KR20040012073A - Method and Apparatus for Spray Nozzle Diagnosis - Google Patents

Abstract

PURPOSE: A system and a method for diagnosing secondary cooling spray nozzles of continuous casting machine are provided to realize realtime diagnose conditions of the spray nozzles in operation line by measuring injection quantity of the spray nozzles in the continuous casting process and comparing the measured values with a preset standard value. CONSTITUTION: In a system for diagnosing cooling water injection characteristics of spray nozzles installed on a continuous casting process line, the system for diagnosing secondary cooling spray nozzles of continuous casting machine comprises a plurality of resistance value measuring sensors(10) in which sensor heads are respectively inserted into both ends of water line pipe for supplying cooling water to the spray nozzles, and resistance values changed according to flux and flow rate of cooling water passing through the pipe are measured by the sensor heads; am MPU (microprocessor unit)(30) electrically connected to the resistance value measuring sensors(10) through wire lines to judge whether the respective spray nozzles are normal or not by comparing measured values transmitted from the resistance value measuring sensors(10) with a set standard value; and a main system(80) for displaying normal and abnormal signals of the respective spray nozzles transmitted from the MPU (microprocessor unit)(30) on a monitor.

Description

Diagnosis Apparatus and Method for Secondary Cooling Spray Nozzle of Continuous Casting Machine {Method and Apparatus for Spray Nozzle Diagnosis}

The present invention relates to a secondary cooling spray nozzle diagnostic apparatus and method of a continuous casting machine for diagnosing the state of secondary cooling water spray nozzles installed in a steel mill reprocessing process in a working line in real time. Secondary cooling spray nozzle diagnosis apparatus and method of the continuous casting machine for measuring the spray nozzle injection volume of the reverse in real time online to monitor the status of the secondary cooling spray nozzle mounted on the segment, which is a performance equipment, during operation. will be.

More specifically, in the continuous casting process of steel, the spray nozzle spray rate is measured in real time, and the spray nozzle condition is diagnosed by comparing with a preset reference value, so that the surface temperature during cooling, the purge inside the slab, the round shape of the slab surface The present invention relates to a secondary cooling spray nozzle diagnosis apparatus and method of a continuous casting machine that can contribute to stabilization of continuous casting operations and to improve slab quality by preventing occurrence.

In general, in the case of steel mills where the quality of equipment determines the quality of products, the management of accurate equipment is required. However, the secondary coolant spray nozzles installed in the existing steel mill processing process line indirectly checked the condition of the spray nozzles. Since it was impossible to identify with the naked eye, there was practically no way to accurately know the state of the nozzle.

In the continuous casting process of the steel, the slab in the semi-solidified state reaches the secondary cooling zone through the mold, whereby a certain amount of cooling water is injected from each spray nozzle. However, when the cooling water is not properly sprayed due to the sludge of the nozzle head, the amount of the nozzle, etc., the surface of the playing slab and the internal quality are greatly affected. The injection quantity and spraying angle, which are factors related to spraying the coolant of the spray nozzle, are very important factors for slab cooling. If the cooling state becomes unstable, cracks are generated on the surface of the slab, and a purge occurs inside, which causes problems in the quality of the rolling process. Will occur. Therefore, the cooling water must be uniformly distributed over all sections as an essential condition of the cooling zone.

On the other hand, in general, a pressure gauge, a flow meter, and the like were applied to measure the spray amount of the spray nozzle, but individual nozzles were not measured and accurate measurement was impossible due to poor operating environment.

Therefore, the secondary cooling mounted on the segment, which is a performance equipment, enables the smooth operation of the post process and the improvement of the operation quality by identifying and preventing the causes that may affect the surface quality and the internal quality of the currently produced slab. Accurate management of spray nozzle equipment is required.

Therefore, the present invention has been made to solve the above problems of the prior art, in the continuous casting process of steel to measure the spray amount of the spray nozzle in real time, and compare the state of the spray nozzle in real time in the operation line by comparing with the preset reference value Secondary cooling of continuous casting machine to contribute to stabilization of continuous casting operation and improvement of slab quality by preventing aging of equipment caused by clogging of nozzles, cracking of slab surface and purging inside during casting. An object of the present invention is to provide a spray nozzle diagnosis apparatus and method.

Figure 1a is an installation state of the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine according to the present invention.

Figure 1b is a block diagram showing a resistance measurement sensor in the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine according to the present invention.

Figure 1c is a side view of the state of use of the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine according to the present invention.

Figure 2 is a circuit diagram of a secondary cooling spray nozzle diagnostic apparatus of a continuous casting machine according to the present invention.

3 is a flow chart showing a secondary cooling spray nozzle diagnostic method of the continuous casting machine according to the present invention.

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

10 Resistance measurement sensor 10a, 10b Sensor head

11 Coolant Spray Nozzle 11 'Air Spray Nozzle

12 Water line piping 13 Sensor external connection line

14 Terminal connector 15 Roll

16 Slab 20 A / D Converter

30 MPU40 identification number

50 Power Supply 60 RF Transmitter

70 RF Receiver 80 Main System

In order to achieve the above object, the secondary cooling spray nozzle diagnosis apparatus of the continuous casting machine of the present invention includes sensor heads respectively inserted at opposite ends of the waterline pipe for supplying cooling water to the respective spray nozzles. A plurality of resistance value measuring sensors for measuring resistance values varying with flow rate and speed of the flowing coolant by the sensor head; An MPU electrically connected to the resistance measurement sensor through a wire line, and comparing and analyzing a measurement value transmitted from the resistance measurement sensor with a reference value to determine an abnormality of each spray nozzle; And a main system for displaying an abnormal signal of each spray nozzle transmitted from the MPU on a monitor.

In addition, the secondary cooling spray nozzle diagnostic method of the continuous casting machine, by measuring the resistance value that changes according to the flow rate and speed of the cooling water flowing through each waterline pipe by the sensor head of the resistance measurement sensor to diagnose each spray nozzle Collecting data necessary for; Converting the resistance value measured by the resistance value sensor into a voltage value to calculate the injection amount of the cooling water for each spray nozzle as the voltage value V; When the measured value is larger than the reference value, the spray nozzle is judged to be in a normal state when the measured value is larger than the reference value. If the measured value is smaller than the reference value, it is determined that there is an abnormality in the cooling water injection of the spray nozzle in the secondary cooling zone. Characterized in that it comprises a step.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figures 1a to 1c shows an embodiment of the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine according to the present invention, Figure 2 is a circuit configuration diagram of the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine according to the present invention Next, the components according to the above are as follows.

First, the resistance value measuring sensor 10 including the sensor heads 10a and 10b is installed on the waterline pipe 12 through which the coolant flows. 10a and 10b) are inserted and installed respectively. At this time, the design of the sensor is designed in a heat dissipation, waterproof structure and is based on the prevention of corrosion by moisture. In addition, the resistance measurement sensor 10 having the sensor heads 10a and 10b is installed on the upper part of the segment using a sensor external connection line 13 and an intermediate connection terminal 14 through a wire line pipe. Electrically connected to the controller box (Controller Box) (100).

The controller box 100 connects the A / D converter 20, the MPU 30, the unique number providing unit 40, the power supply unit 50, the RF transmitter 60, the RF receiver 70, and the main system 80. Although provided, the A / D converter 20 converts the resistance value measured by the sensor heads 10a and 10b into an analog signal to a digital signal.

The MPU 30 is electrically connected to the resistance measuring sensor 10 through a wire line, and compares the measured value transmitted from the resistance measuring sensor 10 with a set reference value to determine whether there is an abnormality in each spray nozzle 11. Judge.

The unique number assigning unit 40 assigns a unique number to each individual resistance value measuring sensor 10 and fixes it to the MPU 30 so that each individual spray nozzle 11 can be identified, and the power supply unit 50 ) Supplies power to the components for the circuit operation of the present invention. This is because there are so many installation places of the secondary cooling nozzles, each of them is given a unique number, so that the segment has a unique number when moving, so that the operator can quickly and accurately know the position of the spray nozzle in case of an abnormality.

The RF transmitter 60 wirelessly transmits an abnormality signal from the MPU 30 to the main system 80 wirelessly, and the RF receiver 70 receives a spray nozzle abnormality signal transmitted from the RF transmitter 60 to receive the main signal. To the system 80. The present invention is configured to be able to transmit data over the air because the signal connection terminals are very large when the segment is maintained.

The main system 80 displays an abnormal signal of each spray nozzle 11 transmitted from the MPU 30 on the monitor.

Referring to Figures 1a to 1c and 2 look at the operation of the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine according to the present invention.

First, when the coolant is supplied into the resistance measuring sensor 10 through the waterline pipe 12 when spraying the cooling water to the slab 16 through the spray nozzle 11, the resistance measuring sensor 10 A constant resistance value is formed in the sensor heads 10a and 10b provided at both ends of the. At this time, the resistance value sensed by the sensor heads 10a and 10b is changed according to the flow rate and speed of the coolant flowing through the resistance value measuring sensor 10. The resistance value measured in this way is transmitted to the controller box 100 through the sensor external connection line 13 and the intermediate connection terminal 14, and the analog signal is digitally converted by the A / D converter 20 of the controller box 100. Is converted into a signal.

Subsequently, the MPU 30, which has received the resistance value measured by the resistance value measuring sensor 10, converts the measured resistance value into a voltage value by an arithmetic program, thereby spraying the cooling water on each spray nozzle 11. Is calculated as the voltage value (V). This is because the resistance value R sensed by the sensor heads 10a and 10b is continuously changed according to the flow rate and speed of the coolant, and the current I supplied from the power supply unit 50 is always constant. The voltage value can be obtained according to the law.

(Equation 1)

V = I * R

In the formula, V is a voltage value, R is a resistance value, and I is a current value.

Thereafter, the MPU 30 compares the measured measured value with a set reference value to determine whether there is an abnormality of each spray nozzle 11, and the abnormality signal of each spray nozzle 11 is transmitted through the RF transmitter 60. When the wireless system transmits to the main system 80, the main system 80 receives an abnormal signal from the main unit 80 wirelessly through the RF receiver 70, and displays the abnormality of each spray nozzle 11 on the monitor of the main system 80. Displays in real time, allowing operators to accurately manage spray nozzle installations online.

3 is a flowchart illustrating a method for diagnosing a secondary cooling spray nozzle of a continuous casting machine according to the present invention.

First, the microprocessor unit (MPU) 30 transmits a resistance value that changes according to the flow rate and speed of the coolant flowing through each waterline pipe 12 to the sensor heads 10a and 10b of the resistance measurement sensor 10. By measuring by collecting the data necessary for diagnosis of each spray nozzle (S10).

Thereafter, the resistance value measured by the resistance measurement sensor 10 is converted into a voltage value to calculate the injection amount of the cooling water for each spray nozzle 11 as the voltage value V, and the calculated measured value is calculated. Compare with the set reference value (S11 to S12). At this time, the resistance R between the both ends of the sensor head (10a) (10b) is changed according to the flow rate and speed of the coolant and the current I supplied from the power supply unit 50 is constant so that it is continuously changed according to the law of Ohm (Equation 1) The voltage value can be obtained.

As such, the MPU 30 compares each other with the preset injection amount (set reference value) of the nozzle using the results calculated by the calculation program, but if the measured value is larger than the reference value, it is determined that the spray nozzle 11 is in a normal state, If the measured value is smaller than the reference value, it is determined that the spray nozzle 11 is in an abnormal state, and it is determined that there is an abnormality in spraying the cooling water of the spray nozzle 11 (S13 to S15). Thereafter, the MPU 30 feeds back to the initial state and repeatedly performs the operation of checking the abnormality of the spray nozzle 11 again.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the accompanying drawings and the detailed description of the specification.

As described above, according to the present invention, in the continuous casting process of steel, the spraying amount of the spray nozzle is measured in real time, and the deviation of the surface temperature generated during cooling by internally diagnosing the state of a plurality of spray nozzles in comparison with a preset reference value, inside the slab. It prevents fuzzy phenomenon, cracks and rounding phenomenon on the outside of the slab, and has an excellent effect of stabilizing continuous casting operation and improving slab quality.

Claims (4)

In the apparatus for diagnosing the cooling water spray characteristics of the spray nozzle installed in the processing line, Sensor heads 10a and 10b are inserted into opposite ends of the waterline pipe 12 for supplying cooling water to each spray nozzle 11, respectively, and the flow rate and speed of the cooling water flowing through the pipe 12 A plurality of resistance value measuring sensors (10) for measuring the resistance value which changes according to the sensor head; The MPU 30 is electrically connected to the resistance measuring sensor 10 through a wire line, and compares the measured value transmitted from the resistance measuring sensor with a reference value to determine whether there is an abnormality in each spray nozzle 11. ); And a main system (80) for displaying an abnormal signal of each spray nozzle (11) transmitted from the MPU (30) on a monitor. According to claim 1, When the abnormality signal of each spray nozzle 11 from the MPU (30) is transmitted to the main system 80, the abnormality signal from the MPU (30) to the RF transmitter 60 Wireless transmission through the main system 80, the main system in the secondary cooling spray nozzle diagnostic apparatus of the continuous casting machine, characterized in that the abnormal presence signal is applied wirelessly through the RF receiver (70). According to claim 1, A unique number assigned to each of the individual resistance value measuring sensor 10 and fixed to the MPU 30 so as to identify the position of each individual spray nozzle (11) 40 Secondary cooling spray nozzle diagnostic apparatus of a continuous casting machine characterized in that it comprises a). In the method for diagnosing the cooling water spray characteristics of the spray nozzles installed in the processing line, The resistance value that changes according to the flow rate and speed of the cooling water flowing through each waterline pipe 12 is measured by the sensor heads 10a and 10b of the resistance measuring sensor 10 to diagnose each spray nozzle. Collecting data; Converting the resistance value measured by the resistance value sensor 10 into a voltage value to calculate the injection amount of cooling water for each spray nozzle 11 as a voltage value V; When the measured value is larger than the reference value by comparing the calculated measured value with the preset reference value, the spray nozzle 11 is judged to be in a normal state, and when the measured value is smaller than the reference value, the coolant injection of the spray nozzle 11 of the secondary cooling zone is performed. Secondary cooling spray nozzle diagnostic method of the continuous casting machine comprising the step of determining that there is an error.