SU1219819A1 - Arrangement for protecting working-face from caving - Google Patents

Description

The invention relates to mechanized fortifications for underground excavation of thick, mostly flat, coal seams.

The purpose of the invention is to increase the efficiency of fastening of the bottom when working sections of mechanized support on powerful layers

FIG. 1 shows a lining section with the proposed device, side view j in FIG. 2 - fencing shield, view from the side of the support section in FIG. 3 is a section A-A in FIG. 2

The lining section comprises a base 1 with a spring-loaded articulated toe 2, a main enclosure 3 supported on hydroracks 4, a cantilever enclosure 5 with a lever 6 connected to a hydraulic jack 7, upper to 8, to which is attached by hinges 9 to a protective shield 10, consisting of links I-III connected by axis 11 and connected to the cantilever fence by hydraulic jacks 12 mounted on the brackets 13 of the cantilever rail and connecting axes 11. The link of the shield consists of parallel non-axle beams 14. Herewith, part of the links (II, III, Fig. 2) can be connected by conventional hinge links, including cylindrical sleeves 15, rigidly fastened with longitudinal beams 14, mounted on connecting axles 11. From the displacement along the axis of the sleeves, they can be fixed for example, screws passing through the threaded holes in the sleeves and interacting with circular external grooves on the connecting axis 11. Other links (I, II, FIG. 2) can be connected with the possibility of mutual displacement in height. This is ensured by carrying out on the axis 11 of the gripper slider 17 interacting with the longitudinal beams of the link 1, having terminators 18 for the grips 17. At the free ends, the longitudinal beams of the link I may have different cross-sectional shapes, for example, round I-beam (Fig. 3). Accordingly, the design of the grippers 17 is adopted according to the profile of said beams. The height II of the link II relative to the link I can be shifted 10

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12198192

with a hydraulic cylinder 19, the rod of which is hinged on the top 8, and the hydraulic cylinder is connected with the connecting axis of the links I and II.

Section lining with the proposed device works as follows.

In the absence of extraction of the coal, the cantilevered fence 5 and the links I-III connected to it are located at some distance from the bottom in order to avoid interference with the breaking of coal. During coal extraction, the cantilever fence 5 is moved forward until it stops against the toe of the top 8 into the face, the shield protecting the hydraulic jacks 12 is pressed against the bottom surface. The implementation of links I-III from the dispersed longitudinal beams makes it possible to visually monitor the state of the face and adjust the position of the links relative to the face and height. When approaching the support sections of the executive body, for example, auger, break bar, and others, the shield part of the shield is pulled to the cantilever fence 5 or the total height of the guard wall is reduced by reducing the hydraulic jack 19. If the power level exceeds the maximum capacity the height of the executive body of the combine, can be flipped out using various mechanisms or devices, for example, scalpers, of both known and new designs.

When the maximum power is removed, the links I and II are fully extended, and the grippers 17 are in contact with the limiters 18. The links of the fencing can be rotated around the axes in any direction, ensuring a reliable fit to the flat and curved bottom of the slab. With some reduction of the hydraulic jack 19, the links 1 and II provide contact with the convex curvilinear surface of the bottom in this zone, which is usually observed when the coal is pressed.

The height adjustment of the shield can be carried out either by reducing the hydraulic jack 19, or by overlaying the link 55 on III on the link II by turning the first one around the connecting axis. In the case of using one of these methods, the shield becomes two30

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its height can be reduced by 1.5 times. When combining links I and II and the subsequent rotation of link III around the axis and overlaying 12198194

On the combined I-II unit, its shield becomes monotonous, its height decreases by a factor of 3 for the same link sizes.

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IS

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Editor O. Golovach Order 1307/45

Compiled by V.Ponomareva

Tehred A.Aliyev Proofreader V.But ha.,

Circulation 470 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

A DEVICE FOR RETAINING THE BOTTOM DOWN FROM CIRCULATION, comprising a guard shield mounted on the overlap of a powered roof section using a hinge and a hydraulic jack, made of links pivotally interconnected by axes, and pressure hydraulic jacks, characterized in that, in order to increase the efficiency of securing the face during operation of the sections mechanized lining on powerful layers, the axles are equipped with sliders with clamps, and the links are made of parallel beams, the ends of which are movably mounted in the sliders, while the axis of the links is a hinge but they are connected with clamping hydraulic jacks, the other ends of which are fixed on the cantilever fence of the mechanized section. _about lining. © SU. „, 1219819>