KR100974230B1 - High-strength bits for opening the furnace exit - Google Patents

Abstract

The present invention is a cylindrical body 110 that is coupled to the tapping bar, a plurality of blades 120 formed to protrude out of the body, and a plurality of cemented carbide inserted into the tip coupling hole 140 formed in the blade In the high-strength bit for the furnace opening opening consisting of a tip 130, a central coolant drain hole 150 and a side coolant drain hole 160 for cooling the cemented carbide tip, the tip of the blade 120 is the body 110 The horizontal plane 121 close to the center of the horizontal plane 121 and the inclined surface 122 located on the outside of the horizontal plane 121, but the tip coupling holes formed in the horizontal surface 121 are all located on a different concentric line, the inclined surface 122 The tip coupling holes formed in the) to provide a high-strength bit for opening the furnace exit opening is configured to be located all on the same concentric line, the present invention is a carbide tip The structure and layout of the cooling water discharge hole are optimally formed in the opening of the furnace to improve the cutting force and to increase the cooling efficiency, thereby enabling the collective opening of only one tapping bar. It is a very useful invention that can secure safety and have improved productivity and cost savings.

Furnace, Exit, Opening, High Strength, Bit

Description

High strength cutting bit for blast furnace tap hole}

TECHNICAL FIELD The present invention relates to a bit for opening a furnace outlet, and more particularly to a high strength bit for opening a furnace outlet that enables to improve operation productivity through excellent cutting performance, shortening of working time, improvement of workability, and securing safety.

In general, the bit opening for the opening of the furnace is to open a high-strength mud material by mounting it on the tapping bar of the opening of the furnace, and is a very important facility related to the chartering of the steelworks blast furnace.

That is, the furnace (A) for producing iron in steel mill is composed of refractory bricks and various refractory materials to withstand high temperature heat of 1500 ℃ or more and contain molten iron.The iron ore is charged by charging iron ore, coke and lime and blowing hot air. During the reduction reaction to make molten iron, the molten iron accumulated at the bottom of the furnace should be periodically removed.

Therefore, as shown in FIG. 1, a tap hole (tap hole) is used to make a tap hole (D). The tap hole (D) is filled with a refractory mud material (E) to be blocked and a tapping bar ( C) is excavated by the opening machine (B) to be mounted and the molten iron is taken out after the opening. Opening for the embarkation should be carried out several times a day, the mud material (E) is a material that maintains the compressive strength and hardness even at high temperature, so in order to excavate this, a bit equipped with a carbide tip (Tip) mounted on the tip of the tapping bar Must be used.

As shown in FIG. 2, the conventional bit 1 includes a body 10, a blade 20 formed to protrude from the tip of the body, and a cemented carbide tip fixedly coupled to the blade 20. 30) and the cooling water drainage holes 40 and 50 for cooling the cemented carbide tip 30, in particular made of cast steel (SC), and three blades 20 are formed separately from the front end of the body. do. In addition, the tip of the blade 20 is fixed so that the cemented carbide tips 30 are protruded, respectively, and the cooling water passes through the tapping bar and the body so as to be discharged between the center of the body 10 and each blade 20.

The conventional bit 1 having the structure as described above is inevitably weakened while using a high-strength mud material for improving the productivity of the blast furnace in recent years, and thus, two or three bits are used to open the exit port once. It is necessary to use, and the increase of working time due to the replacement of them, as well as the safety of workers due to exposure of waste water and exhaust gas is seriously threatened, the development of higher strength bits is more urgent than ever.

Moreover, the conventional bit has to be opened while the hammering hole is difficult to be opened by drilling alone. The hammering impacts the blast furnace, resulting in a reduction in durability and cost of equipment and a decrease in productivity.

In particular, the conventional bit is that the carbide tip coupled to the tip of the blade is formed at the same position and height, the same angle, so that the area that is in close contact with the mud material during drilling, and the height of the tip end of the carbide tip to the mud material is also the same It has a disadvantage that the amount of heat generated is high.

In addition, due to the wrong structure of the drain hole, the cooling effect of the bit is remarkably decreased. In particular, the side coolant drain hole in the middle of the blades is disposed around the central coolant drain hole, and is accurately divided at a 120 ° angle. When the cooling water of about 13kg / cm 2 is supplied, it is sprayed forward by the water pressure instantaneously, so that the blade and the cemented carbide tip cannot be cooled, but are sprayed on the mud material.

Therefore, the cooling water ejected through all the cooling water drainage holes together with the central cooling water drainage hole for injecting the cooling water into the mud material is not very useful for cooling the actual direct bit body.

As a result, conventional carbide tips are difficult to excavate because they are overheated during drilling and are not damaged due to deterioration or concentricity during drilling, and they are opened by hammering when excavation is not possible by drilling alone. It has shortcomings such as shortening of time and unstable landing speed.

Therefore, the present invention was devised to solve the above problems, the present invention is to be divided into a horizontal plane close to the center of the body at the tip of the blade and the inclined surface located on the outside of the horizontal plane on the cemented carbide tip and the inclined surface Carbide tips are formed in different positions, heights, and inclination angles to improve cutting and cooling performance, improve the structure of the drain hole for cooling the carbide tips to reduce the amount of heat generated and improve the cutting force to prevent damage to the furnace, It is to provide a high-strength bit for the opening of the furnace opening that can secure the cost, work time, work safety by allowing the tapping bar to be opened by the tapping bar alone.

As such, the present invention forms the structure and arrangement of the cemented carbide tip and the coolant discharge hole in an optimal state in the opening of the furnace opening, thereby improving cutting force and increasing the cooling efficiency, thereby enabling the collective opening with only one tapping bar. Due to this, it is possible to secure work time and secure work, and it is a very useful invention having improved productivity and cost savings.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the present invention uses a high-strength bit 100 for the opening of the furnace outlet, and a cylindrical body 110 coupled to the tapping bar, and a plurality of blades 120 protruding outward from the body. ), A plurality of cemented carbide tips 130 inserted into and fixed to the tip coupling holes 140 formed in the blade 120, a central cooling water drain hole 150 and a side cooling water drain hole 160 for cooling the carbide tips. Is done.

In this case, the tip portion of the blade 120 is divided into a horizontal surface 121 close to the center of the body 110 and an inclined surface 122 located outside the horizontal surface 121, but the tip coupling hole formed in the horizontal surface 121 is All of them are positioned on different concentric lines, and the tip coupling holes formed in the inclined surface 122 are all configured to be on the same concentric line.

In this case, two of the tip coupling holes formed in the horizontal surface 121 are positioned in a straight line passing through the center of the body 110, but the inclination angle of one tip coupling hole is in a vertical state, and the inclination angle of the other inclination angle is 25 °. Has

In addition, the other two of the tip coupling holes formed in the horizontal surface 121 are formed spaced apart by the same interval in the opposite direction from the straight line passing through the center of the body 110, the inclination angle thereof is preferably in a vertical state. . At this time, the spacing is about 4mm from the straight line passing through the center of the body (110).

Two tip coupling holes formed in the inclined surface 122 are also positioned in a straight line passing through the center of the body 110, and the other two are identical in opposite directions from a straight line passing through the center of the body 110. It is to be formed spaced apart.

At this time, the spacing is preferably about 3mm from the straight line passing through the center of the body (110).

In addition, these inclination angles are all the same, and the inclination angle becomes a right angle state with respect to the inclination angle of the inclined surface 122. As shown in FIG. At this time, the inclination angle of the inclined surface 122 is most preferably 10 ~ 20 ° considering the cutting force of the carbide tip 130.

Of course, although the position and the inclination angle of the tip coupling holes are selected by the best case by repeated experiments, it will be obvious that the tip coupling holes may be formed in a position and inclination angle having a better opening effect.

In addition, the cooling water injection structure for cooling the cemented carbide tip 130 is also very important for opening the high-strength mud material, in the present invention for forming a central coolant drain hole 150 in the center of the body 110, the The central coolant drain hole 150 has a tapered shape that gradually narrows toward the coolant outlet 152 at the coolant inlet 151.

This is a structure for injecting the coolant at a higher pressure, wherein the side coolant drain hole 160 communicated from the central coolant drain hole 150 is braid 120 and the braid at a 30 ° angle with a vertical line passing through the center of the body 110. It has a structure perforated between 120.

In addition, the present invention is configured to form a coolant guide groove 170 connecting the central coolant drain hole 150 and the side coolant drain hole 160, that is, the braid 120 and the braid 120 at the front end of the body 110. It may be. This is a configuration for securing a space in which the coolant discharged from the central coolant drain hole 150 and the coolant discharged from the side coolant drain hole 160 communicate with each other in order to increase the cooling effect.

In the present invention, the number of blades 120 and the carbide tips 130 is not limited to the number for the most desirable opening, but for the stable opening of the blade 120 is four, the carbide tips 130 is made of eight Most preferred.

As such, according to the present invention, the carbide tips 130 have different positions and angles of inclination, thereby reducing the contact area with the mud material. To maximize cutting capacity.

In addition, the inclined surface 122 of the present invention, after the bit cutting the mud material, the drill is inserted into the outlet during the drilling, or wear or rotation does not rotate, the rotation resistance is generated, the rotation torque is increased and eventually the drilling stops to improve the work obstacles It is to make it possible.

When the open bit 100 of the present invention is tested on the existing mud material (MRC-5), the opening is performed in one or two minutes with only one, and the existing bit is opened in ten minutes on average and has a difference of several times. It can be seen that this is a much higher strength bit than the existing bit.

As described above, although the present invention has been described by means of a limited embodiment, the present invention is not limited thereto, and the technical idea of the present invention and the claims will be described below by those skilled in the art. Various modifications and variations are possible within the scope of equivalents.

1-Reference state of use of the conventional opening bit opening.

Figure 2-a perspective view of a conventional opening bit for opening.

3-a perspective view of the bit opening for opening the present invention port.

4-a top view of the present invention.

5-cross-sectional view for showing the side structure of the tip coupling hole in the present invention.

6-4 are cross-sectional views taken along the line V-V.

7-a plan view for showing a planar structure of the tip coupling hole in the present invention.

8-cross-sectional view for showing the structure of the drain hole in the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1: conventional opening bit

10: body 20: blade

30: carbide tips 31: tip coupling groove

40: central coolant drain hole 50: side coolant drain hole

100: high strength bit for opening of the present invention (hereinafter referred to as 'opening bit')

110: body 120: blade

121: horizontal plane 122: inclined plane

130: carbide tip 140: tip coupling hole (Hole)

150: central coolant drain hole 151: coolant inlet

152: cooling water outlet 160: side cooling water drain hole

170: coolant guide groove A: furnace

B: Opening machine C: Tapping bar

D: Exit E: Mud

Claims (4)

delete A cylindrical body 110 coupled to the tapping bar, a plurality of blades 120 protruding outward of the body 110, and inserted into the tip coupling hole 140 formed in the blade 120 is fixed Carbide tip is made of a plurality of 130, and the central coolant drain hole 150 and the side coolant drain hole 160 for cooling the cemented tip 130, the tip of the blade 120 of the body 110 The horizontal surface 121 close to the center and the inclined surface 122 located on the outside of the horizontal surface 121, and the tip coupling holes formed in the horizontal surface 121 are all located on the other concentric lines, the inclined surface 122 In the high-strength bit for the opening of the furnace exit opening is configured so that the tip coupling holes formed in the) are all located on the same concentric line, Two of the tip coupling holes 140 formed on the horizontal surface 121 are positioned in a straight line passing through the center of the body 110, but the inclination angle of one tip coupling hole is vertical, and the other inclination angle is 25 °. The other two are formed from the straight line passing through the center of the body 110 spaced apart from each other by the same distance from each other 4mm by the same interval, their inclination angle for the opening of the melting furnace characterized in that the vertical state High strength bits. A cylindrical body 110 coupled to the tapping bar, a plurality of blades 120 protruding outward of the body 110, and inserted into the tip coupling hole 140 formed in the blade 120 is fixed Carbide tip is made of a plurality of 130, and the central coolant drain hole 150 and the side coolant drain hole 160 for cooling the cemented tip 130, the tip of the blade 120 of the body 110 The horizontal surface 121 close to the center and the inclined surface 122 located on the outside of the horizontal surface 121, and the tip coupling holes formed in the horizontal surface 121 are all located on the other concentric lines, the inclined surface 122 In the high-strength bit for the opening of the furnace exit opening is configured so that the tip coupling holes formed in the) are all located on the same concentric line, Two of the tip coupling holes 140 formed on the inclined surface 122 are positioned in a straight line passing through the center of the body 110, and the other two are opposite from each other in a straight line passing through the center of the body 110. Are formed spaced apart by the same interval, spaced apart intervals are formed 3mm apart from a straight line passing through the center of the body 110, their inclination angle is characterized in that the perpendicular to the inclination angle of the inclined surface 122 High strength bit for piling opening. A cylindrical body 110 coupled to the tapping bar, a plurality of blades 120 protruding outward of the body 110, and inserted into the tip coupling hole 140 formed in the blade 120 is fixed Carbide tip is made of a plurality of 130, and the central coolant drain hole 150 and the side coolant drain hole 160 for cooling the cemented tip 130, the tip of the blade 120 of the body 110 The horizontal surface 121 close to the center and the inclined surface 122 located on the outside of the horizontal surface 121, and the tip coupling holes formed in the horizontal surface 121 are all located on the other concentric lines, the inclined surface 122 In the high-strength bit for the opening of the furnace exit opening is configured so that the tip coupling holes formed in the) are all located on the same concentric line, The central coolant drain hole 150 is formed at the center of the body 110, but the central coolant drain hole 150 has a tapered shape that is gradually narrowed toward the coolant outlet 152 at the coolant inlet 151 and the central coolant drain hole ( The side coolant drain hole 160 communicated from 150 is drilled between the braid 120 and the braid 120 at a 30 ° angle with a vertical line passing through the center of the body 110, and a central coolant drain hole at the tip of the body 110. High strength bit for the opening of the furnace, characterized in that configured to form a coolant guide groove 170 between the 150 and the side cooling water drain hole 160, the braid 120 and the braid 120.

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