SU1557317A1 - Device for forming slits in blasthole walls - Google Patents

Abstract

The invention relates to mining and is intended for drilling and blasting of mines. The goal is to enable the formation of helical slots and facilitate the removal of the device from the hole. The device comprises a housing (K) 1 with an end socket (TG) 2 for connection with a drill rod 3, which is capable of turning K 1 relative to the rod 3. On the outer surface K 1, carbide blades with cutting front 4 and rear 5 are located symmetrically with its longitudinal axis. parts in the form of prisms of triangular cross section with cutting edges (PP) lying on lines that do not intersect the longitudinal axis K 1 and intersect each other and the longitudinal axis K 1 at an angle α not exceeding 30 °. Parts 4 and 5 of the blade are fixed to the inserts 6, which are installed in the longitudinal grooves 7, made in K1. A guide jig 10 with ribs 11 is connected to the K1 end face of the opposite end of the cutting part prism adjacent to each blade. and facing the conductor 10, is located at an angle of 70 to 90 ° to the face of the prism parallel to the PP, and the second face of the prism adjacent to the PP is at an angle smaller than 70 °. The recesses 7 in K 1 on the TG 2 side are made with bottom projections - steps 12 with 10 surfaces inclined towards the conductor on which the inserts 6 can rest in the release position from the conductor 10. In the release position to the conductor of the insert 6 rest on the bottom of the undercut 7. In percussion drilling with an angle α of not more than 30 °, the blade works efficiently, forming a groove with a sharp tip. 2 hp f-ly, 3 ill.

Description

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with between themselves and the longitudinal axis K 1 at an angle o (not more than 30e. Parts 4 and 5 of the blade are fixed on the inserts 6, which are installed in the longitudinal grooves 7 made in K 1. With the face of K 1, the opposed TG 2, it is connected The jig 10 with the ribs 11. Each blade of the prism face of the cutting part, adjacent to the PP and facing the jig 10, is located at an angle of 70 - 90 ° to the prism edge parallel to PP, and the second edge of the prism adjacent to the PP is at an angle , Invention relates to mining, in particular to methods and devices for drilling and blasting pnyh workings, and can be used in the explosive blasting of minerals.

The aim of the invention is to provide the possibility of the formation of screw gaps and to facilitate the extraction

devices from bore-hole. I 1

FIG. 1 shows the device in the hole, general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 - carbide blade, transverse profile.

The device for forming gaps on the bore-hole walls includes a housing 1 in which an end slot 2 is made for mounting with an element of a drill rod 3. Carbide blades having front 4 and rear finishing 5 - cutting parts are fixed on inserts 6, which are mounted in longitudinal grooves 7 on the housing 1. The forward cutting part 4 is made on a smaller radius from the axis of the device than the rear finishing 5.

The carbide blades are installed on the outer surface of the body symmetrically about its longitudinal axis and have cutting parts in the form of prisms of triangular cross section with cutting edges lying on lines that do not intersect with the longitudinal axis of the body and intersect with each other and the longitudinal axis of the body at an angle of no more than 30 °. Each blade has a face A of the prism of the cutting part adjacent to the cutting edge and facing the jig,

shim 70 °; The recesses 7 in K 1 on the TG 2 side are made with bottom projections - steps 12 with 10 surfaces inclined towards the conductor on which the inserts 6 can rest in the release position from the conductor 10. In the release position to the conductor of the insert 6 rest on the bottom of the undercut 7. During impact drilling with an angle of Ј no more than 30, the blade works efficiently, forming a groove with a sharp tip. 2 hp f-ly, 3 silt

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located at an angle of 70 - 90 to the face of the prism, parallel to the cutting edge, and the second face, adjacent to this edge, at an angle less than 70 °.

Thus, the edges of the blade are asymmetrical with the plane passing through the center of the device and the cutting edge.

The inserts 6 are installed in the recesses 7 with the possibility of longitudinal movement and extension from the case of the ends 8 facing the socket 2, and are preloaded by the spring 9 on the side of the conductor 10 with the ribs 11. The recesses on the side of the end socket are made with bottom projections-steps 12 with inclined towards the conductor by the surfaces facing the inner surfaces of the inserts, and the latter are located with support on the inclined surfaces of the protrusions in the release position from the conductor and with the support on the bottom of the undercut in the release position to the conductor. the socket is made with the possibility of rotation of the housing relative to the drill rod.

The work is done next. Introduce the device with the rod 3 into the hole 13. Then turn on the drilling machine associated with the rod 3. The front part 4 of the carbide blade creates an advance slot on the wall of the hole, and the rear end 5 forms the desired recess profile and its size.

The device, due to shock loads and axial feed force, makes a forward movement, but the frictional force at the junction of the rod 3 and the device plus the arrangement of carbide blades that do not coincide with the direction of movement direct the profile recess along the longitudinal helix. The magnitude of the angle Ы in percussion drilling does not exceed 30 ° in the direction of rotation. At angles up to 30 °, the blade works effectively, a groove is formed with a sharp tip. At (30), the leading edge of the blade and the side surface in contact with the rock (side A) work. At 30C, a groove is formed in the form of a trapezoid as a result of shock loads, i.e. a material shift occurs at the apex of the concentrator but the projection of the lateral surface of the groove (side A) is directed at an angle close to 30 °. Under these conditions, the device quickly fails, it is possible that it is jammed and destroyed on lines not intersecting the longitudinal axis of the housing, which guides the jig connected to the end of the case, is opposed Allen socket, characterized in that, with

hole in the hole. When a longitudinal formation is made in order to allow the formation of a helical groove, the symmetric breaking of the screw slots, carbide position of the faces is not effective, because in connection with the impact, a shift towards the axis of the hole is possible (especially in broken rocks). To reduce the load-25 at an angle of no more than 30 ki to the side surface of the profile recess, carbide blades are made with asymmetric side edges. Side A having contact with

The blades are located with the intersection of the lines of cutting edges between themselves and the longitudinal axis of the body

, while the socket is made with the possibility of turning the body relative to the drill rod.

2. The device according to claim 1, having a different form during profiling, is made 30 in that each has an angle close to the straight line (p 70-90 °), which causes a great resistance of the material to turning the device to the longitudinal axis and forms

carbide blade face of the prism of the cutting part, adjacent to the cutting edge and facing the conductor,

profile recess with sharp top.

located at an angle of 70 - 90 to the gra- ,,. not a prism parallel to the cutting edge, and the second facet of the prism, adjacent to the cutting edge, is at an angle,

When creating a longitudinal screw 70.

grooves there is a problem of extracting 3. The device of p. 1, of tl and h a-

devices from a bore-hole, especially in violation of the situation, with the aim of lightweight rocks. When the device is removed in broken rocks rfa, the side surface and the rear edges of the blades (side B) act to move the inserts 6 off of the protrusion 12, therefore, with a sharp jerk of the insert 6, they are shifted to the front of the notches and the inserts are insulated into the undercuts, and the projections 12. Spring 9 centers the inserts and presses the end parts of the inserts to the step of the protrusion (wedge). The annular grooves on the inner surfaces of the inserts serve to compress the central rod forming the bottom surfaces of the recesses. After compressing the inserts, removing the device from the hole is not difficult. After removing the device, opening the inserts and resting them on the ledge,

The device is ready to profile the next hole.

Invention Formula

1. An apparatus for forming gaps in the hole walls, including a housing with an end socket for connection with a drill rod, mounted on the outer surface of the housing symmetrically with respect to its longitudinal axis carbide blades with cutting parts in the form of prisms of triangular cross section with cutting edges,

lying on lines that do not intersect with the longitudinal axis of the housing, which guides the jig connected to the butt end of the housing, the opposite end socket, characterized in that

the purpose of ensuring the possibility of the formation of screw gaps, carbide at an angle of not more than 30

the purpose of ensuring the possibility of the formation of screw gaps, carbide at an angle of not more than 30

The blades are located with the intersection of the lines of cutting edges between themselves and the longitudinal axis of the body

, while the socket is made with the possibility of turning the body relative to the drill rod.

2. The device according to claim 1, distinguished by the fact that

carbide blade face of the prism of the cutting part, adjacent to the cutting edge and facing the conductor,

device from the bore-hole, the body is made with longitudinal grooves and inserts for fastening carbide blades on them, mounted

5 in the recesses with the possibility of longitudinal movement and extension from the case of the ends facing the face socket, and spring-loaded relative to the housing from the conductor side;

Q undercuts on the side of the socket are made with bottom protrusions-steps with surfaces inclined toward the conductor facing the inner surfaces of the inserts, and the latter are located with support on the inclined surfaces of the protrusions in the release position from the conductor Egs on the bottom of the undercut in the position press to the conductor.

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Claims (3)

The claims ⁵ 1557317 alloy blades guide the profile recess along a longitudinal helical line. The value of the angle c / during impact drilling does not exceed 30 ° in the direction of rotation. At angles up to 30 ° the blade works efficiently, a groove is formed with a sharp peak. At c *> 30 ° the front edge of the blade and the side surface in contact with the rock (side A) work. At Y> 30, as a result of shock loads, the groove is formed in the form of a trapezoid, i.e. a shift of the material is observed at the top of the concentrator, but the projection of the lateral surface of the groove (side A) is directed at an angle close to 30 °. Under these conditions, the device quickly fails, possibly jamming and destruction in the hole. In the formation of a longitudinal helical groove, a symmetrical arrangement of the faces is not effective, since due to the impact, a shift towards the axis of the hole is possible (especially in disturbed rocks). To reduce the load of 25 ki on the side surface of the profile recess, carbide blades are made with asymmetric side faces. Side A, which has contact with the breed during profiling, is made at an angle close to a straight line (p> = 7090 °), which causes a high resistance of the material to turning the device to the longitudinal axis and forms a profile recess with a sharp peak. I When creating a longitudinal helical groove, the problem arises of removing the device from the hole, especially in disturbed rocks. When removing the device in disturbed rfa rocks, the lateral surface and the rear edges of the blades (side B) are affected by forces tending to move the inserts 6 from the protrusion 12, therefore, when the jerk is sharply jerked, the inserts 6 are shifted to the front of the grooves]. The inserts are recessed into the grooves, leaving ί from the protrusions 12. The spring 9 centers the inserts and presses the end parts of the inserts to the step of the protrusion (wedge). Ring grooves on the inner surfaces of the inserts serve to crimp the central rod forming the bottom surface of the grooves. After compression of the inserts, removing the device from the hole is not difficult. After removing the device, after spreading the inserts and resting them on the ledge, the opposite end socket, resulting in the fact that, with the possibility of obstructed slots, carbide 1. A device for the formation of gaps on the walls of the holes, comprising a housing with an end socket for connecting with a drill rod, carbide blades with cutting parts in the form of triangular cross-section prisms with cutting ribs lying on the lines mounted symmetrically with respect to its longitudinal axis not intersecting with the longitudinal axis of the body, the guide conductor connected with the end of the body, with the aim of the blade, the blades are located with the intersection of the lines of arrangement of the cutting edges between them and the longitudinal axis of the body. at an angle of not more than 30 °, while the end socket is made with the possibility of rotation of the housing relative to the drill rod. 2. The device pop. 1, characterized in that each carbide blade prism face cutting portion adjacent a cutting edge and facing the conductor is disposed at an angle of 70 - 90 ^minutes to the prism face parallel to the cutting edge and the second side of the prism adjacent to the cutting edge - at an angle less than 70 °. 3. The device of Claim. ^ Characterized in that, in order to facilitate the removal of the device from the borehole, the housing is made with longitudinal recesses and inserts for mounting carbide blades on them, mounted in the recesses with the possibility of longitudinal movement and extension of the ends facing the end nest, 'and spring-loaded relative to the casing from the side of the conductor, while the recesses from the side of the end socket are made with bottom protrusions-steps with surfaces inclined towards the conductor facing the inner surface the surfaces of the inserts, and are located with support on the surface of the protrusions in squeezing from the conductor n ^g from the bottom of the recess in the position from the last inclined position of the support on the compression to the conductor.