KR20220061852A - bit for drilling machine - Google Patents

Abstract

The objective of the present invention is to provide a bit for a drilling machine that can prevent damage to the tip due to a change in the excavation speed of the bit and can improve the excavation speed by minimizing the cutting area. According to the present invention, the bit for a drilling machine comprises: a first bit body having a hollow part; cutting tips installed at the end of the first bit body; and first flow prevention parts formed on an outer circumferential surface of the first bit body to prevent movement of the first bit body during a drilling operation by rotation and to cool the first bit body.

Description

bit for drilling machine

The present invention relates to a bit, and more particularly, to a bit for a perforator that forms a perforation hole to remove residual wire mixed with iron ore, coke, minerals, etc. it's about

In general, during the dismantling work of solidified debris, slag, carbon, methyl, etc. due to long-term operation of the blast furnace, it is blasted or cut with a ZET LANCE (oxygen cutting lance) by manpower and then taken out of the blast furnace. However, there is a problem in that the blasting effect is not great because the blast hole is wide and the depth is shallow when drilling by the jet lance.

In addition, when drilling with a jet lance, a large amount of toxic gas and soot causes serious environmental pollution and interference with adjacent work, and a lot of work is required due to low work efficiency.

Korean Patent Registration No. 10-10044451 discloses a method for blasting and dismantling debris in a blast furnace during a large-scale blast furnace repair work. The published method of blasting and dismantling the residual wire has a configuration in which a plurality of blast holes are vertically perforated in the residual wire, gunpowder is loaded in the perforated blast hole, and a detonation wire and a detonator are connected and blasted.

In the method of blasting debris as described above, the blast hole is drilled in a direction perpendicular to the wire, and since the residual wire is mixed with minerals such as iron ore and coke and slag, the drilling of the blast hole by the drilling machine cannot be performed smoothly. There is a problem.

In particular, when a bit is mounted on a perforator to drill fine lines, there is a problem in that the feed rate of the bit performing the drilling operation of the blasting hole is non-uniform, and the cutting load acts in one direction to cause severe vibration. This has a problem in that the excavation speed of the bit for perforation is slow, and the tip is easily damaged.

Republic of Korea Patent Registration No. 10-0982602 discloses a method of removing residual wire in a blast furnace. The posted demolition method removes the shell of the part that draws out the divided residual wire block, and divides and removes it using a wire cutter.

In the Republic of Korea Utility Model Announcement No. 1997-0002834, a drilling machine for fine wire of a blast furnace is posted. The posted fine wire drilling machine is provided with a drill bit having a cutting oil supply hole formed therein in the longitudinal direction to supply cutting oil.

As described above, supplying cutting oil to the drill bit has an effect of preventing bit deterioration in anticipation of the effect of cooling the bit, but cannot fundamentally solve the problems described above. In particular, since iron ore, minerals and coke are mixed inside the fine wire, the drilling speed of the drill bit is non-uniform, and the rotational load of the drill bit is non-uniform, so that the tip is easily damaged.

Korean Patent Registration No. 10-10044451 Republic of Korea Utility Model Announcement No. 1997-0002834 Republic of Korea Patent Registration No. 10-0982602

The present invention is to solve the above-mentioned problems, it is possible to prevent the tip from being damaged by the change of the excavation speed of the bit, and to provide a bit for a perforator that can improve the excavation speed by minimizing the rebar area. there is.

Another object of the present invention is to provide a bit for a perforator capable of preventing vibration of the bit being perforated by preventing the cut areas cut by adjacent tips of the bit from overlapping with each other.

A bit for a perforator of the present invention for achieving the above object is a first bit body having a hollow portion, and cutting tips installed at the end of the first bit body,

It is characterized in that it is formed on the outer peripheral surface of the first bit body to prevent the flow of the first bit body during drilling by rotation and includes first flow preventing parts for cooling the first bit body.

In the present invention, there is provided a second bit body having the hollow portion and coaxially screwed with the first bit body and having second flow preventing parts formed on the outer circumferential surface for preventing shaking with respect to the central axis of the punching. The first and second coolant flow grooves are respectively formed on the outer surface of the first and second flow preventing units at predetermined intervals in the circumferential direction, respectively, in the circumferential direction. In addition, a groove is formed on the cutting surface of each cutting tip so as not to overlap with the formation position of the groove formed on the cutting surface of the adjacent cutting tip. This means that the cutting area by the cutting tip does not overlap the cutting area of the adjacent cutting tip.

The bit for a drilling machine of the present invention can be drilled using a minimum cutting area when forming a crushing hole for providing the residual wire of a blast furnace, that is, a drilling hole, so that the drilling speed can be improved, and the vertical central axis for the formation of the drilling hole It is possible to prevent damage to the cutting tip due to abrupt changes in the excavation speed and partial cutting load by preventing the bit from shaking. In addition, since the core can be withdrawn like the bit when the bit is fetched after the bit is punctured, the interruption of the subsequent operation by the remaining core can be prevented.

In addition, by preventing the cutting areas cut by the cutting tips from overlapping with each other, vibration of the perforated bit can be prevented.

1 is an exploded perspective view of a bit for a perforator according to the present invention;
2 is a cross-sectional view of a bit for a perforator;
3 is a bottom view of a bit for a perforator;
4 and 5 are diagrams of the state of use of the bit for the perforator.

The present invention relates to a bit for a perforator, and an embodiment thereof is shown in FIGS. 1 to 3 .

Referring to the drawings, the bit 10 according to the present invention includes a first bit body 20 having a hollow part 21 and cutting tips 30 installed at the end of the first bit body 20 in the circumferential direction. be prepared The outer peripheral surface of the first bit body 20 prevents the first bit body 20 from flowing with respect to the central axis of the hole in which the first bit body 20 is drilled during the drilling operation by rotation, and provides a first for cooling the first bit body 20 . It includes flow prevention parts (25).

And a second bit body 50 coaxially screwed with the first bit body 20, and a core installed in the hollow part 21 of the first bit body 20 and perforated by the bit. A core withdrawing member (60) for drawing out is provided.

The bit for a perforator according to the present invention configured as described above will be described in more detail for each component as follows.

The bit body 20 according to the present invention has a hollow part 21 formed in the longitudinal direction, and a cutting tip mounting part 22 is formed at an end thereof. And an inlet groove 23 having a predetermined depth in the circumferential direction is formed on the outer peripheral surface of the cutting tip mounting portion 22 . And on the inner circumferential surface of the hollow part 21 on the side corresponding to the cutting tip mounting part 22 of the first bit body 20, a screw coupling part 24 is formed.

The cutting tip 30 coupled to the cutting tip mounting portion 22 is installed in a radial direction with respect to the central axis of the hollow portion, and may have a structure inclined at a predetermined angle with respect to the radial axis. The coupling of the cutting tip 30 to the cutting tip mounting portion 22 involves machining an inlet groove 23 from the end of the cutting tip mounting portion 22 in the longitudinal direction of the first bit body 20, and the inlet groove 23 ) after inserting the cutting tip 30 into the weld. An inclined surface 31 of a predetermined angle is formed on the upper surface of the cutting tip 30 coupled as described above, and the inclined surface 31 has grooves 32 spaced apart from each other at a predetermined distance in a direction parallel to the cutting direction. . The groove 32 is formed so as not to overlap the groove formed on the inclined surface of the adjacent cutting tip. This is to prevent the cutting edge 33 divided by the groove formed on the inclined surface of the cutting tip 30 from overlapping with the adjacent cutting edge.

In addition, a plurality of first flow prevention portions 25 inclined in the rotation direction of the bit are formed at regular intervals on the outer peripheral surface of the first bit body 20 . The first flow preventing part 25 has a structure protruding from the outer peripheral surface of the first bit body 20 to a predetermined height. In addition, a plurality of first coolant flow grooves 26 may be formed in the circumferential direction on the surface of the first flow prevention part 25 .

And the core take-out member 60 is installed on the inner circumferential surface of the first bit body 20, the cylindrical support portion 61 and a plurality of core take-out jaws extending from the support portion 61 to the cutting tip 30 side. (65) are provided. The hollow portion in which the core take-out member 60 is installed may have a tapered structure so that the core can be gripped by moving the core take-out jaw 65 to the inner shaft when the core take-out member 60 is lowered.

On the other hand, the second bit body 50 screwed with the first bit body 20 has a second hollow part (51). A plurality of second flow prevention portions 35 inclined in the rotation direction of the bit are formed at regular intervals on the outer peripheral surface of the second bit body 50 . The second flow prevention part 35 has a structure protruding from the outer peripheral surface of the second bit body 50 to a predetermined height. A plurality of second coolant flow grooves 36 are formed in the circumferential direction on the surface of the second flow prevention part 35 .

The bit for a perforator according to the present invention configured as described above is used by being coupled to the end of the rod rotating by the head of the perforator. The rod has a hollow portion to supply cooling water.

The bit for the perforator mounted on the rod of the perforator is advanced at a constant speed while the rod is rotated at a predetermined number of revolutions to form a perforation hole in the residual wire.

As described above, the bit 10 mounted on the rod of the perforator for perforating the fine line 100 forms a donut-shaped perforation hole 110 in the fine line 100 by the cutting tip 30 . That is, since the bit has a hollow part, the core 200 is formed in the drilling hole while the drilling is performed.

On the other hand, as long as it is mounted on the rod and forms a perforated hole in the wire 100, water for cooling is continuously supplied through the hollow part, and this water cools the cutting tip 10 and then the first bit body 20 It is discharged between the outer peripheral surface of the rod, the outer peripheral surface of the rod, and the inner peripheral surface of the drilling hole. During this cutting operation, the first and second flow preventing parts 25 and 35 maintain a state in contact with the inner circumferential surface of the drilling hole so that the bit 10 does not shake with respect to the central axis of the drilling hole.

In addition, while cutting is performed by the cutting tips 30 formed in the cutting tip mounting portion 22, the cutting portion by the cutting edge does not overlap the cutting portion by the cutting edge of the adjacent cutting tip 30 . Therefore, since all the cutting tips 30 perform the cutting operation of the fine lines, it is possible to increase the cutting efficiency.

In this process, cores such as iron, ore, coke, etc. are present in the residual wire 100 . In the process of cutting by the bit 10 , an unbalanced load due to a difference in cutting force acts on the bit 10 . . However, since the first and second flow preventing parts 25 and 35 are formed on the outer peripheral surfaces of the first and second bit bodies 20 and 30, it is possible to prevent the center of the drilling hole from shifting from the center of the bit, and further can prevent the cutting tip 30 from being damaged by the load difference of the sudden cutting force.

When a bit is drawn out like a rod after the drilling operation to penetrate the electric wire 100 is performed by the above operation, the core take-out jaws 61 of the core take-out member 60 are shown in FIGS. 4 and 5 . It is discharged in a state in which the core 200 is gripped as described above.

As described above, the bit for a perforator according to the present invention can improve the digging efficiency when forming a perforation arc for removing residual lines in the blast furnace, and the cutting tip of the bit 10 is caused by the difference in the cutting force acting on each cutting tip. (30) It can prevent damage.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will have to be determined by the technical spirit of the appended claims.

Claims (6)

A first bit body having a hollow portion, and cutting tips installed at an end of the first bit body;
A perforator bit formed on the outer circumferential surface of the first bit body to prevent the flow of the first bit body during drilling by rotation and includes first flow preventing parts for cooling the first bit body. The method of claim 1,
The bit for a drilling machine, characterized in that it further comprises a second bit body which is screwed coaxially with the first bit body and has second flow prevention parts formed on an outer peripheral surface to prevent shaking with respect to the central axis of the drilling. The method of claim 1,
A bit for a perforator, characterized in that the first and second coolant flow grooves spaced apart from each other by a predetermined interval in the circumferential direction are formed on the outer surface of the first and second flow prevention parts. 4. The method according to any one of claims 1 to 3,
A bit for a drilling machine, characterized in that a groove is formed on the cutting edge of each cutting team so as not to overlap with the formation position of the groove formed on the cutting edge of the adjacent cutting tip. The method of claim 1,
A bit for a perforator, characterized in that it further comprises a core withdrawing member installed on the first bit body to draw out a core formed during perforation. The method of claim 1,
The core take-out member is installed in the hollow portion of the first core body, and comprises a cylindrical support portion and a plurality of core take-out jaws extending from the support portion toward the cutting tip.

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