Auger cutting tool

FIELD: mining equipment, particularly auger cutting tools of narrow-cut mining machines used in production faces for underground mineral excavation.

SUBSTANCE: auger cutting tool has cylindrical body and loading blade with screw surface on which cutter holders with cutters are installed. Generator of the screw surface is curvilinear and has concave surface arranged from working blade surface side. Radius of curvature provides 40-50° angle defined between lines tangent to outer circle of screw blade and to blade generator in point of their intersection.

EFFECT: increased efficiency of auger cutting tool.

3 dwg

 

The invention relates to mining machines, namely to screw Executive bodies uzkozahvatnoj excavation machines used in Stopes for mining by underground methods.

Known Executive body of the Shearer /1, str, RES/made in the form of a drum with a vertical axis of rotation, which is fixed to the cutting tools (cutters). The disadvantage of this Executive body is bad loading capacity repulsed mineral on the face conveyor. For efficient loading ability of the Executive body of the drum type it is supplied special loading flap.

Closest to the proposed invention to the technical essence and the achieved result is screw Executive body /2/, comprising a cylindrical casing and loading the blade (one or more) with a screw surface on which are located the holders with blades.

In the known technical solution forming a helical blade has a straight view and is located on the radius (perpendicular) relative to the cylindrical body. The straightness of the blade and its radial location in the cross section of the screw does not provide the maximum possible performance of the auger when loading the broken coal face to the Weir. A straightforward implementation of the blades during the rotation of the screw Executive body creates a centrifugal force which, acting on the broken coal, located between the vanes, try to move it relative to the blade outward from the center to the outer surface and to press the coal face, which creates an additional resistance to the movement of coal along the blade, as at the bottom there are irregularities from the effects of incisors. This reduces the flow velocity and performance screw Executive body.

The objective of the invention is to increase the efficiency of the screw of the Executive body.

This problem is solved due to the fact that the screw Executive body, comprising a cylindrical casing and loading the blade with a screw surface on which is installed the holders with blades, thus forming a helical surfaces are curved, concave surface which is located on the working side of the blade, and the radius of curvature is made such that the angle between the tangent lines to the outer circumference of the helical blade and the generatrix of the blade at the point of their intersection was 40-50°.

1 shows a screw Executive body (main view); figure 2 - is a view along arrow a in figure 1 and figure 3 - location of forces acting from coal to screw the fall when its rotation.

Screw the Executive body includes a cylindrical housing 1, loading the blade 2. On the outer cylindrical forming helical surface loading blades posted linear cutters 3.

The curvature parameters of the blade are determined from the following findings (see figure 3). During the rotation of the screw of the Executive body of the blade affects repulsed a lot of coal. Under the influence of rotation of the screw occurs centrifugal force tending to move the coal from the centre to the periphery relative to the blade. The centrifugal force is determined from the expressionwhere m is the mass of coal, inside screw Executive body, kg; R - outer radius of the screw of the Executive body, M.; ω - angular velocity, rad/s; g=9,81 m/s2acceleration in free fall.

If the forming blade of the auger straight, then this power coal will stick to the bottom and create additional resistance while moving along the screw of the Executive body. When a curved surface forming the blades of the centrifugal force F at the output to the external diameter of the screw is decomposed into two forces P and N. P - pressing force coal to the blades, N is the friction force coal on the blade. The most favorable conditions for flow, when the power is P=n This equality is ensured at an angle β=45°. Angle β determine what is between the tangent line to the outer surface at the end point of the blade and line continuation blades from this point. Beyond this angle, you can restrict 40-50°. In this interval, the power P and N are slightly different from each other. Thus, the radius of the bend forming the blades should be such that the angle between the tangent lines to the outer circumference of the screw of the Executive body and to the blade at the point of their intersection was 40-50° (at an angle less than 40° reduced friction force N coal blades and coal beyond the screw, touching the face, at an angle of more than 50° friction is greatly increased, thereby increasing the resistance to movement of coal along the auger).

Screw the Executive body works as follows. The auger housing 1 together with the loading of the blade 2 and the blades 3 are rotated. When driving the mining machine along the face cutters 3 destroy minerals, which is distributed inside the screw between the screw blades. Screw the surface of the blade, acting on the broken coal, moves it along the auger and throws from the zone of its effect on the AFC. However, the coal mass effect and centrifugal force tending to move the coal to the outer surface of the screw. However, the angularity forming blade height helps keep the coal within the blade by friction force N and twisting of the flow within the blade. This reduces the contact of extracted coal for the OEM and reduces the resistance to movement of coal along the screw.

Technical advantages of the suggested screw Executive body are to increase the efficiency of its application.

Increased efficiency is achieved by:

- reducing the power required for loading of coal auger result from the elimination of contact of the coal from the mine during its movement along the screw;

- improve performance by increasing the speed of flow of the coal along the auger due to the reduced resistance to its motion.

Sources of information:

1. Sapogin MS Mining machinery and equipment: Textbook for universities/ Msitaken, Bhalachandra, Viestura. - M.: Nedra, 1995. - 462 S.

2. Patent RU NO. 2149995, 7 E 21 25/04, E 21 25/10, 2000

Screw the Executive body, comprising a cylindrical casing and loading the blade with a screw surface on which is installed the holders with blades, wherein forming the helical surface of the blades are made curved, concave surface which is located on the working side of the blade, and the radius of curvature should be such that the angle between the tangent lines to the outer circumference of the helical blade and the generatrix of the blade at the point of their intersection was 40-50°.



 

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