KR100287129B1 - Safety device of dart input equipment in converter - Google Patents

Abstract

The present invention relates to a dart input device that closes the exit port at the time when the tapping is completed during the converter tapping operation to suppress the outflow of slag, and more specifically, due to the power failure of the main power or the trouble of the driving motor during the tapping operation. The present invention relates to a safety device for protecting the burnout of the equipment from abnormal operation.

The present invention is provided with a winch unit below the base of the variable frame installed on the upper frame, a traction member which extends from the winch unit to be wound or unwound, and is connected to the front of the variable frame. . This prevents burnout of dart input equipment and reduces damage such as interrupting converter operations.

Description

Safety device of dart input equipment in converter

The present invention relates to a dart input device that closes the exit port at the time when the tapping is completed during the converter tapping operation to suppress the outflow of slag, and more specifically, due to the power failure of the main power or the trouble of the driving motor during the tapping operation. The present invention relates to a safety device for protecting the burnout of the equipment from abnormal operation.

Converter process is a method of making steel from pig iron. It is a method of using converter as a steel making furnace. It is divided into acidic converter method and basic converter method and rotates jar-shaped furnace to drain the waste water.

In the converter method, molten pig iron is injected into the converter and blown with high-pressure air to oxidize and remove impurities in the raw material to make steelmaking. When the pig iron is melted in the converter, slags such as solvents, nonmetallic materials, and metal oxides are formed. It is produced in large quantities and floats or remains on waste water.

The molten metal produced in the converter is tapped by opening or tilting the troughs.

When the tapping is almost completed from the converter, the height of the injection ladle and the state of the tapping flow are judged to finish the tapping, and at the same time, the converter is established to prevent further flow of the slag, but when establishing the converter, a large amount of molten steel in the ladle is established. As it is already leaked, this results in poor steelmaking, segregation and lower error rate due to the impurities (P2O5, S) contained in the slag, which usually leaves 20 ~ 30% without leaving all molten metal in the converter. To finish.

This method of rolling down the converter appears as a problem that the slag does not come out of molten metal or the molten metal is not sufficiently pulled out depending on the position of the converter in the tapping stage despite the steelmaking efficiency of the converter method. It is known to put a slag checkball inside.

In this method, a steel sphere with a specific gravity of about 7 is made, and a caster ball, which is a refractory with a specific gravity of about 7, is spherically bonded, and fired. The volume ratio of the steel sphere and the caster ball is about 4: 6. It is a way to block the exit hole by putting it in molten steel.

In other words, if the converter is tilted toward the tap after finishing the blow, the slag with a small specific gravity floats on the upper part of the molten steel and the molten steel with a high specific gravity taps into the ladle through the tap. When the slag check ball is thrown at the center, the slag check ball floats between the upper slag and the lower molten steel layer due to the difference in specific gravity, and the slag check ball blocks the exit at the same time. In this way, instead of tilting the converter directly, the entrance of the converter was blocked along the molten steel, thereby increasing molten steel and reducing slag flow.

The slag check ball is put into the converter using another input device, which has a bogie on the periphery of the converter and a strap attached to it, or a bogie guide rail installed, a caster ball placed on it, and a device that throws into the converter by rolling motion. I use it.

However, because the slag check ball method is to block the exit hole by floating or sinking to the molten metal due to the difference in specific gravity of the check ball is whether the check ball can block the exit hole exactly. In other words, the slag check ball blocks the steel ball according to the specific gravity, so as the molten metal tapping progresses, there is a question of whether the steel ball can be blocked exactly at the predetermined time. There was no.

Another way was to introduce dart into the converter.

The dart consists of a long pin part and a refractory conical ball that allows the ball to go down due to a specific gravity difference while the pin enters the tap hole of the tap. Compared to the obvious performance. The apparatus for introducing the dart into the converter is introduced in US Pat. Nos. 4,553,743 and 4,634,106,4,640,498, respectively.

The main part of the dart feeder includes a cylinder part 6 supported by the fixing frame 3 and its fixing part as shown in FIG. 1, and a variable frame 4 and a carriage for carrying and returning the dart 2 into the converter 1. (5) and the cylinder part 7 which adjusts the angle of the variable frame 4 centering on the cylinder fixing part, and it is classified into the upper support type and the lower support type according to the supporting method of the variable frame 4. .

The upper support method is characterized by hanging the variable frame (4) in the horizontal direction in the vertical axis direction to the fixed frame (3) and has the advantage of not causing obstacles between structures because it is not installed on the ground, the lower support method is a horizontal frame Since the extension frame is mounted on and operated, a bed installed on the ground is necessary and there is a high possibility of causing interference between structures.

Either type or method of operation is to operate the variable frame (4) in the horizontal frame to insert the dart (2) into the converter, so induce a length conversion of the variable frame (4) and adjust the angle again to adjust the dart (2) The cylinders 6 and 7 adjust the conversion and angle of the length of the variable frame 4 directly into the converter.

Another dart input equipment is as shown in Figs. The dart feeding device has a fixed frame 3 at the top, a tilting unit 8 at any position of the fixed frame 3, and a position spaced apart from the tilting unit 8 at an arbitrary distance. Hanger beam (9) is located in, the variable frame (4) and the variable frame supported by the hanger beam (9) and the fixed frame (3) to inject the dart into the converter through the length change and angle adjustment of the lance (10) It consists of a drive unit 11 for moving the lance 10 along (4).

However, in the case of the upper support type, regardless of the driving type, the weight of the variable frame 4 entering the converter 1 has a considerable weight and the downwardly directed movement of the entry shape is inclined downward so that the pressure or power of the cylinder Suddenly lowering or falling causes the variable frame 4 to fall into the converter and stop the steelmaking operation.

When the variable frame 4 is out of the normal track, it is difficult to recover it again, and not only the entire dart input equipment needs to be replaced, but the damage is greater when the dart equipment is connected to the surrounding structure.

This phenomenon occurs especially when the supporting method of the variable frame 4 is the upper supporting method and is equipped with automation equipment. When the power use ratio is large, the damage is more severe when the dart enters the converter in a situation such as a power failure. Similarly, even when using a non-cylinder motor, troubles may occur due to voltage instability, which causes inability to operate the variable frame and stops at the return phase from the converter or early darts into the converter. .

Such a conventional dart input device is a type that prevents the exit port by sending the dart into the converter through the variable frame, so that the variable frame is operated at a predetermined time accurately so that the dart is blocked at the optimum time according to the progress of the dart tap. Although there is a problem to be done, when a power change occurs due to a power failure or pressure change, there is a problem in that the position control of the variable frame is impossible and the converter is burned out or the dart input equipment is burned out.

Therefore, an object of the present invention is to reduce the spreading damage by returning the variable frame to the initial position immediately when the control of the variable frame is impossible due to the power abnormality or other factors of the variable frame that sends the dart directly into the converter in the dart input device.

1 is a schematic diagram of a conventional upper support dart input device

2 is a plan view showing another example of the dart input equipment

3 is a front view of FIG. 2

Figure 4 is a safety device and lance operation of the dart input equipment according to the present invention

* Description of the symbols for the main parts of the drawings *

1: conversion 2: darts

3: fixed frame 4: variable frame

5: carriage 6.7: cylinder

8: tilting unit 9: hanger beam

10: lance 11: driving part

12: winch unit 13: towing member

14: hanger bracket 15: rotating shaft

16 exits

A feature of the present invention for achieving this object is a variable frame having a frame and a lance supported on the frame for injecting darts into the converter, and having a drive unit for moving the mask frame, the angle of the extension frame through the drive unit. In the upper support dart input facility for adjusting the;

The dart input device is provided with a safety device,

The safety device is installed on the bottom of the winch unit on the basis of the end of the variable frame installed on the upper frame,

The winch unit extends from the winding or unwinding made of a member,

The member is connected to the front end of the variable frame.

Optionally, the chain is used as a towing member extending from the winge unit.

Optionally, the wire rope is used as a towing member extending from the winch unit.

If the winch unit is installed at any position around the variable frame that moves the lance and injects the dart into the converter while installing the dart input device as the upper support structure, the variance of the variable frame caused by the instability of the variable frame and continuous This can result in damaging the converter or preventing the burnout of the variable frame, protecting the dart loading equipment as a whole and maintaining the continuity of the converter operation.

An embodiment of the present invention will be described with reference to the drawings.

Figure 4 shows the model of the dart input equipment to which the present invention is applied and the installation example of the safety device.

The dart feeding device has a fixed frame 3 on the upper part, and a tilting unit 8 at any position of the fixed frame 3, and is spaced apart from the tilting unit 8 at an arbitrary distance. Hanger beam (9) is located in, the variable frame (4) for supporting the hanger beam (9) and the fixed frame to inject the dart (2) into the converter (1) through the length change and angle adjustment of the lance (10) And it consists of a drive unit 11 for moving the lance 10 along the variable frame (4).

The present invention adds a safety device to such a dart input device.

The safety device is formed by installing a winch unit 12 below the base of the variable frame 4 installed on the fixed frame 3, and extending from the winch unit 12 to be wound or unwound 13 ) Is made to be connected to the front of the variable frame (4).

On the front of the variable frame 4 is a hanger bracket 14 to which the towing member 13 extending from the winch unit 12 is coupled. In addition, a winch unit 12 may be provided with a safety switch for driving the winch unit 12 or placed in a separate control unit. The power entering the winch unit 12 is separated from the power entering the drive unit or the winch unit. You can also set up a hand-operated instrument.

This makes it possible to recover by the winch unit against departure due to malfunction of the variable frame resulting from power instability and power failure, thereby preventing damage of the variable frame or damage to the converter. A detailed operation will be described below with reference to the drawings.

4 shows the tilting of the variable frame 4 and the operation of the lance 10.

The variable frame 4 is supported on the fixed frame 3 by a chain and hoist that fixes the guide frame to the fixed frame 3 between the front of the guide frame and the fixed frame 3 and simultaneously from the fixed frame 3. It is supported by the fixing frame 3 through the support bracket of the hanger beam 9 which is vertically lowered.

The chain hoist functions as a tilting unit 8 of the variable frame 3 in cooperation with the tilting bracket and the supporting bracket, which are other supports.

The tilting unit 8 is connected to the variable frame 4 and fixed to the fixed frame 3 so that when the chain is wound, the variable frame 4 is rotated about the rotation axis 15 of the tilting bracket as much as the chain winding amount and is overall. Lifting the variable frame (4) up, and rewinding the chain is also lowered down about the axis of rotation (15).

Accordingly, when the mask frame 4 is tilted according to the hoist driving, the angle of the mask frame 4 can be easily adjusted from the tilting unit 8 when aiming or deviating from the exit hole 16 in the converter 1. It is done.

The variable frame 4 is also converted in length. The length change corresponds to adjusting the length of the lance 10, which is obtained by driving the lance 10 along the mask frame 4, and moving the lance 10 by installing a traveling unit at the end of the lance 10. Let's do it. This drive unit is made by combining the motor drive unit 11, the chain and the sprockets installed on both ends of the variable frame 4 in a linkage relationship. When the motor is rotated, the power rotates the chain hanging on the sprocket and travels by the movement force of the chain. The unit produces a change in length of the lance 10 while linearly moving along the variable frame 4.

In order to put the dart 2 into the exit hole 16 of the converter 1, the dart 2 is inserted into the converter 1 through the angle adjustment of the variable frame 4 and the length conversion of the lance 10 as described above. Put it in.

However, when the current flowing into the driving unit is cut off or a trouble driving of the motor occurs, the normal operation of the lance 10 is stopped.

In particular, when such a phenomenon occurs when the lance 10 is introduced into the converter 1, the lance 10 is accelerated and the lance 10, which is raised when the power is lost when it is returned, is gravity-shifted again due to its own weight and slope. 1) An abnormal phenomenon that enters inside appears. This is a phenomenon that deviates from normal driving, so it appears as a serious postpartum leave.

For example, it is a phenomenon in which the lance 10 is burned out or the position control unit of the variable frame provided to the drive system is burned out or the variable frame collides with the converter 1 and is broken.

This phenomenon spreads the damage by moving heavy objects when there is no power such as instability of the drive system and power failure.

The present invention has been provided so that if a phenomenon is found, a brace may heal it. In other words, when the safety switch in the winch unit 12 or the control panel is operated, the winch unit 12 generates power, and the power of the winch unit 12 winds a towing member 13 such as a chain or a wire connected to the variable frame 4 and its traction force. Raise the variable frame to return.

The traction force produced by the winch unit 12 is first transmitted to the lance via the hanger bracket 14 in the lance 10 via the traction member 13 to pull the lance 10 along the variable frame 4. It appears to work.

Under normal operating conditions of the lance 10, the traction force does not work and maintains the traction member 13 in a state in which the lance 10 is released by the amount of release. This state does not pull the lance 10 with traction but functions as a safety device to eliminate any further movement of the lance 10 or departure from its current position.

As described above, the present invention solves the safety problem of the dart input device that puts the dart in the converter for the purpose of blocking the slag outflow from the converter through the winch unit, thereby preventing operation damage or equipment damage by the dart input equipment. It is effective to prevent damage at the converter site by preventing it.

Claims (1)

A frame, a tilting unit hanging at an arbitrary position of the frame, and a variable frame are installed so that one side is fixed to the tilting unit and the other side is rotated, and the variable frame includes a lance moving by a driving unit. In the safety device of the dart input device for inserting the dart into the converter, the safety device is installed on the bottom of the variable frame based on the winch unit, the chain or wire rope extending from the winch unit to be wound or unwound Safety device of the in-dart dart input equipment, characterized in that provided with the same traction member and connected to the hanger bracket of the front of the variable frame.