JPS5925941B2 - Sublance device - Google Patents

Description

[Detailed Description of the Invention] In metal refining furnaces such as converters, an F5L leg system using dynamic control has been developed to save labor and automate blowing work. This is an indispensable condition for labor saving and automation of blowing work.

Generally, the sublance body is fixed to a sublance lifting cart and is moved up and down along the guide of the revolving frame to carry out the sampling and temperature measurement operations. Figure 1 shows how the sublance is used in a converter. As shown in the schematic cross-sectional view, the sub-lance 3 inserted into the converter 1 together with the main lance 2 absorbs heat from the flash point 6, which is the reaction point between the oxygen 4 of the main lance 2 and the molten steel 5, and the base metal. Due to thermal effects such as adhesion due to scattering of slag, it bends in one direction (toward the main lance), and as a result, the probe 1 for sampling and temperature measurement at the tip of the sub-lance 3 is perpendicular to the molten steel. 2 Supplement 3 and probe □ are blocked by oxygen 4 jet and flash point 6, which causes problems with sampling, etc.
3. The automatic attachment/detachment device (not shown) of the probe 7 cannot be used. 4. The supplement 3 does not enter the passage hole in the hood (not shown) and becomes unusable.
5 Sublance 3 may rise when ascending, but after being left unattended, it may bend and become unable to descend, causing problems. Therefore, in the past, attempts have been made to prevent the sublance from bending by strengthening the water cooling of the lance, preventing metal adhesion to the sublance, etc.; Since the sub-lance is placed in an atmosphere where it is affected by heat from the fire point, it is not possible to completely avoid the heat effect, and the preventive means cannot reliably prevent the sub-lance from bending. Therefore, in order to prevent the bending of the sub-lance, the inventors conducted various experiments on the relationship between the number of sampling charges by the sub-lance during blowing and the bending in the direction of the main lance. As shown in the graph showing the relationship between bending and bending toward the main lance, the sub-lance bends toward the main lance in approximately proportion to the number of sampling times due to the thermal influence from the fire point due to the oxygen dinit of the main lance. Focusing on this recognition, and furthermore, since conventionally the sub-lance body was fixed to the sub-lance lifting cart and no consideration was given to rotating the sub-lance itself, the sub-lance was not bent due to the thermal influence. Based on the knowledge that if the sub-lance is rotated in the opposite direction, the almost regular bending of the sub-lance due to the thermal effect can be actively utilized, and therefore the resulting bending of the sub-lance can be eliminated, a patent application was filed earlier. Showa 51-10
No. 6248 is a water-cooled sublance main body with a triple pipe structure consisting of a water supply outer cylinder and a drainage outer cylinder supported on a sublance lifting truck, a water supply main, a drainage main, and an air main, and the water supply outer cylinder. or a drive device for rotating the sub-lance main body attached to the drainage outer cylinder, the water supply main being rotatably fitted to the water supply outer cylinder via a seal mechanism, and the drainage main The pipe is rotatably fitted into the drainage outer cylinder via a sealing mechanism, and the water supply main pipe and drainage main pipe have a water supply hole and a drainage hole that communicate with the water supply outer cylinder and the drainage outer cylinder, respectively. A sublance device provided with holes was filed.

Hereinafter, this will be referred to as the prior invention. Hereinafter, the above-mentioned prior invention will be explained with reference to the drawings.

FIG. 3 is a partially cutaway side view of the sublance device according to the prior invention, and FIG. 4 is a partially cutaway front view of the sublance device according to the prior invention. As shown in the figure, 8 is a rotating frame, 9 is a sub-lance lifting truck, and 10 is a water-cooled sub-lance body supported by the sub-lance lifting truck 9 by an outer cylinder, which will be described later. Although not shown, a probe is provided.

The sublance lifting cart 9 is suspended by a wire 11, and is raised and lowered by winding and unwinding the wire 11 by a winch (not shown). As shown in FIG. 4, the sublance device of this prior invention includes a water supply outer cylinder 12, a drainage outer cylinder 13, a water supply main pipe 14, a drainage main pipe 15, and an air main, which are supported by a sublance lifting cart 9. A water-cooled sub-lance main body 10 with a triple-pipe structure consisting of a pipe 16, and a cyclo reducer as a drive device for rotating the water-cooled sub-lance main body 10, which is attached to the drainage outer cylinder 13 (or water supply outer cylinder 12). Machine 1
7, the water supply main pipe 14 is rotatably fitted to the water supply outer cylinder 12 via an oil seal 18 as a seal mechanism, and the drain main pipe 15 is fitted with an oil seal 18 as a seal mechanism. The water supply outer cylinder 12 and the drainage outer cylinder 13 are rotatably fitted to the drainage outer cylinder 13 via a seal 19, and the water supply outer cylinder 12 and the drainage outer cylinder are installed at several places around the water supply main pipe 14 and the drainage main pipe 15, respectively. A water supply hole 20 and a drainage hole 21 communicating with 13 are provided.

As shown in FIG. 4, bearings 22 and 23 are provided between the water supply main pipe 14 and the water supply outer cylinder 12, and are disposed at both ends in the vertical direction.
is rotatable with respect to the water supply outer cylinder 12, and the bearings 22, 23 are tightened and fixed by a tightening nut 24, thereby connecting the water supply outer cylinder 12 and the water supply main pipe 14. However, they are assembled in such a way that they do not come apart.

Moreover, 25 is a flange joint for connecting an external water supply pipe (not shown) attached to the water supply outer cylinder 12;
is an annular groove provided in an annular shape between the inner part of the water supply outer cylinder 12 and the outer part of the water supply main pipe 14, and the water supply hole 20 communicates with the annular groove 26 to prevent water from entering from the outside. Water supply (cooling water) is sent into the main water supply pipe 14 via the flange joint 25, the annular groove 26, and the water supply hole 20. The drainage main pipe 15 is also constructed in the same manner as the water supply main pipe 14, and is rotatable with respect to the drainage outer cylinder 13 by means of bearings 27 and 28, and furthermore, by a tightening nut 29, the drainage The main pipe 15 and the drainage outer cylinder 13 can be assembled.

Further, 30 is a flange joint for connecting an external drain pipe (not shown), and 31 is an annular groove. sampling,
A rotary joint 32 to which an external air branch pipe (not shown) is attached is attached to the upper end of the air main pipe 16 and the lice connected to the probe for temperature measurement, and is fixed to the drain main pipe 15. Further, the drain main pipe 15 is fixed to the water supply main pipe 14 with bolts 33. A small sprocket 3 is attached to the rotating shaft of the cyclo reducer 17 attached to the drainage outer cylinder 13.
4 is installed, and this small sprocket 34 and the large sprocket 35 installed at the upper end of the drain main pipe 15.
A chain 36 is routed between the sublance main body 10 and the sublance main body 10 rotates with respect to the drainage outer cylinder 13, the water supply outer cylinder 12, etc. by the rotation of the cyclo reducer 17. There is.

Note that 37 is a hanging tool attached to the drainage outer cylinder 13, and by hanging this hanging tool 37 with a crane or the like (not shown), the sub-lance main body 10 can be moved to the sub-lance lifting cart 9.
The sublance main body 10 is attached to and removed from the sublance lifting cart 9 by simply attaching the sublance main body 10 to the sublance lifting cart 9.
This is done by inserting the sub-lance main body 10 from above into a hole provided in the pedestal 9a at the upper end and into an Asiast device 38, which will be described later. Further, as shown in FIG. 3, an Asiast device 38 for centering and fixing the sub-lance (with a turning roller) is provided at the lower end of the lance lifting cart 9, making it easy to center the sub-lance body 10. I'm starting to be able to do it. With such a configuration, by rotating the cyclo reducer 17,
The sublance main body 10 itself rotates with respect to the drainage outer cylinder 13 and the water supply outer cylinder 12. However, in the sublance device of the prior invention, the water supply main pipe and the water supply outer cylinder, and the drainage main pipe and the drainage outer cylinder are not necessarily synchronized, which may cause a failure in the sealing mechanism, etc., resulting in water leakage. There was a risk that this would occur.

Furthermore, as converters and the like become larger, the length of sub-lance devices also increases, and some lance devices exceed 20 m. The sub-lance device used in the converter is inserted into the converter through the hood provided in the converter, but the length of the sub-lance as described above is not suitable for the converter equipment and operating conditions. It is very difficult to check its verticality. Therefore, in the past, if the sub-lance was bent as described above and it became difficult to insert or pull it out of the passage hole provided in the hood, the lance was cut off and a different lance was used. However, the sub-lance device of the prior invention has a very large effect because it can be used after correcting the bending of the lance. However, it is not necessarily suitable for making a judgment to correct the bending. That is, when the sub-lance body is rotated by the drive device, it is difficult to grasp the rotation angle of the lance body, and the angle at which the sub-lance body rotates is often inaccurate, resulting in the problem that the features of the above-mentioned prior invention cannot be fully utilized. Therefore, the present inventors conducted various studies in order to improve the sublance device of the prior invention, and as a result, in the sublance device of the prior invention, a sublance rotation angle detector was provided in the drive device, and the water supply outer cylinder and The inventors have found that it is sufficient to provide a flange joint on each outer cylinder for drainage, and to connect the flange joints with a connecting plate.

This invention has been made based on the above findings, and will be explained below with reference to Examples.

FIG. 5 is a partially cutaway side view of a sublance device according to an embodiment of the present invention, and FIG. 6 is a partially cutaway front view of the same. In the drawings, the same numerals as in FIGS. 3 and 4 indicate the same parts, so the explanation will be omitted. And said both flange joints 25,
30 are mutually connected by a ζ connection plate 41. As a result, rotational deviation between the rotary joints of the water supply section and the drainage section can be prevented, and smooth rotation of the sub-lance can be achieved. Further, a sublance rotation angle detector 43 is attached to the drive device 17 via a mounting frame 44.

As the sublance rotation angle detector 43, a Selsin rotation meter is used. Said sublance rotation angle detector 43
By detecting the angle of the sub-lance body before rotation at the time the sub-lance body is installed, it is easy to understand in which direction the position of the sub-lance body when rotated is relative to the position before rotation. can do. This may be done, for example, by using a pointer on a disc with a 360-piece scale, or by using a scale on a chart paper. Note that the detector 43 has a structure that allows control of drive rotation. In this embodiment, a pin 42 is welded to the lower surface of the water supply outer cylinder 12, and the pin 42 is inserted into a hole (not shown) formed on the truck.
By inserting this, the water supply outer cylinder 12 is prevented from rotating together with the water supply main pipe 14 when the sublance rotates.

Furthermore, the rotary joint 32 of the air main pipe is provided with a screw hole 45 at the top so that a lead wire for a probe for temperature measurement and component measurement can be inserted, and it can be closed with a cap when not in use. It's summery. As explained above, according to the present invention, it is possible to easily and accurately grasp the rotation angle of the sub-lance body, so it is possible to rotate the lance body that is bent beyond the allowable range to an appropriate position, and to connect Since the plates can synchronize the rotational and sliding movements of the water supply main pipe and the water supply outer cylinder, as well as the drainage main pipe and the drainage outer cylinder, failures in the sealing mechanism etc. can be prevented and there is no risk of water leakage, etc. Industrially extremely useful effects are brought about.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view showing how the sublance is used in a converter, Fig. 2 is a graph showing the relationship between the number of sampling times and the bending of the main lance, and Fig. 3 is a partially cutaway side view of the sublance device of the prior invention. 4 is a partially cutaway front view of the sublance device of the prior invention, FIG. 5 is a partially cutaway side view of the sublance device of the present invention, and FIG. 6 is a partially cutaway front view of the sublance device of the present invention. It is a diagram.

Claims (1)

[Claims] 1. A water-cooled sub-lance main body with a triple pipe structure consisting of a water supply outer cylinder and a drainage outer cylinder supported by a lance lifting truck, a water supply main, a drainage main, and an air main, and the water supply outer cylinder or drainage a driving device for rotating the sub-lance body attached to the water supply outer cylinder, the water supply main pipe is rotatably fitted to the water supply outer cylinder via a seal mechanism, and the drainage main pipe is rotatably fitted to the water supply outer cylinder via a seal mechanism. The water supply main pipe and the drainage main pipe have a water supply hole and a drainage hole, which are rotatably fitted to the drainage outer cylinder via a sealing mechanism, and which communicate with the water supply outer cylinder and the drainage outer cylinder, respectively. In the sub-lance device provided, the drive device is provided with a lance rotation position detector,
A sublance device characterized in that the water supply outer cylinder and the drainage outer cylinder are each provided with a flange joint, and the flange joints are interconnected by a connecting plate.