SU1176074A1 - Apparatus for forming concentric indentations in blast-hole walls - Google Patents

Abstract

1. DEVICE FOR THE FORMATION OF CONCENTRIC DEEPENING ON THE BALLS OF THE SIDES, comprising a housing with an axial purge channel and a junction with a drill rod, a working body and a drive for extending the working body, characterized by the fact that, in order to increase the efficiency of formation of dimples by combining the cutting process with the impact tool the working body, in the case are made symmetrically located relative to its longitudinal axis of the radial grooves, while the working bodies are made in the form installed in the grooves with The radial movement of the incisors with beveled surfaces on oppositely directed ends, the junction assembly is in the form of a stepped adapter, the lower stage of which is housed in the housing with the possibility of limited longitudinal movement, and the drive of the working device is coaxially mounted in the housing between the end face smaller (L stage of the adapter and incisors with the possibility of their separation when interacting with skoschennymi surfaces. 2. Device according to Claim 1, characterized in that the striker is spring-loaded relative to the housing from the incisors. 3. The device according to Claim 1, about which the cutting edge 9d of the cutters is made curved with increasing radius in the direction of rotation of the device. :

Description

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The invention relates to mining, in particular, to tools used by blast cutting of mine workings and during blasting of block stone from an array for applying concentric grooves of slots to bore-hole walls in a plane perpendicular to their longitudinal axis,

The purpose of the invention is to increase the efficiency. of the formation of recesses by combining the cutting process with the impact introduction of the working body

Figure 1 shows the device, the overall VID5 figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1, figure 4 - node 1 in figure 1.

A device for forming concentric recesses in the walls of the drill holes includes a housing 1, a connection unit with a drill rod 2 and a working body. The joint is made in the form of a step adapter 3, in the larger step 4 of which a tapered nest 5 is made, at a smaller step 6 - along the juice 7, which is pa located in the groove 8, made in housing 1, and limits the axial shaft. The placement of the step adapter 3 relative to the housing The combined rotation of the stepped adapter 3 with the housing 1 is accomplished by making conjugated surfaces.

9 corps 1 and a smaller stage 6 of adapter 3 in the form of a polyhedron. The working body is made in the form of incisors.

10 (in this case, four cutters) installed in the radial grooves 11 of housing 1 and interacting with beveled surfaces of the ends with a smaller step 6 of the adapter 3 by means of a striker 12 installed in the housing 1 coaxially.

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The impact movement of the cutters 10 in a plane perpendicular to the axis of the tool is limited by protrusions 13 made in the radial grooves 11 of the housing. In order to allow the tool to be removed after the formation of recesses in the bore-hole walls, the amount of movement of the impact tools should correspond to the expression

h 6- cog oi / 2,

where is the amount of movement of the cutter OS — the angle of the point; 6 - bevel line.

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In order to avoid jamming of the tool during operation, the cutting edge 14 of the cutters is curved with an increase in the radius in the direction of rotation of the body.

The contact of the striker 12 with the lower stage 6 of the adapter 3 is provided by the spring 15. The cleaning agent is supplied to remove the sludge from the bottom through the bores 16-18. For the removal of sludge in the body, longitudinal grooves 19 are made.

The device works as follows.

A tool is installed in the downhole part of the bore-hole, the impact of which is transmitted from the perforator by means of the drill rod 2. The adapter 3, which is mounted for movement relative to the tool body 1, transmits the impact effect to the striker 12. The striker 12, overcoming the resistance of the spring 15,

It has a pulsed impact on the cutters 10, which, advancing, strike the hole wall (not shown), buried in the array. After striking, the incisors 10 are rotated together with the body 1 by making the mating surfaces 9 of the small stage 6 of the adapter 3 and the body 1 in the form of a polyhedron. In this case, a concentric groove is cut into the walls of the hole.

and spinning (as the body turns) the cutters into the body, and then the striker, until the next blow is struck.

Since the torque of the percussion rotary drilling tool (perforator) is limited, to facilitate the pressing of the incisors inside the casing, their cutting edge is made with

an increased radius of curvature in the direction of rotation of the body, and the striker is spring-loaded relative to the body from the cutters. At the end of the work tool is removed from the hole. The cleaning agent is supplied to the working body over the entire period of operation of the tool through the grooves 16-18, and in addition to removing the sludge, the working units are cooled.

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Claims (3)

1. DEVICE FOR THE FORMATION OF CONCENTRIC DEPTHS ON THE WALLS OF THE HOURS, including a body with an axial purge channel and a unit, connections with a drill rod, a working body and a drive for extending the working body, characterized in that, in order to increase the efficiency of the formation of recesses by combining the cutting process with impact the introduction of the working body, in the housing are made symmetrically located relative to its longitudinal axis radial grooves, while the working bodies are made in the form of installed in the grooves with the possibility of the movement of cutters with beveled surfaces at opposite ends, the connection node is in the form of a step adapter, the smaller step of which is placed in the housing with the possibility of limited longitudinal movement, and the drive of the extension of the working body is in the form of a striker, coaxially mounted in the housing between the end face of the smaller step of the adapter and incisors with the possibility of their separation when interacting with beveled surfaces. 2. The device according to claim 1, characterized in that the firing pin is spring-loaded relative to the body from the side of the cutters. 3. The device pop 1, characterized in that the cutting edge of the cutters is made curved with increasing radius in the direction of rotation of the device.