JP3155999B2 - Tapping Bit Repair Bit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair bit used for repairing a tapping gutter for discharging hot metal from a taphole of a blast furnace.

[0002]

2. Description of the Related Art Hot metal flowing out of a tap hole of a blast furnace is taken out to another place through a tapping gutter connected to the tap hole. The inner surface of this tapping gutter is coated with a castable type refractory material, but this coating layer is eroded by hot metal or slag, and thus needs to be repaired periodically. This repair work is carried out by destroying the deteriorated old coating layer and coating it with a new refractory material. The old coating layer is destroyed after the tapping gutter temperature has dropped. However, there is a problem that dust is generated frequently and workability and efficiency are poor due to high temperature. In order to improve this, a repair method using a rock drill and a rock bit has been attempted. As one of such devices, a rock drill rocking along a cross section of a gutter is used as a crushing tool. Has been proposed (Japanese Patent Application Laid-Open No. Sho 62-4808).

[0003]

However, when the rock bit is used by attaching it to a rock drill, the carbide tip constituting the blade of the lock bit is mainly implanted only near the front surface of the bit. Therefore, it has been difficult to destroy the deteriorated layer on the side wall surface of the gutter. In addition, where only the deteriorated portion of the tapping gutter needs to be crushed, the portion that has not been deteriorated is often crushed excessively. On the other hand, the crushing tool described in the above-mentioned Japanese Patent Application Laid-Open No. 62-4808 is
A large number of cylindrical blades are fixed to the head and outer periphery of a hemispherical blade body. However, such a tool has a poor cutting performance because the blade is spherical and not sharp. If a part of the body falls off or is damaged, the entire tool must be replaced, which is uneconomical. Therefore, the present invention can efficiently crush the coating layer on the inner surface of the tapping gutter, and can replace only the damaged part even if a part of the part such as the blade body is damaged. It is an object to provide effective tools.

[0004]

In order to solve the above problems, the present invention employs the following configuration. That is,
A tapping gutter repair bit according to the present invention includes an adapter having a fitting hole in which a rod for transmitting rotational force and thrust is fitted at a rear end portion, and a tubular fitting portion provided at a front portion. A plurality of detachable plate-shaped bases fitted to the fitting portion of the adapter, and a blade body having a sharp cutting edge detachably attached to an outer peripheral portion of the base. And

[0005]

This bit is used by being fitted to the tip of a swingable rod attached to a rotary cutting device that gives a rotating force and a thrust. When the bit is pressed against the deteriorated coating layer while rotating, the coating layer is crushed by the sharp cutting edge of the bit. Since the blade is detachable from the base and the base itself is detachable from the adapter, this bit is used when a part of the blades is damaged or when a part of the base is damaged. If is damaged, without replacing the entire bit, it is economical because that can be replaced every blade or base metal and the damage.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below. Each figure in FIG. 1 and subsequent figures represents one embodiment of the present invention.
This taphole repair bit 1 has a steel adapter 2 at its base.
It has. The adapter 2 is provided with a screw hole 3 which is a fitting hole for fitting a rod at a rear end portion, and a flange portion 5 which protrudes in a diametric direction at an intermediate portion. The front surface 5a of the flange portion 5 is formed as a flat surface, and the front side thereof is a cylindrical fitting portion 6. A screw portion 6 a is provided at the tip of the fitting portion 6. A blower penetrating from the bottom of the screw hole 3 to the front end of the core of the adapter 2 is provided.
A hole 7 is provided. Further, a side blowhole 8 which is branched from the blowhole 7 and is opened on the outer peripheral surface of the fitting portion 6 is formed in an intermediate portion of the fitting portion 6. In addition,
The flange portion 5 is provided with a notch 9 through which a pin for fixing the base metal is inserted.

The first base 1 is attached to the fitting portion 6 of the adapter 2.
0, a second base 11, and a third base 12 are fitted in order. As shown in FIGS. 4 and 5, the first metal base 10 is provided with a hole 15 for fitting in the center of a disk-shaped steel body.
A mounting hole 13a for fixing a pin is provided on the outer back surface side, and the pin 13 is fitted in the mounting hole 13a.
A pin hole 14 penetrating from the front to the back is provided on the concentric circle. In addition, a total of five groove-shaped notches 1 are provided on the plate surface of the base metal.
6, ... are provided. The notch 16 is provided with a step-like fixing portion 17 at the middle between the front and back sides, and the bolt hole 1 is formed in this portion.
8 are provided.

The second metal base 11 has almost the same shape as the first metal base as shown in FIGS. 6 and 7, but is provided with an enlarged diameter portion 15a at the front and back intermediate portion of the fitting hole 15. The difference is that a blow hole 19 that opens from the portion to the outer peripheral surface is provided, and that the pin hole 14 that penetrates the front and back is not provided. The other parts are the same as the first base metal, and thus the same parts are denoted by the same reference numerals.

As shown in FIGS. 9 and 10, the third base 12 is formed in a cap shape thicker than the first and second bases, and a fitting portion of the adapter 2 is provided at a central portion on the back side. 6 is provided with a fitting hole 20 into which the distal end is fitted, and a screw portion 21 with which the screw portion 6a of the adapter 2 is screwed is provided on the inner peripheral surface of the fitting hole. A blowhole 22 penetrating from the fitting hole 20 to the front side is provided in the core. This notch has five notches 2 having a shape similar to that of the first and second notches.
5,... Are provided. The notch 25 is provided with a fixing portion 27 having a bolt hole 26 similar to that described above. Furthermore, at the position of the notch 25, a wide upper notch 30 having a fixing plane 31 perpendicular to the plate surface is provided on the front side of the notch.

A first blade body 35 attached to the first metal base 10 is provided at a tip end of a steel shank 37 provided with a U-shaped groove-shaped concave portion 36 into which the fixing part 17 of the metal base is fitted. A cutting edge 39 of a cemented carbide tip having a sharp cutting edge is brazed, and a through hole 38 for bolt insertion is formed at a position of a concave portion of the shank 37. Further, the second blade body 40 attached to the second base metal has a sharp edge portion including the cutting edge 41 of the carbide tip slightly inclined with respect to the center axis in the front-rear direction of the bit. , But the other parts are the same.

Further, the third blade 45 attached to the notch 25 of the third metal base 12 is slightly different in dimension, but is similar in shape to the second blade 40 described above. So
Similar parts are denoted by the same numbers. Further, the fourth metal member attached to the upper notch portion 30 of the third
Blade body 50 is attached to the shank 51 by the front surface 12 of the third base metal.
The cutting tool has a front cutting edge 52 of a carbide tip protruding forward from a and an outer peripheral cutting edge 53 for cutting the outer peripheral surface, and each of these cutting edges has a sharp cutting edge. The U-shaped groove-shaped concave portions such as the first, second, and third blades are not provided in the shank 51, and a bolt hole 54 is provided in the center of the shank.

The first, second and third blades 35, 4
The reference numerals 0 and 45 are attached by fitting the groove-shaped concave portions of the shank into the fixing portions of the first, second and third base metals and fixing them with bolts 55. If this bolt is loosened, the blade can be removed from the base. In addition, the fourth blade body 5
Numeral 0 is bolted to the flat surface 31 of the upper cutout 30 of the third metal base 12. The base metal to which each blade body is attached in this manner is attached to the adapter 2 in the first, second, and third order. In this case, the first base 10 is provided with the pin 13 fixed to the rear surface side by the notch 9 of the flange portion 5 of the adapter.
And the pin 13 of the second base metal 11 is fitted into the pin hole 14 of the first base metal. The free rotation of the bases 10 and 11 is restricted by these pins 13. The third metal base 12 is attached by screwing the screw portion 21 to the screw portion 6a of the adapter. When removing from the adapter 2, remove from the third base in order.

[0013] The repair bit 1 is a rod 6 attached to a rotary cutting device supported so as to be swingable along the section direction of the tapping gutter and to be movable along the longitudinal direction of the tapping gutter.
0 is used by attaching to the tip. The attachment of the bit 1 to the rod 60 is performed by screwing a threaded portion of the rod into the screw hole 3 of the adapter 2. When the bit 1 is pressed against the repaired portion while being rotated in the direction of the arrow (clockwise in the figure) by the rotary cutting device, the refractory material in that portion is cut and crushed. During this time, blow holes 19 and 22
The air is discharged from the nozzle to cool the cutting edge and remove cutting chips.

Since the bit 1 is used for crushing refractory materials having high abrasion at high temperature, the cutting blade and the base metal are easily damaged by use. It is economical because only parts can be removed and replaced. In addition, since crushing is performed mainly by cutting with a sharp cutting edge, repair work can be performed efficiently while preventing unnecessary crushing.

[0015]

As is apparent from the above description, the tapping bit for repairing a tapping gutter according to the present invention has cutting edges on the outer peripheral portion and the front portion, and can efficiently crush degraded refractories and the like. It is possible, and since multiple bases and blades are detachable, when any one is damaged, it is possible to replace only that part and use it, which is economically superior .

[Brief description of the drawings]

FIG. 1 is a partial virtual sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of the adapter.

FIG. 3 is a front view showing a part thereof in cross section.

FIG. 4 is a plan view of a first base metal.

FIG. 5 is a front view showing a part thereof in cross section.

FIG. 6 is a plan view of a second base.

FIG. 7 is a front view showing a part thereof in cross section.

FIG. 8 is a plan view of the bit in an assembled state.

FIG. 9 is a front view of a third base.

FIG. 10 is a sectional view of a main part thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tapping bit repair bit 2 Adapter 3 Fitting hole 6 Fitting part 10 First base metal 11 Second base metal 12 Third base metal 35 First blade body 40 Second blade body 45 Third Blade 50 of the 4th blade

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C21B 7/14 304 B25D 17/02 F27D 1/16 E21B 1/00

Claims (1)

(57) [Claims] 1. An adapter having a fitting hole at a rear end portion into which a rod transmitting torque and thrust is fitted, and a tubular fitting portion provided at a front portion, and a fitting portion of the adapter. A tapping gutter repair bit, comprising: a plurality of detachable plate-shaped bases fitted to the base plate; and a blade body having a sharp cutting edge detachably attached to an outer peripheral portion of the base.