RU2231646C1 - Lining for supporting a breakage face of a steeply inclined coal seam - Google Patents

Abstract

FIELD: production of coal and other mineral product.

SUBSTANCE: the invention is intended to be used in mining at production of coal and other mineral product from the steeply inclined coal seams. A problem of the invention is an increase of efficiency of supporting a working space of a coalface and spreading of a range of the invention application. A lining for supporting a breakage face of a steeply inclined coal seam contains a supporting beam of a box-shaped cross-section, a drilling mechanism installed inside the supporting beam, a hydraulic prop, hydraulic and electrical connectors and a base. A goaf part of the supporting beam is rigidly interlinked with the normally oriented in it hydraulic prop and supplied with a rigid overhead cover. The rigid overhead cover on the working face side is supplied with a shearing deflector and on the goaf side is additionally supplied with the jib-sticks and is linked with the hydraulic prop. The goaf end of the cover is rigidly linked with the fence that is normally oriented upward to it and directed downward. The base is rigidly linked with the fence oriented upward by a normal to the cover. The cover is linked with the supporting beam asymmetrically with formation of a console sideways from the supporting beam.

EFFECT: an increase of efficiency of supporting the working space of a coalface.

5 dwg

Description

The invention relates to mining, in particular to supports for the face of steeply inclined seams during coal mining according to the development system ″ Long Poles along strike ″.

A known unit for the development of steep coal seams of medium power, containing various elements for securing the roof, feeding a mining machine to the face, separating coal from the array, frontal movement [1].

The disadvantages of the unit are increased sensitivity to changes in the length of the face due to deviations in the parallelities of the preparatory workings, metal consumption, clutter of the working space of the face by the elements of the unit.

A support was adopted for the prototype to maintain the working space during the development of formations, containing a support beam of a box section, inside which a drilling tool, hydraulic jacks, hydraulic racks, hydraulic and electrical connectors, a fence protecting the working space from the penetration of collapsed rocks and the base [2] are installed.

The disadvantages of the prototype are:

- low reliability of fastening the roof of gently sloping (0-18 °) formations lying at an angle of the second half of the range, and the inability to use this lining on inclined and steeply inclined formations due to the high degree of probability of turning the lining around the support beam when removing the pressure;

- the impossibility of using this lining on formations with unstable and loose roofs due to the lack of overlap and back-up of the roof during movement.

These shortcomings, in our opinion, sharply reduce the scope of this lining and the efficiency of maintaining the working space of the working face.

The purpose of the invention is to increase the efficiency of maintaining the working space of the working face and expanding the scope of the lining to steeply inclined beddings and roofing rocks to loose inclusive by eliminating the rotation of the lining around the support beam.

This goal is achieved by the fact that in the lining containing the support beam of the box section, inside which the drilling tool is installed, hydraulic jacks, hydraulic jacks, hydraulic and electrical connectors and the base, the support beam is rigidly connected with the overlap: the overlap from the bottom face is equipped with a clearing visor, and with the dam - rigidly, by means of jibs, connected to the hydraulic strut, moreover, the hydraulic strut is rigidly connected to the support beam in the normal direction, the dam end of the support beam is provided with a guard, normal to the beam down, the base is equipped with a guard directed normal to the support beam up.

The invention is illustrated by diagrams.

Figure 1 shows the lining section in the face (side view); figure 2 is a cross section of part of the support beam, embedded in the coal mass; figure 3 is a cross section of a part of the support beam supporting the bottom hole space; figure 4 - linear section lining (view from the face of the face); figure 5 - supporting beam with jacks moving (plan view).

The support for maintaining the working face of a steeply inclined coal seam contains a support beam 1, an overlap 2, hydraulic jacks for a shifter 3, a hydraulic stand 4, an upper guard 5, a hydro-electrical connector 6, a lower guard 7, a base 8 and a drilling tool 9.

The support beam 1 has a box section and can be made of two channels 10 and 11 mounted in parallel, oriented by the shelves to each other and connected by means of plates 12 by welding. Moreover, in the roof support zone, in its lower part, the beam 1 has a technological gap 13, and in the zone introduced into the coal mass, the inner space between the beam 1 and the drilling tool 9 is filled with antifriction material 14. The blocking part of the support beam 1 is rigidly connected, for example by welding , with an overlap 2, which is equipped with a clearing visor on the side of the face, the obstruction end is rigidly connected with the upper guard 5, oriented downward along the normal. In the inner space of the support beam 1 is installed drilling tool 9.

The overlap 2 is welded asymmetrically to the support beam 1, that is, the axis of the overlap 2 is offset relative to the axis of the support beam 1, forming an overhanging console. To provide the necessary stiffness, the overhanging console with the jib 15 is connected to the hydraulic strut 4.

The supports are installed along the entire length of the working face with fences close to each other, thereby blocking the working space of the working face from the breakthrough of rocks located behind the support. To do this, a number of wells are planned at the boundaries of the formation with the roof, a support beam 1 is inserted into each wellhead, and a hydraulic support 4 is bursting between the roof and the soil. The rams 3 connect the support beams of adjacent sections: on the first section, for example, jack cylinders are attached to the brackets, then on the second section - rods, on the third - again cylinders, etc. In this case, the initial state of the jacks of the movement - the rods are extended halfway. The piston and rod cavities of the ram jacks 3 are connected by a hose to the hydraulic connector 6. The space behind the barriers 5 and 7 is filled with rock, for example, roof collapse.

The lining works as follows.

First, the drilling tool drives are connected via a hydraulic connector, for example, to a shearer working with this support. When a drilling tool is turned on, wells are drilled to a depth equal to the amount of capture of the executive body of the extraction machine, the resulting bayonet is removed from the well into the bottom hole.

At the end of the deepening of the wells, the drilling tool is turned off, the spreader is removed from the hydraulic stand 4 and then the shifting jacks 3 are put into operation - the support beam of this section of the lining moves into the drilled well, dragging the post 4, overlap 2 and fencing 5 and 7. carries out chipping of the interwell pillar of coal at the top of the seam, if it does not collapse on its own. Under the influence of weight, the obstruction of the lining tends downward along the dip of the formation, which leads to the occurrence of the moment of the component of the gravity of the lining relative to the axis of the support beam and the danger of turning the support beam in the well, i.e. support stability loss. Due to the asymmetry of the lining section, this does not happen. When removing the pressure from the lining, the cantilever part of its overlap, on the contrary, will be pressed to the roof due to the weight of the lining, preventing its significant exposure, and the movement of the lining section will proceed with an insignificant but supporting roof. At the end of the movement, the lining is again bursting and power is removed, and the work on moving is transferred to the adjacent section of the lining.

Thus, due to the asymmetric connection of the overlap with the support beam and providing the necessary rigidity with the installation of the jib, rotation of the support beam in the well is excluded, which allows the use of this support when excavating not only gentle, but also steeply inclined formations; due to the roof back up during the movement, it becomes possible to use this lining when excavating formations with an unstable roof, i.e. to increase the efficiency of fastening the roof in the face, and this is the purpose of this invention.

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. 290, Fig. 3.16.

2. RF patent No. 2186977 (prototype).

Claims (1)

A support for maintaining the working face of a steeply inclined coal seam containing a box-shaped support beam, a drilling tool installed inside the support beam, a hydraulic stand, hydraulic and electrical connectors and a base, characterized in that the block part of the support beam is rigidly connected to the hydraulic stand normally oriented to it and is equipped with a hard overlap, the slab on the bottom side is equipped with a clearing visor, and with the overburden additionally, by means of a jib, it is connected with a hydraulic stand, for the shaft end of the overlap is rigidly connected to the fence, normally oriented to it and directed downward, the base is rigidly connected to the fence, oriented upward normal to the overlap, and the overlap is asymmetrically connected with the support beam with the formation of a console to the side of the support beam.

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