KR100398407B1 - An automatic control apparatus of hot metal tap hole at mud gun - Google Patents

Abstract

The present invention automatically recognizes and processes each operation information related to the exit closure, so that the entry point of the blast furnace can perform smooth and stable exit closure control by promptly responding to automatic judgment conditions, emergency actions, and problems through program operations and sequences. It relates to a closing control method. Accordingly, the present invention is connected to the hydraulic outlet valve formed on the hydraulic line to supply / block the hydraulic pressure from the hydraulic motor to the forward / backward solenoid valve and the charge forward / reverse solenoid valve, respectively, when the hydraulic motor is connected to the hydraulic tank. Standby hydraulic motor for supplying drive hydraulic pressure to the swing forward / backward and forward / backward solenoid valves, a hydraulic detection sensor for detecting whether a hydraulic abnormality is output from each hydraulic motor, and a detection result operation of the hydraulic detection sensor A switching valve for shutting off the hydraulic line on the side of the hydraulic motor in which an abnormality occurs and switching the hydraulic line to supply the driving hydraulic pressure from the hydraulic motor in normal operation to the corresponding forward / backward solenoid valve, and the detection result of each hydraulic detection sensor Judging the hydraulic motor that has an abnormality by receiving the input, and when the filling is in progress to drive the normal operating hydraulic motor is driven by the filling before / reverse control valve It is provided with a control panel end for controlling the driving of the switching valve and the hydraulic outlet valve so that the hydraulic pressure is supplied.

Description

Exit control device of blast furnace {AN AUTOMATIC CONTROL APPARATUS OF HOT METAL TAP HOLE AT MUD GUN}

The present invention relates to a control method for closing the outlet of a steelworks furnace, and more specifically, to automatically recognize and process each operation information related to the closure of the outlet, so as to quickly cope with an automatic judgment condition, an emergency action, and a problem through a program operation and sequence. The present invention relates to a blast furnace closure control method for smooth and stable outlet closure control.

In general, the blast furnace is a facility for producing pig iron, charges iron ore, coke, limestone, etc. from the top of the blast furnace and blows hot air into the tuyeres at the bottom to burn the coke in the furnace to generate gas.

In this way, molten iron (pig iron) is discharged through the outlet at regular intervals, and the mud-closure device (Clay-gun) is used in the method of closing the outlet when the melt is discharged to the outlet. Filling the device and operating the hydraulic motor (MOTOR) (10,20) to generate the hydraulic pressure by the driver step by step in the field of turning and filling before / reverse operation of the mud-closure device (Clay-gun) device.

Referring to the schematic diagram of the conventional blast furnace factory clay gun hydraulic device and the hydraulic pressure shown in Figure 1, the hydraulic motor 10, 20 is configured for each exit port and in one hydraulic tank (7) Hydraulic oil causing oil is supplied to the two hydraulic motors (10) (20). In order to protect the hydraulic motor, the oil level gauge 6 and an overload switch are configured in the hydraulic tank 7 so as to detect the abnormality of the hydraulic device due to the oil shortage and the poor viscosity.

When the driver judges the completion time of melt discharge through the melt nominal status at the exit port, when the driver confirms that normal hydraulic pressure is generated by operating the corresponding exit hydraulic motor 10, the exit mud closure device is pre-rotated by an operation switch. The pre-rotating solenoid valve 13 is operated so that the outlet closing device moves to the outlet opening where the melt is being discharged from the standby position, and when the arrival outlet is completed, the outlet mud closure is smaller than the melt pressure discharged from the blast furnace. When the pre-rotation pressure is high, when the PERMIT LAMP is turned on by the turning pressure switch, the driver executes the filling of the outlet mud closure, and the mud, which is an irregular refractory, is pushed into the melt discharge hole to block the melt discharge hole. .

After the mud is blocked by the discharge hole, to prevent the mud damage by the melt pressure, after turning the air outlet mud closure device back and forth until the mud is fired, the turning forward / reverse solenoid valve 13 is reversed. Move to the standby position.

In this conventional method, when the driver recognizes the bottom level in the furnace and completes the exit opening command, the exit mud closure device turns forward and operates precisely by the encoder 18 signal. When the forwarding is completed, the turning pressure switch causes the mud, which is an irregular refractory in the outlet melt discharge hole, to be automatically closed in the discharge hole by the PSI programming output signal.

However, when the hydraulic pressure is not generated due to the occurrence of abnormality of the hydraulic motor and the pumps 11 and 21 during the closing of the exit port by the operation of the exit mud closure device, if the rolling occurs due to the blast furnace furnace pressure, the melt flows out. The nozzle and tip of the pioneer mud closure are damaged and the pressure in the furnace has to be reduced to the outlet closure chamber, which leads to an inevitable decrease in production.

However, in the related art, since a separate device for detecting a hydraulic motor and a pump abnormality is not provided, the driver must check with the naked eye. In addition, when it is determined that the leakage of the melt due to the abnormality of the hydraulic line is determined, the driver turns off the driving of the manual valve and the hydraulic motor of the hydraulic line by manual operation to cut off the hydraulic supply to the hydraulic motor and the hydraulic line. Proper rapid control is not possible.

Accordingly, the present invention has been made in order to solve the above-mentioned conventional problems, the object of the present invention is to automatically detect the outflow of the hydraulic line due to abnormal occurrence of the hydraulic motor and the pump during the turning operation of the mud closure device, The automatic switching to the hydraulic line on the pump side is to provide a blast furnace closing control device that can prevent the melt flow and damage to the mud closure device.

1 is a schematic diagram of a conventional blast furnace plant column exit closing device.

Figure 2 is a schematic configuration diagram of the outlet mud closure device of the present invention.

3 is a control system diagram of the outlet mud closure device of the present invention.

* Detailed description of the symbols given in the drawings *

6 level switch

7 Oil Tank

10,20 hydraulic motor

11,21 HYDRAULIC PUMP

12,22 Hydraulic pump outlet valve (VALVE)

13,23 Swivel forward / backward electromagnetic valve

14,24 slewing forward / reverse cylinder

15,25 Filling cylinders

16,26 Electromagnetic valves before and after filling

17,27 Hydraulic pressure sensor

30 Motor Drive Control Unit

40 Hydraulic line automatic switching valve (VALVE)

100 control panel end,

140 Encoder

150 Standby position detection sensor.

In order to achieve the above object, the outlet closing control device of the blast furnace according to the present invention supplies the hydraulic pressure supplied from the hydraulic tank to the turning forward / backward and the filling before / backward solenoid valves through the hydraulic motor to drive the closing control device. In the blast furnace closing control device to control and close each exit of the blast furnace completed the departure,

A hydraulic outlet valve formed on a hydraulic line configured to supply / block hydraulic pressure from the hydraulic motor to the revolving forward / backward solenoid valve and the precharge / reverse solenoid valve respectively;

A standby hydraulic motor connected to the hydraulic tank for supplying driving hydraulic pressure to the turning forward / reverse and filling before / reverse solenoid valves when an abnormality occurs in the hydraulic motor;

A hydraulic pressure detection sensor for detecting whether a hydraulic abnormality is output from each of the hydraulic motors;

A switching valve for shutting off the hydraulic line on the side of the hydraulic motor in which a malfunction occurs as a result of the detection of the hydraulic detection sensor, and switching the hydraulic line to supply driving hydraulic pressure from the hydraulic motor in normal operation to the corresponding forward / backward solenoid valve; ,

Determines the hydraulic motor in which the abnormality is received by receiving the detection result of the oil pressure detection sensor, and when the filling is in progress to drive the normal operating hydraulic motor to supply the hydraulic pressure to the switching before / reverse control valve and the switching valve and the oil And a control panel end for controlling the driving of the extrusion side valve.

Hereinafter will be described in detail with reference to the accompanying drawings the configuration and operation effects of the exit control device of the blast furnace in accordance with a preferred embodiment of the present invention.

Figure 2 is a system diagram showing the configuration of the exit control device of the blast furnace according to the present invention. As shown in FIG. 2, the hydraulic pump operation in the outlet closing control device of the blast furnace according to the present invention is automatically operated when the exit closing command signal is generated to generate hydraulic pressure, and the generated hydraulic pressure operates the outlet mud closing device. Make it possible.

That is, the turning pre / reverse and the filling pre / reverse operation, the outlet mud closure device is moved when the hydraulic solenoid valve 13 (16) is turned on, and after completion of the rotary rotation, press the irregular refractory into each outlet melt discharge hole and press out. The pioneer will be closed.

After the exit mud closure device has been pre-rotated, before the mud, which is an irregular refractory, is pressed down by the hydraulic line leakage, and the failure of the exit mud closure due to the pump overload, the melt is applied to the tip and nozzle of the closure device. In the present invention, the hydraulic pressure detection sensor (17) (27) for detecting the abnormal pressure of the hydraulic line on each outlet port hydraulic pump output line side to the damage to the melt due to the collision to reduce the pressure drop in the hydraulic line flow rate leakage Will be detected.

At this time, the control panel end (not shown) automatically operates the standby hydraulic pump 21 by using the pressure drop detection signal by the hydraulic detection sensors 17 and 27 so that the pump, which is the source of hydraulic pressure, is operated. The pump for the flow leak will automatically stop. The driving of the outlet valve 12 and the switching valve 40 of each corresponding hydraulic pump was controlled to enable control of the closing electromagnetic valve.

On the other hand, in the present invention, in order to confirm the completion of the exit melt discharge hole according to the turnout mud closure device pre-rotation operation according to the exit port closure, the encoder as a position detection sensor is configured on the pivot axis of the exit mud closure device According to the detection value, it is determined whether the mud closure device has completed the advance rotation. Therefore, as in the conventional case, the driver not only determines whether the preliminary rotation has been completed by determining whether the approval lamp is lit, but also enables accurate preliminary rotation completion determination according to the detection result of the encoder. Thus, when the driver confirms that the approval lamp is lit and performs the filling forward operation to close the mud, which is an irregular refractory, in the melt discharge hole, it is possible to prevent leakage and closing failure that will be generated due to the late operation of filling forward.

3 is a control system diagram of the exit closure control device of the blast furnace for implementing the present invention. As shown in Fig. 3, in the outlet closing control apparatus of the blast furnace according to the present invention, after the starting start signal is generated, the exit opening speed and the molten material are generated in order to automatically recognize whether the exit melt is completed. The detection signal by the in-house low-level level detection sensor 160 using the generation amount is recognized so that the melt discharge completion time can be automatically recognized.

On the other hand, when the outlet closing command signal, the control pressure, and the filling amount is set and input in the operation unit 120, the control panel end unit 100 processes all these signals to generate the outlet closing command to the motor drive control unit 30. . Therefore, the hydraulic pumps 11 and 21 automatically operate in accordance with the control signal of the motor drive control unit 30 to generate hydraulic pressure. At this time, through the pressure detection sensor (17) (27) to detect the exit oil pressure of the hydraulic line according to the hydraulic pump (11) (21) or more.

On the other hand, if it is determined that the normal hydraulic pressure is generated by the pressure detection sensor (17) (27), the control and drive signals are generated to operate the pre-rotating solenoid valves (13) and (23) to advance the advance mud closure device. . At this time, the operation of the outlet filling pre / reverse solenoid valve 16 is received by receiving the detection signals of the standby position detection sensor 150 for detecting the standby position of the outlet mud closure device and the encoder 140 for detecting the turning angle. Will be judged.

That is, when the exit closing command signal is input, it is determined whether the current exit mud closure device is in the standby position, and when the exit exit closing command signal is in the standby position, the pre-rotation solenoid valve 13 is output by outputting a pre-rotation signal to the motor drive control unit 30. In operation, the mud closure device is rotated in advance to move the mud closure device to the position of the outlet. At this time, the encoder 140 detects the turning completion of the mud closure device, and when it is determined that the turning is completed, the rotation rotation is stopped.

After completion of the pre-rotation round, filling operation of the mud closure device is performed. That is, in the case of filling the outlet opening, the forward driving signal is outputted to the motor driving control unit 30 to the forward / backward solenoid valve 16 so that the filling forward operation is performed such that the mud, which is an irregular refractory, is closed in the melt discharge hole. . If the exit mud closure is retracted immediately after the filling is completed and the exit is closed, the mud that has been closed by the pressure inside the furnace is damaged, so that the mud closure is retracted after waiting for a predetermined firing time until the mud is fired. . That is, when the firing time elapses after the filling is completed, the filling backward solenoid valve 16 is operated so that the mud closure device fills and retracts to the position of the outlet.

After the filling retraction is completed, the turning retraction solenoid valve 13 is operated to output a control signal to the motor drive control unit 30 so as to retract to the original standby position. At this time, when the turning retreat completion is judged by the encoder 140 and the standby position detection sensor 150, the driving of the hydraulic motor is automatically stopped. In addition, in all the above-described operations, the signal generation and output generation signals are inputted to the input unit whenever they occur so that the monitor can check whether the abnormality occurs and appear on the display unit 130 through the process computer 110.

On the other hand, during the mud filling operation of the mud closure device, the hydraulic pressure detection to detect the case where the pressure in the hydraulic line drops below the pressure in the furnace due to the abnormal operation of the hydraulic pumps 11, 21 and the motor 10, 20 The detection signals of the sensors 17 and 27 are input. At this time, if the pressure of the hydraulic line is less than 300 bar as an example of the furnace pressure or the time required to complete the filling is determined as the result of the detection of the hydraulic detection sensors 17 and 27, the hydraulic motor and the pump may be It is determined that an operation abnormality is generated, and outputs a driving signal to the motor drive control unit 30 to stop the filling.

In addition, by closing the outlet valve 12 of the hydraulic line by outputting a drive signal to the valve drive control unit 170 so that the driving hydraulic pressure is not applied to the pre / reverse solenoid valve 16 from the hydraulic pump and the motor in which the abnormality occurs. (close) Furthermore, the other hydraulic motor (hydraulic motor in operation standby) 20 coupled to the same hydraulic tank 7 is driven so that normal hydraulic pressure is supplied to the pre / backward solenoid valve 16. Accordingly, the hydraulic motor 20 and the pump 21 which are normally operated from the hydraulic tank 7 by turning on the outlet valve 22 connected to the hydraulic line of the atmospheric hydraulic motor 20, opening the switching valve 40. The driving hydraulic pressure is supplied to the charging / returning solenoid valve 16 side of the mud closure device which is pre-rotated at the outlet so as to close the outlet through the switching valve 40.

At this time, the mud closure device by filling the mud, which is indefinite refractory by the re-drive of the solenoid valve 16 before and after the filling to close the exit port stably to prevent the leakage of the melt due to the abnormality of the original hydraulic line. do.

The outlet closing control device of the blast furnace according to the present invention is not limited to the above-described embodiment can be implemented by various modifications within the range allowed by the technical idea of the present invention.

As described above, in the outlet closing control device of the blast furnace according to the present invention, the hydraulic pump system always detects an abnormal occurrence of the hydraulic pressure cause of the corresponding hydraulic outlet during the exit closing process, and automatically operates the hydraulic pump waiting for the hydraulic system abnormality. By doing so, it is possible to prevent the exit closure failure and the failure of the exit closure device.

In addition, the exit gate closing instruction is generated instead of the gate opening by the driver's discretion, and the exit mud closure device automatically starts the pump and starts the sequential program instead of the manual manual step by step. By controlling the exit opening by the control, it is possible to secure driver safety and precise exit closing, and to prevent the failure of the opening closure and the failure of the exit closing device.

Claims (1)

The outlet of the blast furnace to close each outlet of the blast furnace completed by supplying the hydraulic pressure supplied from the hydraulic tank to the solenoid valve for turning forward / reverse and filling before / reverse through the hydraulic motor to control the operation of the closing control device. In the closing control device, A hydraulic outlet valve formed on a hydraulic line configured to supply / block hydraulic pressure from the hydraulic motor to the revolving forward / backward solenoid valve and the precharge / reverse solenoid valve respectively; A standby hydraulic motor connected to the hydraulic tank for supplying driving hydraulic pressure to the turning forward / reverse and filling before / reverse solenoid valves when an abnormality occurs in the hydraulic motor; A hydraulic pressure detection sensor for detecting whether a hydraulic abnormality is output from each of the hydraulic motors; A switching valve for shutting off the hydraulic line on the side of the hydraulic motor in which a malfunction occurs as a result of the detection of the hydraulic detection sensor, and switching the hydraulic line to supply driving hydraulic pressure from the hydraulic motor in normal operation to the corresponding forward / backward solenoid valve; , Determines the hydraulic motor in which the abnormality is received by receiving the detection result of the oil pressure detection sensor, and when the filling is in progress to drive the normal operating hydraulic motor to supply the hydraulic pressure to the switching before / reverse control valve and the switching valve and the oil A blast furnace closing control apparatus for a blast furnace, characterized by comprising a control panel end for controlling the driving of the extrusion side valve.