JP2600743B2 - Sub-lance for metal refining - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sublance for metal refining.

[Conventional technology] In a metal smelting furnace such as a converter, a control system based on dynamic control has been developed to reduce labor for blowing operation.
Automation is being planned, and sampling and temperature measurement operations using a sublance are essential conditions for labor saving and automation of the blowing operation. As shown in FIG. 5, the sub lance 3 is a main lance 2 for blowing oxygen into the converter 1.
Inserted with. The atmosphere in the converter is severe and bends in one direction as shown by a dotted line due to heat from a fire point 6 which is a reaction point between oxygen 4 and molten steel 5 and thermal effects such as adhesion of metal and slag by scattering. For this reason, it hinders the attachment / detachment of the probe 7 attached to the distal end of the sublance, thereby hindering sampling and the like. As a technique for solving these problems, a sublance device as disclosed in Japanese Patent Publication No. 55-38591 has been developed. In the publication, as shown in FIG. 6, the sub-lance device includes a water supply outer cylinder 8, a water discharge outer cylinder 9, a water supply main pipe 10, a drain main pipe 11, and an air main pipe supported by a lance lift truck (not shown). A water-cooled sub-lance main body 13 having a triple pipe structure comprising a water-cooled sub-lance main body 13 and a cyclone reduction gear 14 as a drive device for rotating the water-cooled sub-lance main body attached to the drainage outer cylinder (or water supply outer cylinder). ing.
According to this device, the sub-lance main body can be rotated with respect to the lance lifting carriage, and as a result, the sub-lance main body is rotated in the direction opposite to the bending due to the heat effect, thereby allowing the sampling main body having a problem in sampling, side temperature, etc. Bending can be eliminated and the sublance body can be used continuously for a long period of time.

[Problems to be Solved by the Invention] However, the rotating sub-lance device described above has a great effect in preventing the bending of the sub-lance. However, there is still a problem that the function of the sublance cannot be sufficiently exhibited. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a sublance which can sufficiently exhibit the function of the sublance.

[Means for Solving the Problems] A sub-lance for metal refining according to the present invention includes an outer pipe, a partition pipe, and an inner pipe which are concentrically arranged, and the outer pipe and the inner pipe are connected to each other at a distal end portion at a lower end. In a sublance which is integrally fixed and has a partition pipe shorter than the outer pipe and the inner pipe, and has a cooling water channel between the outer pipe and the partition pipe and between the partition pipe and the inner pipe, Between the inner pipe and the inner pipe, the outer surface slides with the partition pipe, and a short pipe having a length that does not deviate from the lower end position of the partition pipe is installed concentrically with the inner pipe and fixed to the inner pipe. A cooling water return channel is formed between a lower end portion and the front end portion, and spiral fins are provided on the inner and outer surfaces of the partition tube.

In the present invention, between the inner pipe and the partition pipe, a short pipe whose outer surface slides with the partition pipe is installed concentrically with the inner pipe and fixed to the inner pipe. It is necessary to form a return channel for the cooling water with the tip. This is because the inventors of the present invention have studied the above problems prior to the invention and have found that the cause is as follows. While the outer tube is extended by radiant heat or the like, the inner tube is less affected. Therefore, the wrinkles due to the heat of the outer tube affect the tip of the lower end of the lance. Although its tip is generally made of copper, it bends by absorbing heat elongation.
Further, since the inner pipe also expands following the expansion of the outer pipe, the width of the return water channel of the cooling water at the tip of the sub-lance is increased, thereby causing a stagnation of the flow. Then, adhesion of the metal occurs.
Therefore, the short pipe is fixed to the inner pipe and slides with the partition pipe.The inner pipe extends following the expansion of the outer pipe. The width of the channel at the tip is not changed.

In the present invention, it is necessary to make the length of the short pipe such that it does not deviate from the lower end position of the partition pipe. Thus, when the outer tube is to be bent, the partition tube is used as a support for preventing the outer tube from being bent through the short tube.

[Operation] In the sublance of the present invention, the short pipe fixed to the inner pipe slides the partition pipe when the inner pipe extends following the expansion of the outer pipe due to heat or the like. Therefore, the width of the water channel at the tip of the sub-lance does not change. And since the short pipe has a length that does not exceed the lower end position of the partition pipe, even if the outer pipe tries to bend due to the difference in elongation with the inner pipe, the partition pipe will not bend through the short pipe. Be supportive. Furthermore,
Since spiral fins are provided on the inner and outer surfaces of the partition tube,
The circumferential deviation of the cooling water is suppressed, and the temperature in the circumferential direction of the outer tube and the inner tube becomes uniform, the elongation of the outer tube and the inner tube can be made uniform. Reinforces pipe bending prevention.

[Example] The present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, a sub-lance 21 used for metal refining such as steel making includes an outer pipe 22 and a partition pipe arranged concentrically.
23 and the inner pipe 24, between the outer pipe 22 and the partition pipe 23, between the partition pipe 23 and the inner pipe 24 as a cooling water channel,
The outer tube 22 and the inner tube 24 are integrally fixed at a sub-lance tip 25 at the lower end. The sub-lance tip portion 25 is made of copper. Then, the partition pipe 23 is made shorter than the outer pipe 22 and the inner pipe 24, and a short pipe 26 whose outer surface slides with the partition pipe 23 is concentrically supported with the inner pipe 24 between the partition pipe 23 and the inner pipe 24. The short pipe 26 is fixedly attached to the inner pipe 24 via a member 27, and a return channel for cooling water is formed between the lower end of the short pipe 26 and the sublance tip 25. The short tube 26 has a length that does not deviate from the lower end position of the partition tube 23. Even if the inner tube 24 extends following the thermal expansion of the outer tube 22, the short tube 26 contacts the partition tube 23. As it slides, the cooling water flowing through the water channel between the partition pipe 23 and the inner pipe 24 passes through the short pipe 26, via the folded water path between the short pipe 26 and the sub-lance tip 25, Outer tube
The water is discharged from the sbrance 21 through the water channel between the pipe 22 and the partition pipe 23. As shown in FIGS. 3 and 4, spiral fins 28 and 29 are provided on the inner and outer surfaces of the partition tube 23.

As a result, when the sub-lance is inserted into the metal refining furnace, even if the outer tube expands due to radiant heat, etc. The waterway width at the tip of the sublance does not fluctuate because of the sliding movement. Even if the outer tube is bent, the bending can be prevented because the inner tube is supported by the partition tube via the short tube. By attaching the fins, the flow of the cooling water can be made smooth, pressure loss can be prevented, and the cooling effect can be improved. In addition, reinforcement for preventing bending of the inner pipe and the outer pipe can be simultaneously performed.

[Effects of the Invention] According to the present invention, spiral fins are provided on the inner and outer surfaces of the partition pipe, and a short pipe that forms a return path for cooling water between the inner pipe of the sub lance and the tip of the sub lance is fixed. However, the bending of the sub-lance can be completely prevented by a simple structure having a mechanism for sliding the partition into the partition tube, and as a result, the function of the sub-lance can be sufficiently exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a sublance according to the present invention;
FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a partially cutaway perspective view showing an example of a sub-lance provided with a spiral fin of the present invention, and FIG. 4 is a line BB of FIG. FIG. 5 is an explanatory view showing a mounting position of a sub-lance of a conventional converter, and FIG. 6 is a partially cutaway front view of a conventional rotary lance. 21 ... Sublance, 22 ... Outer tube, 23 ... Partition tube, 24 ...
… Inner tube, 25… sub-lance tip, 26… short tube, 27…
Support material, 28, 29 ... Fins.

Claims (1)

(57) [Claims] An outer tube, a partition tube, and an inner tube are provided concentrically, and the outer tube and the inner tube are integrally fixed at a lower end portion, and the partition tube is connected to the outer tube and the inner tube. In a sublance that is shorter than the pipe and has a cooling water channel between the outer pipe and the partition pipe and between the partition pipe and the inner pipe, the outer surface slides between the partition pipe and the inner pipe. A short pipe having a length that does not deviate from the lower end of the partition pipe is installed concentrically with the inner pipe and fixed to the inner pipe, and the cooling water is turned back between the lower end of the short pipe and the tip end. A sub-lance for metal refining, wherein a water channel is formed and spiral fins are provided on the inner and outer surfaces of the partition tube.