JPS6229467Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an immersion lance, and relates to the provision of an immersion lance that is intended to facilitate the removal of used lance bricks and the installation of new lance bricks.

This is a smelting method in which gas or powder is injected into molten steel or hot metal, which is frequently carried out at present, but the life of the lance brick is short and the lance brick must be replaced frequently. The used lance is reused by crushing and removing the old lance bricks and loading new lance bricks, but in this case,
In conventional lances, after a new lance brick is loaded onto the core metal, a brick holder is welded to the core metal to prevent it from falling off.

However, in the above conventional configuration, when the used lance bricks are crushed and removed and new bricks are loaded,
There was a problem in that it was necessary to remove the brick support from the core metal each time, and this work required a lot of labor and time.

The present invention was devised in view of such conventional problems, and its feature is that a plurality of cylindrical lance bricks are attached to the immersion side of one end of the core metal on the side that is immersed in the molten metal. A locking groove is provided around the immersion side end of the concentric metal, and a retaining member for preventing the lance brick from falling off from the same side end is removably fitted into the locking groove. and a tip lance brick covering the retaining member is screwed to the same end,
On the other hand, a pressing nut is screwed to the other end of the core metal on the held side so that it can move back and forth in the axial direction, and is fitted onto the core metal between the lance brick and the pressing nut so that it can freely slide in the axial direction. The lance brick is provided with a pressing body that presses and fixes each of the lance bricks to the retaining member and allows the lance bricks to be released.

Hereinafter, embodiments of the present invention will be explained according to the drawings.
In FIGS. 1 to 4, the immersion lance 1 has a core metal 4 consisting of a double pipe of an inner tube 2 and an outer tube 3, and one end of the core metal 4 is immersed in molten steel or hot metal. The side 5 is formed to loosely fit a plurality of lance bricks 6 in an axially removable manner, and a locking groove 7 is formed at the immersion side end of the outer tube 3. A male thread 8 is formed at the third end, and both the immersion side ends of the inner and outer tubes 2 and 3 are welded to each other.

The lance bricks 6 are each of the same shape and size and are cylindrical as a whole, and a truncated conical hole 9 is formed at one end in the axial direction so as to widen the axial end, and at the other end, the diameter becomes smaller in the axial end direction. A truncated conical protrusion 10 is formed, a cylindrical hole 11 having a larger diameter than the inner hole of the lance brick 6 is formed in the small diameter part of the truncated conical hole 9, and a cylindrical body 12 is protruded from the small diameter part of the truncated conical protrusion 10. ing. Then, the truncated conical hole 9 and the truncated conical projection 1 of the lance brick 6 adjacent to each other in the axial direction
0, the cylindrical hole 11 and the cylindrical body 12 fit into each other, and the lance bricks 6 are held on the same axis.

Two split annular locking tools 13 are removably fitted into the locking grooves 7 from the radial direction.
The outer circumferential surface of No. 3 is formed into a truncated conical shape, and the immersion side end thereof is the large diameter portion. An annular stopper 14 having a truncated conical inner circumferential surface that makes surface contact with the outer circumferential surface of the annular stopper 13 is provided, and the engagement of the stopper 14 with the stopper 13 and the outer periphery of the stopper 14 are prevented. By fitting the lance brick 6 into the cylindrical hole 11, the lance brick 6 is prevented from falling off from the immersion side end of the core metal 4, and the locking tool 13 and the removal stopper 14 are inserted into the lance brick 6. The lance brick 6 constitutes a retaining member and is held on the axis of the core metal 4.

A tip lance brick 6a is screwed onto the male screw 8, and covers the immersion side end of the core bar 4 together with the retaining members 13 and 14.

The held side 1 is opposite to the immersed side 5 of the lance 1.
5, a thick-walled cylindrical holding tube 16 is fitted and fixed to the outer tube 3 at the end thereof, and a first flange 17 is fixed to the held end of the holding tube 16. An inner tube 2 is fixedly fitted into the inner hole. or,
A pressing nut 18 is screwed onto the other end of the holding tube 16 so as to be able to move back and forth in the axial direction, and an annular engaging body 20 having a circumferential engaging groove 19 is protruded from the immersed side surface of the pressing nut 18. A second flange 21 is externally fitted and fixed to the middle part of the pipe 16 in the axial direction, and the second flange 21
A pair of hooks 22, 22 are constructed at symmetrical positions in the radial direction between the outer circumferential surface of the holding tube 16 and the holding tube 16. The first flange 17 is for connecting to a supply source of gas or powder to be blown into the molten metal, and the second flange 21 is for holding the lance 1 on a conveying device (not shown) or the like.

The cylindrical pressing body 23 is loosely fitted to the core metal 4, one end of which is slidably fitted onto the engaging body 20, and is slidably abutted against the side surface of the pressing nut 18, and the other end is provided with: An annular pressing plate 24 is fixed to the outer tube 3 so as to be slidable in the axial direction, and an engaging bolt 26 screwed into a nut 25 fixed to the pressing body 23 is slidably inserted into the engaging circumferential groove 19 in the circumferential direction. The lance bricks 6 are movably engaged, and by twisting the pressing nut 18, the pressing plate 24 presses and fixes each lance brick 6 to the retaining members 13 and 14, and can be released.
In addition, a plurality of sand supply holes 27 are provided through the pressing body 23 in the circumferential direction, and a notched groove 28 is formed on the inner circumferential surface of the pressing plate 24. The sand-filled gap 30 between the outer tube 3 and the inner hole of the lance brick 6 is communicated with each other via the notch groove 28.

Next, based on the configuration of the above embodiment, the lance brick 6
An example of the installation and disassembly work procedure is shown below.

The lance bricks 6 are sequentially fitted from the immersion side end of the core metal 4, and these lance bricks 6 are connected to the pressing body 23 and the locking groove 7.
and are fitted together and filled. Next, after externally fitting the stopper 14 onto the core bar 4, the stopper 13 is fitted into the locking groove 7, and the stopper 14 is moved toward the immersed side end so that the tapered outer periphery of the stopper 13 is Removal stopper 1 on the surface
The tapered inner peripheral surfaces of No. 4 are abutted and engaged. Then, by twisting the pressing nut 18, the lance brick 6 is
is tightened and fixed between the pressing plate 24 and the retainer 14. In this case, the pressing nut 18 is twisted by locking a special tool into the locking hole 18a formed on the outer periphery of the pressing nut 18, but the pressing body 23 and the pressing nut 18 are slid relative to each other. The lance brick 6 and the pressing plate 24 are configured not to slide relative to each other.

Then, by hanging the immersion side 5 so that the lance 1 is axially oriented and supplying insulating sand from the supply hole 27, the insulating sand passes through the cutout groove 28 and fills the sand filling gap 30.

Before or after the time when the lance brick 6 is tightened and fixed between the pressing plate 24 and the stopper 14, the tip lance brick 6a is screwed onto the male screw 8 as appropriate,
The installation work of the lance brick 6 is completed.

On the other hand, in disassembling the used lance brick 6, first, at least the tip lance brick 6a is crushed and removed;
When the retaining members 13 and 14 are removed from the locking groove 7 and the immersed side 5 is allowed to hang down, the lance brick 6 will fall off from the core bar 4 and the disassembly work will be completed.

Although the above is based on the illustrated example, the core metal 4 does not need to be a double tube as in the illustrated example, and may be a single tube with the inner and outer tubes 2 and 3 integrated.

According to the present invention, the retaining members 13 and 1 are provided in the retaining groove 7.
4 is removably fitted and prevents the lance brick 6 fitted onto the core bar 4 from falling off, making it easy to assemble the lance brick 6, and also simplify its disassembly, making work easier. Extremely useful.

Moreover, since each of the above-mentioned operations is simplified, it is beneficial in terms of work safety, and it is also easier to mechanize these operations, which can bring about many useful effects.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is an overall vertical sectional view, Fig. 2 is a partially enlarged view of Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4. is an enlarged view of the immersion side end of the lance in FIG. 1; 1... Lance, 4... Core bar, 5... Immersion side, 6
...Lance brick, 6a...Tip lance brick, 7...
...Latching groove, 13...Latching tool, 14... Removal stopper, 1
5...Holded side, 18...Press nut, 23...
Pressing body.

Claims (1)

[Scope of utility model registration request] A plurality of cylindrical lance bricks are fitted onto the immersion side of one end of the core metal on the side to be immersed in the molten metal so as to be freely inserted and removed in the axial direction, and a locking groove is provided around the immersion side end of the core metal, and the locking groove is provided around the immersion side end of the core metal. A retaining member that prevents the lance brick from falling off from the same end is removably fitted in the stop groove, and a tip lance brick that covers the retaining member is screwed to the same end. A pressing nut is screwed onto the other end of the held side so that it can move back and forth in the axial direction, and is fitted onto the core metal between the lance brick and the pressing nut so that it can slide in the axial direction, and by twisting the pressing nut, each of the lance bricks A structure of an immersion lance characterized by being provided with a pressing body that can be pressed and fixed to a retaining member and can be released freely.