RU2246007C1 - Support section for cleaning pit of massive steep coal bed - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: section has ceiling with extending shield, base and two supporting beams (upper and lower) with drilling bodies, mounted in parallel to each other and connected to hydraulic posts, mounted perpendicularly to them and to bed, upper and lower fence elements and hydraulic displacement jacks. Fence elements are interconnected with possible angular displacements by transverse beam and mounted at sharp angle to each other, in inner space of which hydraulic posts are mounted. Their rods are jointly connected to upper fence element, and cylinders - to lower one. Each support beam is mounted lower than appropriate hydraulic post along line of bed fall, and connected to it at a tangent, along beam axis with possible free displacements, along fall line - rigidly, and along perpendicular to bed - with possible limited relative displacements. Dump end of support beam by means of traction is jointly connected to transverse beam. Displacement jack is by one end jointly connected to outer side surface of lower support beam, and by other one - to transverse beam of adjacent support section, mounted lower along bed fall.

EFFECT: higher efficiency.

2 dwg

Description

The invention relates to mining, in particular to supports for the face of powerful steeply inclined coal seams during mining of the latter according to the development system with long posts along strike.

Known support for the face of steep and steeply inclined coal seams, containing a base and an overlap installed parallel to each other and connected by hydraulic struts. The racks are oriented normal to the base and overlap [1]. A serious drawback of such a lining is the weakness of the fixation of the section at a given level, as a result of which, for each step of the movement, it slides along the line of formation fall.

The prototype was taken to support the face of a powerful steep coal seam, comprising: a base, an overlap with a visor and support beams with drill bits mounted parallel to each other and connected to hydraulic struts installed normal to them and bedding, the upper and lower fencing elements and jacks movement [2]. The lining section is connected to the mineral array by means of support beams inserted into the wells drilled in the array in the direction of subsequent movement.

The disadvantages of the prototype are:

- the increased length of the supporting beam outside the mineral array due to the need to have a piston stroke of the ram jack that is twice the size of the grip of the executive body of the excavating machine, which significantly reduces the strength properties of the supporting beam itself, and therefore the reliability of the roof support structure;

- when moving the lining section, the point of application of the forces of movement is approximately the middle part of the hydraulic struts of the neighboring sections. This leaves a negative imprint both on the work of the hydraulic stand (the movement force causes the rack to bend), and on the operation of these support sections - the movement force weakens the pressing of the adjoining sections to the roof of the formation;

- increased complexity of the repair and maintenance work associated with the drilling executive body due to the stiffness of the connection of the support beam with the support lining and the inability to withdraw the support beam from the well.

These shortcomings sharply limit the area of effective application of this lining in terms of power and angle of incidence of the seam, and, consequently, the effectiveness of fastening the working faces of powerful steeply inclined coal seams.

The purpose of the invention is to increase the efficiency of fastening the working face of a powerful steeply inclined coal seam by increasing the maintainability of the lining section and reducing the length of the support beams outside the mineral array.

This goal is achieved by the fact that in the section of the lining of the face of a powerful steeply inclined coal seam containing an overlap with a retractable visor, a base and two support beams (upper and lower) with drill bits mounted parallel to each other and connected to hydraulic racks installed normal to him and bedding, the upper and lower elements of the fence and hydraulic jacks moving, the fence elements are interconnected with the possibility of angular movements of the transverse beam and installed on an acute angle to each other, in the internal space of which hydraulic racks are installed, the rods of which are pivotally connected to the upper guard element, and the cylinders to the lower one, each support beam is installed below the corresponding hydraulic strut along the dip line, tangentially connected with it, and the axis of the beam with the possibility of free movements, along the line of incidence - rigidly, and along the normal to the bedding - with the possibility of limited relative movements, the jack of movement at one end is pivotally connected to the outside oh bottom surface of the base beam, and the other - with the cross-member adjacent section of lining installed downstream of drop formation.

The invention is illustrated by diagrams. In Fig.1 shows a section of lining in the face (side view), in Fig.2 - the same (plan view).

The lining section of the working face of a powerful steeply inclined coal seam contains a base 1, two hydraulic racks 2, an overlap 3, two support beams 4, a guard 5, a hydraulic ram jack 6 and a crane for controlling the hydraulic lining system.

The overlap 3 has a box section and in its inner cavity is installed with the possibility of telescopic movement of the visor 7.

The fence 5 is made of two elements - the upper and lower. The upper element of the fence with the possibility of angular movements around axis 8 is connected with the overlap 3, the lower element through the axis 9 is similarly connected with the base 1. Between them, the upper and lower elements of the fence are connected by the transverse beam 10 with the possibility of angular movements around it and form an acute angle, the inner space of which is installed hydraulic struts 2, oriented normal to the base 1 and the overlap 3.

The support beams 4, oriented parallel to each other, the base and the floor, are installed at the level of approximately the midline of the lining height and are rigidly connected by a screed 11. When installing a steeply inclined formation in the face, one of the beams is upper and the other lower (determined by the line formation fall). The obstruction end of each support beam is pivotally connected to a rod 12, by means of which it is also pivotally connected to the transverse beam 10. By means of a clamp 13, the obstruction end of each support beam 4 is tangentially connected to the corresponding hydraulic column 2 with the possibility of free movement in the direction of the axis of the beam, limited movement along the axis of the rack and rigidly - in the direction of the line of fall of the reservoir. In this case, the rack is located above the support beam along the line of rebellion.

The lower support beam is equipped with a bracket 14, welded to its outer side surface at a distance equal to twice the step of moving the section from the obstruction end. Finger 15 is welded at a distance of not less than the step of moving the lining section, but no more than two, from the bracket towards the bottom to the same surface of the support beam 15. At the same distance from the obstruction edge, the same finger is welded to the inner surface of the upper support beam. One end of the ram jack 6 is pivotally attached to the bracket 14, the other end of which is also pivotally attached to the transverse beam 10 of the adjacent support section, which is installed lower along the dip line of the formation.

The lining sections are installed along the entire length of the working face, inclined towards the subsequent movement at an angle of 75 ... 80 degrees, close to each other. The adjacent sections of the lining are connected by jacks of movement. In the initial state, the supports are expanded, the support beams are inserted into shallow wells drilled in the coal mass in the direction of the proposed mining of the extraction column, the visor of each section of the support is hidden in the internal space of the overlap, the rods of the jacks of the movement are half extended.

Lining sections work as follows. During the extraction of the upper strip of coal, the shearer moves along the combine path at a level slightly higher than the support beams of the 4 support sections. At the same time, the combine operator controls the executive bodies of the combine, adjusting the height of their installation above the layer level, and the lining operator, located on a special platform on the side of the combine body, controls the visors of the lining sections. Immediately after breaking off coal in the roofing support zone of the current lining section, the lining driver, by means of a control crane, pushes the visor 7 of this lining section towards the working face, thereby picking up the exposed roof. Chipped coal rushes down by gravity.

After the combine has entered the ventilation drift, the visors of all sections will be extended. Begin excavation of a strip of coal in the lower layer, i.e. in the layer below the support beams 4. In this case, the combine operator controls the executive bodies of the combine in height, avoiding the dangerous approach of one of them to the support beams, and the support operator controls the lining section, in the area of which coal is mined. For this, the lining driver connects a special cable from the combine to the electrical connector on the lining section and turns on the drilling actuators located in the support beams and feeding the drilling tools to the face. After the drilling of wells to a depth equal to the capture of the executive body of the combine, the lining driver turns off the drives of the drilling tools and disconnects the power cable from the lining section. Then, controlling the hydraulic control valve, the visor of the current lining section is returned to the inside of the ceiling 3. After that, it removes the spreader of the hydraulic struts 2 and turns on the hydraulic jacks for moving the lining section. Support beams 4 sections of lining move into the drilled wells. In this case, the movement force from the lower (along the dip line) jack of the movement is transmitted to the lower support beam, from it through the rod 12 to the transverse beam 10 and then to the fence, base and floor. From the upper ram jack, the force is transmitted to the transverse beam 10, then through the rod 12 to the upper support beam, and through the guard to the base and floor. At the end of the movement, the lining section is again bursting, and the work is transferred to the next lining section.

If it becomes necessary to carry out repair or maintenance work on a drill, for example, to replace the teeth of the executive drilling organ, the following operations are performed. Take out a strip of coal in the upper layer, as described above. Then the rods 12 and the clamps 13 of this section of the lining are disconnected from the support beams. Holding the lining section in the extended state, the support beams are pushed out of the wells by the sliding jack of the lower support beam. In this case, the force from the moving jack is transmitted to the lower support beam, the screed 11 and the upper support beam. After selecting the stroke of the ram jack, the coupler 11 is removed, the jack 6 is disconnected from the bracket 14 and attached to the pin 15 and the lower support beam is continued to be removed from the well. When servicing the upper support beam, a movement jack is also used, but now it is transferred from the lower to the upper support beam and proceed similarly. When the executive body of the drill comes out of the array and is in the area adjacent to the working space of the upper layer, the delivery of the drilling tool is stopped, the space around the drilling tool is cleaned and teeth are replaced. It is at this moment that you can also remove this support beam and replace it with a new one.

Thus, due to the connection of the support beam and the support frame along the tangent and the connection of the fence elements at an acute angle to each other, it becomes possible to withdraw the support beam from the well for repair and maintenance work on the drilling body; due to the connection of the support beam by the moving jack with the transverse beam of the adjacent support section, it becomes possible to reduce the length of the support beam outside the mineral array, and this dramatically increases the strength of the beam and the reliability of the support section; due to the movable connection of the support beam with the rack, the transmission of the movement force of the rack to the lining rack in its middle part is excluded, and this sharply reduces the likelihood of bending of the rack and its loss of tightness. All this helps to increase the efficiency of fastening the face of a powerful steeply inclined formation. Moreover, it becomes possible to efficiently mine coal from powerful steep-slope seams at full capacity according to the Long Stretch Pillar development system.

Sources of information

1. Zhigalov M.L. Technology, mechanization and organization of underground mining: Textbook. for universities / M.L. Zhigalov, S.A. Yarunin. - M .: Nedra, 1990, p. 284, fig. 3.14.

2. RF patent No. 2212541, 7 E 21 D 23/00 (prototype).

Claims (1)

A section for supporting the face of a powerful steeply inclined coal seam, comprising an overlap with a retractable visor, a base and two support beams (upper and lower) with drill bits mounted parallel to each other and connected to hydraulic racks installed normal to them and bedding, upper and lower fencing elements and hydraulic moving jacks, characterized in that the fencing elements are interconnected with the possibility of angular movements of the transverse beam and are installed at an acute angle to a friend in whose inner space hydraulic stands are installed, the rods of which are pivotally connected to the upper element of the guard, and the cylinders to the lower one, each support beam is installed below the corresponding hydraulic stand along the dip line of the formation, tangentially connected to it: along the axis of the beam with the possibility free movements, along the line of fall - rigidly, and along the normal to the bedding - with the possibility of limited relative movements, the obstructed end of the support beam by means of a rod is pivotally connected to the transverse beam d, the sliding jack is pivotally connected at one end to the outer side surface of the lower support beam and at the other to the transverse beam of the adjacent support section, which is installed lower in the formation.

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