammer and buckets are dismantled, the cross-section of the temporary walking support is changed from rectangular to trapezoidal with the lower part of each rack placed in the corresponding niche. After removing the equipment of the system, the cross-section of the temporary walking support is changed from trapezoidal to rectangular, and then the walking support is brought to the work site and, at the same time, the elements of the permanent support are dismantled. The walking support includes traverses and hydraulic props. Each hydraulic prop is connected to the traverse and adapted for reciprocating movement along the traverse and angular movement in the cross-sectional plane of the support. Each traverse of the forward section is equipped with several roller bearings oriented along the traverse, each of which is installed in alignment with the corresponding support beam of the lagging section. Each traverse of the lagging section is equipped with several roller bearings oriented along the traverse, each of which is installed in alignment with the corresponding support beam of the forward section. To the traverses of the forward section in the space in the middle between the hydraulic props from below, through a fixed support, straight-line guides are attached, oriented parallel to the support beams and kinematically connected to the hydraulic hammer from below. To the traverses of the lagging section, in the space between the hydraulic prop and the edge of the traverse, straight-line guides are attached from below through movable supports, oriented in plan parallel to the support beams, each of which is kinematically connected to the bucket from below.

EFFECT: increased efficiency and safety of mining operations in open-underground coal mining.

2 cl, 10 dwg