JP3017016B2 - Blast furnace taphole opening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a taphole opening machine for opening a taphole of a blast furnace.

[0002]

2. Description of the Related Art With respect to an intermediate rod receiver of a taphole opening machine, there are a technique described in Japanese Utility Model Application Laid-Open No. 58-83440 and a technique described in Japanese Utility Model Application Laid-Open No. 58-56852.
In these techniques, an L-shaped rod support piece having a rod receiving groove is fixed below an intermediate carriage that travels while being supported by a guide channel, and the rod support piece is used to intermediate the longitudinal direction of the opening rod. By supporting the part from the lower side of the rod, supporting the deflection due to the weight of the rod, limiting the deflection of the rod to the left and right by the rod receiving groove,
This has the effect of making the cone attached to the rod end go straight.

[0003]

When drilling a taphole of a blast furnace, a taphole attached to the rod end is pressed against a mud by a taphole drilling machine, and the drill is hit and rotated through the rod. Drill the mud. Although this hole opening method has been conventionally used, sometimes holes cannot be opened (holes cannot be opened). In order to solve the impossibility of perforation, the capability of the drifter was increased to increase the pressing force and the impact force of the rod. However, the result was that the rod was buckled or bent, and impossibility of perforation was not improved. As a result of reexamining the strength of the rod from this phenomenon, it became clear that the conventional rod was insufficient in strength to efficiently transmit the force generated by the enhanced drifter to the cone as the axial force of the rod.

[0004] Generally, a tap hole to be opened has an opening diameter of 50 mm and a length of 3 m, and a rod for opening holes of this size has an outer diameter of 40 mm and an inner diameter of a blow passage of 20 m.
m, about 5 m in length. An elongated rod with this constrained dimension, when transmitting axial force, has a buckling phenomenon in which the middle of the rod length bends,
Even for rods of the same cross section, the axial force that can be transmitted is very small for rods of short length. According to the present invention, when the rod pressing force and the striking force are increased by increasing the capacity of the drifter, the large axial force generated by the drifter buckles the elongated rod having a dimensional restriction, and efficiently reduces the large axial force generated by the drifter. An object of the present invention is to provide a taphole drilling hole that solves the problem that the impossibility of drilling is not improved because the drilling hole cannot be transmitted to the drill well.

[0005]

In order to achieve the above-mentioned object, a blast furnace taphole drilling machine according to the present invention is arranged so that the entire circumferential direction of the drilling rod is substantially at an intermediate position in the longitudinal direction of the rod. A plurality of divided levers constrained with a small gap, a link mechanism configured to open and close the lever in a direction perpendicular to the longitudinal direction of the guide channel, and a lever opening / closing drive actuator; A rod core intermediate restraining device that allows the lever for use to be restrained and released by the lever is mounted on a bogie that can travel in the longitudinal direction along the guide channel.

In addition, a chain sprocket is rotatably mounted on a carriage on which the rod core intermediate restraint device is mounted, and a fixed chain laid in a longitudinal direction of the guide channel and a feed chain for running a drifter are mounted. The chain sprocket is interposed therebetween, and the bogie to which the rod core intermediate restraint device is assembled always travels half the travel distance of the drifter.

[0007]

According to the rod core intermediate restraining device of the present invention, the rod restraining lever can be opened and closed by the link mechanism and the lever opening and closing drive actuator. When attaching or removing a rod from a taphole drill, the rod is long and needs to be moved in the lateral direction of the guide channel. When the rod restraining lever is opened, the lateral direction of the lever is opened, so that the rod can be moved laterally from this space, and the rod can be attached or detached. After attaching the rod to the tap hole drilling machine, close the rod restraining lever of the rod core intermediate restraining device. Restrain with a gap. Since the lever is made of steel with a thickness of 10 mm or more and has sufficient strength, the rod will bend at the middle position in the longitudinal direction of the rod when opening when the rod tries to buckle by receiving the axial force from the drifter. When it occurs, it is constrained not to allow displacement. Since the lever restrains the entire circumferential direction of the hole-forming rod with a small gap, the lever does not hinder rotation and advancement of the rod during hole-making.

In addition, a chain sprocket is rotatably mounted on a carriage on which the rod core intermediate restraining device is mounted, and a fixed chain laid in the longitudinal direction of the guide channel and a feed chain for running the drifter. Since the chain sprocket is interposed therebetween, when the drifter travels, the chain sprocket travels １ ／ of the travel distance of the drifter according to the principle of a moving pulley. The bogie to which the rod core intermediate restraint device is mounted has the chain sprocket rotatably mounted on the bracket, so that the traveling of the chain sprocket can always travel half the travel distance of the drifter. By the above operation, the rod core intermediate restraining device produces the effect of shortening the buckling length of the rod at the time of opening to half that when the device is not installed, and increases the buckling strength of the rod by four times. Then, when the capability of the drifter is increased to increase the rod pressing force and the striking force, the large axial force generated by the drifter is efficiently transmitted to the drill to solve the difficulty in opening.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment. FIG. 1 is an overall side view of a tap hole drilling machine provided with a rod core intermediate restraining device of the present invention, and FIG. 2 is a front view of the rod core intermediate restraining device as viewed from the rear along a line AA in FIG. FIG. 3 is a front view showing a state where the lever of the rod core intermediate restraining device is opened. When the lever 13 of the rod core intermediate restraining device 8 is opened by the link mechanism 14 and the air cylinder 15 which is a lever opening / closing drive actuator (FIG. 3), the rod 1 having the tip 2 mounted on the tip thereof is located beside the guide channel 4. It is carried to the position directly below the guide channel from the direction and attached to the drifter 3. The rod 1 is mounted on the drifter 3 at the rear end and supported at the distal end by the rod receiver 7, and the lever 13 of the rod core intermediate restraining device is opened (FIG. 3) and the lever 13 is closed (FIG. 2). Are restricted with a small gap in the entire circumferential direction.

FIG. 1 shows a state immediately before starting the tap hole opening. The drifter 3 is advanced by the feed motor 5 toward the tap hole 17 through the feed chain 6 while hitting and rotating the rod 1, and the cone 2 is turned.
The opening starts at the time when the number 7 is hit. When opening, rod 1
Tries to buckle due to the large axial force generated by the drifter, but is restrained with a small clearance in the entire circumferential direction of the rod with the lever 13 closed (FIG. 2) by the rod core intermediate restraint device. Therefore, it cannot be buckled or bent.
Each part that constitutes the rod core intermediate restraint receives a reaction force in the direction perpendicular to the axis of the rod from the rod when restraining the buckling and bending loss of the rod, so it must be designed to maintain sufficient strength, The lever opening / closing drive air cylinder 15 has an ability to hold a reaction force in the direction perpendicular to the axis of the rod.

As shown in FIG. 2, the carriage 10 to which the rod core intermediate restraining device 8 is assembled is mounted on the guide channel 4 via wheels 16 and has a structure capable of traveling. A chain sprocket 11 is rotatably mounted on a carriage 10 with a bracket 12, and the chain sprocket is sandwiched between a fixed chain 9 laid in the longitudinal direction of the guide channel 4 and a feed chain 6 for running a drifter. Therefore, when the drifter travels, the chain sprocket 11 travels half the travel distance of the drifter according to the principle of the moving pulley. The bogie to which the rod core intermediate restraint device is mounted has the chain sprocket rotatably mounted on the bracket, so that the traveling of the chain sprocket can always travel half the travel distance of the drifter.

The present embodiment has been described with respect to a case in which the bogie to which the rod core intermediate restraint device is assembled can always travel half of the travel distance of the drifter. The running structure of this bogie is an essential requirement of the present invention. Rather, for example, when the drifter retreats, the bogie on which the rod core intermediate restraint device is assembled is pushed backward by the steel piece protruding from the feed chain, and when the drifter retreats, the bogie moves to the middle position of the rod length. A structure is also applicable in which the bogie can move freely when the drifter moves forward.

[0013]

According to the taphole drilling machine provided with the rod core intermediate restraining device of the present invention, the effect of shortening the buckling length of the rod at the time of drilling to １ ／ of the case where the device is not installed is reduced. The buckling strength of the rod was increased by a factor of four, the large axial force generated by the drifter was efficiently transmitted to the cone, and the hole could not be opened. Due to the above effect, the success rate of one-shot drilling by the drill is improved, so that the frequency of oxygen drilling, which is a measure taken when the drilling cannot be performed conventionally, is reduced, and high-temperature molten material scattering at the time of oxygen drilling is performed. The danger of burn accidents has been reduced.

Further, since the strength of the rod for efficiently transmitting the axial force generated by the drifter to the cone is increased four times as compared with the conventional one, the one-shot opening of the high compression strength mud cone having excellent hot metal erosion resistance is provided. The difficulty was solved and the use of a mud with high compressive strength became possible, so that the number of tappings could be reduced, and the tapping cost was reduced and the work before the furnace was reduced.

[Brief description of the drawings]

FIG. 1 is an overall side view of a taphole opening machine provided with a rod core intermediate restraining device of the present invention.

FIG. 2 is a front view of the rod core intermediate restraining device as viewed from the rear.

FIG. 3 is a front view showing a state where a lever of the rod core intermediate restraining device is opened.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rod 2 cone 3 lifter 4 guide channel 5 feed motor 6 feed chain 7 tip rod receiver 8 rod core intermediate restraint device 9 fixed chain 10 trolley 11 chain sprocket 12 bracket 13 lever 14 link mechanism 15 air cylinder 16 wheel 17 taphole

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Yoneda 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Department (58) Fields surveyed (Int. Cl. ⁷ , (DB name) C21B 7/12

Claims (2)

(57) [Claims] 1. A taphole drilling machine for tapping a taphole of a blast furnace, wherein a plurality of tapping holes are restrained at a substantially intermediate position in a longitudinal direction of the drilling rod with a small circumferential gap therebetween. A divided lever, a link mechanism configured to open and close the lever in a direction perpendicular to the longitudinal direction of the guide channel, and a lever opening / closing drive actuator, wherein the hole-forming rod is restrained by the lever and A blast furnace taphole drilling machine characterized in that a rod core intermediate restraint device capable of releasing restraint is mounted on a bogie capable of running in a longitudinal direction along a guide channel. 2. The blast furnace taphole drilling machine according to claim 1, wherein a chain sprocket is rotatably mounted on a bogie to which the rod core intermediate restraint device is mounted,
The chain sprocket is sandwiched between a fixed chain laid in the longitudinal direction of the guide channel and a feed chain for running the drifter, and the bogie with the rod core intermediate restraining device is always half the travel distance of the drifter. A blast furnace taphole drilling machine characterized by running on a blast furnace.