KR100798001B1 - Center fixing type drilling rod of drilling apparatus for molten iron outlet of a blast furnace - Google Patents

Abstract

The present invention relates to an axial fixed type drilling rod in which an eccentricity does not occur in an excavation bit during an excavation operation in an opening machine used for digging a mud material that seals a molten iron outlet of a blast furnace.

Axial center fixed drilling rod of the furnace opening hole opening machine of the present invention, in the opening hole 1 of the outlet opening 121 of the furnace 120, the primary cutting edge 15 formed in a conical shape with a predetermined angle (A) intervals. ) And a first bit portion 13 consisting of a cylindrical primary departure preventing pipe 17 extending from the rear end of the primary cutting edge 15, the angle A at the rear end of the primary departure preventing pipe 17. Secondary bit portion 21 consisting of a secondary cutting edge 23 and a cylindrical secondary separation prevention pipe 25 extending from the rear end of the secondary cutting edge 23 with a spacing in the form of a truncated cone, and the 2 Excavation rod of the opening machine 1 at the rear end of the tertiary cutting edge 33 and the tertiary cutting edge 33 formed in the shape of a truncated cone with an angle A at the rear end of the vehicle departure preventing pipe 17 ( It consists of a tertiary bit portion 31 consisting of an inclined portion 35 extending to the shank 41 coupled to 9), the primary and secondary On the outer circumferential surface of the anti-detachment pipes 17 and 25 and the tertiary cutting edge 33, the crushing mud material conveying grooves 51, 53 and 54 are provided with an excavation bit 11 which is machined in the axial direction. It is done.

Therefore, according to the axial fixed type drilling rod of the present invention, since the excavation bit is composed of three stages, the eccentricity is suppressed by the excavation work itself, so that there is no fear of sagging on the excavating rod, so it is safe and convenient without additional work to prevent sagging. It is possible to carry out the opening of the exit.

Furnace, Blast Furnace, Exit, Opening Machine, Mud Material, Drilling Rod, Drill Bit, Cutting Edge, Eccentricity

Description

Center fixing type drilling rod of drilling apparatus for molten iron outlet of a blast furnace}

1 is a perspective view showing a state of use of a conventional furnace opening hole opening machine.

FIG. 2 is an enlarged partial cutaway side cross-sectional view of the outlet portion of FIG. 1; FIG.

Figure 3 is a perspective view showing in detail a conventional drilling bit.

Figure 4 is a front view of the exit port explaining the center deviation of the excavation bit for excavating the exit port.

Figure 5 is a perspective view showing in detail another conventional drilling bit.

Figure 6 is a partially omitted perspective view showing a state of use of the drilling machine applied excavation rod according to the present invention.

Figure 7 is a perspective view showing in detail the excavation bit of the excavation rod shown in FIG.

8 is a front view of the distal end of FIG. 7;

* Description of the symbols for the main parts of the drawings *

1: Opening machine 9: Excavation rod

11: Excavation bit 13,21,31: 1,2,3rd bit part

15,23,33: 1, 2, 3 cutting edge 17, 25: 1st and 2nd prevention pipe

35: inclined portion 41: shank

43: nitrogen gas and water supply lines 51, 53, 54: transfer groove                 

55,56,57,58: nitrogen gas and water supply hole 59,61,63: transfer space

120: furnace 121: exit

125: mud ash

The present invention relates to a blast furnace opening hole, and more particularly to the excavation bit of the excavation rod used to excavate the mud material sealing the exit port of the blast furnace discharged molten iron By manufacturing in three stages, the drilling bit itself has a center fixing function so that it is not necessary to add a separate operation to prevent the drooping of the drilling rod during excavation.

In general, a blast furnace used in a steel mill is provided with a plurality of outlets for discharging molten iron, that is, molten water, and each outlet is sealed with a mud material, which is a refractory material. Therefore, in order to allow the molten iron in the blast furnace to be discharged to the tap, it is necessary to remove the mud material blocking the tap opening, which is the tap opening machine.

This outlet opening is made of a frame 103 constituting the body, a transfer device 105 mounted on one end of the frame and a ring structure 107 attached to the other end, as shown by the opening machine 1 in FIG. In addition, the transfer device 103 is connected to the excavation rod 109 coupled to the internal drive motor, the excavation rod 109 extends toward the ring structure 107 along the frame 103 and the excavation bit at the tip 111 is mounted.                         

Therefore, in order to excavate the outlet 121 of the furnace 120 by the opening machine 101, the ring structure 107 of the aperture 101 is first opened before the excavation work. 120) It is fixed to the support 123 attached to the outer wall. Then, when the excavation work of the outlet opening 121 starts, as the drive motor of the conveying apparatus 105 rotates, the bit 111 rotates and the conveying apparatus 105 advances along the frame 103, and the outlet opening is performed. The mud material 125 blocking the 121 is excavated by the rotation of the bit 111, and at this time, a vent formed in the excavating rod 109 to reduce frictional heat generated at the excavation portion of the tip of the bit 111. Outside air supplied through (not shown) is injected to the excavation site of the bit 111. As such, once the tapping opening 121 is opened by the opening machine 101, the molten iron is discharged to the large bathway 127 through the tapping opening 121, and the opening area is gradually expanded to expand the tapping opening 121. Is opened.

However, when excavating the exit opening 121 by the conventional opening machine 1 as described above, since the excavation bit 111 is composed of a plurality of cutting edges 112 as shown in FIG. When the cutting pressure applied to the surface of the mud material 125 by each cutting edge 112 of the 111 is not uniformly maintained and either side is weakened, the bit 111 is caused to slip due to the rotational force and is shown in FIG. 4. As described above, since the shaft center is shifted from the center center 122 of the exit port 121 to the eccentric center 122 ', the starting hole 124' is formed at an incorrect position.

In order to solve such a problem, the Korean Utility Model Registration Application No. 1993-27270 has been filed by the present applicant, and according to the "opening opening opening bit with a center deviation prevention needle" disclosed in this application, As the center departure prevention needle 213 is attached to the excavation bit 211 as described above, the center departure needle 213 is squeezed to the exit opening center 122 of FIG. 4 to prevent sagging of the center. In this case, however, when the depth of the tap hole 121 is 2300 mm or more in average, the center deviation preventing needle 213 acts as a factor to lower the excavation force of the bit 211, and consequently, the opening machine used for the opening work. There was a problem causing a decrease in the digging performance.

The present invention has been proposed to solve the problems of the conventional opening machine drilling rod as described above, excavation bit is not excavated from the center of the exit port while excavating the exit mud material, the excavation bit is fixed to the axis itself by itself The purpose is to prevent the drilling bit eccentricity without adding a separate operation to support the drilling bit to prevent sagging by making a three-stage.

In order to achieve the above object, the present invention, in the opening of the opening of the furnace, consisting of a primary cutting edge formed in a conical shape with a predetermined angular interval and a cylindrical primary departure prevention pipe extending from the rear end of the primary cutting edge. 1st bit part, the 2nd bit part which consists of the secondary cutting edge formed in the shape of a truncated truncated cone at the rear end of the primary separation prevention pipe, and the cylindrical secondary separation prevention pipe extended from the rear end of the secondary cutting edge, and 2 It consists of a tertiary cutting edge consisting of a tertiary cutting edge formed in the shape of a truncated truncated conical shape at the rear end of the pipe for preventing the deviation of the pipe and a slope extending from the rear end of the tertiary cutting edge to the shank coupled to the drilling rod of the opening machine. On the outer circumferential surface of the primary and secondary departure prevention pipes and the tertiary cutting edge, there is an excavation bit in which crushed mud material feed grooves are machined in the axial direction. Provides a fixed shaft drilling rig rod of the furnace opening.

Hereinafter, with reference to the accompanying drawings, a shaft-type fixed excavation rod of the furnace opening hole opening machine according to an embodiment of the present invention in more detail as follows.

Excavation rod of the present invention is used to open the mud material (125) blocking the exit port 121 is discharged molten iron of the furnace 120, as shown in Figure 1 in Figure 1 As an excavation member of the opening machine 1, an excavation bit 11 is attached to the tip as shown.

Here, the excavation bit 11 is three bit portions 13, 21, and 31 in which the conical surface serving as the cutting edge and the cylindrical surface serving as the escape prevention tool intersect as shown in FIGS. 7 and 8. Consists of. Among these, the primary bit portion 13 at the very front of the excavation bit 11 that causes the mud material 125 to be broken is formed on the plurality of primary cutting edges 15 and the cutting edges 15 located at the tip. Consisting of the primary separation prevention pipe 17 formed in succession, the primary cutting edge 15 is protruded to have an overall conical appearance, the mud material 125 crushed between the cutting edge 15 to the outside A conveying space 59 for drawing out is formed, and as shown in FIG. 8, a constant angle A, for example, a distance of 120 ° is maintained. In addition, the primary departure preventing pipe 17 extending from the rear end of the primary cutting edge 15 extends in a cylindrical shape having the same diameter as the bottom surface of the primary cutting edge 15, the cutting edge on the outer peripheral surface ( 15, a feed groove 51 for conveying and discharging the fragments of the mud material 125 broken by the primary cutting edge 15 is processed in a long direction in the axial direction so that the transfer space of the primary cutting edge 15 59).

Similarly, the secondary bit portion 21 formed at the rear end of the primary bit portion 13 also has a separation preventing pipe for suppressing the center movement of the secondary cutting edge 23 and the drilling bit 11 used for cutting the mud material. It consists of 25, and has a diameter larger than the primary bit part 13 so that the opening area of the mud material 125 opened by the primary bit part 13 can be made larger. Here, the secondary cutting edge 23 located at the rear end of the anti-separation pipe 17 has the appearance of a truncated conical shape as a whole, and protrudes at the same angular position A at the same angular position as the primary cutting edge 15. It is. In addition, a transfer space 61 for extracting the crushed mud material 125 to the outside is also formed between the secondary cutting edges 23 and is connected to the transfer groove 51. The secondary departure preventing pipe 25 extending from the bottom of the secondary cutting edge 23 extends in a cylindrical shape to have the same diameter as the bottom of the secondary cutting edge 23, the transfer space 61 on the outer peripheral surface The crushed mud material conveying groove 53 connected to is long machined on the same angular position as the conveying groove 51.

Finally, the tertiary bit section 31 located at the rear end of the secondary bit section 21 also comprises a tertiary cutting edge 33 and an inclined section 35, as shown, where the tertiary cutting edge ( 33, like other cutting edges, extends from the rear end of the secondary departure preventing pipe 25 in the form of a truncated cone and has the same angular spacing A on the same angular position as the primary and secondary cutting edges 15 and 23. It protrudes so as to have, and the conveyance space 63 for extracting a crushed mud material is formed between each cutting edge 33 similarly. At this time, the front end of the transfer space 63 is connected with the transfer groove 53 of the secondary separation prevention pipe 25, and the transfer groove 54 for final extraction of the crushed mud material is processed at the rear jaw. . The inclined portion 35 successively formed at the rear end of the tertiary cutting edge 33 is gradually reduced in diameter and extends up to the shank 41 coupled to the drilling rod 9.

Then, as shown in FIGS. 7 and 8, the water supply and air supply line 43 for supplying nitrogen and water used for the excavation of the tap hole 121 (FIG. 1) is formed in the axis of the drilling bit 11. This line 43 extends long to the rear end of the primary cutting edge 15, and nitrogen passes through the tip of the transfer grooves 51 and 53 and the transfer spaces 61 and 63 at an arbitrary position. It is connected to the gas and water supply holes (55.57, 56, 58) through a separate branch pipe.

Now, the operation of the excavating rod 9 of the opening machine 1 of the present invention having the excavation bit 11 configured as described above is as follows.

Prior to the opening work of the outlet 121 of the furnace 120, as shown in FIG. 6, the drilling bit 11 is mounted on the tip of the drilling rod 9 of the opening machine 1. Then, when the opening work is started, the transfer device (105 in FIG. 1) is advanced so that the primary bit portion 13 of the bit 11 is aligned with the center of the tap hole 121. As such, when the drilling rod 9 is advanced, the nitrogen and water supply lines 43 are partially opened to rotate and drive the drilling rod 9 while supplying a small amount of nitrogen and water. The mud material 125 blocking the tap opening 121 is excavated by the car cutting edge 15. At this time, since the primary cutting edge 15 takes the form of a cone, it continues to excavate the same position without deviating from the first aligned center. Then, when the opening depth reaches or exceeds a predetermined distance, the primary surface is separated by the opening. As the prevention pipe 17 is guided, the drilling bit 11 is more reliably restrained from the center. Subsequently, when the drilling bit 11 advances, the opening opened by the primary bit part 13 is enlarged by the cutting edge 23 of the secondary bit part 21, and the secondary separation prevention pipe 25 By the third cutting edge 33 of the tertiary bit portion 31 guided into the enlarged opening by the primary opening diameter is expanded once again.

At this time, the mud material 125 crushed by the cutting edges 15, 23, 33 are applied to the injection pressure of nitrogen gas and water respectively injected from the nitrogen gas and the water supply holes 55, 56, 57, 58. Is discharged to the outside through the transfer groove (51, 53) and the transfer space (59, 61, 63), the excavation is continued with the nitrogen gas and water supply holes (55, 56, 57, 58) fully open Once the tap hole 124 of the small diameter as shown in FIG. 4 passes through the tap hole 121 and the mud material 125, no further drilling operation is performed. At this time, the molten iron, that is, the molten water flows out through the tap hole 124, and the mud material 125 around the melt is removed and thus the area of the opening portion of the tap hole 124 is gradually enlarged, and as a result, the tap hole 121 is completely completed. It will open and allow the charter discharge operation.

As described above, according to the shaft-type fixed drilling rod of the blast furnace opening machine according to the present invention, by using the excavation bit consisting of three stages of small and medium, the cutting resistance for the first cutting edge to apply the cutting pressure to the mud material first The drilling bit can be directly guided by the first departure prevention pipe immediately following the primary cutting edge, and then the first and second cutting edges and the secondary departure prevention pipe are used as the first Since it is possible to enlarge the starting opening opened by the cutting edge, it is possible to suppress the eccentricity of the excavating rod, that is, the deviation from the center during the excavation work of the starting hole by the opening opening.

Therefore, it is possible to effectively excavate the starting hole in the center of the exit without additional work to prevent the deflection of the excavation rod during the excavation work as in the prior art, thus increasing the amount of work of the operator or preventing burns Or it is possible to perform the opening of the exit port without fear of safety accidents such as gas poisoning.

Claims (2)

In the opening hole 1 of the tap opening 121 of the furnace 120, A primary bit portion 13 comprising a primary cutting edge 15 having a predetermined angle A and having a conical shape and a cylindrical primary departure preventing pipe 17 extending from a rear end of the primary cutting edge 15. ), The secondary cutting edge 23 formed in the shape of a truncated cone and having the angle A at the rear end of the primary departure preventing pipe 17 and the cylindrical secondary separation extending from the rear end of the secondary cutting edge 23. Secondary bit portion 21 formed of the prevention pipe 25, and the tertiary cutting edge 33 and the tertiary formed in the shape of a truncated cone having a distance (A) at the rear end of the secondary separation prevention pipe 25 The cutting edge as a whole consists of a tertiary bit portion 31 consisting of an inclined portion 35 extending from the rear end of the cutting edge 33 to the shank 41 coupled to the drilling rod 9 of the opening 1. Consisting of the conical surface and the cylindrical surface serving as the departure prevention mechanism consists of three-stage bit portion, the primary and On the outer circumferential surface of the secondary separation preventing pipes 17 and 25 and the tertiary cutting edge 33, there are excavation bits 11 in which crushed mud material conveying grooves 51, 53 and 54 are axially processed. An axis center fixed drilling rod, characterized in that. According to claim 1, The drilling bit 11 has a nitrogen gas and water supply line 43 is formed long along the axis to the rear end of the primary cutting edge 15, the feed grooves (51, 53) and the cutting edge (23) Axial center, characterized in that the plurality of nitrogen gas and water supply holes (55.57, 56, 58) connected to the supply line 43 through the front end of the transfer space (61, 63) between the 33, respectively Fixed excavation rod.

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