JP2006307258A - Tapping hole opening bite - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To open a filling matte 1' of a tapping hole at once by a hollow rotating rod 3 provided detachably on the center line c and a hollow opening bite 4 provided at its top part in a drifter 2 slidably supported along the center line c of the tapping hole 1 by being guided with a leader 9 arranged in the direction of the tapping hole 1 of a blast furnace. <P>SOLUTION: The tapping hole opening bite is the hollow bit 4 for boring, arranged in the hollow rod 3 in the drifter 2 slidably supported as the parallel with the center line c of the tapping hole 1 and comprises a boring powder and grain exhausting grooves 5 at the symmetrical positions on the side surface and arranges a plurality of tips 7 on the ttop end surface 6, and then, a sharp conical long tip 8 at the center line c together with the hollow bite 4, is projected at the top end surface 6 and the top end part of the sharp conical-shaped long tip 8 is formed as a spherical surface 8'. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an opening bit that drills a mat filled in a slag opening of a blast furnace with a rock drill and discharges pig iron.

  It is dangerous to open the tap filling mat and elute pig iron.

  At this time, in the conventionally used hole bit, the hole position is not determined (it becomes remarkable as the hole bit diameter increases), and it takes time to open the mat. Also, since the hole position is not determined, the opening bit swings on the mat surface, so that the rod breaks or the output mat surface is damaged. was there.

  In other words, a predetermined length of pre-drilling (pre-drilling) is made with the tip cone of the rod mounted on the tap hole drilling machine (rock drill), and then the rod is pulled out and a drill bit is installed to open the filling mat A two-stage system with holes was performed.

  Because it is a two-stage system, it requires dangerous work time, poor working environment improvement, requires materials, and it is difficult to improve productivity.

  Therefore, in order to enable one-step opening that is a one-stage system, there is a method in which high pressure water is passed through the rod and the opening bit to cool it, and water is ejected from the tip of the bit to remove cutting waste. Invented (for example, Patent Document 1).

  In this method, the rod, the opening bit and the filling mat are cooled in a single state, so that it is difficult to prevent vibration due to rotational vibration around the center line of the bit. It was difficult to smoothly and reliably perform one-shot opening along the line.

  When it was not possible to penetrate, oxygen opening was performed and the opening cost was high.

JP-A-9-13113

  The present invention is provided on the centerline so as to be detachable from a rock drill (drifter) guided by a leader installed in the direction of the blast furnace outlet and supported so as to be slidable along the centerline of the outlet. An object of the present invention is to pierce a tap mat with a hollow rotating rod and a hollow opening bit provided at the tip thereof.

In order to achieve the above-mentioned object, the present invention is a hollow bit for drilling provided in a hollow rod of a rock drilling machine supported slidably in parallel with the center line of a spear opening, and drilled in a side-symmetric position. A sharp cone-shaped long tip having a powder discharge groove, provided with a plurality of tips on the tip surface, and sharing the center line with the hollow bit is projected on the tip surface, and the tip of the sharp cone-shaped tip is A spout opening bit formed on a spherical surface,
Second, the hollow bit for drilling has a short cylindrical shape, the drilled particle discharge groove is an arc-shaped groove, and the fluid outlet is opened in the eccentric position of the tip surface and in the arc-shaped groove. The tap hole opening bit according to the invention,
Thirdly, the tip end surface between the arc-shaped grooves is an inclined surface facing the outer surface, and the tap hole opening bit according to the first or second invention, wherein a chip is implanted in each of the inclined surfaces.
Fourth, the side of the sharp cone-shaped long tip is supported by the closing mat of the spout opening, and the hollow bit for drilling is rotated around the long tip as a central axis. Higuchi opening bit,
Consists of.

  Therefore, by rotating and propelling the hollow rod and drilling hollow bit supported by the rock drill toward the pit of the blast furnace along the center line, the repeated impact force from the rock drill is applied to the base end of the rod. Is propelled along the center line from the spherical surface at the tip of the sharp cone-shaped tip into the filling mat at the outlet.

  The sharp conical long tip that has entered the filling mat has a spherical surface at the tip within the center line and the conical side surface presses the mat, and the long tip does not deviate from the center line by the impact force and rotational force. Promote in the direction of

  At the same time as the propulsion, the tip surface of the hollow bit and the inclined carbide tip impact and rotate to cut the outer peripheral surface of the long tip, and the cutting dust (perforated powder particles) is air that is ejected from the fluid jet outlet at high pressure Or it is discharged | emitted from the said inclined surface and perforation | powder-particle discharge | emission groove | channel with water by the water, and this is continued, and a spear opening is opened by one shot in the direction of a center line.

Since the present invention is configured as described above, the base on the center line of the detachable rod of the drifter supported slidably in parallel with the center line by the reader and the sharp conical long tip of the opening bit at the tip are on the center line. Since the opening bit is impact-rotated around the long tip as a center axis, there is no risk of the opening bit swinging, and the filling mat is pushed almost linearly along the center line to open the filling mat in one shot. Can be perforated.
That is

  Improve the success rate of single hole opening (opening through one bit).

  Reduce material costs.

  Maintain a good working environment.

  Greatly improve productivity.

  A reader 9 parallel to the center line c of the blast furnace outlet 1 is installed outside the outlet 1.

  The rocker 2 (drifter) sharing the center line c can be slid to the leader 9 so as to be close to and away from the taphole 1.

  The base end portion of the hollow rod 3 sharing the center line c is detachably fitted to the tip end portion of the rock drill 2, the base end portion is struck and impacted by a reciprocating hammer in the drifter 2, and the base The end can be intermittently rotated around the center line c by the intermittent rotation device in the drifter 2.

  A hollow leg 4 ′ of a hollow bit 4 for drilling a short cylinder is fitted and welded to the rod 3 at the tip of the hollow rod 3.

  On the side surface of the hollow bit 4 for drilling, four drilling powder (cutting waste) discharge grooves 5, 5, 5, and 5 are recessed at symmetrical positions parallel to the center line c. Reference numerals 5 and 5 denote arc-shaped grooves.

  The tip surface 6 between the discharge grooves 5 and 5 is inclined toward the main body side of the bit 4, and cemented carbide chips 7, 7, 7, and 7 are respectively implanted on the four inclined surfaces 6 'and brazed with silver. Then, two cemented carbide chips 7 ′ and 7 ′ are implanted on the tip surface 6 as shown in FIG.

  Further, a sharp conical long tip 8 having an opening angle α of about 15 degrees made of a cemented carbide sharing the center line c with the hollow bit 4 is projected at the center of the tip face 6 and fixed to one body with a silver solder. .

  The length of the conical long tip 8 is 25 mm, the base end diameter is 10 mm, the diameter of the hollow bit 4 is 66.5 mm, and the height of the bit 4 in the direction of the center line c is preferably 35 mm. It is not limited to dimensions.

  Further, the tip surface of the sharp cone-shaped long tip 8 can be a spherical surface 8 ', and the spherical surface 8' can be propelled toward the center line c to cope with eccentric propulsion.

An opening 9, 9 ′ (fluid outlet) of pressurized air or pressurized water is opened in the eccentric position and the groove 5 in the tip surface 6 of the hollow bit 4,
Cutting chips from the long chip 8, cemented carbide chip 7, etc. are discharged from the inclined surface 6 ′ through the discharge grooves 5, 5 through the cutting hole of the filling mat 1 ′ to the outside of the tap hole 1. The filling mat 1 'can be opened and discharged.

  When opening the filling mat 1 ′ of the tap opening 1, the opening bit is pressed against the filling mat 1 ′ by the above-described punching machine of the tap opening 1 to give impact and rotation so that the mat 1 ′ is opened. Crush and peel and drill. The mat 1 ′ is crushed and peeled off by a hard alloy body installed with the tip edge protruding from the opening bit 4, and the tip 7 receives a reaction force from the mat during drilling and is shaken by rotation. A protrusion is required to prevent it from moving. By attaching the sharp cone-shaped long tip 8 to the center portion of the perforated bit 4, the above-described peristaltic movement could be improved. This can greatly contribute to the improvement of on-site workability. Improvement items were able to achieve shortening of the opening time (about 50%), reduction of post-work on the surface of the mating mat (30%), and reduction of risk risk (50%) for workers in front of the furnace.

  The optimal length of the protrusion is 20 to 25 mm with respect to the diameter of the aperture bit of 66.5 mm. If it is short, the opening position cannot be fixed, and if it is long, it breaks.

It is a front view which shows the tap hole opening bit of this invention. It is a top view of FIG. It is a longitudinal cross-sectional view by FIG. 2A-A line. It is a spout opening state top view. This is a conventional tap opening bit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Unloading port 1 'Filling mat c Centerline 2 Rock drill 3 Hollow rod 4 Drilling hollow bit 5 Drilling powder discharge groove 6 Tip surface 7 Carbide tip 8 Sharp conical long tip 8' Spherical surface

Claims (4)

A hollow bit for drilling provided in a hollow rod of a rock drill supported slidably in parallel with the center line of the taphole,
It has a perforated powder discharge groove at the side symmetrical position,
Provide multiple tips on the tip surface,
And a sharp conical long tip sharing the center line with the hollow bit is provided on the tip surface,
A spout opening hole bit formed by forming the tip of the sharp conical long tip into a spherical surface. The drilling hollow bit has a short cylindrical shape,
The perforated powder particle discharge groove is an arc-shaped groove,
2. The tap hole opening bit according to claim 1, wherein a fluid jet port is opened in an eccentric position of the tip surface and in the arc-shaped groove.   The tap hole opening bit according to claim 1 or 2, wherein a tip surface between the arc-shaped grooves is an inclined surface facing an outer surface, and chips are respectively implanted on the inclined surfaces.   4. A spout opening bit according to any one of claims 1 to 3, wherein the side of the sharp conical long tip is supported by a closing mat of the spout opening and the perforating hollow bit is rotated about the long tip as a central axis. .

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