JPH03257112A - Device for maintaining perpendicular accuracy of converter - Google Patents

Abstract

PURPOSE:To fix trunnion shafts of a converter and to make improvement in the perpendicular accuracy of the converter by crimping the projecting part on the lower side of a ring fitted and fixed into the extension shaft of the trunnion of the converter by means of piston rods of hydraulic cylinders disposed on the right and left thereof. CONSTITUTION:The trunnion shafts 2 of the converter 1 are freely rotatably supported by bearings 3. The one trunnion shaft 2 is further extended to form the extension shaft 2'. The ring 11 provided with the projecting part 10 is fitted and fixed onto this extension shaft 2'. Further, the hydraulic cylinders 12, 12' are disposed symmetrically on both right and left sides around this projecting part 10. After the converter 1 is erected after tilting, the trunnion shafts 2 are freely rotated and the converter 1 is stopped in the nearly perpendicular state by its own weight. The respective hydraulic cylinders 12, 12' mentioned above are then operated and the strokes thereof are fixed constant to press the front ends of the piston rods 13, 13' to the above-mentioned projecting part from the right and left. The perpendicularity of the converter 1 is finely adjusted in this way and the trunnion shafts 2 are fixed to enhance the perpendicular accuracy of the converter 1.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an apparatus for maintaining upright precision of a converter.

[Conventional technology]

As shown in FIG. 3, the converter 1 is rotatably supported on a bearing 3 via a trunnion shaft 2 provided on the outer circumferential surface of the converter 1, and is tilted during receiving and tapping. I was forced to stand up straight.

The converter 1 is tilted by rotating one trunnion shaft 2 by driving a motor (not shown). The converter 1 is held upright by setting the angle scale 6 attached to the gear cover 5 on the operating floor 4 to zero degrees, and the scale indicating arrow 8 attached to the pull gear 7 on the trunnion shaft 2 to keep the converter 1 upright. This is done by detecting both of these conditions and stopping the motor drive.

[Problem to be solved by the invention]

By the way, in the method of holding the converter 1 upright as described above, since the width of the scale line of the angle scale 6 attached to the gear cover 5 is one country, the scale indicating arrow 8 is set within the range of one country width. This error occurs because the height from the center of the trunnion shaft 2 to the furnace mouth 1a is 2 to 4 m, so even a small error causes the converter 1 to tilt significantly, resulting in poor upright accuracy of the converter 1. It was difficult to level the furnace mouth 1a.

If the furnace mouth 1a cannot be leveled, the seal with the skirt of the converter exhaust gas treatment device will be incomplete. That is, even if the annular seal ring at the lower end of the skirt comes into contact with the tilted furnace mouthpiece, the entire circumference does not come into close contact, and a gap is created, causing problems such as leakage of exhaust gas and inflow of air. This is an important technical problem that must be avoided in closed operation or pressurized operation of the converter 1. Furthermore, the sealing performance of the skirt is strictly required in order to improve the recovery rate of exhaust gas.

On the other hand, when viewed from the skirt seal device side, the hollow annular metal fittings of the skirt seal device are fixed to the furnace mouth metal fittings in order to prevent the annular seal ring from lifting up due to the furnace pressure during closed operation or pressurized operation. Although it has been considered to use a clutch door, the clutch door has a small allowable width for engagement, and if the converter 1 is not accurately erected, the clutch door cannot engage. Therefore, the converter 1 is required to have high upright accuracy.

Therefore, the present invention aims to provide an upright precision maintaining device that can improve the upright precision of a converter.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the converter upright precision maintaining device of the present invention rotatably supports the converter trunnion shaft in a bearing, and extends one end of the converter trunnion shaft. A ring with a vertical convex portion on the lower side is fitted and fixed on the top, and hydraulic cylinders are provided symmetrically on both left and right sides around the convex portion of the ring, and the stroke of each hydraulic cylinder is kept constant during operation. The trunnion shaft is fixed by bringing the tip of the piston rod into contact with the convex portion of the ring.

[For production]

The upright precision maintaining device of the present invention configured as described above operates the hydraulic cylinders on both the left and right sides in reverse when the converter is tilted, moves the piston rod backward, releases the convex part of the ring, and then moves the trunnion axis. is rotated by a motor to tilt the converter. When raising the converter, the trunnion shaft is reversely rotated by the motor to raise the converter, then the motor is stopped and the trunnion shaft is allowed to rotate freely. As a result, the converter swings due to its own weight and stops in a substantially vertical state. Then, by operating the hydraulic cylinders on both the left and right sides, when the tip of the piston rod with the same stroke is brought into contact with the convex part of the ring and clamped, the trunnion shaft, which is integrated with the ring, rotates forward or backward at will through the convex part. As a result, the uprightness of the converter is finely adjusted and corrected, and the uprightness of the converter is improved.

〔Example〕

One embodiment of the apparatus for maintaining upright accuracy of a converter according to the present invention will be described with reference to the drawings. As shown in FIG. As shown in FIG. 2, a ring 11 having a vertical convex portion lO on the lower side is fitted and fixed onto the extension shaft 2' by spline fitting. Hydraulic cylinders 1 are arranged symmetrically on both left and right sides around the convex portion 10 of ring II.
2.12' is installed on the bed 9 on the operating floor 4, and the stroke of each hydraulic cylinder 12, 12' is kept constant, and the tip of the piston rod 13.13' is brought into contact with the convex part 10 of the ring 11 during operation. The upright accuracy maintaining device for the converter of this embodiment, which fixes the trunnion shaft 2, has hydraulic cylinders 12 on both the left and right sides when the converter 1 is tilted.
．． 12' in reverse and piston rod 13.13'
is moved backward to release the convex portion 10 of the ring 11. Then, the trunnion shaft 2 is rotated by the motor drive, and the converter 1 is
Tilt. When raising the converter 1, the trunnion shaft 2 is reversely rotated by a motor to raise the converter 1, and then the motor is stopped and the trunnion shaft 2 is allowed to rotate freely. As a result, the converter 1 swings due to its own weight and stops in a substantially vertical state. Thereafter, the left and right hydraulic cylinders 12.12' are operated, and when the tip of the piston rod 13.13' with the same stroke is brought into contact with the convex part 10 of the ring 11 and clamped, the ring 1
The trunnion shaft 2 integrated with 1 rotates slightly forward or reverse,
The uprightness of the converter 1 is finely adjusted and corrected, and the upright accuracy of the converter 1 is improved.

〔Effect of the invention〕

As can be seen from the above explanation, the converter upright accuracy maintaining device of the present invention allows the converter to rotate freely when it is erected and swings due to its own weight, and after stopping in a nearly vertical state, Activate the other hydraulic cylinder, hold the tip of the piston rod with the same stroke in contact with the convex part of the ring fitted and fixed on the extended shaft of the trunnion shaft, rotate the trunnion shaft slightly forward or reverse, By finely adjusting and correcting the uprightness of the converter, it is possible to improve the uprightness of the converter. Therefore, the furnace opening can be leveled, and the annular seal ring at the bottom of the skirt can be brought into close contact with the furnace opening surface all around, preventing leakage of exhaust gas and air inflow, and sealing the converter. When a clutch door is used to fix the hollow annular metal fittings of the skirt seal device to the furnace mouth metal fittings in order to prevent the annular seal ring from lifting up due to the pressure inside the furnace during operation or pressurized operation, Because of the high accuracy of the upright position, the clutch door is able to engage and prevent the annular seal ring from lifting up. Therefore, in closed operation or pressurized operation of the converter, the furnace opening can be completely sealed and stable operation can be achieved.

[Brief explanation of drawings]

Fig. 1 is a front view showing the device for maintaining upright accuracy of a converter according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a view showing a conventional upright holding device for a converter, and Fig. 4 is Fig. 3. FIG. 1... Converter 2... Trunnion shaft 2
'...Extension shaft 1o...Convex part 11...
・Ring 12, 12'...Hydraulic cylinder

Claims (1)

[Claims] 1) The trunnion shaft of the converter is rotatably supported on a bearing, one of the trunnion shafts is extended, and a ring with a vertical convex portion on the lower side is fitted and fixed on the extended shaft, and the ring is Hydraulic cylinders are provided symmetrically on both left and right sides with the convex portion as the center, and the stroke of each hydraulic cylinder is made constant, and during operation, the tip of the piston rod comes into contact with the convex portion of the ring, thereby fixing the trunnion shaft. Upright precision maintenance device for converter, featuring: