KR19990033119A - Double bit for single opening of furnace exit - Google Patents

Abstract

The present invention relates to a opening bit for opening the exit port for discharging the melt in the blast furnace of the steelworks, by combining a small diameter bit 30 having the same rotation center point to the tip of the large diameter bit 20 to reduce the excavation amount of the exit port The present invention relates to a double-bit opening for a furnace opening port for distributing the aperture bit 30 and the large-diameter bit 20 to reduce the wear of the bit to open the exit port at once without replacing the bit.

The effects include preventing the delay of departure time due to bit replacement and preventing safety accidents such as images caused by bit replacement.

Description

Double bite to drill the tap hole at bleast furnace

The present invention relates to the opening bit for opening the exit port for discharging the melt in the blast furnace, which is the main facility of the steelworks. This invention relates to a double bit for single opening of the Yonggwang Oh exit port, which increases the efficiency of the opening work by dividing the section into a large diameter bit and a small diameter bit.

Furnace is a facility that produces iron by reducing iron ore as a main equipment of steel making facilities.Alternatively, it is charged with iron ore and coke used as fuel and limestone used as a solvent. Main surface is heated to a high temperature of about 1600 ℃ by the heat of coke combustion.

The hot CO gas produced by the combustion of coke goes up into the furnace and causes a chemical reaction with iron ore to reduce the iron ore.

The molten iron reduced through the above-mentioned process is accumulated on the furnace with C and other impurities such as Si, Mn, P, and S, and the molten iron is moved through the turbidity and transported to the post process by opening the furnace exit. do.

As described above, in order to transport the melt in the molten state to the furnace in a later step, it is necessary to open the outlet of the furnace.

The exit port provided in the furnace is blocked by mud material, which is an amorphous refractory material, and a conventional opening port technology is coupled to the hook 141 formed on the outer wall of the furnace 140 on one side surface as shown in FIG. 1. Hook 112 is provided and the excavation rod on the rotating shaft coupled to the motor 120 coupled to slide along the guide rail 111 of the frame 110 is provided with a long guide rail 111 in the longitudinal direction ( 121 is coupled in parallel with the frame 110 and the motor 120 is operated after the hook 141 and the hook 112 are coupled using the opening machine 100 having the large diameter bit 20 coupled thereto. By rotating the large diameter bit 20 coupled to the excavation rod 121 to move the motor 120 is guided by the guide rail 111, the large diameter bit 20 drills the mud material 142 of the exit port A method of opening is used.

In addition, in order to remove the frictional heat generated by the friction of the bit during the excavation, the high-pressure nitrogen and cooling water are injected through the hole 21 formed in the center of the large diameter bit 20 to cool the frictional heat.

However, in the conventional method described above, a problem arises in that the excavation force is reduced due to severe friction of the large-diameter bit tip part at the opening of the exit opening. For the same reason, the large-diameter bit 20 is worn in a short time and needs to be replaced several times even when the opening port is opened once. There was a problem that the worker is a safety accident by the excavation rod.

In addition, when the biting force of the bit is weak so that the opening port can not be opened even during the bit replacement work, there was a problem that the oxygen opening work by blowing oxygen into the opening port.

Therefore, the technical problem to be achieved by the present invention is to provide a good excavation bit that can be excavated opening at one time without the need to replace the bit to solve the above problems.

1 is a perspective view of the excavation work of the opening machine equipped with a large diameter bit for opening a conventional exit port

2 is a perspective view of a small diameter bit

Figure 3 is a perspective view showing a combined state of the double bit provided with the present invention

* Description of the main symbols in the drawings

10: double bit 20: large diameter bit

21: coolant nozzle 21-1: spiral

22: Excavation discharge groove 30: Small diameter bit

31: coupling portion 31-1: through hole

31-2: Spiral 32: Cooling water jet

33: excavation discharge groove 100: open air

In order to achieve the technical problem to be achieved by the invention, the configuration is rotated coupled to the excavation rod coupled to the motor shaft, the center of the large diameter bit for opening the exit opening provided with a blast furnace cooling water injection port, the small diameter having the same center point at the tip of the large diameter bit It consists of forming a double bit combining the aperture bit. Hereinafter, described in detail with reference to the accompanying drawings.

A spiral 31-2 is formed on the inner circumferential surface of the cooling water injection port 21 formed at the center of the large diameter bit 20 and inserted into the cooling water injection port 21 and spirally coupled to the spiral 21-1. ) Is provided with a coupling portion 31 formed on the outer circumferential surface and consists of a small bit 30 having a cooling water injection hole 32 passing through the center and the coupling portion.

The following describes the operation.

When operating the double bit provided with the present invention coupled to the excavation rod 121 of the opening machine 100, when the motor 120 is advanced along the guide rail 111 provided in the frame 110 The excavation rod 121 coupled to the motor shaft according to the rotation of the 120 transmits the rotational force to the double bit 10 so that the double bit rotates and moves forward to excavate the mud material of the outlet.

At this time, the bit 10 is inserted into the cooling water injection port 21 provided in the distal end portion of the large diameter bit 20 in the process of digging the mud material is coupled to the spiral and the inside is made of a hollow body provided with a through hole 31-1 The small diameter bit 30 having the coupling part 31 connected to the cooling water injection port 32 of the small diameter bit 30 first drills the center portion of the mud material 142 to first form the small diameter drilling groove. The large-diameter ratio 20 at the rear end is excavated by dividing the excavation hole excavation cross section by digging around the small diameter excavation groove.

Therefore, the excavation amount of the large-diameter bit 20 is reduced, so that the wear of the bit is also reduced, so that excavation of the exit port can be performed without requiring replacement of the bit.

In addition, the excavated excavated by the bit through the hollow through-hole 31-1 provided in the engaging portion 31 of the small diameter bit 30 through the cooling water injection port 21 provided in the central portion of the large diameter bit It is discharged to the outside along the excavation discharge grooves 22 and 33, which are cutting grooves that form a bit by mixing with the coolant and the high pressure nitrogen, which are the bit coolant injected into the coolant injection port 32 of the small diameter bit.

Therefore, when the small diameter bit is combined with the large diameter bit, it is required to combine the excavation discharge grooves 22 and 33 to coincide.

The effect of the present invention is to divide the excavation area into two parts by dividing the excavation work by the small diameter bit coupled to the tip and the conventional large diameter bit, thereby reducing the excavation work of the large diameter bit and thereby reducing the wear rate without changing the bit at the opening opening. It is not possible to open the exit port by the bit by opening the exit at a time and reducing the time required for bit replacement, preventing the worker safety accident due to the high temperature of the bit when changing the bit, and improving the digging force of the bit. There is an effect of reducing the oxygen opening work.

Claims (2)

The small diameter bit having the same rotation center point at the tip of the large diameter bit 20 in the large diameter bit 20 for the opening of the blast furnace opening hole which is coupled to the excavating rod coupled to the motor shaft and provided with a cooling water injection hole 21 at the center thereof. Dual bit for the opening of the furnace outlet, characterized in that configured by combining (30). The method of claim 1, wherein the structure for coupling the small diameter bit 30 to the large diameter bit 20 is a cooling water injection port of the large diameter bit coupling portion 31 provided in the rear end of the small diameter bit 30 ( 21) Double bit for the opening of the furnace outlet opening, characterized in that the spiral coupling by inserting in.