RU2299984C1 - Method for unmanned extraction of thick, over 30 meters, sloping coal formation - Google Patents

Abstract

FIELD: mining industry, possible use for underground extraction of thick sloping coal formation.

SUBSTANCE: method includes driving field preparatory mines and extracting coal in directional layers by long faces with usage of cleaning mechanized complexes and with backfill of extracted space. Separation of coal is performed simultaneously in four vertical round section furnaces from soil to formation roof by screw-hammer circular organs with collapsible lining and feeding mechanism, mounted on ventilation drift, after that by one of screw-hammer circular organs body between furnaces is terminated. Coal is lowered along spiral transporting chute, positioned in each furnace. In backfill material of four furnaces channel is expanded for lowering coal and channel for letting people into face for column termination and backfill of excavated space.

EFFECT: decreased coal losses.

2 cl, 10 dwg

Description

The method relates to the mining industry, namely to underground coal mining and environmental protection.

A known method of excavation by furnaces in the reservoir during the preparation of coal runs in a new excavation field during shield mining at a steep fall with a pre-drilled ventilation well in the middle of the furnace, is analogous to [1]. In this case, coal is separated in the furnace by a blasting method, after which coal is drained by gravity through the furnace. In the furnace, wooden, bonfire support is placed. The disadvantage of an analogue is the non-mechanized separation of coal.

The closest technical solution is the method in which, after driving the haul-off and ventilation field drifts, the formation is removed with inclined layers with long lavas equipped with mechanized complexes, possibly with laying out the worked out space [2]. The disadvantages of the prototype are difficulties with the management of the roof in the lower layers, large losses of coal in the interlayer packs and inter-floor pillars of coal (up to 25%), the large complexity and high cost of production due to the significant cost of the mechanized complex.

The basis of the invention is the task of increasing the efficiency and profitability of production due to the vertical arrangement of treatment workings.

The essence of the invention lies in the fact that in the method of unmanned excavation of a powerful, more than 30 m, shallow coal seam, including conducting field preparatory workings and coal mining in inclined layers by long lavas using mechanized sewage treatment plants and laying the mined-out space, the coal is separated simultaneously four vertical circular furnaces from the soil to the top of the bed with auger annular bodies with collapsible support and a feed mechanism mounted on the ventilation drift after h it is one of the auger annular organs that repay the pillar between the furnaces, and the descent of coal is carried out by a spiral transport channel located in each furnace.

The essence of the invention also lies in the fact that in the filling material of the four furnaces, a channel for lowering coal and a channel for passage of people into the slaughter space of the column extinction and laying of the mined-out space are expanded.

Thus, the vertical arrangement of a group of circular treatment furnaces from the soil to the roof allows concentrating the treatment faces, effectively separating coal without the presence of people in the treatment face, transporting coal and paving the worked out space. There is no need for preparatory workings for coal, except for the advanced technological ventilation filling hole. EFFECT: obtaining good dehydration of the filling material after laying it in the worked out space of four vertical furnaces simultaneously removed.

In general, the technical result of the method is the creation of an opportunity to carry out deserted mining of a powerful, more than 30 m, flat coal seam with high technical and economic efficiency and providing a significant, 2.5-fold reduction in coal losses.

Further, the proposal is illustrated by drawings.

Figure 1 shows the scheme of the formation; figure 2 is a General view of the location of the furnaces near one recoil field drift, section AA from figure 1; figure 3 - part of the plan of the excavation field; figure 4 - the upper part of one furnace, section CC of figure 3; figure 5 - the lower part of one furnace, section CC of figure 3; 6 is a contour of the face of the extinction of the column between the four furnaces; Fig.7 is a longitudinal section of two furnaces when laying the mined-out space, section DD from Fig.3; Fig. 8 is a longitudinal section through a column between four furnaces when it is extinguished, section G-G of Fig. 3; Fig.9 is a transverse section of the furnace along one support ring, section F-F of Fig.5; figure 10 is a perspective view of a portion of the spiral groove, view along arrow K of figure 3.

In the drawings, formation 1 with a thickness of more than 30 m and excavation field 2 contain a vertical trunk 3, field bremsberg with walker 4 on the return horizon and field drifts 5 in the soil of the formation, field ventilation and filling bremsberg with walker 6 and field ventilation and filling drifts 7 in the roof of the reservoir, the ventilation shaft 8, the treatment furnace 9, the advanced ventilation and technological well 10, the screw breaker 11, the collapsible ring support 12 of the furnace, the temporary elastic support 13, the spiral transport chute 14, the filling pipe 15, s masonry material 16, the contour of the face maturity coal column 17 for lowering coal channel 18, channel 19 for the passage of people, the drive rod 20 of the baffle body.

The drawings also contain a leg of coal 21 between the furnaces, a bunker 22 of the gutter, a bunker 23 of the offset face, a reloader 24, a railing 25 of the gutter, a stage 26 of the gutter, a support 27 for a field drift, a tightening 28, a reinforcement strut 29, support a drift, a pedigree niche 30 and the rear sight ( coal column) 31 between the furnaces.

The method is as follows.

In the excavation field 2, after the drift of the field workings and advanced ventilation and technological wells 10, the augers 11 are mounted in the faces of the furnaces 9 and the coal separation starts from the bottom up from the pedigree niche 30, forming vertical cleaning furnaces 9. The cleaning works are carried out simultaneously in four furnaces 9 receiving between themselves at the end of the excavation the whole pillar of coal in the form of a pillar 31. The coal is broken off in each furnace 9 by a screw ring annular organ 11, while coal is delivered by gravity along the spiral transport chute 14. Behind the exhaust organ 11 the repair shift (when workers may be in the bottom) establish a permanent annular collapsible support 12, and in the working shift of the sides of the furnace 9 support elastic support 13, which is unwound from under the baffle 11 when one of its ends is fixed to the last ring of the constant support 12. Elastic support 13 is necessary to hold pieces of coal separated from the sides of the furnace 9, with the possible extraction of it. However, studies show that with a circular round section of the furnace, the extraction of coal will be small, therefore, the installation of a permanent lining for one shift per day will be sufficient to maintain the stability of the sides of the mine. The beaten-off coal travels down the spiral transport chute 15 into the hopper 22 and enters the recoil field drift 15 through the reloader 24. The spiral transport chute 14 is connected with the upper end to the chipping organ 11; therefore, its new necessary sections are expanded in the pedigree niche 30 when moving the bottom face. after the extraction of coal in all four furnaces and lowering the collapsible supports 12, which allows simultaneously with the tab to conduct the repayment of the column of coal 31 by the bottom 17 and completely lay the total mined space four x stoves. The filling material is fed into the face through the filling pipe 15, lowered into the bottom hole space of the bookmark from the side of each furnace. Pedigree niches 30 are also laid, therefore, the redemption face can only be reached through the channel for people to pass 18 or the channel for lowering coal 19. The pillar 31 is repaid by one of the chipping organs that were used to separate the coal in the furnaces. Ovens 9 at maturity of the column in the laying of the worked out space remain without support in the upper parts, which can not stop the laying process. Rotation of the fender 11 receives from the rod 20 of the drive installed in the field ventilation and filling drift 7.

Information sources

1. Burchakov A.S., Grinko N.K., Dorokhov D.V. et al. Technology of underground mining of mineral deposits. - M., Nedra, 1983. - S. 283.

2. Mashkovtsev I.L. Underground coal mining technology. - M., Publishing House of UDN, 1982.- 75-78.

Claims (2)

1. The method of unmanned excavation of a powerful, more than 30 m, flat coal seam, including field preparation workings and coal mining in inclined layers by long lavas using mechanized sewage treatment plants and laying out the worked out space, characterized in that the coal is separated in four vertical circular furnaces from the soil to the roof of the formation with auger annular bodies with collapsible support and a feed mechanism mounted on the ventilation drift, after which one of the augers of the annular organs repay the pillar between the furnaces, and the descent of coal is carried out by a spiral transport channel located in each furnace. 2. The method of unmanned excavation of a powerful, more than 30 m, flat coal seam according to claim 1, characterized in that in the filling material of the four furnaces a channel for lowering the coal and a channel for people to enter the slaughter space of the column extinction and the laying of the mined space are expanded.

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