SU883482A2 - Pneumatic bladder roof support - Google Patents

Description

(54) PNEUMATIC BOLT

 . I.

The invention relates to mining, in particular to pneumatic-ball crepe and cleaning faces, and can be used in the development of thin coal seams with unconstrained hypsometry.

According to the main author. St. No. 812937 a known pneumo-ball support, comprising a base, made in the form of flat vertical guides doubled vertically, which is connected to the locking element with a locking element from the embankment side, carrying the elastic element and the feeding chamber, made in the form of an elastic flexible inextensible sheath, which is installed between the sealing ends of the flat guides and the locking element, wherein the flat guides, the feeding chamber and the locking element are interconnected by means of an extensible shell, the surface of which is has an anti-friction coating, an outer microprotrusion to prevent slipping of the fixing side of the dam, and an extensible shell attached to the bottomhole ends of the flat guides by means of clamping strips and covers the supply element with a tensioning element. In addition, elastic ne2

The element can be made of a continuous, non-expandable flexible shell and an internal stretchable shell to hold it between the guides (}.

The disadvantage of this support is that it is impossible to regulate the force of locking in it, and this reduces the reliability of its work, especially in conditions of weak rocks.

The purpose of the invention is to increase the reliability of the support by adjusting the locking force.

The goal is achieved by the fact that

10, the locking element is designed in the form of a vertically doubled flat guide, a continuous flexible non-expandable shell and an expandable shell to hold the non-expandable shell between the guides.

15

FIG. 1 shows a general view of the support; in fig. 2 node I and FIG. I; FIG. 3 shows section A-A in FIG. 2; in fig. 4 - node P on fig. 3; FIG. 5 - node P1 in FIG. 3

The support I is located in lava 2 with a smooth lowering of the roof 3. In preparatory works 4 there is a conveyor 5, a compressor station 6 and a support control unit 7.

The support 1 consists of vertically doubled flat guides 8, on which a scraperostrug with cutters 9 and scrapers 10 are hinged. The supporting elastic elements of the chamber 11 are located between the guides, and the feed 12 12 is located between their inner ends.

All the chambers are made of a continuous flexible non-expandable shell to the guides directly are not attached, but are pressed against them with an expandable inner shell 13, which covers each chamber separately and is attached to the guide on both sides of each chamber using clamping strips 14 and bolts. The guides and the feed chamber 12 are wrapped with another stretchable sheath 15 — an outer one, which is attached to the guide pressure strips only at the ends. Both shells are attached with tension so that they press the chambers to give them an elongated ellipse shape. The outer shell externally has a microrelief with protrusions 16, which prevent sliding of the support in the direction of the dam. To give flexibility in the bottom plane, the guides have hinges 17.

Before excavation, the coal is supplied with compressed air into the supporting chambers 11 of the bottomhole and overhanging guide 8, which are spread and spread along the roof and the soil with guide forces.

When the coal is excavated, the load-bearing chambers of the filling guide with working thrust (they act as a stopper element) are expanded and the compressed air is fed into the feed chamber 12, which straightens and feeds the bottom-hole guides with cutters 9 and scrapers 10 to the bottom.

The microprotrusions 16 of the outer shell 15 do not prevent the downhole guides from moving to the bottom, and at the same time do not allow the obstructive guides to slip towards the obstruction. When applying the bottomhole guides to the bottomhole, the

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7, the sheath 15. After the end of the supply, the downhole guides are opened with a working force and relieve the pressure in the supply chamber 12 and the load-bearing carrier chamber. The outer shell 15 is compressed and pushes the blockage guides to the face. Then the bulging guides are burst again, reduce the pressure to pre-thrust in the carrier chamber of the downhole guides and feed them to the bottom.

The control of the support in the plane of the bottom is as follows.

If it is necessary to submit the executive body closer to the roof, they create greater pressure in the carrying chambers, if closer to the soil, they decrease.

The application of the proposed support will allow effective excavation of thin layers occurring in unstable strong lateral rocks and unsupported hypsometry. The excavation is carried out in automatic mode, and a small number of elements allows you to automate this fixture and manage it using logic blocks from preparatory workings or from the surface.

Claims (1)

Invention Formula Pneumatic bolting on the bus. St. No. 812937, characterized in that, with the aim increasing the reliability of its operation by adjusting the locking force, the locking element is designed as vertical flat guideways, a continuous flexible non-expandable shell and a stretchable shell to hold the non-expandable shells between guides. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 812937, cl. E 21 D 23/00, 04/28/79 (prototype). 7 srie.1 / .17 h /