RU2332566C1 - Method for mining pitching and steeply pitching coal seams - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: method is intended to be used in the mining industry for extraction of coal and other minerals from pitching and steeply pitching seams. The cutter/loader moving along the stope by a pulling cable pulls belt out of the telescopic part of the belt-type conveyor using a run-around roller pivotally connected to the tail end of the loader. The conveyor belt, with its working side being furnished with fins, after leaving the telescopic part, is directed to the stope space by the deflection assembly, the working side of the belt facing the seam roof. The run-around roller at the tail end of the loader turns the belt so that the belt working side faces the seam floor, and the belt moves in the belt road direction. The coal cut by the cutter/loader gets under the loaded part of the belt by gravity and is dragged along the seam floor to the belt road, covered by the belt. The seam pitch being high enough to provide for coal transportation along the stope by gravity, the working part of the conveyor belt decelerates its movement, otherwise it drags the coal along the seam floor. The cut coal covered by the conveyor belt is less prone to being carried away by the ventilation current, and thus forms less dust in the workspace.

EFFECT: increased mining efficiency thanks to forced mechanical transportation of cut coal along stope.

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Description

The invention relates to mining, in particular to methods for the development of inclined and steeply inclined seams during coal mining according to the development system "Long posts along strike".

There is a method of developing steep and steeply inclined coal seams of medium power using an aggregate containing various elements for securing the roof, feeding a mining machine to the face, separating coal from the array, frontal movement of the lining sections [1]. The disadvantages of this method are the increased sensitivity to changes in the length of the face due to deviations in the parallelities of the preparatory workings, metal production, clutter of the working space of the face with aggregate elements that provide a decrease in speed during the gravity transport of the beaten coal to the lower part of the lava, and, on the contrary, provide transportation chipped coal along the face in the soil of the reservoir.

The prototype adopted a method of developing a steeply inclined coal seam, including the preparation of a mining column, the preparation of excavations, the extraction of coal by a shearer, the maintenance of the working space with mechanized support sections, the gravity transport of the beaten coal and the damping of its speed with special devices [2].

The disadvantages of the prototype are:

- the scope of the method is determined by formations with an angle of 45 degrees or more. On seams that are more hollow, the gravity flow of the transport of beaten coal along the face will be disrupted, and speed quenching devices are useless;

- increased dustiness of the working space associated with the use of means of damping the speed of gravity transport of coal;

- increased danger of people in the workspace due to the mobility of metal structures, in particular speed dampers.

These shortcomings, in our opinion, sharply reduce the efficiency of the development of inclined and steeply inclined coal seams.

The purpose of the invention is to increase the efficiency of the development of inclined and steeply inclined coal seams due to the organization of the forced transport of broken coal along the face by means of mechanization.

This goal is achieved by the fact that in the method of developing inclined and steeply inclined coal seams, including the preparation of a mining column by carrying out conveyor and ventilation drifts, an assembly chamber and installation of complex mechanization tools, the extraction of coal in the working face with a shearer, the maintenance of the working face with mechanized roof supports, the organization of transport along the face in the soil of the seam, limiting the speed of gravity transport of chipped coal with speed quenchers and transport of coal along the conveyor To the drift drift, in the conveyor drift, a telescopic belt conveyor is installed with the belt deflection unit and the tape margin in the telescopic part equal to at least twice the length of the working face, to the shearer from the side opposite to the attachment of the traction body, pivotally connected with the possibility of rotation in the formation plane a deflecting roller, by means of which the tape is pulled out of the telescopic part, by the side of the tape provided with oblique ribs, the speed of transportation of the beaten-off coal along the face is limited and the organization of gravity transport or carry out forced transportation in cases of violation of gravity, the transportation of coal through the conveyor drift is organized on the opposite side of the belt and the lower branch of the conveyor belt, and coal extraction is carried out according to the shuttle scheme.

The invention is illustrated by drawings. Figure 1 shows a diagram of the preparation of the extraction column (plan view); figure 2 is a diagram of the stocking of the conveyor belt; figure 3 is the same (axonometric projection).

The extraction column is prepared by carrying out conveyor 1 and ventilation 2 drifts, a mounting chamber 3 and mounting sections of a powered roof support 4 and a shearer 5 suspended on the traction and safety ropes 6 of the winch 7 installed on the ventilation drift 2. A conveyor belt 8 is mounted in the conveyor drift with a margin of tape equal to at least twice the length of the working face, and the corresponding stroke of the cart of the telescopic part. At the interface of the mounting chamber 3 (face) with a conveyor drift, a belt deviation unit 9 is installed, and a bypass roller 10 is pivotally attached to the tail part of the combine 5 at a certain height from the formation soil;

For the conveyor 8 use rubber band, the working side of which is equipped with oblique ribs. The tape with the ribs is stocked so that its working side enters the face of the working face with the ribs towards the roof, and leaves it with ribs towards the formation soil.

As a shearer 5, a narrow-grab combine for the extraction of coal from steeply inclined seams connected with a guide beam can be used [3]. When using a harvester of such an arrangement, its work can be organized as follows.

The shearer 5 through the traction rope 6 moves from the conveyor drift 1 to the ventilation 2 and carries out the breaking of coal from the array, and by means of the roller 10 - pulls the conveyor belt from the telescopic part of the conveyor 8. The beaten coal partially falls under the lower branch of the belt, which also sags through the soil the formation drags it towards the conveyor drift 1. At the same time, oblique ribs on the working surface of the conveyor belt increase the efficiency of transportation. After the harvester goes to the ventilation drift, the bottomhole part of the conveyor belt will be fully extended along the working face by the value of L _s . The shearer 5 is cut into an array, and the belt deflection unit 9 is moved along the conveyor frame to a distance equal to the width of the shearer in the same direction. When the harvester 5 moves down, i.e. from the ventilation drift to the conveyor belt, the working branch of the tape will cover another part of the previously beaten coal and will drag it down through the soil. In this case, the telescopic part of the conveyor 8, with the size of the trolley travel of the telescopic part L _t , will automatically select the slack of the tape formed in the working face due to the reverse stroke of the combine. Due to the weak inclination of the working face, the coal beaten off during the reverse stroke of the combine almost all falls under the moving belt and is transported by it along the soil of the seam.

At the interface of the face with the conveyor drift 1, the beaten-off coal enters the lower branch of the conveyor belt 8, on the opposite side, which is transported outside the extraction section.

Thus, by using a telescopic conveyor belt to organize the forced transport of coal along the face along the seam, the goal is achieved, namely, increasing the efficiency of developing coal seams lying at an angle of 30-40 degrees to the horizon, i.e. strata related to the upper boundary of the range of inclined formations and the lower - steeply inclined. In addition, the moving conveyor belt in the working space of the working face will limit the speed of movement of the beaten coal flow at its own speed, i.e. the conditions of the Safety Rules prescribing the installation of damping means for transporting coal along the face will be met.

Information sources

1. Zhigalov M.L. Technology, mechanization and organization of underground mining: Textbook. for universities / M.L. Zhigalov, S.A. Yarunin. - M .: Nedra, 1990, p. 291, fig. 3.16.

2. The lining section to maintain the face of a steeply inclined coal seam / RF Patent No. 2231647, publ. 06/27/2004, Bull. No. 18 (prototype).

3. Narrow gripping combine for the extraction of coal from steeply inclined seams / RF Patent No. 2235202, publ. 08/27/2004, Bull. 24.

Claims (1)

A method for developing inclined and steeply inclined coal seams, including preparing a mining column by carrying out conveyor and ventilation drifts, an assembly chamber and installing integrated mechanization tools, mining coal in the working face with a shearer, maintaining the working face with mechanized support sections, arranging transport along the working face along the soil of the seam, limiting the speed of gravity transport of chipped-off coal with speed dampers and coal transport along the conveyor drift, characterized in that in A telescopic belt conveyor with a belt deflection unit and a tape margin in the telescopic part equal to at least twice the length of the face is installed to the shearer to the shearer from the side opposite to the attachment of the traction unit, a deflecting roller is pivotally attached with the possibility of rotation, by which pull the tape from the telescopic part, the side of the tape equipped with oblique ribs, limit the speed of transportation of the broken coal along the face when organizing transport of coal or carry out forced transportation in cases of violation of gravity, the transportation of coal through a conveyor drift is organized on the opposite side of the belt and the lower branch of the conveyor belt, and coal extraction is carried out according to the shuttle scheme.

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