JPH07126731A - Device for straightening bending of sub-lance - Google Patents

Abstract

PURPOSE:To prevent the lowering of operating ratio of the refining work in a converter by straightening the bending of a sub-lance for converter at the on-line waiting position within short time. CONSTITUTION:The sub-lance 14 is positioned at the on-line waiting position, and a sub-lance straightening machine 1 is resin with an elevating mechanism 13 and sub-lance 14 is abutted on fixed rolls 2 so that the bent part comes between the fixed rolls 2. The straightening roll 6 is pushed to the sub-lance 14 by working a straightening hydraulic cylinder 5 in this condition to straighten the bending of the sub-lance 14 by developing the bending moment between the straightening roll and the fixed rolls 2. By this method, the sub-lance can be straightened within a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting the bending of the tip of a sublance of a converter at an online standby position in a short time.

[0002]

2. Description of the Related Art A sublance of a converter is a device for measuring the temperature of molten steel and collecting samples for chemical analysis during refining of the converter. When the sublance is used, the tip portion will bend over time. If the sublance is curved, it becomes impossible to automatically attach and detach the probe, which is an instrument for measuring the temperature of molten steel and collecting a sample for chemical analysis, to the holder on the side of the sublance, so it becomes necessary to replace the sublance.

[0003]

It takes about 2 hours to replace the sublance. During this period, it is not possible to measure the temperature of the molten steel with the sublance and to collect samples for chemical analysis, so it is necessary to carry out operations such as temperature measurement and sample collection by inversion of the converter. That is, during this period, the operation rate of the converter refining work is reduced, the heat radiation loss is increased, and the wear of the furnace wall refractory is increased.

On the other hand, the sublance having a curved tip needs to be straightened to correct the curve. In the conventional method of correcting the curving of the sublance off-line, the sublance is laid horizontally and the curving portion is corrected by using a jack on a gate type jig or a gag type jig. A lot of man-hours are required for these works.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus capable of correcting the curvature of a sublance online in a short time.

[0006]

A device for correcting the bending of a sublance according to the present invention is a device for correcting the bending of a sublance suspended vertically, and includes an elevating mechanism for vertically moving a pedestal and a pedestal. Two fixed concave rolls having the same curvature as that of the sublance, which are fixedly provided on the upper side in the vertical direction, and the two fixed concave rolls are located at substantially vertical center positions and horizontally. The movable fixed roll having a curvature substantially the same as that of the sub lance and movably provided, and the pressing means for pressing the movable concave roll against the two fixed concave rolls are provided. The roll is provided at a position where it comes into contact with the sublance when the sublance is at the online standby position.

[0007]

When the gantry is lifted by the elevating mechanism at the online position of the sub lance, the two fixed concave rolls come into contact with the outer surface of the sub lance. By adjusting the vertical position of the gantry, the two fixed concave rolls are arranged in such a position as to sandwich the curved portion of the sublance. In this state, the pressing means is driven to push the movable concave roll toward the fixed concave roll, so that the movable concave roll presses the sub lance, and a bending moment of the sub lance is given between the movable concave roll and the two fixed concave rolls. This corrects the bending of the sublance.

Since a concave roll is used in the portion which directly contacts the sublance during straightening, even if the gantry is moved up and down, an excessive frictional force with the sublance is not generated and a bending moment is applied to the sublance. Since the gantry can be moved up and down in the closed state, the correction can be effectively performed.

[0009]

An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a vertical side view of a sublance provided with the sublance correction device of the present invention and equipment in the vicinity thereof. FIG. 2 is a vertical side view of the straightening machine 1. FIG. 3 is a plan view of the straightening machine 1. In these drawings, reference numeral 1 is a straightening machine, which is installed on the lance deck 29. The lance deck 29 is installed above the furnace opening of the converter and is provided for maintenance work of the blowing lance and the sublance 14.

Reference numeral 34 is a probe. When measuring the temperature of molten steel or collecting a sample for chemical analysis during refining of the converter, the sublance 14 uses the upper bearing 19 and the lower bearing 2
It swivels around 0 and moves to the furnace opening of the converter, and then it descends into the furnace from the furnace opening of the converter by the sub-lance lifting carriage 21 to sample the temperature of molten steel and collect samples for chemical analysis. And so on.

This turning is performed by the turning boom 16 being driven by the turning cylinder 17 via the turning bracket 18 to turn the turning boom 16. Reference numeral 22 is a rotating device. When correcting the sublance 14 whose tip portion is curved, the swing boom 16 moves the sublance 1
4 is rotated and held so that the sublance 14 is positioned above the through hole 30 of the straightener 1, and then the lifting mechanism 13 raises the sublance straightener 1 to lift the curved tip of the sublance 14. It is inserted and held in the through hole 30 of the straightener 1.

Next, the geared motor 23 rotates and the drive wheel 24 directly connected thereto rotates to rotate the driven wheel 25. The sub lance 14 is suspended by the rotating device 22 and turns together with the driven wheel 25. By rotating the sublance 14 as described above, the bending direction of the tip portion can be aligned with the direction of the straightening hydraulic cylinder 5 of the sublance straightening machine 1. At this time, the water supply pipe 26, the drain pipe 27 and the nitrogen pipe 28 rotate together with the sublance 14.

2 and 3 are a vertical side view and a plan view showing the details of the straightening machine 1, respectively. A take-up unit 10 is installed in a window provided on the take-up slide base 9. The straightening roller (movable roller) 6 is supported by the take-up unit 10 via a bearing. The straightening roller 6 is a straightening hydraulic cylinder 5 and a take-up slide base 9
Move horizontally along the window. Reference numeral 12 is a mount for the straightening hydraulic cylinder 5. At this time, the force of the straightening hydraulic cylinder 5 is transmitted to the roller arm 8 and is transmitted to the straightening roller 6 via the guide roller 7 supported by the roller arm 8. On the other hand, the two fixed rollers 2 are attached to the roller frame 3 via bearings 4.

The straightening machine 1 is installed at a position immediately below the standby position for the sub-lance, and moves up and down by the operation of an elevating cylinder 15 provided in the elevating mechanism 13. In FIG. 1, the elevating mechanism 13 is shown in a lower limit position.
Indicates a rising state. Normally, the sublance 14 in operation is attached / detached the temperature measurement / sampling probe 34 three times for each charge by a probe automatic attachment / detachment device installed separately.

Next, since the sublance 14 is bent at the tip portion thereof as it is used, the core is misaligned and the attachment / detachment of the probe 34 is hindered. In this case, the sublance 14 is stopped above the through hole 30 of the straightening machine 1 at the online sublance standby position. Sublance 14
After the stationary, the lifting mechanism 13 is hydraulically operated to extend the lifting mechanism 13, and the straightener 1 is lifted to a certain position.

The sub-lance 14 is inserted between the fixed roller 2 and the straightening roller 6 and bent by the straightening roller 6 whose axial center is pushed out to the position B by the force of the straightening hydraulic cylinder 5. Is corrected.
When the straightening work is completed, the straightening hydraulic cylinder 5 retracts,
The straightening roller 6 is retracted by the coil spring 11 and is moved to the position shown in FIG.
Return to position A in.

Here, it is also possible to use an electric screw mechanism instead of the hydraulic cylinder. Further, although the straightening roller 6 and the straightening hydraulic cylinder 5 are not fixed to each other in the above-mentioned embodiment, it goes without saying that those in which these are fixed and integrated are also included in the scope of the present invention.

[0018]

According to the present invention, it is possible to correct the curvature online in a short time while the sublance is suspended vertically from the sublance lift truck at the tip of the swing boom. It is possible to prevent a decrease in the operation rate of the converter refining work and to continue the operation of the inclining furnace for a long time.

[Brief description of drawings]

FIG. 1 is a vertical side view of a converter lance deck provided with a sublance straightening machine of the present invention.

FIG. 2 is a vertical side view of the sublance straightening machine of the present invention.

FIG. 3 is a plan view of the sublance straightening machine of the present invention.

[Explanation of symbols]

 1 Straightening machine 2 Fixed roller 3 Roller frame 5 Straightening hydraulic cylinder 6 Straightening roller 12 Cylinder stand 13 Lifting mechanism 14 Sublance 15 Lifting cylinder

Front page continued (72) Inventor Kaname Itakura Maruuchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Kenichi Inoue 1-2-1 Marunouchi, Chiyoda-ku, Tokyo In the company

Claims (1)

[Claims] 1. A device for correcting the bending of a vertically suspended sublance, which comprises an elevating mechanism for vertically moving a gantry and a sublance that is fixedly provided on the gantry at intervals in the vertical direction. Two fixed concave rolls having the same curvature, and two fixed concave rolls, which are provided at substantially vertical center positions of the two fixed concave rolls and are movable in the horizontal direction,
The movable lance roll having substantially the same curvature as the sub lance and the pressing means for pressing the possible concave roll against the two fixed concave rolls are provided, and the two fixed concave rolls have a sub lance online standby. An apparatus for correcting the bending of a sublance, which is provided at a position where it abuts on the sublance when it is in the position.