KR100987342B1 - Apparatus for interceping slag flowing into the raddle - Google Patents

Abstract

The present invention relates to a slag inflow blocking device for preventing the inflow of slag that is mixed with the molten steel into the molten steel ladle when the molten steel is pulled out from the electric furnace.

To this end, the present invention wraps the outside of the outlet of the electric furnace and the slag detection unit 100 is provided with a primary coil 110 for generating an induced electromotive force and a secondary coil 120 for detecting a change in the voltage generated by the induced electromotive force. ), A control unit 200 receiving the detection signal from the slag detection unit 100 and outputting a slag inflow signal and a blocking unit installed at one side of the electric furnace and receiving a blocking signal from the control unit 200 to close the tap hole ( 300 is included, the blocking unit 300 is a bracket 301 is installed on the stationary motor 310 on one side, the power transmission gear 350 is installed in order to mesh with the rotation shaft of the stationary motor 310 in sequence. The tension gear 340, the pinion gear 360 and the rack gear 330, the rack gear 330 is fixed to the guide bar 320 and the guide bar 320 is fixed in the longitudinal direction on the front and the rear Descending with guide bar 320 It provides chadanbong 370 flows the slag block being provided with a device for opening and closing the sphere.

Electric furnace, molten steel ladle, slag, inflow blocking

Description

Apparatus for interceping slag flowing into the raddle}             

1 is a block diagram of a slag inlet blocking device according to the present invention.

Figure 2 is a view showing a slag detection unit of the slag inflow blocking device according to the present invention.

Figure 3 is a view showing a blocking device of the slag inlet blocking device according to the present invention.

Figure 4 is a view showing the configuration of the tension gear constituting the blocking device of the present invention.

5 is a view showing a locking pin constituting the tension gear of FIG.

6A and 6B are views illustrating an operation process of blocking the entrance of the entrance of the electric furnace by the blocking device of FIG. 3, respectively.

<Explanation of symbols for the main parts of the drawings>

100 ... slag detection unit 110 ... primary coil 120 ... secondary coil

200 ... control part 300 ... cutoff part 301 ... bracket

302 ... Guide roll 310 ... Reverse motor 320 ... Guide bar

321 ... Guide rail 330 ... Rack gear 340 ... Tension gear

341 ... gear body 342 ... fixing plate 343 ... locking pin                 

350 Power transmission gear 360 Pinion gear 370

390 position sensor

The present invention relates to a slag inflow blocking device for preventing the inflow of slag that is mixed with the molten steel into the molten steel ladle when the molten steel is pulled out from the electric furnace.

In general, in order to manufacture high quality molten steel, after charging scrap metal and molten iron, a predetermined subsidiary material is added and electric power, oxygen, and other coal ash are added. The slag generated in this process forms the upper layer of the electric furnace, and the molten steel forms the lower layer of the electric furnace.

Therefore, the molten steel is pulled into the ladle through the outlet of the lower part of the electric furnace, and when the lower part of the lower part has a high proportion, the vortex is generated at the end of the tapping. The problem of incorporation into the ladle together arises.

However, in the related art, since the manager sensed that the slag is mixed into the molten steel through the color change of the molten steel that is visually exposed to the naked eye, it is difficult to determine the exact inflow timing of the slag flowing into the ladle. Therefore, even if the manager detects the color change of the molten steel being taken and immediately takes the steps to prevent the slag from flowing into the ladle, the slag is already introduced into the ladle.

When the slag flows into the molten steel, the quality of the molten steel is lowered, and the secondary raw material and ferroalloy inputs are increased during the second refining, thereby increasing the manufacturing cost and reducing the productivity since it takes a lot of refining time.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a slag inflow blocking device in which slag in an electric furnace is prevented from flowing into a ladle together with molten steel at the end of tapping.

In order to achieve the above object, the present invention is provided with a secondary coil 120 for wrapping the outside of the exit of the electric furnace to generate an induced electromotive force and a change in the voltage generated by the induced electromotive force. The slag detection unit 100, the control unit 200 receiving the detection signal from the slag detection unit 100 and outputting the slag inflow signal and an electric furnace installed on one side and receiving the blocking signal from the control unit 200. It is made to include a blocking unit 300 for closing, the blocking unit 300 is a bracket 301 is installed on one side of the stationary motor 310, the power is installed in order to be engaged in the rotation axis of the stationary motor 310 sequentially Transmission gear 350, tension gear 340, pinion gear 360 and rack gear 330, the guide bar 320 and the guide bar 320 is fixed in the longitudinal direction to the front rack gear 330 It is fixed to the back and the guide bar 320 Lowered to provide chadanbong 370 flows the slag block being provided with a device for opening and closing the tapping sphere.

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In order to facilitate the vertical raising and lowering of the guide bar, a guide roll is installed on one side of the bracket, and a vertical guide rail fitted to the guide roll is formed on the side of the guide bar.

In addition, the tension gear may include a gear body having both an outer tooth and an inner tooth formed at the same time, a locking pin engaged with the inner tooth to prevent slippage of the gear body, and a fixing plate rotatably fixed to the bracket and fixed at the front of the bracket. Can be.

In addition, the upper and lower ends of the guide bar is preferably provided with a position sensor for detecting the position of the bracket, respectively.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

As shown in Figure 1, the slag inlet blocking device according to the present invention is installed in the exit of the electric furnace slag detection unit 100 for detecting the slag, and slag inlet signal received from the slag detection unit 100 receives the slag blocking signal It includes a control unit 200 for outputting, and a blocking unit 300 for receiving the slag blocking signal from the control unit 200 to close the tap.

As shown in FIG. 2, the slag detection unit 100 includes a primary coil 110 and a secondary coil 120 surrounding the outside of a tap hole of an electric furnace. When an alternating current is generated in the primary coil 110, induced electromotive force is generated by the flow of molten steel. The voltage generated by the induced electromotive force is sensed by the secondary coil 120. In general, since slag has a lower conductivity than molten steel, the slag detection unit 100 detects a voltage that is changed by mixing slag in molten steel and sends a slag inflow signal to the controller 200. The controller 200 receives the slag inflow signal from the slag detection unit 100 and outputs a slag blocking signal to the blocking unit 300.

As shown in FIG. 3, the blocking unit 300 includes a bracket 301 in which the stationary motor 310 is installed, and a power transmission gear 350 and a tension gear that are sequentially engaged with the rotation shaft of the stationary motor 310. 340 and the pinion gear 360 and the rack gear 330, the rack gear 330 is fixed to the front and guide bar 320, which is raised and lowered vertically along the rack gear 330, guide bar 320 It is fixed to the rear is composed of a blocking rod 370 to open and close the tap while lifting vertically with the guide bar 320.

The bracket 301 is fixed to the vertical position of the upper portion of the outlet to the outside of the electric furnace, the stationary motor 310 is installed on one side of the bracket 301. The power transmission gear 350 is connected to the rotation shaft of the stationary motor 310, and the tension gear 340, the pinion gear 360, and the rack gear 330 are sequentially connected to the power transmission gear 350.

The tension gear 340 has a gear body 341 formed at the same time as the outer tooth and the inner tooth, a locking pin 343 engaged with the inner tooth to prevent slippage of the gear body 341, and fixed to the bracket 301. It has a fixing plate 342 to which the locking pin 343 is fixed. The fixing plate 342 is fixed to the bracket 301.

The rack gear 330 is vertically fixed to the front of the guide bar 320 and is engaged with the pinion gear 360 to move up and down with the guide bar 320.

The rack gear 330 is vertically fixed to the front of the guide bar 320 and the blocking rod 370 is vertically fixed to the rear. The blocking rod 370 is inserted into the cylinder 380 fixed to the rear of the guide bar 320, and fixed in the cylinder 380 by a tightening screw 381 installed in the cylinder 380. On the other hand, the cylinder 380 may further include a clamp 382 for pressing the blocking rod 370 by the tightening screw 381. In this case, the initial fixing of the blocking rod 370 with respect to the guide bar 320. You can adjust the position. Here, the initial fixing position of the blocking rod 370 refers to the fixing position of the guide bar 320 to close the exit port by lowering the blocking rod 370 into the electric furnace.

On the other hand, the guide bar 320 is supported by a guide roll 302 formed on one side of the bracket 301. To this end, the guide rails 321 on which the guide rolls 302 are seated are formed vertically on both sides of the guide bar 320.

In addition, both ends of the guide bar 320 is preferably provided with a position sensor 390 for detecting the position of the bracket 301, respectively. The position sensor 390 moves up and down with the guide bar 320 while detecting the bracket 301 and stopping the operation of the stationary motor 310 by moving up and down with the guide bar 320.

It describes the operation of the slag inlet blocking device according to the present invention made of such a configuration.

 When slag is mixed in the molten steel flowing into the ladle at the end of the tapping of the electric furnace, the voltage changed by the primary coil 110 and the secondary coil 120 of the slag detector 100 is detected, and the slag detector which detects the change in the front ( 100 outputs the slag inflow signal to the controller 200.

When the slag inflow signal is transmitted to the control unit 200, the control unit 200 outputs a slag blocking signal to the blocking unit 300.

When the blocking signal is transmitted to the blocking unit 300, the normal and reverse motor 310 of the blocking unit 300 is operated. When the rotating shaft of the stationary motor 310 rotates, the rotational force of the rotating shaft is transmitted to the guide bar 320 by the gears connected to the rotating shaft. In particular, the rack gear 330 vertically installed on the guide bar 320 moves the guide bar 320 downward by the rotation of the pinion gear 360. At this time, the guide roll 302 installed in the bracket is seated on the guide rail 321 of the guide bar 320 to support the guide bar 320 to move up and down, and at the same time to move up and down the guide bar 320 Help.

When the guide bar 320 descends, the blocking rod 370 fixed to the rear of the guide bar 320 descends into the electric furnace and closes the tap hole. This prevents slag in the furnace from entering the ladle through the exit. As the blocking rod 370 closes the exit, the bracket 301 is detected by the position sensor 390 installed at the bottom of the guide bar 320, and the position sensor 390 immediately starts the operation of the stationary motor 310. By stopping, the blocking rod 370 is no longer lowered into the exit.

On the other hand, the tension gear 340 connected to the rotation axis of the stationary motor 310 is operated so that the blocking rod 370 no longer descends into the tap hole by the weight of the guide bar 320 even after the stationary motor 310 stops. . That is, the locking pins 343 engaged with the inner teeth of the tension gear 340 are continuously rotated in the forward direction when the guide bar 320 descends, and the spring 344 installed on the locking pins 343 is fixed to the inner teeth with a constant force. As it pushes out, the tension gear 340 may immediately stop the rotation without slippage occurring. Then, when the guide bar 320 is raised, the locking pin 343 is not rotated in the reverse direction by the fixing plate 342, so that the fixing plate 342 and the locking pin 343 are in tension with the internal gears of the tension gear 340. Rotate with gear 340.

Thereafter, after the slag is no longer introduced into the ladle by the manager, when the preparation for the tapping operation is completed, the control unit 200 operates the rotating shaft of the stationary motor 310 to rotate in the reverse direction, thereby lowering the blocking rod 370 into the electric furnace. Open the exit by raising it from the exit. When the tap is open, molten steel with slag removed is introduced into the ladle through the tap.

In addition, the blocking rod 370 rising together with the guide bar 320 is stopped by the bracket is detected by the position sensor 390 installed on the top of the guide bar 320. Therefore, the blocking rod 370 may be moved up and down within a certain range by the operation of the position sensors 390, and the blocking rod 370 is excessively lowered to break the exit or excessively raised to guide bar 320 ), The guide roll 302 is not separated from the guide rail 321.

According to the slag inflow blocking device of the present invention as described above, the inflow of slag passing through the tapping path of the electric furnace is quickly and accurately detected by the slag detection unit for detecting the voltage change of the tapping path of the electric furnace, the blocking rod of the blocking part The closing of slag into the ladle completely blocks the quality of the molten steel produced, and prevents overuse of secondary raw materials and ferroalloys administered during subsequent secondary refining. Productivity is improved by reducing the refining time.

While the invention has been shown and described with respect to specific embodiments thereof, it will be understood that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It should be included in the scope of the invention.

Claims (5)

A slag detector (100) provided with a primary coil (110) surrounding the exit of the electric furnace and generating an induced electromotive force, and a secondary coil (120) for detecting a change in voltage generated by the induced electromotive force; A control unit 200 receiving a detection signal from the slag detection unit 100 and outputting a slag inflow signal; And It is installed on one side of the electric furnace and receives a blocking signal from the control unit 200 is made to include a blocking unit 300 for closing the exit, and the blocking unit 300 is a bracket that is installed on the one side of the normal and reverse motor 310 301; A power transmission gear 350, a tension gear 340, a pinion gear 360, and a rack gear 330 which are sequentially engaged with the rotation shaft of the stationary motor 310; The rack gear 330 is a guide bar 320 fixed in the longitudinal direction on the front and The slag inlet blocking device is fixed to the back of the guide bar 320 and provided with a blocking bar (370) for opening and closing the exit by descending with the guide bar (320). delete The method of claim 1, A guide roll 302 is installed at one side of the bracket 301, and a vertical guide rail 321 supported by the guide roll 302 is formed at a side of the guide bar 320. Inflow blocker. The method of claim 1, wherein the tension gear 340 is An outer tooth and an inner tooth formed at the same time; A locking pin 343 engaged with the inner tooth to prevent slippage of the gear body 341; And Slag inlet blocking device characterized in that it is rotatably fixed to the bracket 301 and the fixing plate 342 is fixed to the locking pin (343) on the front. The method of claim 1, Slag inlet blocking device is provided on the upper and lower ends of the guide bar 320 is provided with a position sensor 390 for detecting the bracket (301).

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