KR20040046753A - System for measuring sintered fine ore produced in blast furnace ore supplying system - Google Patents

Abstract

PURPOSE: A system for measuring an amount of a sintered fine ore in a vibrating screener is provided to exactly measure an input/output amount of material between processes by providing a system capable of intermittently measuring an amount of the sintered fine ore and managing data. CONSTITUTION: A system for measuring an amount of a sintered fine ore in a vibrating screener includes an A/D converter(64), an I/O processor(65), a belt conveyer(30), a display part(90), and an operation controlling unit(80). The A/D converter(64) converts a measured value of current into a digital signal. The I/O processor(65) sends the converted signal to a control PLC(70). The belt conveyer(30) conveys a sintered fine ore. The display part(90) stores and manages operation data for the sintered fine ore. The operation controlling unit(80) controls operations of components.

Description

System for measuring semi-light generation of blast furnace raw material particle sizer {SYSTEM FOR MEASURING SINTERED FINE ORE PRODUCED IN BLAST FURNACE ORE SUPPLYING SYSTEM}

The present invention relates to a semi-luminescence measuring system of the blast furnace raw material particle size separator, and more particularly, to a semi-light generation amount measuring system of the raw material particle size selector using the current change value of the drive motor when the semi-light selected by the particle size separator is transported to the belt conveyor.

1 is a schematic diagram showing a conventional general blast furnace raw material basis weight reservoir.

Sintered ore for use in the blast furnace process is discharged from the sintering machine and continuously stored in eight raw material storage tank (15). At this time, the storage means is in the tripper belt conveyor 10 to # 1 ~ # 8 storage tank to automatically check the amount according to the bin level (bin level) to be granulated.

The raw material is input into the particle size selector 20 from the reservoir 15 and continuously sorted on the upper screen mat and the lower screen mat. More than 12 mm of the raw material is used as a raw material in the blast furnace, but the graduation hole of the lower screen mat is used. Raw materials falling into the lower portion (hereinafter referred to as "semi-light") are loaded on the lower half-light transport belt conveyor 30 and sent back in the sintering process to undergo re-sintering.

Fig. 1a schematically shows a continuous wading device on the ON BELT according to the prior art, which is widely used by a general manufacturer to measure in real time the weight of continuous transport, which is the lower part of the belt conveyor 9 A load cell 5 is installed under the carrier roller 8 to convert the instrumentation signal into an electrical signal and measure the quantity.

However, the above conventional technology has the following problems.

That is, the weight is measured by the amount of movement of the cylinder (not shown) of the load cell 5, but this is a disturbing factor too much. First, since the tension and strength are uneven when the belt conveyor is replaced by repair and maintenance work. In order to measure the correct amount, it is a matter of maintainability that must be calibrated at all times. Second, the belt conveyor of steel mill continuously transports iron ore containing a large amount of dust dust, mist, etc. In many cases, it is a problem that rain is attached to the surface of the belt during rain, and it is difficult to accurately wade due to the water film phenomenon with the carrier roller.

Therefore, the present invention has been studied to solve the above-mentioned problems, the semi-reflected in real-time continuous in the particle size sorter used as the raw material of the blast furnace is discharged to measure the amount of semi-light intermittently when loaded on the semi-finished belt conveyor It aims to minimize the loss of opportunity during blast furnace operation by providing a system that enables trend management of data necessary for operation, and accurately measures the amount of incoming and outgoing raw materials.

1 is a schematic diagram showing a conventional general blast furnace raw material basis system;

1A is a schematic configuration diagram of a continuous wading device on an ON belt according to the prior art;

Figure 2 is a schematic diagram showing the semi-gwang processing flow discharged from the conventional particle size sorter,

3 is a block diagram of a semi-light generation amount measuring system according to the present invention;

4 is a graph showing the current change of the semi-light transport belt conveyor in the present invention;

5 is a graph showing a semi-overdose measurement schedule of the present invention.

Explanation of symbols on the main parts of the drawings

5: LOAD CELL 7: SINTERD FINE ORE

8: Carrier Roller 9: Belt Conveyor

10: raw material tanker tripper belt conveyor 15: raw material storage tank

19: Top granularity sorting network 20: Granularity sorting machine

26: weighing hopper 30: semi-light transport belt conveyor

31: semi-mineral storage tank 40: charged material transport belt conveyor

60: drive motor 61: MOSI CONTROL CENTER

63: current measuring controller 64: A / D converter

65: I / O processor 70: control PSI

80: operation controller 81: basis weight value setting unit

82: hopper basis signal setter 85: alarm device

86: alarm 90: display

In order to achieve the above object, the present invention provides a current measuring controller in a belt conveyor driving motor MCC (61) panel for transporting semi-glossy light, and converts the measured current value into a digital signal. D converter 64 and: I / O processor 65 for sending a signal from the converter to control PLC 70 and basis weight setter 81 for calculating the half light ratio of the particle size selector. Wow; A hopper basis weight start signal setter 82 for receiving an initial signal for measuring a current value of a driving motor for driving the half light quantity transport belt conveyor 30; The blast furnace raw material granularity is configured to include a display unit 90 capable of storing operation data on the measured semi-light quantity and trend management, and also including an operation controller 80 for performing all the above control and calculation functions. Provide a system for measuring semi-light emissions from sorters.

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

Figure 3 is a block diagram showing the overall life expectancy of the semi-light emission measurement system of the present invention.

A current measurement controller 63 capable of measuring three-phase current in real time is installed in a belt conveyor driving motor MCC (61) panel that transports semi-glossy, and the average of measured three-phase current values (4 A / D converter 64 for converting an analog signal of ˜20 mA) into a digital signal is provided.

The conversion signal is connected to an I / O (In Put Out Put) processor 65 for sending a control logic controller 70.

In addition, the operation controller 80 for performing all the above control and calculation functions is installed, and the basis weight value setter 81 for calculating the half light ratio from # 1 to # 8 of the particle size selector, respectively, Accept the signal.

In addition, the system of the present invention includes a hopper basis weight start signal setter 82 for receiving an initial signal for taring the current value of the drive motor for driving the semi-light quantity transport belt conveyor 30; It comprises a display unit 90 for storing the operation data on the amount of semi-light measured through the above process and trend management.

The semi-light transport belt conveyor 30 is electrically driven. At this time, the amount of semi-light to be transported is changed when the particle size selector is operated in two, three, or one, respectively, so that the three-phase current of the drive motor changes.

I.e. current = power / voltage

In the above relation, under a constant voltage condition, electric power, which is the amount of work, changes according to the amount of semi-light loaded on the belt conveyor during the unit time, and thus the current changes.

4 is a graph showing the current change of the transport belt conveyor according to the particle size selector semi-light emission of the present invention.

As shown in the graph, when the raw material basis weight of the particle size separator 20 is not made, only a no-load current flows and is kept constant, but changes frequently according to the basis weight of the particle size separator.

As shown in the graph of Fig. 4, it can be seen that the load current changes as the basis weight of the particle size selector generates a half luminous amount.

Therefore, when the electric signal before the particle size selector 20 starts to converge through the control PI 70, the three-phase current value is sampled under no load (belt idling) for about 7 to 10 seconds.

In order to receive the first signal for taring the current value of the drive motor driving the semi-light transport belt conveyor 30 to zero the gravimetric weight of the particle size selector, the hopper basis weight start signal setter 82 receives a signal. Send it through Pielci.

Therefore, if each current sampling number is "n",

Condition 1: Current at no load = n1 + n2 + n3 + n4 + n5 + n6 / 6 ......... Equation-①

When no current is detected twice at each phase,

Condition 2: Current under load = n1 ~ infinity / sample number

At the time of load, the detected current is detected several times for each phase.

Therefore, by subtracting the current value in the no-load current state from the current value in the load current state,

Expression-②-Expression-① = 00 (A) ............ Expression-③

You can get the current value you want,

To measure the actual amount of light generated, the value is multiplied by a constant (K = 35).

The K-value is to set the average value in consideration of environmental disturbance factors by discharging the actual quantity to the vehicle and making the data measured in the metering device.

The above-mentioned semi-light amount can be defined as "half light amount = equation-③ × K ... equation-④".

The A / D converter 64 for converting the average of the measured three-phase current values from the analog signal to the digital signal sends the converted signal value to the control PSI 70 through the I / O processor 65.

The basis value setter 81 for storing and processing the electrical control signal in the calculation controller 80 performing all the control and calculation functions, and calculating the half light ratio from # 1 to # 8 of the particle size selector 20, respectively. Connect to converge the operation signal.

For example, if # 1, # 2, and # 3 of the particle size selector 20 have 10 tons of raw material to be weighed, respectively, calculating 30TON ÷ Equation ④ to calculate the half light ratio (%) of semi-light operation data. This can facilitate the measurement of incoming and outgoing raw material inventory between the blast furnace process and the sintering process. The system of the present invention is also provided with a display unit 90 capable of storing and operating trend data on the amount of semi-light measured through the above process.

When the display unit 90 reaches the upper limit 10% line and the lower limit 4% line in the display unit 90, the control unit 80 is out of the management standard, so that the operation controller 80 may generate a half light ratio abnormality alarm so that an operator can perform on-site inspection. Alarm device 85 was connected to generate an alarm 86.

Therefore, the present invention as described above provides a system for measuring the semi-light amount in real time continuously in the particle size sorter of the sintered ore used as the raw material of the blast furnace, and the trend management of data necessary for operation, the input and output of raw materials between before and after process Accurately measuring quantities can greatly contribute to minimizing opportunity losses during blast furnace operations.

Claims (1)

As a system for real-time measurement of the amount of semi-light generated by the blast furnace particle size separator, An A / D converter (64) for installing a current measuring controller in the belt conveyor driving motor chassis (61) for transporting the semi-glossy, and converting the measured current value into a digital signal; An I / O processor (65) for sending a signal from the transducer to the control PI (70); A basis weight value setter 81 for calculating a half ratio of the particle size selector in the calculation controller 80; A hopper basis weight start signal setter 82 for receiving an initial signal for measuring a current value of a driving motor for driving the half light quantity transport belt conveyor 30; It comprises a display unit 90 for storing the operation data on the measured half light amount and trend management, characterized in that it comprises an operation controller 80 for performing all the above control and calculation functions Semi-light generation measurement system of blast furnace raw material particle size separator.