JPH0222411A - Method for receiving rotating reaction of tilting device in converter - Google Patents

Abstract

PURPOSE:To prevent occurrence of accident, such as breakage of tilting device, flow-out of molten metal, by arranging buffering mechanism to the tilting device in a converter and restricting the buffering mechanism with clamping device during blowing. CONSTITUTION:The bottom part of the tilting device 1 in the converter is pin-connected with a crank arm 3 through a clevis 6. The crank arm 3 is made to integrated construction with a torsion bar 2 as the buffering mechanism and both ends of the torsion bar 2 are supported with bearings 7 as turnable. Boss 5 having tapered hole 11 is fixed to the crank arm 3 and the clamping device 12 is set at near the boss 5. The clamping device 12 is composed of a tapered rod 4, which is freely advanced/retreated to the tapered hole 11 in the boss 5, and driving device thereof. By this cramping device 12 during blowing, the torsion dar 2 is locked and facility of the buffering mechanism is restricted to avoid resonance. At the time of starting and stopping, which receive large shocking force, the restriction is released to work the buffering facility in itself.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a rotational reaction force receiver for a converter tilting device.

[Prior Art] A rotary drive reaction force receiving device for a converter tilting device equipped with a conventional buffer mechanism is a converter tilting device 1 as shown in FIG. By installing a torsion bar 2 below, fixing the lower part of the tilting device casing to the crank arm with a clevis 6, and fixing both ends of the torsion bar to the ground with a spherical support 7, when no torque is applied to the furnace body, No load is applied to the torsion bar, and when the furnace body is tilted, the reaction force of the tilting torque is applied to the tilting device casing to rotate the casing and twist the torsion bar via the crank arm. The torsional rigidity of this torsion bar acted as a cushion, softening the impact torque acting on the converter tilting device.

[Problem to be solved by the invention] The above-mentioned conventional technology has the following problems.

The regular repetitive forces caused by the shaking of the molten metal during blowing are transmitted to the shock absorber through the tilting device. With the amount of bottom blowing gas used in conventional molten steel refining, the molten metal did not shake so much and the regular repetitive force was small. However, recently, scrap melting,
Large amounts of gas and powder may be injected during melt reduction, etc.
At this time, the molten metal shakes significantly, and the regular repetitive force transmitted to the tilting device is also large.

In particular, a converter tilting device equipped with a buffer mechanism strongly resonates with the repetitive force caused by the rocking of the molten metal, so that abnormal torque may act on the tilting device, potentially destroying the tilting device.

For example, 3QQ with a tilting device with a tilting capacity of 500''
In the TON converter, the natural frequency of the tilting device is 1.0
It's Ilz. On the other hand, since the molten metal rocking also has a vibration component of 1.0 Hz, resonance occurs. Since the vibration torque in the case of resonance is 1750'', the tilting device having a tilting capacity of 500T'' may be destroyed, and a major accident such as molten metal flowing out due to an inverted converter may occur.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for an effective rotary reaction force receiver for a converter tilting device, which can prevent accidents such as destruction of the converter tilting device and spillage of molten metal. purpose.

[Means for Solving the Problems] In order to solve the problems, the present invention provides a converter tilting device with a buffer mechanism for alleviating impact force during operation and a clamp device for restraining the buffer mechanism. , the restraint of the clamp device is released during charging, slag, tapping, etc. other than during converter blowing, and the buffer mechanism is restrained by the clamp device during converter blowing. The rotating reaction force receiver of the converter tilting device is a method.

[Effect] During converter blowing, the buffer mechanism is restrained by the clamp device, so the specific number of motions of the converter tilting device including the buffer mechanism changes significantly, and the regular repetition that occurs during converter blowing changes significantly. It is possible to avoid resonance with force. For example, in a 300 TON converter, the specific number of motions of the converter tilting device including the buffer mechanism is 1. Leaf 2
is changed to 0.4Hz by constraining the buffer mechanism. Furthermore, when the converter is tilted, the restraint is released, so the original buffering function is restored.

[Example] Hereinafter, a first example of the present invention will be described based on FIGS. 1 to 3. The bottom of the converter tilting device 1 is pin-connected to the crank arm 3 through a clevis 6. The crank arm 3 is integrally constructed with a torsion bar 2 serving as a buffer mechanism, and both ends of the torsion bar 2 are rotatably supported on bearings 7.

A boss 5 having a tapered hole 11 is fixed to the crank arm 3, and a clamp device 12 is disposed near the boss 5. This clamping device 12 is composed of a tapered rod 4 that can be moved in and out of the tapered hole 11 of the boss 5 and a driving device thereof.
During blowing, the torsion bar 2 is locked and the function of the buffer mechanism is restrained to avoid resonance, and at the time of starting or stopping when a large impact force is applied, the restraint is released and the original buffer function is activated.

Note that FIG. 4 shows a second embodiment of the present invention, in which the tilting device 1
By installing the tapered spacer 8 in the gap between the stopper 9 and the stopper 9, the clamping device 12'
The clamping device 12' locks the rotation of the converter tilting device 1 during blowing, restrains the buffering function of the torsion bar 2 to avoid resonance, and restrains the converter during startup and shutdown, which are subject to large impact gamma forces. is released and the original buffer function is activated.

[Effects of the Invention] The present invention can restrain the buffer mechanism of the converter tilting device during blowing to avoid resonance with regular repetitive forces generated in the buffer mechanism during blowing. Therefore, the occurrence of major accidents such as destruction of the converter tilting device due to resonance and molten metal flowing out due to the converter being inverted can be prevented. In addition, by releasing the restraint and activating the buffer function during charging or tapping which is subject to a large impact, the impact force applied to the tilting device can be alleviated and the life of the tilting device can be extended.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention; FIG. 1 is an overall view of a converter tilting device having a buffer mechanism and a clamp device;
The figure is an elevational view of a tapered rod insertion type clamp device, and is a detailed view of part a in Figure 1, Figure 3 is a view taken along arrow A-A in Figure 1, and Figure 4 is a second embodiment of the present invention. As an example, FIG. 5 is an elevational view of a clamping device having a tapered spacer, and FIG. 5 is an elevational view of a converter tilting device having a conventional torsion bar. 1... Converter tilting device, 2... 1--John bar, 3
...Crank arm, 4...Tapered rod, 5
... Hoss, 6... Clevis, 7... Bearing, 8...
・Tapered spacer, 9...stopper, lO・
...Torsion bar shaft center, 11...Tapered hole, 1
2.12'...clamp device.

Claims (1)

[Claims] 1. The converter tilting device is equipped with a buffer mechanism to reduce the impact force during operation and a clamp device to restrain the buffer mechanism, so that it can be used during charging, slag, tapping, etc. other than during converter blowing. A method for receiving rotational reaction force of a converter tilting device, characterized in that the restraint of the clamp device is released, and during converter blowing, a buffer mechanism is restrained by the clamp device.