KR200391450Y1 - Drilling bit for tap hole of the blast furnace - Google Patents

Abstract

The present invention is a furnace opening opening bit consisting of a body having a cooling water outlet in the center and a plurality of blades having a carbide tip, the body is made of a cylindrical shape of the same diameter from the bottom to the top, The upper blade is formed so as to protrude from the upper end and the side end, the outer surface of the blade is formed with a vertical surface and an inclined surface, but the length of the vertical surface is to provide a bit for opening the furnace exit opening consisting of 8 ~ 12mm, The present invention minimizes the friction with the inner surface of the exit port and can be blown at once even in a weak pneumatic opening device, facilitates the discharge of the cut workpiece (mudd material), and the blade side too rapidly. It is a very useful design that can improve the shaking phenomenon of the bit during opening by preventing the wear.

Description

Drilling bit for tap hole of the blast furnace}

The present invention relates to a furnace opening bit, and particularly relates to a hole opening bit that is suitable for use in a pneumatic furnace opening device by firmly supporting a carbide tip while minimizing friction with a workpiece (mud material).

Furnace Outlet Opening Bit is for opening the outlet of the furnace using high strength mud material.It is attached to the end of the tapping bar of the hydraulic or pneumatic furnace opener and rotates to drill the mud material to open the outlet. Will be.

In other words, the blast furnace for producing iron in steelworks consists of refractory bricks and various refractory materials to withstand high temperature heat of 1500 ℃ or higher and contain molten iron.The iron ore, coke and lime are charged and the hot air is blown to reduce the iron ore. In the process of making the molten iron, the molten iron accumulated in the lower part of the furnace should be periodically removed.

Therefore, tapping holes are used to make tapping holes, which are filled with refractory mud materials and are excavated with openings for mounting and tapping bars to draw out molten iron after opening. Opening for the starting line should be carried out several times a day. The mud material is a material that maintains compressive strength and hardness even at high temperature, so in order to excavate it, a carbide tip (Tip) is attached to the tip of the tapping bar.

However, in recent years, the strength of the workpiece mud material has been significantly strengthened in order to enhance the productivity of the furnace, so that the previously developed cross-type opening bit cannot penetrate it, or it is necessary to use several bits to open the exit port once. In addition, the increase of working time due to the replacement of these parts and the safety of workers due to exposure of waste water and exhaust gas are seriously threatened. Therefore, the development of bits with higher strength, durability and easy opening are more urgent than ever. to be.

Therefore, the present inventors have developed and applied for a open bit that can be hit-free in one batch and was filed and filed as Utility Model Application No. 20-2004-19177.

However, the above-mentioned opening bit has a disadvantage in that the upper portion of the cylindrical body has a tapered shape, and thus the exposed portion of the blade from the body is large, and the supporting force by the body is not good. Therefore, when used in a hydraulic opening device having a large output, it has a very good opening performance, but when used in a pneumatic opening device with a weak output, the cutting force is lowered, the workpiece is not easy to discharge, the drilling performance is significantly reduced, and eventually digging In the meantime, the opening was stopped with an overload.

However, as in the conventional opening bit as shown in Fig. 1, the shape of the bit is completely tapered to almost eliminate the area of the bit in contact with the inner surface of the exit port. The gap between the and the bit is widened and the bit is not supported from the inner side of the exit port, thereby causing a tremendous tremor, which makes the opening difficult, and the device has a closed end that is easily damaged.

The present invention is devised to solve the above problems, and has a cylindrical body having a cooling water outlet in the center and having the same diameter from the bottom to the top, and a blade formed to protrude from the top and side ends on the body; However, by forming a vertical surface having a length of 8 ~ 12mm between the top surface and the inclined surface of the blade to minimize the friction between the blade vertical surface and the inner surface of the exit port, and facilitated the discharge of the cut mud material, too quickly Bits for opening the furnace opening to prevent the blade side from wearing out so that the side of the blade, ie the vertical surface, supports the inner side of the exit port more stably until opening is completed. To provide the purpose.

The present invention furnace opening opening bit 100 for achieving the above object has a cylindrical body 110 having the same diameter from the lower end to the upper end with a coolant outlet, and the upper end and side end portions on the body A blade 120 is formed to protrude, but the vertical surface 123 having a length of 8 to 12 mm is formed between the top surface 121 and the inclined surface 122 of the blade.

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

 The inventive furnace opening opening bit 100 has the same diameter from the bottom to the top in order to facilitate the discharge of the workpiece (mud material) when opening the furnace (C) outlet (A) as shown in FIG. It is formed to protrude from three to four blades 120 to the top and side of the cylindrical body 110 having.

The upper surface 121 of the blade 120 has a gentle inclination from the center to the outside, and the inclination angle α of the upper surface 121 is preferably 5 °.

In addition, the side of the blade 120 is composed of a vertical surface 123 and the inclined surface 122, the vertical surface 123 formed on the upper side by supporting the inner surface of the outlet (A) when the bit 100 is rotated This prevents shaking and prevents wear of the side of the blade quickly. At this time, the length of the vertical surface 123 is most preferably formed of 8 ~ 12mm.

As described above, in order to obtain the fact that the length of the vertical surface 123 is 8 to 12 mm is most preferable, the following experiment was conducted.

The components and physical properties, cooling quantity, and cooling capacity of the mud material component and the carbide tip 130 used in the experiment are shown in Table 1 below.

In Table 1 (compare the mud material components) MRC-3 is a conventional mud material and MRC-7-H3 is a high-strength mud material used in the experiment of the present invention.

In addition, the mounting bit 100 for opening the holes 100 formed differently between 5mm to 15mm in length of the vertical surface 123 of the inventive design 100, the opening device (D) as air pressure of 6Kg / cm A number of attempts to open the exit port A were made several times with the bit 100 having a diameter of 55 Ø with the forward and reverse speeds of 30 m / min, respectively, and the results are shown in Table 2.

Bit vertical plane length (mm) Bit diameter (Ø) Workpiece discharge degree Beat vibration Bit wear degree 5 55 ◎ ＃ ＃ 8 55 ○ ○ ○ 10 55 ○ ○ ○ 12 55 ○ ○ ○ 15 55 ＃ ◎ ◎

Excellent: ◎ Good: ○ Normal: △ Bad: × Very bad: ＃

As can be seen in Table 2, the bit 100 having the vertical surface 123 having a length of about 8 mm to 12 mm satisfies both the discharge amount of the workpiece, the degree of vibration of the bit, and the degree of wear of the bit, so that it is most suitable for opening of the exit port. The result was preferable.

In addition, the inclined surface 122 is formed from the end of the vertical surface 123, the inclined surface has a structure inclined inward, that is toward the body. The inclined surface 122 is a very important configuration for the discharge of the workpiece, wherein the inclination angle θ of the body and the inclined surface is preferably maintained to 30 °.

The length ratio of the vertical surface 123 and the inclined surface 122 preferably has a ratio of 1: 3 in order to facilitate the discharge of the workpiece and reduce the opening force.

In the upper surface 121 of the blade 120 of the inventive furnace furnace opening bit 100, two insertion holes 124 are formed at regular intervals so that two cemented carbide tips 130 are inserted and coupled to each other. At this time, the cemented carbide tip 130 has a cylindrical shape, and is separated into two in order to widen the cross-sectional area to improve the cooling effect, and the cemented carbide tip 130 may be formed in the body 110 as shown in FIG. 4. By sequentially spaced apart from the center by a predetermined interval, the cemented carbide tip 130 was configured to be arranged in a spiral shape. This is to prevent the next carbide tip from cutting the same part cut by the previous carbide tip again and again, that is, the next carbide when the position of the carbide tip 130 is at the same distance from the center of the bit body. The tips are cut to the place where the advanced carbide tips have passed, but the cutting effect is reduced, but when the carbide tips 130 are placed in a spiral, the next carbide tips 130 do not cut the next carbide tips 130 ), The cutting efficiency is significantly improved.

As such, the present invention minimizes friction with the inner surface of the exit port, and can perform a blow-free batch opening even in a weak pneumatic opening device, facilitates the discharge of the cut workpiece (mudd material), and the blade too rapidly. It is a very useful design that can improve the shaking of the bit during opening by preventing the wear of the side.

1-a perspective view of a conventional opening bit.

2-A cross-sectional view of a conventional open bit.

Figure 3-perspective view of the subject innovation opening bit.

4-a plan view of the subject innovation open bit.

5-4 is a sectional view taken along the line A-A.

Figure 6-Reference state of use of the present invention.

* Explanation of code for main part of drawing

1: conventional opening bit

100: the inventive open bit (hereinafter referred to as open bit)

110: body 111: cooling water discharge hole

120: blade 121: top surface

122: inclined surface 123: vertical surface

124: carbide tip inserting hole 130: carbide tip (Tip)

A: Exit B: Exit Inside

C: furnace D: opening device

a: vertical plane length b: slope length

Claims (2)

In the furnace opening port opening bit consisting of a body having a cooling water outlet in the center and a plurality of blades having a carbide tip, The body is made of a cylindrical shape of the same diameter from the bottom to the top, the upper portion of the body is formed so that the blade is protruded from the upper end and the side end, the outer surface of the blade is formed with a vertical plane and an inclined plane, but the length of the vertical plane Bit for opening the furnace outlet, which is composed of 8 ~ 12mm. The bit opening port opening of the furnace, characterized in that the ratio of the length of the vertical surface and the inclined surface in a ratio of 1: 3.