RU1789705C - Method for driving development working and working member for its realization - Google Patents

Abstract

Usage: means of rock destruction for carrying out preparatory workings in hard rocks. The essence of the method: strikes are applied to annular furrows. The essence of the device: there are hammers 7. The hammers 7 are located on the faceplate 3 around the circles on which the cones 4 are placed, in the arcuate grooves 9 and 10. The hammers 7 are pivotally mounted. During operation, the life of the cones increases. 3 ill.

Description

Fi g. 1

FIELD OF THE INVENTION The invention relates to rock destruction tools, and is intended primarily for use in preparatory mining in hard formations.

There is a known method of influencing the face of a preparatory mine, in which the entire surface of the face is evenly treated with impacts from percussion devices mounted on a manipulator that moves the feed. The disadvantage of this method, especially for strong rocks, is the need to focus on the tool a large impact energy, which is extremely difficult in the limited space of the preparatory development.

The prototype is a method of combined impact on the face, according to which annular grooves are cut on the face, and the formed annular ridges are destroyed by a crushing cone and cone shears. The disadvantages of this method, especially when applied to strong abrasive rocks of the preparatory faces, are the rapid wear of the cones due to friction on the walls of the annular grooves, which reduces the efficiency of the method.

Known executive body of a mining machine, including an arrow with a support element in the form of a rotor having beams equipped with impact hammers. During operation, the boom performs feed motions along and across the face, and the rotor rotates the hammers, striking over the entire surface of the face. The disadvantage of this device is that it does not provide for the formation of furrows and the impact on their walls, and the rock is destroyed by crushing, which has a high energy intensity.

The prototype of the device is a mining machine equipped with cutters that cut furrows at the bottom and a drilling rig. The drill rig is located so that it cannot act on the walls of the cut furrows to expand them and reduce wear of the cutters. This is the disadvantage of a miner.

The aim of the proposed method is to increase the efficiency of rock destruction due to its preliminary attenuation.

This goal is achieved by the fact that by the method of influencing the face of a mining preparation, including cutting the annular furrows with cones, striking along the annular lines of the furrow formation is provided.

The aim of the proposed device is to increase the durability of the executive body by increasing the life of the cones.

The goal is achieved in that the executive body of the combine for mining preparation, containing the faceplate, the cones located on the faceplate around the circumference are provided with impactors located on the faceplate along the circumferences of placing the cones in arcuate grooves made on the faceplate, and the impactors are secured by hinges with the possibility of turning in the grooves.

In FIG. 1 shows a part of a cross-section of the face of a mining preparation processed by the proposed method; in FIG. 2 - front view on

faceplate of a roadheader; in FIG. 3 is a section AA in FIG. 2.

The method includes cutting on the face of the grooves 1 with the formation of ridges 2. Combs

can be removed by one of the known methods.

The application of the method is shown by the example of a cone with a conical working surface (Fig. 1). When rotating the faceplate

3 around the axis of the cone 4 cut annular grooves shown by solid lines. In order to avoid wear of the cone shown by the dash-dotted line during friction against the walls 5 and, especially, 6 into the furrows

strikers are introduced and strikes against the walls, breaking them to a shallow depth, as shown by dashed lines. Due to this, the furrows become wider and friction of the cones against the walls of the furrows is excluded.

Impacts can be applied not only to the walls of the furrows, but also to those places of the face where these walls are formed during operation to prevent friction of the surfaces of the cones against the walls of the furrows.

The executive body implementing this method may be equipped with various types of percussion instruments. Since a large impact energy is not required since small volumes of rock are removed,

electromagnetic reciprocating machines are preferred, which simplify the transmission of electricity from a fixed source to the drums 7 mounted on hinges 8 in

in slots 9, 10 of the faceplate 3. Electricity can be transmitted using the principle of electric induction or using sliding contacts widely used in industry and transport.

Rollers 4 for cutting grooves 1 are located on the faceplate 3 around the circumference. In FIG. 2, for example, three circles are shown — internal, intermediate, and external. There may be several intermediate circles. It is advisable to arrange the arc grooves along the same circles or with a slight displacement relative to them, and place the impactors 7 on the hinges 8 so that they can strike the walls of the furrows, for example, so that through one they are facing the center of the faceplate and away from it. This is how the strikers are located on the inner and intermediate circles. On the outer circumference there is no room for such an arrangement of the impactors; they can strike only from the center, therefore, the grooves are located differently. The grooves 9, in which the impactors are located, strike against the wall of the outer furrow, which is farther from the center, located around the circumference of the cones. The grooves 10 with the impactors, which are to strike at the wall of the outer furrow, which is located closer to the center, are shifted toward the center. This allows the strikers to be positioned in grooves 10, so that they strike strikingly on the surface from the outside along the upper corner of the furrow.

Electromagnetic windings reporting reciprocating movement to the striker of the electric hammer, together with the striker are enclosed in a housing placed on a hinge 8 located in the middle of the groove 9.10 or shifted in the direction of rotation of the faceplate 3, which depends on the structural and kinematic parameters of the actuator (frequency of rotation of the faceplate and strokes, striker length, energy ratio of forward and backward stroke of electric hammer, etc.).

The Executive body of the combine for mining development works as follows. A harvester is brought to the prepared face. The cones can be included simultaneously with the drummers or in advance. If the impactors and cones are turned on at the same time, the impactors first act on those places in the face where, during the operation of the cones, furrow walls appear, causing cracking or destruction of small volumes of rock due to crushing and chipping. As the grooves deepen, the impactors act on their walls and small adjacent sections of the bottom. This eliminates or reduces abrasion when the cone interacts with the furrow walls. If the cones are first turned on, then they cut the furrows into parts of the depth, then the drummers are turned on. They act on the walls of the furrow, separate small volumes of rock from them. This eliminates or reduces the abrasive wear of the cone when it interacts with the walls of an already cut groove.

The ridges between the furrows can be destroyed by one of the known methods — shearing or impact.

Compared with the prototypes, the method of impacting the face of the mine workings and the executive body of the combine to conduct workings reduce or eliminate the wear of the cutters when cutting grooves, which makes it possible to more widely use this progressive method of destroying the faces of the preparatory workings.

Claims (2)

1. A method of conducting mining preparation, comprising cutting annular grooves with cones, characterized in that, in order to increase the efficiency of rock destruction due to its preliminary attenuation, strikes are made along the circumferential lines of furrow formation. 2. The executive body of the combine for mining preparation, containing a faceplate, cones located on the faceplate around the circumference, characterized in that, in order to increase the durability of the executive body due to the increase of the life of the cones, it is equipped with percussion instruments located on the faceplate around the placement circumferences cones in arcuate grooves made on the faceplate, and the impactors are fixed by means of hinges with the possibility of rotation in the grooves.