Method of medium and low depth steep coal-bed development

FIELD: mining.

SUBSTANCE: invention concerns mining, particularly the methods of developing bedded mineral deposits sloping at 40-50 degrees to the horizon. The method of medium and low depth steep coal-bed development involves preparation of extraction pillar by drifting belt entry and airway along the bed course, installation chamber with creation of face line slanted against the bed course line at an angle approximately equal to, but not less than the seam dip angle, and mounting of powered support sections in the installation chamber tilted against the face line and bed course, i.e. along the line of dip, coal extraction by a cutter-loader suspended at trolley and safety ropes, maintaining of working face roof by mobile powered support sections shifted following the working face line to the face and to the belt entry direction, and rock pressure control over complete roof collapse. After a powered support section reaching the belt entry it is lifted to the surface and undergoes technical inspection and maintenance works, then it is assembled again in the working face, this time at the junction with airway.

EFFECT: improved efficiency and reliability of development of bedded mineral deposits sloping.

1 dwg

 

The present invention relates to mining, in particular to methods of mining of bedded deposits of minerals lying at an angle of 40-50 degrees to the horizon.

There is a method of developing a steeply inclined coal seams on the development system "Long poles on strike", including transport and ventilation drifts, mounting the camera at an angle to the strike of the formation, installation of shields at an angle to the line of the stope and perpendicular to the line of fall of the reservoir, the hollow coal cleaning harvester hanging on the traction and safety ropes, and gravity transport of coal along the face [1]. The disadvantage of this method is that during the development of steeply inclined strata of the shields during their advancing slides along the lines of drop formation. Because of this, they have to rule in each cycle, shifting, thereby compensating the amount of slipping, and this requires a considerable investment of time. In connection with this dramatically reduces the efficiency of the development steeply inclined seams this way.

For the prototype accepted way to develop steeply inclined seams of medium thickness and thin, including the preparation, excavation and post-conducting transport and ventilation drifts along the strike of the formation, mounting the camera with the formation of the slaughtering of the seam coal under the m to transport and ventilation drifts - and the installation of sections of powered roof supports at an angle to the lines of the face and stretch reservoir dredging coal cleaning harvester and maintenance of the roof stope sections of the mobile mechanized roof supports, movable after podvigina line stope on the bottom and side ventilation drift, and management of mountain pressure complete collapse of the roof [2].

The disadvantages of the prototype are:

- the narrow scope of the method, limited to reservoirs with stable coatings as applied shield support due to their design, cannot provide a more complete tightness of the roof; this entails the occurrence of accidents at the break of roof rocks in the workspace stope;

- in the space between the mechanized roof supports are electrical cables and hydraulic hoses, high and low pressure; even when the reservoir with sustainable roofing is very likely separate wood thrown rocks that can damage the cable or the sleeve in the space between the supports, and it is also an emergency situation;

- low maneuverability of the shields, due to the design features of the device, shifting the racks of each section.

These drawbacks reduce the effectiveness of the development steeply inclined coal seams with what edstam complex mechanization.

The aim of the invention is to increase the efficiency of development steeply inclined coal seams of medium thickness and thin through the use of gravity to increase maneuverability lining and reduce the slope of the line stope in the direction of working of the array.

This objective is achieved in that in the method development steeply inclined coal seams of medium thickness and thin, including the preparation, excavation and post-conducting transport and ventilation drifts along the strike of the formation, mounting the camera with the formation of the slaughtering of the seam at an angle to the transport and ventilation drifts and installation of sections of powered roof supports at an angle to the lines of the face and stretch reservoir dredging coal cleaning harvester and maintenance of the roof stope sections of the mobile mechanized roof supports, movable after podvigina line stope on the face and in the direction of one of the drifts, line stope give inclination towards working the array is approximately equal to, but not less than the corner of the bedding layer, sections of the mobile mechanized roof supports move in the direction of transport of drift, released on the transport passage of the shields after maintenance installed in the upper part of the stope on pairing it with ventilati is authorized by the roadway, and the angle at which the section of powered roof supports are mounted relative to the line of strike of the seam, take the direct.

The essence of the method is illustrated by scheme of arrangement of equipment in a mining face and the adjacent openings shown in the drawing.

The method can be implemented as follows. In the mining field is steeply inclined coal seam average power or subtle prepare extraction column along the strike of the seam holding the vehicle 1 and vent 2 drifts and mounting chamber 3 at an angle to the strike towards the subsequent working of the array is approximately equal to, but not less than the corner of the bedding layer. In mounting the camera along the line of the stope mount section of powered roof supports 4, directing them to the line of fall of the layer (perpendicular to strike) with the ability of the proposed shifting in the direction of transport of the roadway, and Shearer 5, able to hit the coal bilateral (chelnokova) scheme and the associated rope through the block 6 with the winch 7, installed on the ventilation drift 2. In the transport passage 1 mount the vehicle, for example a conveyor belt 8, and a mobile hopper-loader 9 - mate drift 1 with clearing face.

Excavation of coal is carried out in the following order. Shearer 5 suspended on traction and load the additional ropes, when moving from the transport passage 1 to the vent 2 provides breaking strip coal from the array. The broken coal is gravity fed to a pair stope with the transport passage 1, enters a conveyor hopper 9 and reloaded onto the conveyor belt 8. After the harvester as it goes up perform shifting of the support units 4 in the direction of transport of the roadway, i.e. dip, and on the face. After the release of the Shearer 5 on vent drift 2 complete shifting of the remaining shields 4 and begin the notch of the next strip of coal during movement of the Shearer 5 from exhaust passage 2 to the vehicle 1. This shifting of the support units 4 carry out bottom-up, starting with the third of the ventilation drift, etc.

Naturally, when the movement of the sections on the longwall face and in the direction of the transport passage of the lower section at some point will not be the equipment. Her unload and transport the roadway 2 and then give to the surface for repairs or maintenance, after which the shield section set in a mining face, but in its upper part at the interface with the ventilation drift.

Thus, by reducing the slope of the line stope to the line stretch seam appeared who makes sure the orientation of the shields on the line of fall of the layer (perpendicular to the stretch of the reservoir). But due to the orientation of the shields on the line of fall of the reservoir gravity is summed with the efforts of jacks shifting and shield section moves easier and faster, i.e. increases its maneuverability. This, in turn, allows to increase the speed of movement of the harvester, i.e. its performance for the blasting of coal. Due to more dense installation of shields along the line of the stope at a higher rate tightening of the roof, which greatly reduces the likelihood of penetration of the roof rocks in the workspace of the face, i.e. increases reliability of the stope. In addition, this way you can work out the reserves that lie between faults, because there is no regulated the length of the stope. Therefore, the scope of the method can be extended. All this contributes to the efficiency of development steeply inclined coal seams of medium thickness and thin, i.e. achieving the target.

To implement this method requires special shearers is capable of dredging coal bilateral (chelnokova) scheme. The layout of such a harvester is shown in the description of the technical solution [3]. The use of the harvester such composition in conjunction with the reduction of the slope angle of the face relative to the stretch of the reservoir which allows you to exclude operations notch niches in the upper part of the face, and at the bottom. And it also not only increases the reliability of stope, and development efficiency.

Sources of information

1. Zhigalov M., USSR author's certificate S.A. Technology, mechanization and organization of underground mining: Textbook. for universities - M.: Nedra, 1990, s-285, RIS (similar).

2. The way the development of steep coal seams of medium thickness and thin. RF patent №2285122, 7 AS 41/18, publ. 2006, bull. No. 28 (prototype).

3. Uzkozahvatnoj harvester to extract coal from the steeply inclined strata. RF patent №2235202, 7 AS 27/02, Publ. 2004.08.27, bull. No. 24.

Method development steeply inclined coal seams of medium thickness and thin, including the preparation, excavation and post-conducting transport and ventilation drifts along the strike of the formation, mounting the camera with the formation of the slaughtering of the seam at an angle to the transport and ventilation drifts and installation of sections of powered roof supports at an angle to the lines of the face and stretch reservoir dredging coal cleaning harvester and maintenance of the roof stope sections of the mobile mechanized roof supports, movable after podvigina line stope on the face and in the direction of one of the drifts, characterized in that the line stope give inclination towards working array is approximately equal to but not least , the corner of the bedding layer, the section re vignau mechanized roof supports move in the direction of the transport passage, released on the transport passage of the shields after maintenance installed in the upper part of the stope on pairing it with the ventilation drift, and the angle at which the section of powered roof supports are mounted relative to the line of strike of the seam, take the direct.



 

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