RU2285122C1 - Method for extraction of steep coal beds of average power and thin ones - Google Patents

Abstract

FIELD: mining industry, possible use for underground extraction of steep coal beds.

SUBSTANCE: method includes preparation of extraction column by driving ventilation and transport drifts and cutting mounting chamber at angle of about 80 degrees to bed expansion line towards following movement of cleaning face, mounting sections of mechanized supports and cleaning combine, extraction of coal by cleaning combine with self-flowing transport of extracted coal along the face, support of cleaning face by sections of mechanized supports and control over mountain pressure by fully collapsing the ceiling. Extraction of coal is performed in accordance to shuttle scheme using two-side action combine, cleaning face is held by sections of self-driving support, mounted at an angle of about 45 degrees to bed falling line by moving device, positioned below posts along bed falling line. Movement of support sections is performed in direction towards cleaning face and ventilation drift, while sections that enter ventilation drift after technical maintenance are mounted in lower part of cleaning face at junction with transport drift.

EFFECT: increased efficiency and safety of extraction.

1 dwg

Description

The present invention relates to mining, in particular to methods for developing steeply dipping strata mineral deposits.

There is a method of developing steep coal seams of medium power using the excavation unit AKZ, which allows you to develop coal seams by the most productive development system - "Long posts along strike" [1]. The disadvantage of this method is its increased sensitivity to the parallelism of the preparatory workings, in particular ventilation and transport drifts, the preparation of which is prepared dredging column.

The prototype adopted a method of developing steep formations of medium thickness and thin, including the preparation of a mining column, maintaining a face with hydroficated supports, mining a coal with a shearer, gravity transport of beaten coal along the face and managing rock pressure to completely collapse the roof [2]. The disadvantages of the prototype are:

- the sliding sections of the mechanized lining along the line of formation fall occurring during the movement;

- increased frequency of alternating loads on a limited section of the roof, associated with the design features of the sections of the mechanized roof support, provoking roof rocks to an earlier collapse;

- low maneuverability of the lining section, due to the large number of connections of this lining section with neighboring sections.

These shortcomings reduce the efficiency of the development of steep coal seams by means of complex mechanization.

The aim of the invention is to increase the efficiency of the development of steep coal seams of medium power and thin by maintaining the face of the unloading self-propelled lining.

This goal is achieved by the fact that in the method of developing a steep coal seam of medium power, including preparing a mining column, conducting ventilation and transport drifts and cutting the mounting chamber at an angle of about 80 degrees to the strike line of the formation towards the subsequent movement of the face, installation of sections of the powered roof support and shearer, mining coal with a shearer with gravity transport of chipped coal along the face, maintaining the face with sections of powered support and control the pressure of the mountain by complete collapse of the roof, coal extraction is carried out according to the shuttle scheme by a double-sided combine, maintenance of the working face is carried out by self-propelled unloading supports installed at an angle of about 45 degrees to the dip line of the formation by a moving device located below the racks along the dip line, the support sections are moved carried out in the direction of the working face and the ventilation drift, and the sections that entered the ventilation drift after maintenance are installed bottom of the stope in conjunction with the transport drift.

The essence of the proposed method is illustrated by the arrangement of sections of self-propelled unloading lining in the face of a steeply falling coal seam shown in the drawing.

The method can be implemented as follows. In the mine field of a thin steeply falling coal seam or medium-power seam, an extraction column is prepared along the strike of the formation by transporting 1 and ventilation 2 drifts and the mounting chamber 3 at an angle of about 80 degrees to the strike line of the formation towards the subsequent movement of the face. In the mounting chamber along the face line, mount sections of non-self-propelled roof support 4, positioning them so that the moving device is below the racks along the dip line, and orienting them at an angle of 45 degrees to the dip line with the possibility of the proposed movement to the bottom and to the side ventilation drift, and shearer 5, capable of beating off coal in a two-way (shuttle) scheme. In this case, the lining sections are installed in increments allowing the transfer of the blocking stand to the side of the treatment face without contact with the adjacent section.

Coal mining is carried out in the following order. The shearer 5, suspended on the traction and safety ropes, when moving from the transport drift 1 to the ventilation 2, breaks the strip of coal from the array. The beaten-off coal flows by gravity to the interface of the working face with the transport drift, where it is loaded into the vehicle in a known manner and exported to drift 1. Following the combine, as it moves along, the top moves the roof support sections 4 as follows. The filling stand is unloaded, moved towards the face and installed along the section axis closer to the face. At the same time, the obstruction stand became downhole, etc., and the lining section itself became closer to the stope line and to the ventilation drift. After the shearer 5 goes to the ventilation drift 2, the movement of the remaining sections of the support 4 is stopped and the next strip of coal is excavated when the shearer 5 moves from the ventilation drift 2 to the transport 1. In this case, since the support is unloading, the movement of the support sections 4 is carried out in the same order (as the combine moves) or from the bottom up, starting from the third from the ventilation drift.

Naturally, when the sections move to the face and towards the ventilation drift, the upper section at some point cannot be moved. It is unloaded and on the ventilation drift 2 and then issued to the surface for preventive repair or maintenance, after which this roof support section is installed in the working face, but already in its lower part - in conjunction with the transport drift.

Thus, due to the use of self-propelled unloading support, the sections can not slide during moving, due to the orientation of the sections at an angle of 45 degrees to the dip line, the sections themselves take turns in the ventilation drift, which allows for routine preventive maintenance and maintenance in a mechanical workshop , due to the unloading, the lining section does not burst twice in the same section of the roof, and this, in turn, improves the condition of the roof during the treatment work. All this helps to increase the efficiency of the development of steeply falling coal seams of medium power and thin, i.e. achieving your goal.

To implement this method, a special shearer is required that is capable of extracting coal according to a two-sided (shuttle) scheme, and sections of non-self-propelled roof support. Such samples of technology have already been developed. As a dredging combine for this method, a combine according to the technical solution [3] can be used, and as a bottom hole lining - lining sections according to the technical solution [4].

Information sources

1. Zhigalov M.L., Yarunin S.A. Technology, mechanization and organization of underground mining: Textbook. for universities. - M .: Nedra, 1990, p. 290-292, fig. 3.16 (analogue);

2. Ibid., P. 284, fig. 3.14 (prototype).

3. A narrow-cut combine for the extraction of coal from steeply inclined seams. RF patent №2235202, 7 Е 21 С 27/02, Publ. 08/27/2004, Bull. Number 24.

4. Artificial mechanized pillar. RF patent №2083844, 6 E 21 D 23/00, Publ. 07/10/1997.

Claims (1)

A method of developing steep coal seams of medium power and thin, including the preparation of a mining column by conducting ventilation and transport drifts and cutting the mounting chamber at an angle of about 80 ° to the line of the strike of the formation towards the subsequent movement of the face, installation of sections of a powered roof support and shearer, mining coal a combine harvester with gravity transport of chipped coal along the face, maintaining the working face with mechanized support sections and managing rock pressure completely collapsing roofing, characterized in that the extraction of coal is carried out according to the shuttle scheme by a double-sided combine, maintaining the working face is carried out by self-propelled unloading support sections installed at an angle of about 45 ° to the dip line of the formation using a sliding device located below the racks along the dip line, the support sections are moved in the direction of the working face and the ventilation drift, and the sections that have entered the ventilation drift after maintenance are installed in the lower part of the treatment face at the junction with the traffic roadway.