RU2327869C1 - Movable operating element of mining machine - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to the mining and can be used in mining machines for coal cutting and breaking the soft ores, e.g. kimberlite. The movable operating element of the mining machines contains the screw conveyer with the inclined spiral cutting strip consisting of the separate sections projecting above the screw conveyer's blade. The section of the spiral cutting strip are placed alternately to each other at the distance L equal to 0.3D of the angle diameter D of the loosened fragment, have the width B equal to D - the angle diameter D of the loosened fragment. The angle of inclination to the contour line of the upper side of the breaking segment is taken as 7°, and the angle of inclination to the contour line of the inner side of the breaking segment is taken as 47°.

EFFECT: area of application of machines for coal cutting and soft ore breaking is broadened.

2 dwg

Description

The invention relates to the field of mining, and can be used in mining machines for breaking coal and soft ores, for example kimberlite.

Known working body of the mining machine (AS USSR No. 362134, E21C 27/22, E21C 25/16, publ. 12/13/1972, bull. No. 2). The device includes a drive shaft, a bored hole and a spiral cutting edge with an increasing radius of winding, and in order to increase the destruction efficiency, each coil of the spiral has a cleaver. The disadvantage of this invention is the narrow scope associated with the inability to obtain a large yield of large fractions of the recaptured mineral.

The executive body of the mining machine is known (USSR AS No. 373407, Е21С 25/16, publ. 12.03.1973, bull. No. 14). The device consists of parallel mounted discs on the shaft, the disc made of two parts with a variable external radius, one of which is equipped with teeth, and the other is offset from the first and reinforced by a solid shearing edge. The disadvantage of this invention is the narrow scope associated with the inability to obtain a large yield of large fractions of the recaptured mineral.

Known working body of mining machines (AS USSR No. 573585, E21C 25/10, publ. 1977, bull. No. 35). The device consists of a slotted disk and auger, and the upper part of the auger blade is reinforced with a solid, inclined toward the transportation of coal, shearing strip, protruding above the auger blade and having a cross-section in triangular shape. In order to facilitate the replacement of the shearing strip during wear, it is made of separate sections and bolted to the upper part of the blade. The disadvantage of this invention is the narrow scope associated with the inability to obtain a large yield of large fractions of the recaptured mineral.

The technical result of the invention is to expand the scope of devices of this type by increasing the yield of large fractions of the recaptured mineral.

The technical result is achieved by the fact that in the working body of mining machines containing a screw with an inclined spiral shearing strip, consisting of separate sections protruding above the auger blade, according to the invention, the sections of the spiral shearing strip are staggered relative to each other at a distance L equal to 0, 3D of the average diameter D of the chipped piece, have a width B equal to D - the average diameter of the chipped piece, and the angle of inclination to the horizontal of the upper side of the cleaving segment is taken equal to 7 °, and the angle by womb to the horizontal inner side of the shear segment is determined to be 47 °.

The application of the invention in comparison with the prototype will expand the scope of devices of this type by increasing the yield of large fractions of the recaptured mineral.

The working body of mining machines is illustrated by drawings, where Fig. 1 shows a schematic arrangement of the organ on the face, and Fig. 2 schematically shows a cross section of a shearing segment.

The drawings show:

1 - hub hub;

2 - auger with blades;

3 - chipping sections;

In - the width of the chipping sections 3;

L is the distance between the chipping sections 3 located in a checkerboard pattern.

The working body of mining machines contains a hub hub 1 with a screw 2 attached to it with blades. Chipping sections 3 are fixed on a screw 2 with blades in a checkerboard pattern, for example using a bolted connection (not shown conventionally in the drawing). Chipping sections 3 protrude above the blade of the screw 2 and can be reinforced with carbide inserts on top and bottom. Chipping sections 3 form a "discontinuous" spiral chipping strip protruding above the blades of the screw 2 and tilted towards the transportation of coal. Chipping sections 3 have a width B equal to the average diameter D of the beaten piece. The width in the shearing section 3 is taken depending on the required lumpiness of the recaptured mineral (one of the main indicators of lumpiness is the yield of large fractions of the recaptured mineral or the average diameter D of the recaptured piece). The width in the shearing section 3 may be from 50 to 250 mm. The upper width limit In the shearing section 3 is due to the structural capabilities of the screw 2 with blades for loading the broken mineral on the conveyor. Chipping sections 3 are located relative to each other in a checkerboard pattern at a distance L equal to 0.3 of the average diameter D of the piece. The arrangement of sections 3 in a checkerboard pattern provides the smallest (compared to a solid cleaving strip) energy consumption of breaking minerals and allows you to get a large chip - a large yield of large fractions (this effect is described in the book: A.V. Zelenin. Fundamentals of soil destruction by mechanical methods. Moscow Engineering, 1968, pp. 280-282). A large yield of large fractions will increase the efficiency of mechanical breaking, for example, in the extraction of kimberlite ore, where a large cleavage will significantly reduce the mechanical effect on diamonds and prevent their destruction. The angle of inclination to the horizontal of the upper side of the cleaving segment 3 is taken equal to 7 °, and the angle of inclination to the horizontal of the inner side of the cleaving segment is taken equal to 47 °. Such tilt angles provide the smallest regrind of the recaptured mineral during breaking and loading.

The working body of mining machines works as follows. By rotating the hub hub 1 and feeding the auger 2 with the cleaving sections 3 fixed to it, they are destroyed by a flank cleavage and a mineral, such as coal or kimberlite, is loaded onto the conveyor. Due to the fact that the shearing sections 3 have a width B equal to the average diameter D of the chipped piece and are arranged relative to each other in a checkerboard pattern at a distance L = 0.3 D, a large chip is obtained with good fracture energy consumption and a large yield of large fractions of the broken mineral .

The use of the working body of mining machines provides the following advantages:

- increase the yield of large fractions of minerals;

- obtaining a large chip;

- the possibility of breaking kimberlite with high safety of large diamonds.

Claims (1)

The working body of mining machines, containing a screw with an inclined spiral cleaving strip, consisting of separate sections protruding above the auger blade, characterized in that the sections of the spiral cleaving strip are staggered relative to each other at a distance L equal to 0.3D of the average diameter D of the beaten pieces, have a width B equal to D - the average diameter of the beaten piece, and the angle of inclination to the horizontal of the upper side of the cleaving segment is taken equal to 7 °, and the angle of inclination to the horizontal of the inner side of the cleaving guide segment is determined to be 47 °.

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