SU95396A1 - Shield for the development of thin and medium power steeply dipping coal seams with stripes in the fall - Google Patents

Description

Sectional shields made of metal or of metal and wood are known for protecting the clearing slab from collapsing rocks in the development of powerful steeply dipping coal seams by falling strips.

A distinctive feature of the proposed shield, also designed for development by stripes (or long pillars), but with a thin pad and medium thickness of steeply dipping coal seams, is flexible. This ensures a smooth lowering of the shield following the advancement of the clearing face.

To give flexibility to the shield, it is made in the form of a wire mesh bag filled with rubble or rock, the particles of which have a slight adhesion. To support this bag, metal U-shaped racks are used, sliding across the strike.

FIG. 1, the proposed shield is zaned sideways in a partial longitudinal section; in fig. 2 - in cross section along LL FIG. one; in fig. 3 given the construction of the grid; in fig. 4 shows a section along the BB of FIG. 3

The proposed shield (Fig. D | relies on the soil of the clearing slab with the help of a stack of 2 and 5 sliding racks located near the soil and the roof of the reservoir is normal to the chest of the slaughter. and at the bottom are pointed. The feet 2 located near the soil are attached to the shield shell by means of bolts 4 and strips 5. The legs 3, with their curved parts, enter the corresponding parts of arc 2, so that the sheets 6 are welded to the latter. racks across the reservoir and regulating such a put m width lining when changing power plas1a. "The legs 3 can vydvigats by crowbar. With decreasing capacity of the reservoir opposite peremep 1 ix" leg 3 is performed automatically as lowering shield.

In order to prevent pieces of rock from falling off the roof or formation soil, iron sheets can be welded to legs 2 and 3, replacing the puffs. When the seam thickness is more than 1.5-2 m, there can be three legs in a rack, of which one is mobile at the roof.

The shield can also be used when working the formations with a bookmark and collapse. In the latter case, a rocker cushion is erected over the shield, which is a kind of mobile support for the roof.

When the seam thickness is more than 2 m, ropes are arranged in the longitudinal direction to increase the carrying capacity of the shield on the upper and lower surfaces of the shield, connecting them with straps like a mattress.

FIG. Figures 3 and 4 show a grid structure, the core of the shield 1, filled with rubble or rock, the particles of which have a slight adhesion. In the direction of the greatest load, the wires are laid close to each other, and in the direction of the action of smaller loads they may be located more rarely. The shield shell is stitched from four grid strips, as shown in FIG. 2. Lower 7 and upper 8 bands perceive the greatest tensile load. The side strips 9 are loaded significantly less, but they are subject to abrasion from the side of the seam, so the end-to-end wires should

be directed along the course of the shield. This design provides the flexibility of the shield, which makes it possible to use it in the presence of small local changes in the thickness of the reservoir and ensures its smooth lowering following the advance of the bottom.

Subject invention

Claims (3)

1. A shield for the development of thin and medium thickness of steeply dipping coal seams with dip bands, characterized in that in order to smoothly lower it after advancing the clearing face, it is made flexible. 2. Shape execution shield pop. 1, characterized in that in order to give it flexibility, it is mounted from a wire mesh filled with rubble or rock, the particles of which have a slight adhesion. 3. The form of the shield according to claim 1, characterized in that, in order to maintain the wire mesh, filled with rubble, U-shaped racks are used, sliding across the strike of the formation. -iS ( 9 / -g- - - RU i; j f FIG. 3 R FIG. four